JPH061346B2 - How to detect edging - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a method for detecting an edge of edging, and in particular, when printing an original image film such as a negative film, the edge of the image (the boundary with the film base) is used. The present invention relates to a method for detecting efficiently and quickly.

[Conventional technology]

Conventionally, the cumulative transmission density (LATD) of the entire image of a color negative film (original film) is measured to correct the density, and slope control is performed to ensure that the density and color balance of all finished prints are the same as the negative density (exposure under exposure). , A color automatic photographic printing apparatus is known which prints so as to be the same regardless of proper exposure and overexposure. This automatic photographic printing apparatus comprises an optical system including a light source, a light control filter, a mirror box, a negative carrier, a lens, and a black shutter, which are arranged in this order.
Then, the original image film is placed on the negative carrier, the light source is turned on, the black shutter is opened, and the image of the original image film is imaged on the photographic paper through the lens for printing. The printed printing paper is developed by a developing process so that the print is automatically finished. In this automatic photographic printing apparatus, the original image transmitted light emitted from the light source is separated into three primary colors by the light receiving element into red light (R), green light (G) and blue light (B), and each of R, G and B colors is separated. To LATD (Large Area Transmittance
Density) is measured and the amount of printing light is determined based on the Evans principle, and slope control is performed to correct reciprocity law failure etc. to control print density and color balance.

Further, in the automatic photo printing apparatus, it is necessary to accurately position the pattern of the original film on the printing apparatus in order to properly print the pattern image of the original film on the printing paper. In order to perform this positioning automatically, conventionally, a notch is used in the previous process to punch a notch at the side edge of the original film, and this is detected by an optical sensor or the like for positioning. There is a drawback in that it is necessary to take accurate measures when the holes are drilled, which requires a great deal of labor. There is also a method of positioning the original image film by feeding it at a fixed distance all the time, but the accuracy is poor due to the accumulation of variations in the film feed from the camera and misalignment during film feeding during printing. In this case, there is a disadvantage that the position correction is frequently required and it is not suitable for automatic processing.

[Problems to be solved by the invention]

In order to solve these drawbacks, the present applicant obtains high resolution pixel information by interpolating pixel pitches even by using a two-dimensional image sensor for exposure control with relatively coarse pixel density, and thereby, it is possible to reduce the edge damage. We have already proposed a method for accurately detecting and automatically positioning the film pattern at the printing position. This method is to detect the output of a pixel row with a pitch relatively smaller than the pixel pitch of a two-dimensional image sensor, and to detect the edge by a statistical method based on the frequency distribution of interpolated variables. According to this method
When setting the negative film to be used for printing on the negative carrier, if the leading edge closest to the film edge is positioned in advance, the length and interval between the edges will be substantially constant thereafter. By conveying and detecting and positioning the edge of the next frame within a predetermined detection range, the negative film pattern can be automatically positioned without any practical problems, except for the positioning work of the leading frame. However, long strip negatives
In general, there is a leading edge to be printed at a position distant from the edge of the negative film, and when the edge of the leading edge is detected using the above method, the leading edge is also detected. In order to detect the edge accurately with a smaller pitch, it is necessary to continuously capture data from the leading edge of the negative film with a pixel smaller than the pixel pitch and perform arithmetic processing to detect the position of the edge. There is a problem that the range of precise position detection is wide and a large amount of data acquisition time and calculation time are required, so that the film cannot be conveyed at high speed, and efficient edge detection cannot be performed. Also, in the case of a short piece (piece) negative, the position of the leading edge is the same as that of the long negative (in the case of a piece negative cut including the leading portion of the long negative)
In some cases, the film edge may be close to the film edge, and in both cases, the edge detection method by the statistical method based on the previous edge position makes it difficult to automatically identify these negatives.
There is a problem. In addition, to avoid these problems,
Since the tip portion of the negative film has to be positioned manually, there is a problem that the efficiency is poor and both of them impede automation.

The present invention solves the above-mentioned problems and makes the above-mentioned positioning method proposed by the present applicant more practical and versatile, so that a long negative film and a short negative film can be used at the top. In order to enable efficient and automatic positioning even with respect to pits, the precision detection range of the edge position of the fine pitch film is narrowed relative to the preliminary detection, and it is transported at high speed before and after the precision detection range.
It is an object of the present invention to provide a method for detecting stinging edging capable of transporting a film at high speed as a whole.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention provides a film including one or more first light receiving element array groups and one or more second light receiving element array groups extending in a direction orthogonal to the film transport direction. When the films are conveyed in parallel with each other in the conveying direction and the fringes are detected, the presence of the fringes is preliminarily detected in the first light receiving element row group, and after the fringes are preliminarily detected, the second light receiving element row is detected. The group is characterized by precisely detecting the position of the ridge.

[Action]

According to the present invention, the presence of the gullet is preliminarily detected in the first light receiving element row group, and after the gullet is preliminarily detected, the position of the gullet is precisely detected in the second light receiving element row group. By thus preliminarily detecting the presence of the ginkgo fringes, the precision detection range of the gauze ridges can be limited to a small range, and the preliminary detection range, the first light-receiving element group and the second photodetector group can be detected until the preliminarily detected. The film can be conveyed at a high speed between the light receiving element group and the light receiving element group, that is, from the time when the presence of the edge is detected to the precise detection range and after the precise detection. As described above, in the present invention, since the position of the gaze is detected after the existence of the gage is preliminarily detected, the position of the gaze is always detected with a pitch smaller than the pixel pitch even when a sensor having a coarse pixel density is used. There is no need to perform detection, and it suffices to detect with a pitch smaller than the pixel pitch only within the limited precision detection range, and the detection time consisting of data acquisition time and calculation time can be shortened as a whole. Further, in the first light-receiving element array group, since the existence of a gaze, that is, whether the gaze is within a certain distance range is only detected, the pixel density may be coarse and the existence of a gaze is detected. Until that time, the film can be transported in a single pixel pitch, for example. If the resolution of the first light-receiving element array group is high, detection may be performed with a plurality of pixel pitches, and by doing so, the efficiency is further improved. On the other hand, in the second light receiving element row group, the position of the edge is detected with higher accuracy than in the first light receiving element row group. Therefore, when a sensor having a coarse pixel density is used, the pitch smaller than the single pixel pitch is used. Detect with. If the resolution of the second light receiving element array group is high, the detection may be performed with a single pixel pitch.

〔The invention's effect〕

As described above, according to the present invention, since the position of the gong edging is precisely detected after preliminarily detecting the existence of the gong edging and the position of the gage edging is predicted, the precision detection range of the gong edging is narrowly limited. The detection time can be shortened, so that the preliminary detection range, between the light-receiving element row groups, and after precise detection can be carried out relative to the precise detection of the position of the edge, until the presence of the edge is detected in advance. Because it can be transported at high speed,
As a whole, the effect that the film feeding can be efficiently speeded up is obtained. That is, the ratio of the pre-detection range for medium to high speed conveyance with single or multiple pixel pitch and the non-detection range for high speed conveyance without detecting edge is relatively smaller than the precision detection range for low speed conveyance with fine pixel pitch. Since it is expensive, the film feeding can be efficiently speeded up as a whole.

[Description of mode]

 The present invention can take the following aspects in carrying out the invention.

A first aspect is one in which the present invention is applied to the detection of the leading edge edge of a typical piece negative in which it is confirmed that the leading edge edge exists near the film edge,
In the preliminary detection, only the existence of film edges is confirmed. That is, the first mode is to detect the edge of the leading edge by detecting the presence of the film edge in the first light receiving element row group when detecting the edge of the leading edge of the piece negative that does not include the tip of the long negative. The presence of the edge of the leading edge is preliminarily detected, and after the presence of the edge of the leading edge is preliminarily detected, the position of the edge of the leading edge is precisely detected in the second light receiving element row group.

In the case of a piece negative obtained by cutting one long strip negative (strips strip negative) into a predetermined square unit (for example, 6 square units or 4 square units), except for the piece negative corresponding to the tip of the long negative (for this piece negative, The length from the normal film edge to the edge edge closest to this film edge (the edge edge edge) is about 1 mm and the length of the whole piece negative (because fogging has occurred and there is an aerial shot effect). Since the ratio to 152 mm (38 mm × 4) in the case of 4-gauge and 228 mm (38 mm × 6) in the case of 6-gauge is small, the position of the film-edge and the film-edge are most detected at the stage of pre-detecting the presence of the edge-edge. It can be considered that it is almost the same as the close-edged Etsu. Therefore, by detecting the presence of the film edging, it can be considered that the presence of the leading edging is preliminarily detected. Therefore, in this embodiment, after the presence of the film edge is preliminarily detected and the presence of the leading edge is detected, the high speed conveyance is performed to the position of the second light receiving element row group and the position of the leading edge edge in the second light receiving element row group. Is detected accurately. The presence of the film edge can be easily detected by determining whether or not the output of the first light receiving element array group has changed to the high density side by at least the film base density with reference to the non-film state. .

By thus preliminarily detecting the presence of the leading edge of the film from the presence of the film edge, for example, if the piece negative is inserted into the film transport apparatus while the film transport apparatus is driven, the presence of the film edge is detected. The presence of the leading edge edge is preliminarily detected by, and the position of the leading edge edge can be precisely detected by, for example, a predetermined method (pixel pitch interpolation or the like) to be described later, and the leading edge can be stopped at the predetermined position. , Can automatically position the leading edge closest to the piece negative film edge.

Therefore, according to this aspect, it is possible to speed up the transport of the film as a whole, and it is possible to automatically and efficiently position the leading edge closest to the film edge of the piece negative.
The effect is obtained.

The second aspect is substantially the same as the first aspect, but it is a further enhancement of the practicability of the first aspect. By performing the preliminary detection, the film edge and the leading edge edge are confirmed. The range of precision detection can be further limited. That is, in the second aspect, when the automation efficiency of the first aspect is further enhanced, within the predetermined distance range and the predetermined concentration range with the position where the output of the first light receiving element row group has changed to the high concentration side as a reference. By detecting whether the output of the first light receiving element array group has further changed to the higher concentration side, the presence of the leading edge edge is preliminarily detected, and after the presence of the leading edge edge is detected preliminarily. The position of the leading edge is precisely detected in the second light receiving element array group.

In the first aspect, in the case of a piece negative that does not include the tip portion of a long negative, the film edge is detected as being substantially equal to the edge of the leading edge at the stage of preliminarily detecting the presence of the edge of the leading edge. Although the leading edge edge is preliminarily detected by this method, in this embodiment, the output of the first light receiving element row group is at least the film base with reference to the non-film state in order to preliminarily detect the presence of the actual leading edge edge. A predetermined distance range based on the position changed to the high density side by the amount of the density (for example, the length from the film edge of the piece negative to the edge of the tip edge closest to this film edge (maximum distance of about 4 to 5 mm Time)) and within a predetermined concentration range, it is determined whether the output of the first light receiving element array group has changed to a higher concentration side. Are pre-detect the presence of. That is, in the case of a piece negative that does not include the tip of a long negative, the distance from the film edge to the edge of the leading edge is usually short, and the density of the edge image area is higher than that of the negative base area.
When the base portion is detected by the first light-receiving element row group, the output of the first light-receiving element row group changes to the high density side, and from this time, the image portion is detected within the predetermined distance range and the output is further predetermined. Changes to higher concentration within the concentration range. There is a case where the film is cut by cutting into the leading edge image and the film edge and the edge of the leading edge become equal, but in this case, the predetermined distance becomes zero. Therefore, by detecting whether or not the output of the first light receiving element array group has changed to the high density side within the predetermined distance range and the predetermined density range, the edge of the leading edge closest to the film edge can be detected. You can Then, similarly to the first aspect, the edge of the leading edge is precisely detected by the second light receiving element array group.

In this mode, since the actual leading edge of the edge is preliminarily detected, the leading edge of the edge is detected more reliably, the practicability is higher, and the overall detection time is shorter than in the first aspect. The effect of, is obtained.

With the above, the piece negative that does not include the tip of the long negative,
That is, the piece negative in which the fogging of the leading end portion of the film and the frequency of occurrence of aerial photography are low has been described. However, in general, the film pulled out from the cartridge at the time of shooting is loaded into the camera, so that the tip portion of the long negative or the piece negative including the tip portion of the long negative is completely exposed to external light and fogging occurs. ing. Further, as described above, the film edge and the edge edge may be cut in coincidence with each other even for a piece negative that does not include the tip portion of the long negative edge. Therefore, in the third aspect, the classification of the above-described film forms (strip negative, piece negative, etc.) is not performed manually, and the piece negative including the tip portion of the long negative, the long negative, and the tip portion of the long negative are not included. Piece negative (including piece negative in which film edge and edge edge are the same) Efficient and automatic detection of edge edge edge of all films makes the versatility and practicality extremely high.

That is, in the third mode, the presence of the leading edge is preliminarily detected by detecting the time when the output of the first light receiving element array group becomes a value between the film base density and the fog density, and the leading edge is detected. The second after the pre-detection of the presence of edging
The position of the leading edge is precisely detected by the light receiving element array group.

The film base portion is an unexposed portion and can be regarded as having substantially the same density for all negatives. In addition, the density of the fog portion is extremely high and is substantially uniform as compared with a normal overexposed exposure image, and generally, the low-density portion and the high-density portion do not coexist as in the case of exposure image information. Therefore,
The density of the image is a value between the density of the film base portion and the fog density, and the time when the output of the first light receiving element array group becomes a value between the film base density and the fog density is detected. As a result, it is possible to preliminarily detect the presence of the leading edge edging. The fog density and the general image density may be discriminated by using the contrast information and the lowest density information together. In this case, it is effective when the accumulation time of the image sensor described later is short (when the information on the ultra-high density side is saturated).

As described above, according to the third aspect, it is possible to automatically and efficiently position the edge of the leading edge closest to the film edge without manually classifying the film shapes. Therefore, the third
The aspect (1) has the highest versatility and practicality as compared with the first and second aspects.

And a 4th aspect is a 1st light receiving element row group and a 2nd.
Each of the light receiving element row groups of the above is used as a film edge or a leading edge by using at least one specific light receiving element row group extending in a direction orthogonal to the film transport direction of the two-dimensional image sensor for exposure control of the automatic photoprinting apparatus. The sensitivity is relatively lowered depending on the case where the exposure control image information is detected by the two-dimensional image sensor when the presence of the edge is detected.

The dynamic range of the two-dimensional image sensor is narrower than that of a normal photoelectric conversion element such as a photodiode or a photoelectric tube, and the negative image information is mainly present on the high density side of the negative film. Proposed JP 60
In the case of using the two-dimensional image sensor for photometric image information photometry in Japanese Patent Publication No. 154244, in order to effectively use the dynamic range, the image sensor dyna is adjusted so that the film base, which is the minimum density of the image, becomes zero as the reference density. For the exposure control or exposure correction to set the range and logarithmically convert the reciprocal of the image sensor output according to the following formula to compress the information on the low density side and expand the information on the high density side. Image information calculation processing is performed.

However, D is density and T is transmittance.

Therefore, when an attempt is made to detect a film edge or an edge of the leading edge using the two-dimensional image sensor for exposure control in which the dynamic range is set in this way, the information on the low density side near the film base is saturated. Since it is compressed, the resolution is poor, and it is more difficult to detect the film base density or less, that is, the presence or absence of film. For this reason,
In this aspect, when the presence of a film edge or a leading edge is detected using the two-dimensional image sensor for exposure control, the sensitivity is relatively higher than that when the image information for exposure control is detected by the two-dimensional image sensor. Is trying to lower. The sensitivity can be reduced by reducing the amount of light from the light source or shortening the storage time of the two-dimensional image sensor and switching the sensitivity of the two-dimensional image sensor. By changing the sensitivity in this way and setting the dynamic range so that the reference density becomes zero when the light source is turned on without a film, for example, the information on the low density side will not be saturated. , It becomes easy to detect the presence of film edge or leading edge edge. When detecting a film edge or a leading edge, image information corresponding to the low density side near the film base density is important. For example, an A / D (analog-digital) converted image sensor output is used. (Corresponding to the transmittance) may be used as it is to detect the presence of a film edge or the like, or the corresponding look-up table may be switched to convert it into a density value. In the following embodiments, an example using the lookup table is explained.

According to this aspect, since the two-dimensional image sensor that detects the image information for exposure control is used for edge detection, it is not necessary to add a sensor for edge detection, the sensor mounting space can be saved, and the sensor cost can be reduced. Can be reduced. Further, shortening the accumulation time can reduce unnecessary signals such as blooming and smear peculiar to the image sensor, thereby improving the edge detection accuracy. Furthermore, since the accumulation time of the sensor can be reduced, the detection time can be shortened and the overall processing time can be shortened.

〔Example〕

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a view showing the schematic arrangement of the printing optical system of the automatic photographic printing apparatus used in the present invention. Film transport device 10
Is a film transport device for transporting a developed original image film 18 such as a negative film to a predetermined printing position 17 on a film support base (negative carrier) 15. Below the printing position 17, there is a printing light source 19, and between the film 18 and the light source 19 is a dimming filter 27 composed of yellow (Y), magenta (M) and cyan (C) complementary color filters. It is arranged. A portion of the film support base 15 corresponding to the film photographing area is open or transparent. A long photographic printing paper 33 is arranged above the film 18 via a printing lens 29 and a shutter 31. 33A is a supply roll for the photographic printing paper 33, and 33B is a take-up roll. LS is the optical axis of printing.

A predetermined angle is formed with the optical axis LS so as not to interfere with the printing on the printing paper 33, and the printing position 1 is provided near the printing position 17.
An image information detecting device 35 for obtaining the density distribution of the film 18 in No. 7 is arranged. This image information detection device 3
Reference numeral 5 denotes a two-dimensional image sensor 37 formed of a storage photoelectric conversion element such as a CCD type or a MOS type, and a lens 39 for forming a film image at the printing position 17 on the image sensor 37.
And a circuit 41 for electronically processing the output of the image sensor 37 to form a light amount signal from the printing position 17. The image sensor 37 receives the original image transmitted light of the negative film 18 located at the printing position 17 through a lens system 39,
The light amount information from the printing position 17 is divided into a number of aligned pixels and output. The circuit 41 is connected to the CPU 43,
The CPU 43 is connected to the pulse motor of the film transport device 10 so as to control the transport speed.

The original film 18 is sequentially transferred by the film transport device 10,
The film is conveyed to the printing position 17, but the film transfer device 10
Is configured as follows.

[Film transport device]

As shown in FIGS. 3 and 4, upstream and downstream of the optical axis LS are arranged so as to correspond to the back surface (lower surface) of the negative film on which the transport rollers 22 and 24 are transported. The transport rollers 22 and 24 are fixed to the rotary shafts 26 and 28, respectively, and are arranged in a direction perpendicular to the film transport path A when seen in a plan view.

A pulley 38 is fixed to the conveying roller 22 and a pulley 40 is fixed to the conveying roller 24, and a timing belt 42 is stretched between the pulleys 38 and 40. As a result, the rotary shafts 26, 28 are rotated in the same rotational direction and at the same rotational speed when viewed in the axial direction.

A pulley 44 is fixed between the pulley 40 and the conveying roller 24, and a part of the timing belt 46 is wound around the pulley 44. The other part of the timing belt 46 is wound around a pulley 48, and the pulley 48 is connected to the CPU 4
Pulse motor 50 whose number of drive pulses is controlled by 3
Is connected to the output shaft 52. Therefore, the pulse motor 50 transmits the rotational force to the rotary shafts 26 and 28 via the timing belts 46 and 42, rotates the transport rollers 22 and 24 in the clockwise direction in FIG. 4, and transfers them to the negative film on the film transport path A. It is designed to give a carrying force.

As shown in FIG. 3, a lower mask 64 is mounted below the film transport path A. A first mask opening 62 and a second mask opening 70 pass through the lower mask 64, respectively.

Further, the large arm 14 has a pair of press rollers 114, 1
16 is attached, and the negative film is sandwiched between the conveying rollers 22 and 24, respectively, and the negative film can be conveyed when the conveying rollers 22 and 24 rotate. A mask base 136 is fixed to the tip of the small arm 16. An opening 137 larger than the mask opening 140 is formed in the mask base 136 and the upper mask 1
38 is attached.

[Sensitivity switching of image sensor]

When the film 18 is fed through the transport path A, the average (or integrated) output from the plurality of light receiving elements selected according to the negative size from the pixel array of the image sensor 37 in the direction orthogonal to the film transport direction. That is, the exact value is the fifth
As shown in the figure. FIG. 5A is a plan view of the film 18, and FIG. 5B shows the dynamic range by operating the image sensor 37 with low photosensitivity.
It is the output when R is set, and (C) is the output when the dynamic range is set to FDR in FIG. 8 by operating with high photosensitivity. As can be seen from FIG. 5B, when the image sensor is operated with low sensitivity, for example, when the brightness of the light source in the absence of the film is set to the reference density of zero, the high density side, that is, Although the sensor output in the image area is saturated, on the low-concentration side, the output changes greatly at the film edges and edge areas, and from this change, the presence of the film edge and the edge area and the position of the edge area are detected. Can be detected. On the other hand, as can be seen from FIG. 5 (C), when the image sensor is operated with high sensitivity, that is, when the film base density is set to the reference density of zero, the image information on the high density side is obtained accurately. However, the sensor output is saturated on the low concentration side. Therefore, it is difficult to detect the film edge when the image sensor is operated with high sensitivity. Further, as can be understood from FIG. 5 (C), it is possible to detect a gaze edge even if the image sensor is operated with high sensitivity for a particular gaze image, but it is generally difficult to detect a gage edge. For negative images of underexposed negative films and negative films with a large distribution ratio in the low density area, the density is about the same as that of the film base, so when the image sensor is operated with high sensitivity, the black edges are detected. It is difficult because it is difficult. The high sensitivity switching of the image sensor 37 is performed as follows.

First, a case where the sensitivity is switched by changing the accumulation time of the image sensor will be described. FIG. 6 shows the details of the image sensor 37 in the alternate long and short dash line together with the details of the circuit 41 shown in FIG. Image sensor 37
Is a light source conversion / accumulation unit 211 that receives light from an image or the like to perform photoelectric conversion and charge accumulation, and a holding unit 212 that transfers and retains the charges accumulated in the photoelectric conversion / accumulation unit 211. , And a read register 213 that outputs the electric charge held in the holding section 212 as an analog image signal PS. Further, the pulse oscillator 201 oscillates a basic clock 4fcp having a predetermined frequency (for example, 6 MHz), and the basic clock 4fcp is driven by the driving timing unit 2.
02 and the CPU 203 to input the image sensor 3
Clock signal CK for driving 7 (ΦI, ΦS, Φ
R), a signal indicating the operating state of the image sensor 37, that is, an image signal SP corresponding to one pixel of the image sensor 37, a horizontal synchronizing signal Hsync corresponding to scanning of one line of the image sensor 37, and an image. Vertical sync signal Vs corresponding to scanning of one screen of the sensor 37
ync and are generated and output. The clock signal CK input to the image sensor 37 is supplied to the photoelectric conversion / accumulation unit 211.
Driving four phase signals ΦI (ΦI1 to ΦI)
4), for example, four-phase phase signals ΦS (ΦS1 to ΦS4) that drive the holding unit 212, and four-phase phase signals ΦR (ΦR1 to ΦR4) that drive the read register 213, respectively. It has the same frequency (for example, 1.5 MHz) obtained by dividing the basic clock signal 4 fcp, but each phase signal (ΦI1 to ΦI4, ΦS1 to ΦS4, ΦR
1 to ΦR4) are all out of phase with a predetermined relationship. The image signal PS read from the image sensor 37 is supplied to the A / D converter 221 in the arithmetic processing unit 200.
Is converted into a digital true value PSD, and the reciprocal of the transmittance of the true value PSD is logarithmically converted by a logarithmic table circuit (ructup table) 224 to be converted into a digital density value DS and stored in the memory 223. Has become. Further, the arithmetic processing unit 200 includes an image signal SP from the driving timing unit 202 and a horizontal synchronization signal Hsy.
nc and the vertical synchronizing signal Vsync are input, and arithmetic processing according to the operating state of the image sensor 37 is performed.

Further, the phase signal ΦI (ΦI1 to ΦI4) output from the driving timing unit 202 is applied to the photoelectric conversion / accumulation unit 211 of the image sensor 37 through the gate circuit 204, and the gate circuit 204 controls the control signal CS from the CPU 203. It is controlled by. Also, CPU
Reference numeral 203 is connected to the arithmetic processing unit 200, and includes an image signal SP, a horizontal synchronizing signal Hsync, and a vertical synchronizing signal Vsy.
Based on nc, the operating state of the image sensor 37 can be grasped and the image information can be processed. Therefore, the CPU 203 can output the vertical synchronizing signal Vsync from the driving timing unit 202, that is, the control signal CS in synchronization with the scanning of one screen. Furthermore, CPU
Logarithmic table circuit 2 in arithmetic processing unit 200 from 203
A selection signal SL corresponding to the control signal CS is input in the 24.

The contents of the logarithmic lookup table in the logarithmic table circuit 224 composed of a ROM (Reed Only Memory) or the like will now be described. The relationship between the true value Y and the density value X is as shown in FIG. , For example, A / D converter 221
Output is 8 bits (0 to 225) and the density resolution is 0.
When the value is 01, the density is 0.00 to 0.77 in Table ^# 0.
Is the effective area of density resolution 0.01, in Table ^# 5 the density of 0.51 to 1.32 is the effective area of density resolution 0.01, and in Table ^# 10 the density is 1.03 to 1.03. The range of 1.92 is the area of density resolution 0.01. Therefore, if a required number of such tables (tables corresponding to the dynamic ranges R1 and R2 in FIG. 8) are prepared, the dynamic range is hardly affected by noise components such as dark current and offset. By switching, it is possible to convert to the accurate and high resolution density value X. That is, the dotted line portion of FIG. 7 is extremely poor resolution compared to solid line, but can not compensate for accuracy particularly when digital processing, for example, a table ^# 0
When the solid line portions of ^# 5 and ^# 5 are appropriately selected, even if the dynamic range of the image sensor is D = 1.0 (10: 1) or less, the range of the density value D = 0.01 to 1.32 is 0.
You can read it with 01.

Incidentally, FIG. 8 shows a typical relationship between the dynamic range FDR required for a high-density image (a high-density image portion) and the dynamic range CDR required for the detection of a film edge or an edge edge. By changing the range R1 to the range R2, and by changing the setting of the dynamic range of the image sensor, the dynamic range is comprehensively increased, and the image information having a density higher than the film base density and the film image average density are obtained. It shows that it is possible to switch and detect image information having a density lower than that in the vicinity, as needed. When the dynamic range is set to CDR, the degree of reduction is as shown in FIG. 5 (B), and the dynamic range is set to F.
When set to DR, the sensitivity becomes high as shown in FIG. 5 (C).

In such a configuration, the basic clock signal 4fcp from the pulse oscillator 201 is input to the driving timing unit 202, and the clock signal CK, the image signal SP, the horizontal synchronizing signal Hsync, and the vertical synchronizing signal Vsy are input as described above.
, and the phase signals ΦS and ΦR of the clock signal CK are directly applied to the holding unit 212 and the read register 213 of the image sensor 37, respectively.
The phase signal ΦI is applied to the photoelectric conversion / accumulation unit 211 via the gate circuit 204. The image signal PS from the image sensor 37 is input to and processed by the arithmetic processing unit 200 in exactly the same manner as described above. Here, the CPU 203 determines the operating state of the image sensor 10, that is, the cycle mode of photoelectric conversion / accumulation, transfer, holding and reading through the arithmetic processing unit 200, and switches the control signal CS to control the gate circuit 204. This is because the status signal (SP, Hsync,
It is also possible to directly input Vsync). In this way, the CPU 203 causes the image sensor 10
When the photoelectric conversion / accumulation mode is detected and the gate circuit 204 is switched by the control signal CS, the phase signals ΦI1 to ΦI4 from the gate circuit 204 are logic “L” or “H”.
For example, ΦI1 = "L", ΦI2 = ""
L ″, ΦI3 = “H”, and ΦI4 = “H” are fixed and provided to the photoelectric conversion / accumulation unit 211. In this case, the phase signals ΦS and ΦR are input to the read register 213 in the holding unit 212, respectively. If the fixed operation time of the phase signals ΦI1 to ΦI4 from the gate circuit 204 by the control signal CS is performed in synchronization with the vertical synchronization signal Vsync output corresponding to one screen scan, it is shown in FIG. In this example, only the photoelectric conversion / accumulation mode is repeated multiple times (in this example, 2
It can be repeated only once). That is, when the image sensor 37 enters the photoelectric conversion / accumulation mode, C
When the PU 203 makes a determination (time point t1), the CPU 203 gives the control signal CS to the gate circuit 204 to output the phase signal ΦI.
1 to ΦI4 are fixed to a predetermined combination of logic levels, and photoelectric conversion / accumulation is performed. When photoelectric conversion / accumulation is performed plural times in synchronization with the vertical synchronization signal Vsync, CP
U203 eliminates the control signal CS to remove the gate circuit 204.
Are restored (time point t3), and the phase signal ΦI from the driving timing unit 202 is directly applied to the photoelectric conversion / accumulation unit 211. As a result, the image sensor 10 is at time t3.
From the time t4, the accumulated charge is transferred, held, and read out from and the next vertical synchronization signal Vsync is input.
To the next operation.

In this device, the CPU 203 selects and uses the logarithmic table in the logarithmic table circuit 224 by the selection signal SL according to the control of the gate circuit 204 by the control signal CS.

First, a method of setting the above logarithmic table will be described.
Here, the logarithm is a common logarithm whose base is "10", the basic storage time of the image sensor 37 is TB, the photometric storage time is TX, and the scanning (hereinafter referred to as the main scan) for photometry using the logarithmic table is performed. The A / D converted value (exact value) is Y, the photometric density value from the logarithmic table circuit 224 is X, the photometric luminance value is P, the accumulation time coefficient is a, the logarithmic table number is Tn, the density coefficient is K, and the logarithmic table N (number) (page), maximum logarithmic conversion table using the logarithm conversion table.
The conversion value is YP, the A / D reference value of the base luminance is PB, and the requested dynamic range is D. Since the dynamic range is D and the number of logarithmic tables is Tn, the accumulation time coefficient a is Is defined as

The basic accumulation time TB is set before the photometry of the original image film, usually during the operation of the calibration for detecting the calibration data with the reference film. At the time of detecting image information, the standard film base is set to zero and the resolution of the image information is increased so that the base luminance PB is measured first.
It should be noted that the brightness of the light source when the negative film does not exist may be set to the reference density of zero when the edge detection is performed.
At this time, for the true number saturated output M of the A / D converter 221,
In order that the A / D converted value with a slight margin becomes (M-α), the accumulation time is sequentially extended from the minimum accumulation time in which the image information can be formed by the image sensor 37 to obtain the base brightness PB. Select the corresponding basic accumulation time TB.

Next, if necessary, the photometric accumulation time TX is set by the press key, and the A / D converter 221 obtained by photometric measurement at the basic accumulation time TB using the exact number table for the original image film to be photometrically measured. The photometric accumulation time TX is determined by n determined in the pre-scan table, using the maximum luminance value YP of the true output Y of as the address information. That is, ^{TX = TB · a n ··· (} 2). (2) In photometry by the basic accumulation time TB determined A / D conversion value YP is represented by YP / PB / ^{a n,} when this equation to logarithmic ^{conversion, logYP = log (PB / a} n) logYP = LogPB−n · loga (3), n · loga = logPB−logYP (4), and n = (logPB−logYP) / loga. ． ． (5) It should be noted that n is calculated by rounding down the decimal places. Therefore, the multiple table number n selected by the pre-scan table memory obtained by the above equation (5) is determined by using the A / D converted maximum luminance value YP during pre-scan as address information.

On the other hand, assuming that the photometric brightness value is P, the A / D conversion value Y at the time of this scan is Y = P × a ⁿ (6), and the photometric density value X is the common logarithm of the reciprocal of the photoluminance ratio. Therefore, the AD reference value PB of the base brightness and the photometric brightness value P
Is defined as X = K · logPB / P (7). Since the equation (6) is converted to P = Y / a ⁿ , the above equation (7) can be substituted into the following equation: X = K · log (PB / Y / a ⁿ ) = K · log (PB · a ⁿ / Y) = K · log ( Y / PB · a n) -1 = -K [logY-logPB-n · loga] = K [logPB-logY + n · loga] (8) is obtained, X = K · logPB + n · K · loga −K · logY (9) Therefore, the density photometric value X selected by the logarithmic table memory obtained from the above equation (9) is determined by using the logarithmic table number n determined at the time of prescan and the A / D converted value Y at the time of this scanning as the address information. .

From the above, the configuration of the logarithmic table circuit 224 is as shown in FIG. 10, and the logarithmic table ^# 2 is ^# 0 to ^# 28.
Nine are prepared, and a pre-scan table 241 and an antilogarithm table 242 for outputting input and output in a one-to-one manner are prepared. For 8-bit processing, the address is 0 to 255
The photometric data is also in the range of 0 to 255, and the pre-scan table 221 selects the table number n by n = (log250-logYP) /1.269 (10). In this case, if the requested dynamic range D is set to 1: 1000, the accumulation time coefficient a is calculated from the equation (1). And the above equation (10) is obtained. Also, log table ^# 0
Each ^# to ^# 28 is composed of 256 bytes, and the density value X is obtained by X = 100.log250 + n.100.log (1.269) -100.logY (11), and the density value X is calculated in each logarithmic table ^# It is read at the corresponding addresses 0 to 255 of 0 to ^# 28. In this case, when the density value D = 0.01 corresponds to “1” of the A / D conversion value, K = 1 / 0.01 = 100, and the density coefficient K has a required resolution and a dynamic range. Make a decision on the balance. In the case of 8-bit processing, the density value X is "2".
It is clipped at 25 ", and the part after the decimal point is discarded. When Y = 0, Y = 255 is set.

The logarithmic table set in the logarithmic table circuit 224 as described above is selected by the selection signal S from the CPU 203.
Select by L. Therefore, the image signal PS from the image sensor 37 is converted into the logarithmic table density value X corresponding to the accumulation time.

In this way, the image information PS from the image sensor 10 changes the charge accumulation time, and the conversion table corresponding to the output signal is switched according to the set number of times, so that, for example, a high density image as shown in FIG. 8 is obtained. The required dynamic range FDR and the required dynamic range CDR for the low density image are selected. When detecting an edge, it is sufficient to know the relative displacement amount rather than the absolute value of the light amount. Therefore, in practice, if the accumulation time is about 1/2 of the accumulation time when detecting negative image information. Alternatively, the accumulation time based on the brightness of the light source when the negative film does not exist may be determined by about 50% of the accumulation time based on the base density.

Next, a method of adjusting the amount of light from the light source to adjust the sensitivity of the image sensor will be described.

The accumulation time of the image sensor 37 for photoelectric conversion is set to a predetermined value, the light amount per unit area (for example, per pixel) received by the image sensor 37 is measured, and the measured value is detected. It is determined whether or not it is within a predetermined range determined in advance according to the power density. If the measured value is not within the predetermined range, the amount of light of the dimming filter 27 inserted in the optical path is adjusted to adjust the amount of light, or the power supplied to the printing light source 19 is adjusted. In addition,
When adjusting the light amount, the insertion amount of the ND filter may be changed or the diaphragm provided on the front surface of the image sensor may be adjusted. Then, the amount of light per unit area is measured again, and the adjustment of the dimming filter 27 or the adjustment of the power supply is repeated so that the amount of light per pixel of the image sensor is within a predetermined range. Using this adjustment method, when detecting film edge or edge, the light intensity is reduced and the sensitivity of the image sensor is reduced compared to when detecting density information of the edge image, and the density information of the edge image is reduced. When detecting, the amount of light is increased and the sensitivity of the image sensor is made higher than in the above case so that the image sensor output changes as shown in FIGS. 5 (B) and 5 (C). The edge information can be detected and the image information can be detected. In addition,
Power consumption can be reduced by controlling the amount of light emitted from the light source instead of controlling the light control filter or the like.

Since the dynamic range of the image sensor 28 is generally narrow, the density signal of the film base (non-photographing area), which is the lowest photographing density area of the film, is the lowest (photoelectric conversion) when it is desired to obtain detailed density information of the film photographing area. The sensitivity is set so that the maximum element output is at or near the saturation value). Therefore, as can be understood from FIG. 5C, the output on the low concentration side is saturated, Normally, it is not possible to distinguish between the non-film part and the film base part. Therefore, in order to distinguish between the film-free portion and the film base portion (that is, to detect the film edge), the photosensitivity must be reduced by shortening the charge accumulation time as described above. When the sensitivity of the image sensor 37 is lowered, its output becomes as shown in FIG. 5 (B). In this state,
Since the output on the high density side is saturated, the difference in the density distribution information between the film non-shooting area (base part) and the shooting area becomes small, making it difficult to accurately detect the density distribution information on the shooting area. Therefore, the sensor output changes greatly, so that it is easy to detect the film edge and the edge edge. A high-concentration edible edema can have a large detection ratio (existence or non-existence of edging).

[Arrangement of light-receiving element group]

For the detection of film edge and edge edge,
As can be seen from FIG. 3B, the density changes remarkably in the film transport direction when the film is not present, when the film is present, or when the filmed area and the non-imaged area of the film are significantly different in density. You should pay attention to. Practically, in order to detect the border edge between the photographing area and the non-photographing area, that is, the edge edge, at the center of the printing position, in this embodiment, as shown in FIG. The line edge is detected by the output of one or more rows of the light receiving element regions 170 on the side where the film enters on the line orthogonal to the film transport direction on the surface of the three-dimensional image sensor 37. To detect the leading edge, the first light receiving element region 170 and the second light receiving element region 1 are preliminarily detected after the leading edge is detected.
After a high speed conveyance for a distance a little shorter than the distance from 72 (from the first light receiving element area to immediately before the second light receiving element area),
The film transport is slowed down, and the light receiving element output of one row or two or more rows of the light receiving element row 172 that is located downstream of the light receiving element area 170 and is parallel to the area 170 (preferably detecting the central portion of the printing position), The edge of the leading edge is precisely detected at the center of the printing position. FIG. 11A shows the printing position 17 (that is, the mask opening 140 of the upper mask 138).
FIG. 11 (B) shows a state of film transport in FIG.
Indicates the light receiving element surface of the corresponding image sensor 37.

Each of the light receiving element regions 170 and 172 outputs several light receiving elements corresponding to the negative film size image width of the light receiving element array including at least one light receiving element array extending in the direction orthogonal to the film transport direction. To eliminate the partial density difference of the film. For edge detection, it is only necessary to be able to measure the density difference near the density of the film base, so multiple sensor outputs corresponding to the image width of the negative film size in the direction orthogonal to the film transport direction are integrated or averaged, and the edge judgment operation is calculated. I do. The calculation of the sensor output corresponding to such a negative size can be easily performed by using a microcomputer.

That is, in the case of automatically controlling the conveyance of the exposure image, the exposure size of the negative film 18 is known by measurement or data input, and therefore, the detection area of the image information and the light receiving element array group are determined by the exposure size in FIG. Switch and use as in 1). When all the pixels of the image sensor 37 are composed of j columns (1 to 40) and i rows (1 to 30), for example, in the 135F size, the area F2 is used, and 11
The area F1 is used for 0 size. Then, the measured value of the pixel S _ij of the image sensor 37 is set to TS _ij, and j _{n of} the jth column
Find the exact value of the th sampling point. In the case of the 135F size, the average value T has 23-7 = 16 pixels, Becomes When detecting the negative film 18 with the minimum pitch, the true value THS _135F of 135F size of each adjacent sampling point is Similarly, in the case of 110 size, the average value T
Since the number of pixels is 19-11 = 8, Becomes When the negative film 18 is detected by a minute pitch, the 110-valued true value THS ₁₁₀ of each adjacent sampling point is Required by. When the measured values thus obtained are sampled and the frequency distribution is obtained, an exact numerical value curve PC as shown in FIG. 17 is obtained.

If the above operation is performed so that the storage time of the exposure control two-dimensional image sensor 37 is shortened or the light amount is lowered to lower the photosensitivity so that the output shown in FIG. It can detect edges or edges.

[Edge detection]

FIG. 1 shows a flow chart of a routine of an embodiment of the edge detecting method according to the present embodiment. However, since this edge detecting method is mainly used as a means for positioning the photographing pattern at the printing position, it is a subroutine in the control system incorporated in the printing apparatus. This routine is an application of the third and fourth aspects described above.

First, a mask having a size corresponding to the size of the negative film 18 to be printed is loaded at a predetermined position 17 of the printing section, and in step S1, the size of the mask opening of the film transporting device 10 is adjusted by the image sensor 37, for example, as disclosed in Japanese Unexamined Patent Publication. 60-1
The size of the negative film is measured by measuring as No. 51626. The size measurement may be visually input. Negative film 18 according to this size measurement
The amount of conveyance is set, the light receiving element array is automatically selected and extracted, and the printing exposure amount and its correction amount are controlled.

In the next step S2, the accumulation time of the image sensor is shortened by the above-described method so that the image information having a density lower than the film base density can be obtained (for example, a half of that in the case of detecting the image information in the vertical direction). Accumulation time),
In step S3, the pulse motor 50 of the film transporting device is controlled so that the film can be transported at medium to high speed by detecting a single pixel pitch (for example, about 1 mm pitch), and the film is fed while the transport roller is rotated by the pulse motor 50. The film is inserted into the transport device and the transport of the film is started. At step S4, the light receiving element array group output of the light receiving element region 170 is taken in, and at step S5, the output L of the light receiving element array group is between the value L _B corresponding to the film base density and the value L _O corresponding to the fog density. Value (L _O <L <
By detecting whether or not it has become L _B ), the edge of the edge closest to the film edge (leading edge) is preliminarily detected.

When the determination in step S5 is negative, the medium to high speed conveyance of the film is continued and the output is continuously taken.

Here, in the case of a piece negative that does not include the tip portion of the long negative, as well as in the case of a long negative or a normal piece negative in which fogging occurs near the tip of the film, as described above, Since the output of the light receiving element array group becomes a predetermined value in a part, by judging whether the output of the light receiving element array group has become a value within a predetermined range, it is not affected by fog near the leading edge of the film. It is possible to preliminarily detect the leading edge edging. In this case, the accumulation time may be lengthened once to detect the high-density side so that it can be easily distinguished from the fog portion. Step S
If it is determined in 5 that the leading edge is preliminarily detected, the film is conveyed at a high speed by a length corresponding to the interval from the detection position of the light receiving element region 170 to immediately before the light receiving element region 172 in step S7. After the leading edge is conveyed to a position where it can be precisely detected by the light receiving element array group in the light receiving element region 172, in step S8 the pulse motor 5
By controlling 0, the film is conveyed at a low speed by detecting a minute pitch smaller than a single pixel pitch (for example, about 0.1 mm pitch). At the next step S9, the film is conveyed by the fine pitch, and the leading edge is precisely measured at the portion E shown in FIG. 13, and at step S10, the leading edge of the film is received by the light receiving element area 172. It is determined whether or not it is detected by the element array group.

When an image sensor having a coarse resolution, which is generally used for exposure control, exposure correction, or the like, is used when performing accurate edge detection, the pixel pitch interpolation described below is performed. Note that, for the sake of convenience of description, detection of a gaze edge other than the leading edge will be described below, but the same applies to the leading edge. In this pixel pitch interpolation, when an edge is detected by a sensor having a low pixel resolution (for example, a unit of about 1.0 mm on a film), a blank portion and a staggered image portion do not change sharply but gently change. Negative film 18 while detecting with a minute pixel pitch of about 1/10 mm pitch
When the direction of change of the time series change amount of the light receiving element is reversed (the position where the change value becomes zero is a reference), the edge position is detected. That is, as shown in FIG. 15, the representative pixel columns P comprising a plurality of light-receiving image of the two-dimensional image sensor, a storage pixel data area M in the memory a plurality (e.g., ^# 1 to ^# 10 10 pixels equivalent of ) As the pixel data is formed on the memory. For example, the storage pixel data M ₁ of the memory corresponding to the light receiving pixel P ₁
As M ₁₁ ~M ₁₁₀ as shown in FIG, the storage data _{M 2} in the memory corresponding to the light receiving pixels _{P 2} and M ₂₁ ~M _210.
Similarly, other light receiving pixels are formed by the memory pixel data of ^# 1 to ^# 10.

After this storage, as shown in FIG. 17, the pixel array data stored in the memory, that is, the image information detected by interpolating the pixel pitch of the negative film 18 is processed to obtain the light amount characteristic PC, and the negative film is obtained. The edge between the unphotographed region (blank region) R and the gap in the gap 18 is detected. In this case, (1) the maximum value PM of the light quantity characteristic PC needs to be within the negative base light quantity value MA and the threshold value CV of a predetermined ratio (for example, 80%). This is because the edge of the negative film image edge is at the boundary between the image area and the unphotographed area, and generally the light amount is larger than the constant threshold CV. Further, (2) the distance at which the light amount has a negative slope from the position of the maximum value PM of the light amount characteristic PC, that is, the distance 1 at which the light amount decreases from the maximum value PM must be a predetermined distance (for example, 1 mm) or more. this is,
This is because the edge is present after passing through the bare area R between the edges and it is necessary to remove the noise component. The range may have a certain tolerance. Furthermore,
(3) The light amount NP at the distance 1 from the maximum value PM corresponds to the edge of the image, and it is necessary that the light amount NP is within a certain ratio range with respect to the maximum value PM. This means that the amount of light is always smaller than the maximum value PM, and the inclination thereof needs to be large to some extent. This is because if there is not much difference in the light amount NP with respect to the maximum value PM, it cannot be distinguished whether it is an image or an unphotographed area. Here, the edge is usually detected when all the above-mentioned three conditions are met. Also, in the case of the first step, the first
The light amount characteristic PC ′ shown by the alternate long and short dash line in FIG. 7 is obtained.
In this example, the true value of the light quantity is 8 bits (0 to 25
Got in 5).

Here, when image information is detected by the light receiving element region 172 of the image sensor 37, data for each pixel as shown in FIG. 12B is obtained. In FIG. 12, it is shown as density information. The data may be a true number or the above-mentioned concentration information obtained by logarithmically converting the reciprocal of the transmittance of the true number. As is clear from the correspondence relationship between FIGS. 12A and 12B, the non-photographing area R between the image areas 2A, 2B, 2C, ...
Generally, there is a significant difference in the density value between A, RB, RC, ..., Therefore, when the density is less than a certain value, and the density value changes abruptly in the horizontal direction, the vertical direction (the negative film 18 By searching the light receiving element area 172 of the image sensor 37 for an area in which the change in the vertical direction (direction of conveyance) is within a certain range, the image areas 2A, 2B, 2C, ...
It is possible to precisely detect the position of the edge, which is the boundary between A, RB, RC, .... FIG. 13 (2) shows this state, and the negative film 18 is at the predetermined position 17
In the light receiving element area of the image sensor, the edge position between the non-photographing area RB and the image area 2A is detected. Then, the light receiving element region 172 of the image sensor 37 comes to come to the central portion of the mask opening. In FIG. 12 (B), the width of the non-imaging area between the gaps is shown wide for the sake of convenience.
This edge can be detected by an exposure control image sensor or the like having a relatively low resolution of about 0 mm, similarly to the method described above. That is, as shown in FIG. 14 (B), the light receiving element region 17 of the image sensor detected with respect to the moving state of the negative film 18 of minute pitch feeding.
The time-series change amount of 2 (light amount change amount, that is, a true value) is as shown in FIG. 9A, and when the change direction is reversed with the position where the light amount change amount becomes zero as a reference, It can be detected as an edge with an image.

The edge detection described above can also be detected by the method described in JP-A-54-103032 using a sensor with high resolution.

If it is determined in step S10 that the leading edge error has been detected, the process proceeds to step S11.

Then, the distance S ₂ from the size information obtained by the size measurement (step S1) until the leading edge is positioned at the predetermined position 17 (in this embodiment, the light receiving element region 172 is located at the center of the mask opening). Therefore, the high-speed fixed amount conveyance is performed in step S11 for only about 1/2 cycle, and then the conveyance is stopped in step S12. As a result, the leading portion is automatically positioned at the predetermined position. After the leading edge is positioned, the sensitivity switching method described above is used to extend the accumulation time of the image sensor to switch to high sensitivity in step S13, and the exposure amount is determined or corrected by measuring the exposure image information to determine in step S14. To determine if printing is required,
If printing is required, printing is performed in step S16. In the next step S19, the accumulation time of the image sensor is shortened, and in step S20, it is judged whether or not the film is present. If the film is present, the second light receiving element region is arranged in the central portion of the mask. Since it is done, step S2
After carrying a little less than 1/2 of 1 and switching to fine pitch feeding at step S8, the second edge pattern edge can be precisely detected by the light receiving element array group of the second light receiving element region 172.

In the case where the negative film 18 is continuously conveyed at a low speed in step S8 until the detection of the second edge pattern is performed in step S10, and the edge positions of the image edge 2A and the non-photographing area RB are detected. Is the above size measurement (step S
Based on the size information obtained in 1), the relevant position is determined at the predetermined position 17
Distance S ₂ to be positioned at high speed to feed the at step S11, stops the subsequent conveyance at step S12. In this case, after the high-speed fixed amount transport S ₁ , the distance E until the position of the edge of the non-imaging region RB between the image areas 2A and 2B and the edge of the image area 2A located at the substantially central portion of the mask opening is detected is Is a parameter (variable) for correcting the variation in the distance of the non-imaging region RB, and the feeding amount D = S ₁ + E + S ₂ (corrected _one amount) of the image area 2A is conveyed in the state of FIG. For example, the negative film 18 stops while being accurately positioned at the predetermined position 17.

After the negative film 18 is conveyed and stopped as described above, in step S13, the accumulation time of the image sensor is lengthened by the sensitivity switching method described above to switch to high sensitivity.
The exposure image information is measured to determine and correct the exposure amount, and it is determined in step S14 whether or not printing is required. If printing is required, printing is performed in step S16. After completion of printing of the pattern or when it is not suitable for printing, the next image pattern is conveyed to the printing position for printing, so that the accumulation time of the image sensor is shortened in step S19.
In step S20, it is judged whether or not the negative film 18 is present, and if the film is present, the above step S is performed.
According to the size information obtained in step 1, the negative film 18 is conveyed at a high speed by about ½ of the gap between steps in step S21, and the process returns to step S8. Hereinafter, by repeating the above-described conveyance and stop, it is possible to sequentially print each image frame. Then, in step S20, the negative film 1
When it is determined that 8 is gone, the motor 50 is automatically stopped and the process ends. Here, the edge is precisely detected at the position corresponding to the central portion of the negative film, but it does not hinder the detection at the portions other than the central portion.

On the other hand, when the streak is no longer detected in step S10, it is an image pattern in which the streak such as underexposure negative cannot be detected. Therefore, in step S22, the length of one normal feeding (in the case of 135F size, 38 mm)
Approximately ½ of the remaining amount is conveyed and stopped at step S12.

As described above, according to the present embodiment, it is possible to insert the film negative into the film conveying device without preselecting the piece negative and the long negative while switching the setting of the device while the film conveying device is driven. Since the leading edge closest to the edge can be automatically stopped at a predetermined position, the leading edge closest to the film edge can be efficiently and automatically positioned.

When the light receiving element region 172 is formed of a light receiving element row group having high resolution, the single pixel pitch is used to detect precisely which row position of the single or a plurality of light receiving element rows the edge is located. You may want to know. By doing so, the speed can be further increased. In this case, the accuracy of detecting the position of the ginger at the printing position 17 becomes high,
Therefore, it is possible to accurately know the film feed amount for locating the shooting pattern at the approximate center of the printing position 17.

Further, the light receiving element region 170 may be configured by a group of light receiving element rows having high resolution so that the edge may be preliminarily detected by a plurality of pixel pitches.
72 may be configured by a combination of a light receiving element array group having high resolution and a light receiving element array group having low resolution.

When the resolution of the two-dimensional image sensor is high, the same pixel pitch may be used for detecting the presence of the edge and the position of the edge. Further, in the above, the example in which the storage time is changed to switch the sensitivity has been described, but the light amount may be switched to switch the sensitivity.
Furthermore, although an example in which a two-dimensional image sensor for exposure control is used has been described above, a separate sensor for edge detection may be provided. Further, although an example in which the present invention is applied to the case of detecting the edge of the leading edge has been described above, the present invention can also be applied to the detection of edges other than the leading edge.

Further, in the above-described embodiment, an example in which the negative film is fed from left to right in one direction has been described. However, the first light receiving element region may be arranged at a symmetrical position with respect to the second light receiving element region. For example, with the same algorithm as above, without the need for mechanical and optical switching operations of the sensor,
The negative film can be easily fed in the reverse direction. In this way, the first light receiving element regions are arranged on both sides of the second light receiving element region so that the negative film can be fed in two directions.
As described in Japanese Patent No. 648, first, the negative film is fed one by one, the image information of each pattern is measured during that period, and then the exposure amount is adjusted according to the image information while the negative film is returned one by one. However, it can also be applied to carry out a method of performing photo printing.

Further, the method for detecting the ginger of the present invention is, for example, in the case of printing from a necessary gull by skipping the aerial shot gaze with a long negative film,
When reprinting with a short negative film or reordering and printing the required number of required patterns in the required number of times, you can use the keyboard in advance to find the required pattern and stop only the desired pattern. It can also be applied to the handling of negative films.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flow chart showing a film transport routine of an embodiment of the present invention, FIG. 2 is a schematic configuration diagram of a printing optical system portion of the above embodiment, and FIG. 3 is a large arm and a small arm. FIG. 4 is a cross-sectional view of the film transporting device with the same etc. removed, FIG. 5 is a diagram showing the average output of the image sensor along the longitudinal direction of the film, and FIG. 6 is an image. FIG. 7 is a block diagram showing an example of a drive system of the sensor, FIG. 7 is a diagram showing an example of a logarithmic table, FIG. 8 is a diagram for explaining the dynamic range of the image sensor, and FIG. 9 is a diagram showing the image sensor. FIG. 10 is a diagram for explaining the operation, FIG. 10 is a diagram showing the structure of a logarithmic table, FIG. 11 is a diagram showing the correspondence relationship between the film passing through the printing position and the light receiving surface of the image sensor, and FIG. Is a memory diagram showing an example of image information FIG. 13 (1) is a diagram for explaining the use range of the light receiving element array group, FIG. 13 (2) is a diagram showing a mask opening of the film transport device, and FIG. FIG. 15 and FIG. 16 are diagrams for explaining the relationship between the data of the pixel column and storage in the memory, and FIG. 17 is a view showing the relationship between the negative film and the detection data on the memory. Is. 18 ... Film, 37 ... Two-dimensional image sensor, 170 ... First light receiving element region, 172 ... Second light receiving element region.

Claims (4)

[Claims] 1. A group of one or more first light receiving element rows extending in a direction orthogonal to the film feeding direction and one or more second light receiving element row groups arranged in parallel in the film feeding direction. When the film is conveyed along with it to detect the gaze, the presence of the gage is first detected in the first light receiving element row group, and the position of the gage is detected in the second light receiving element row group after the gage edge is preliminarily detected. A method for detecting edging, which is characterized by precisely detecting. 2. A method for detecting a gullet according to claim (1), wherein the presence of a gong edge is preliminarily detected by detecting the presence of a film edge in the first light receiving element array group. 3. Each of the first light receiving element row group and the second light receiving element row group is at least one specific light receiving element row extending in a direction orthogonal to a film transport direction of a two-dimensional image sensor. Claim (1) or clause which is a group
(2) The method for detecting ginkgo edible as described in the item (2). 4. When detecting a film edge or an edge by using a two-dimensional image sensor for exposure control of an automatic photographic printer as the two-dimensional image sensor, the two-dimensional image sensor outputs image information for exposure control. Claims in which the sensitivity is lowered relative to the case of detection
The method for detecting edible edging according to (3).