JPH0663971B2 - Color-Document type classification method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a color copying machine suitable for copying a color original having a halftone, such as an electrophotographic color copying machine, a reversal color paper and a diffusion transfer type photosensitive material. The present invention relates to a method for classifying color document types used in a silver salt photographic color copying machine (optical printer), a thermal transfer type color copying machine, an inkjet color printer, a laser color printer, etc.

[Conventional technology]

Recently, color copying machines have become widespread, but in this color copying, it is necessary to finish good color balance as well as density. In this color copying, photographs and printed materials are often used as color originals. However, these have different color balances under the same copying conditions due to differences in coloring materials and human eyes and spectral sensitivity of copying materials. It becomes a copied image. For example, in a color printing original, the spectral density distributions of magenta ink and cyan ink overlap greatly.Therefore, in a color copier in which copying conditions are set so that the color printing original is finished well, the magenta density of the printing original is high The copy conditions are such that formation is suppressed. Therefore, when a color photographic original is copied under these copying conditions, a magenta color is lacking and a color copied image that looks greenish is created.

In order to solve this problem, in the conventional color copying machine,
Copy conditions (color filter adjustment amount, exposure amount, charge amount, development bias amount) are set according to the color photo original and the color print original, and the operator selects the color original type to operate the selection key. The copy condition according to is selected.

[Problems to be solved by the invention]

As described above, in the conventional color copying machine, the color original type is discriminated based on the experience of the operator in consideration of the presence or absence of the halftone dot, but the operator who does not have the specialized knowledge can understand the current color printing technology. Due to the progress, it has been difficult to accurately discriminate between a color photograph and a color print produced from now.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a color document type classification method capable of accurately determining a color document type.

[Means for solving problems]

In order to achieve the above object, the present invention provides a first method having a sensitivity peak at the maximum absorption wavelength of a cyan dye in a photographic original.
By measuring the reflected light of the color original using the sensor of No. 2 and a second sensor having a sensitivity peak at the maximum absorption wavelength of the cyan ink in the printed original, and comparing the two measured values obtained. The manuscript is classified into at least a photo manuscript and a print manuscript.

Another invention uses a first sensor having a sensitivity peak at the maximum absorption wavelength of a magenta dye in a photographic original and a second sensor having a sensitivity peak at the maximum absorption wavelength of magenta ink in a printed original to produce a color original. By measuring the reflected light and comparing the obtained two types of measured values, the color original is classified into at least a photographic original and a printed original.

Still another invention is a first sensor having a sensitivity peak at a maximum absorption wavelength of a cyan dye in a photographic original, a second sensor having a sensitivity peak at a maximum absorption wavelength of cyan ink in a printing original, and a photographic original. The reflected light of each area of the color original was measured by using a third sensor having a sensitivity peak at the maximum absorption wavelength of the magenta dye and a fourth sensor having a sensitivity peak at the maximum absorption wavelength of the magenta ink in the print original. , Comparing two types of measurement values of the same area measured by the first and second sensors,
Two types of measurement values of the same area measured by the third and fourth sensors are compared, and a color original is classified into at least a photographic original and a print original based on a combination of these two comparison results. is there. In the comparison, there are cases where the output of the sensor is used as it is, cases where the output is converted into concentration values by a logarithmic converter, and the like, and there are methods for comparison such as obtaining a difference and obtaining a ratio.

[Operation of the invention]

The density measurement is performed for the three primary colors of green light or red light before color copying. When measuring green light, a first sensor having a sensitivity peak at 540 ± 15 nm and a second sensor having a sensitivity peak at 570 ± 15 nm are used. When measuring red light, a sensor having a sensitivity peak at 630 ± 40 nm is used as the first sensor, and a sensor having a sensitivity peak at 680 ± 40 nm is used as the second sensor.

The two types of measurement values measured for the same color are compared, and the color original document is classified into at least a color print original document and a color photographic original document. According to this classification judgment, the copying conditions of the color copying machine to be used are set, and a good color balance is achieved in consideration of the type of color original.

The measurement may be a method of measuring the entire color original, a method of measuring one-dimensionally with slit light, or a method of measuring two-dimensionally using a color image sensor.

Another invention is a first sensor having a sensitivity peak at a maximum absorption wavelength of a cyan dye in a photographic original, a second sensor having a sensitivity peak at a maximum absorption wavelength of cyan ink in a printing original, and a magenta dye in a photographic original. A third sensor having a sensitivity peak at the maximum absorption wavelength of
The reflected light of each area of the color original was measured using a fourth sensor having a sensitivity peak at the maximum absorption wavelength of magenta ink in the printed original, and two types of the same area measured by the first and second sensors were measured. The measured values are compared, and two types of measured values of the same area measured by the third and fourth sensors are compared, and from the combination of these two comparison results, a color original is at least a photographic original and a printed original. It is designed to be classified. That is, in the present invention, two types of green light and two types of red light are measured, and a total of four types of reflected light are measured. The obtained two types of measured values in the green wavelength range (measured values of the third and fourth sensors) are compared for each same area, and if the difference is less than or equal to the first threshold value is less than or equal to a certain value, It is determined that the color original is a print original, and if the number that is equal to or greater than the second threshold value is a certain value or more, the color original is determined to be a photographic original. For those that cannot be classified by these judgments, two types of measurement values in the red wavelength range (measurement values of the first and second sensors) are used, and the number of those whose difference is within the third threshold value is determined. When the value is equal to or more than a certain value, the color original is determined to be a photographic original, and the others are determined to be a print original.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

〔Example〕

FIG. 2 shows spectral reflection densities of a color photograph and a color print having an average color distribution in which a medium-high density color image is recorded. The density curve 2 shown by the solid line is the density distribution of a color photograph. The density curve 3 shown by a dotted line is the density distribution of color printing, and has a reflection density peak in green.

The magenta dye used for color photography is 530-560.
There is a maximum concentration (maximum absorption wavelength) in nm, and the cyan dye is 65
There is a maximum concentration near 0 nm. Moreover, the magenta dye and the cyan dye have a characteristic that the density (absorption) sharply decreases around the maximum absorption wavelength.

On the other hand, the magenta ink used for color printing is
It has a maximum concentration around 570 nm. Cyan ink has a density that is almost flat from 600 to 700 nm.
At wavelengths longer than 0 nm, a sharper decrease in density is seen than in the cyan dye of color photographs.

As described above, since color materials having different characteristics are used depending on the type of color original, the reflected light is measured using two types of sensors having sensitivity peaks at different wavelengths within the wavelength range of the same color. By comparing the two types of measured values obtained, for example, the spectral reflection density or the spectral intensity, it is possible to discriminate the color original document type. In FIG.
The curve g1 shows the sensitivity curve of the first green sensor for measuring green light of the three primary color lights.
There is a sensitivity peak at ± 15 nm. The curve g2 shows the sensitivity curve of the second green sensor for measuring green light of the three primary color lights, and has a sensitivity peak at a wavelength of 570 ± 15 nm. The curve r1 shows the sensitivity curve of the first red sensor for measuring red light of the three primary colors, and the wavelength 63
There is a sensitivity peak at 0 ± 40 nm. A curve r2 shows the sensitivity curve of the second red sensor for measuring red light of the three primary color lights, and has a sensitivity peak at a wavelength of 680 ± 40 nm. Especially, if the sensitivity peak of wavelength r1 is 650 ± 20 nm, the sensitivity peak of wavelength r2 is 700 ± 20 nm, and
, The wavelength r2 is desired to have a sensitivity peak of 660 ± 20 nm.

When green light is measured to determine the type of color original document, the first and second green sensors are used. On the other hand, when red light is measured to determine the type of color original document, the first and second red sensors are used. Also, some color originals have less green component or less red component, so if only one of green light or red light is measured, determine the color original type correctly. I can't. Therefore, the determination accuracy is improved by measuring the green light and the red light using the four types of sensors and using the obtained four types of densities. Either green light or red light measurement order and determination order based on these measurement values may be given first.

FIG. 1 shows the basic configuration of the present invention. Pre-scanning is performed prior to color copying. During this pre-scan, the color document 10 is moved in the direction of the arrow while the light source 11
To illuminate the color original 10. The reflected light from the color original 10 is passed through the lenses 12 and 13 to the first sensor 14 and the second sensor 14.
Measure with sensor 15 respectively. The color original 10 is stopped, the light source 11 is moved instead, and the reflected light from the color original 10 is guided to the first and second sensors 14 and 15 via a mirror system (not shown). Good.

The output signals of the first and second sensors 14 and 15 are output to the amplifier 1
After being amplified in 6, it is converted into a density signal in the A / D converter 17. The two types of density signals are supplied to the photometric data processing unit 18
Sent to RAM19 via. After the prescan, the photometric data processing unit 18 reads out two types of density signals of each color from the RAM 19 and compares them. The result of this comparison is sent to the color document type determination unit 20, where the color document type is determined.

The determination result of the color original type is sent to the process condition setting unit 21, and the RO that stores the process condition for the color original type
Set process conditions by referring to M22. This process condition is for controlling the image quality of the copied image to be good according to the type of the color original document, and naturally it varies depending on the type of the color copying machine. It is possible to improve the density and color balance by controlling the copy conditions such as the exposure amount, the charge amount, and the developing bias amount.

In addition to the control of copying conditions, the process conditions include selection of copying materials having different characteristics such as gradation, formed dye, surface quality, and selection of development processing conditions such as development processing step and time. Control, selection and control of the light source that illuminates the original,
It includes gradation control such as sub-exposure, and image quality control such as color reproduction, tone reproduction, and sharpness in a scanned image.

Next, an example of determining the color document type will be described. FIG. 4 shows an embodiment in which red light is measured to determine the type of color original. In this embodiment, as shown by r1 in FIG. 3, a sensor having a sensitivity peak at 630 ± 40 nm is used as the first sensor. As the second sensor 15, as shown by r2 in FIG. 3, a sensor having a sensitivity peak at 680 ± 40 nm is used. These sensors 14 and 15 are used to measure two types of red densities R1i and R2i for each slit area,
This is stored in RAM19. Next, the red densities R1i and R2i of each slit area are read in order and the one satisfying the following conditional expression is extracted.

KD1 <(R1i + R2i) / 2 <KD2 where KD1 and KD2 are constants, for example, “0.3” and “1.
5 ”is used.

Red density R1i, R2i of slit area extracted in this way
From that, the ratio (R1i / R2i) is calculated. This ratio is `` 1.
If it is "1" or more, it is determined to be a color photographic original, and if it is less than "1.1", it is determined to be a color print original. A process condition is set according to the result of this determination, and color copying is performed under this condition.

In the above explanation, from the magnitude of the ratio of the two types of red density,
Color document type is discriminated, but this is the difference (R1i-R2i)
May be used. In this case, when the difference is "0.1" or more, it is determined that the document is a color document, and when it is less than "0.1", it is determined that the document is a color print document.

Further, although the color original 10 is measured by the area, the reflected light from the entire surface of the color original 10 may be incident on the sensor to perform the average photometry, and further, each point of the color original 10 can be measured by using the color image sensor. May be metered.

Instead of the red sensor, a green sensor may be used to determine the color original type. In this case, the sensitivity curve g of FIG. 3 is used as the first sensor 14 and the second sensor 15.
Two kinds of green density G1i, G2i using the one with 1, g2
To measure. Then, the ratio of the two types of green density (G1i / G2
When i) is "1.0" or more, it is determined to be a color photographic original, and when it is less than "1.0", it is determined to be a color print original. Also, the difference between the two types of green density (G1i-G2i)
When it is used, it is determined that it is a color photographic original when it is “0.0” or more, and it is determined that it is a color print original when it is less than “0.0”.

Further, by statistically processing two types of densities, for example, green densities, it is possible to determine the color original document type. That is,
When the density difference (G1-G2) is plotted on the vertical axis and the green density G1 is plotted on the horizontal axis, the density distribution as shown in FIG. 5 is obtained. The species can be identified. Further, if a histogram as shown in FIG. 6 is created, the positions of the peaks will be different, so by examining this peak value, it is possible to distinguish between a color photographic original and a color printed original.

FIG. 7 shows an apparatus that measures red light and green light and discriminates a color original document type by using the obtained four types of reflection densities. It is attached with a code. Behind the four lenses 25 to 28, four kinds of sensors 29 to 32 having the sensitivity curves g1, g2, r1 and r2 of FIG. 3 are arranged, respectively. The output signals of these sensors 29 to 32 are signal-processed in the same manner as in the above-mentioned embodiment and converted into four types of density signals.

FIG. 8 is an example of a discrimination process using four kinds of density values. First, the green density is read out for each slit area, and one that satisfies the following conditional expression is selected.

G1i-G2i <-0.01 (1) If there are K or more that satisfy the conditional expression (1), it is determined that the document is a color print document. Here, K is a constant, and for example, a number corresponding to 20% of the total number of slit areas is used.

If less than K satisfy conditional expression (1), it is determined whether the following conditional expression is satisfied.

G1i-G2i> 0.1 (2) If there are K or more that satisfy the conditional expression (2), it is determined that the document is a color photographic document.

If less than K satisfy the conditional expression (2), the following conditional expression is used for the determination.

R1> 0.4 (3) If this conditional expression (3) is not satisfied, it is determined that the original is an intermediate color original. This intermediate color original is an original with many white backgrounds such as character images and illustration images. The intermediate color original may be set to the same process condition as the color print original.

Next, it is determined whether or not there are K or more that satisfy the conditional expression (4).

R1i−R2i> 0.1 (4) If this is satisfied, it is determined that the document is a color photographic document, and if it is not satisfied, it is determined that the document is a color print document. This conditional expression (4) is particularly effective when the sensitivity peak of the sensitivity curve r1 is 650 ± 20 nm and the sensitivity peak of the sensitivity curve r2 is 700 ± 20 nm. However, when the sensitivity peak of the sensitivity curve r1 is 610 ± 20 nm and the sensitivity peak of the sensitivity curve r2 is 660 ± 20 nm, it is preferable to use R1i−R2i <0.0 (4 ′). If conditional expression (4 ') is satisfied, it is determined that the photograph is a color photograph, and if not, it is determined that the document is a color print original.

Further, it is preferable to determine whether to use the density for the determination or to select the discriminants (1) to (4) depending on the magnitude relationship between the green density and the red density.

By the above procedure, color photo originals, color print originals and intermediate color originals are classified, and color copying is performed after setting process conditions according to these color original types.

FIG. 9 shows a silver salt photographic color copying machine embodying the present invention. A color document 36 is placed on the transparent document table 35 with the document surface facing down. Actually, the color document 36 is pressed from above by a document pressing plate (not shown) having a white lower surface. Further, a white standard plate 37 is attached to the lower surface of the document table 35 at the left end, and the reflected light is measured to correct a change with time of a light source or a color filter described later.

The light source unit 38 has a light source 39, a reflector 40, and a mirror 41 built-in, and reciprocates in parallel with the document table 35 to produce a color document.
Slit the 36. The mirror unit 42 holds two mirrors 43 and 44 extending in a direction perpendicular to the paper surface,
The light from the light source unit 38 is folded back in parallel. Further, the mirror unit 42 moves in the arrow direction at the time of converting the magnification.

The lens unit 46 moves back and forth along the optical axis in synchronism with the light source unit 38 in order to correct the focus shift due to the movement of the light source unit 38. This lens unit 46 includes a front group 47.
A yellow filter Y, a magenta filter M, and a cyan filter C are arranged between the rear group 48 and the rear group 48. These color filters Y, M, C are movable in a direction orthogonal to the optical axis, and the quality of slit light is adjusted by the insertion amount to correct the color balance. Further, behind the rear group 48, two diaphragm plates 49, 50 which move in mutually opposite directions are arranged.

The light that has passed through the lens unit 46 is returned by the mirrors 52 and 53 and then reaches the optical path switching mirror 55 with the shaft 54 as the center of rotation. During the pre-scan, the condensing mirror 56 is inserted in the optical path as shown by the dotted line, and the optical path switching mirror 55 is also retracted from the optical path as shown by the dotted line, and the color original 36
The reflected light from is collected and put into the measuring means 57.

The condensing mirror 56 includes a plurality of mirrors 56a, and as shown in FIG. 10, each mirror 56a is arranged at an angle according to the distance from the optical axis, thereby condensing slit light. And put in the measuring means 57. The measuring means 57 is the eleventh
As shown in the figure, the first blue sensor 57a, the second blue sensor 57b, the first green sensor 57c, the second green sensor
57d, a first red sensor 57e, and a second red sensor 57f.

The first blue sensor 57a has a sensitivity peak at about 400 nm, and the second blue sensor 57b has a sensitivity peak at about 450 nm.
It is in. The first green sensor 57c has a sensitivity curve g shown in FIG.
The one with 1 is used, and the second green sensor 57d is
The one having the sensitivity curve g2 is used. The first red sensor 57e having a sensitivity curve r1 is used.
A sensor having a sensitivity curve r2 is used as the red sensor 57f.

A photosensitive sheet 61 of a diffusion transfer type photosensitive material is stored in the magazine 60 in a rolled state. The photosensitive sheet 61 is pulled out by a pair of pulling rollers 62 and 63, and when it is pulled out for a certain length, it is cut by a cutter 64. The edge of the cut photosensitive sheet 61a has a pair of rollers 65,
Stop at the position bitten by 66. Roller pairs 67 and 68 are arranged to face the roller pairs 65 and 66, a slit exposure position is formed between these four rollers 65 to 68, and light from the optical path switching mirror 55 enters.

At the time of copying, the rollers 65 to 68 rotate in synchronization with the light source unit 46, and the photosensitive sheet 61a is transported toward the turning roller 70. A guide 71 is arranged so as to surround the outer circumference of the turning roller 70, and a driven roller 72 is arranged so as to be in contact therewith. The exposed photosensitive sheet 61a is reversely transported by the turning roller 70, and its leading end hits the first stopper 73 and is stopped at the position.

The image receiving sheet 75 includes a developing pod 76 containing a developing solution and a bag-shaped funnel for guiding the developing solution flowing out from the developing pod 76.
77 and are attached to the tip. This image receiving sheet 75
Are stored in the cassette 78 in a state where a plurality of sheets are stacked. The roller 79 is inserted into the cassette 78 when the cassette 78 is mounted, and the image receiving sheet 75 on the top is pre-scanned during the prescan.
Is sent out, and the rollers 80 and 81 are made to stand by while being bitten. Then, at the time of color copying, the pair of rollers 80 and 81 are rotated to transfer the leading end of the image receiving sheet 75 to the position where the second stopper 82 contacts. The rollers 79 to 81 are arranged so as to sandwich both ends of the image receiving sheet 75 in order to prevent the developing pod 76 from being crushed. This exposure sheet
As the 61a and the image receiving sheet 75, those having almost the same structure as an instant color film which is already on the market are used.

The photosensitive sheet 61a and the image receiving sheet 75 are joined by a sealer 85 and then passed between a pair of developing rollers 86 and 87.
At this time, the developing pod 76 is cleaved and the flowing developing solution is spread between the photosensitive sheet 61a and the image receiving sheet 75 to have a uniform thickness. The two sheets on which the developing solution has been spread are placed on the constant temperature plate 88 and left for a predetermined developing time, and then the image receiving sheet 75 is peeled off.

Next, the operation of this color copying machine will be described. First, the color document 36 to be copied is placed on the document table 35, and then a copy key (not shown) is operated. When the copy key is turned on, feeding of the photosensitive sheet 61 and the image receiving sheet 75 and prescanning are started as described later.

That is, at the time of feeding the image receiving sheet 75, the rollers 79 to 81 rotate, and a plurality of image receiving sheets stacked in the cassette 78 are provided.
Send out the top of the 75. The image receiving sheet 75 sent out stops in a state where the leading edge of the image receiving sheet 75 is bitten by the pair of rollers 80 and 81. The photosensitive sheet 61 is pulled out by the pair of rollers 62 and 63, and is cut by the cutter 64 when it is pulled out for a certain length. At the time of this cutting, the photosensitive sheet 61
Since the tip of a is bitten by the rollers 67, 68, the photosensitive sheet 61a is further fed by the rollers 67, 68. Then, when the tip of the photosensitive sheet 61a is bitten by the roller pair 65, 66,
The rollers 65 to 68 stop rotating.

When starting the prescan, first, color filter Y,
Set M and C to the standard position. Further, the diaphragm plates 49 and 50 are set at standard positions, the condenser mirror 56 is inserted into the optical path as shown by the dotted line, and the switching mirror 55 is retracted to the position shown by the dotted line. Under this state, the light source unit 38 and the lens unit 46 are synchronously moved to start the prescan. In the initial stage of this pre-scan, the light emitted from the light source 39 is reflected by the standard plate 37, then passes through the mirrors 41 to 44, the lens unit 46, the mirrors 52 and 53, and then enters the condenser mirror 56. This condenser mirror 56 is
As shown in FIG. 10, the slit light is condensed and guided to the measuring means 57. Since the light source unit 38 moves at a constant speed, the color original 36 is slit-illuminated following the standard plate 37. The reflected light from the color original 36 is also measured by the measuring means 57. When the prescan ends, the illumination unit 38 and the lens unit 46 return to the initial positions shown in FIG.
At the same time, the condenser mirror 56 is retracted from the optical path as shown by the solid line, and the switching mirror 55 is inserted in the optical path.

By performing slit measurement on the standard plate 37 using the six sensors 57a to 57f, two types of reflection densities, two types for each of colored light, green light, and red light, and a total of six types of reflection densities can be obtained for each slit area. To be Of these six types of reflection densities, those of the same color are added and the average value thereof is calculated to calculate the blue density, the green density, and the red density. Since the standard plate 37 has three color densities known in advance, the light source 39, is calculated from the deviation amount from the current three color densities obtained by the prescan.
The change with time of the color filter can be detected.

Also, for the color original 36, six types of reflection densities are measured for each slit area. From these reflection densities, two types of green densities and two types of red densities are extracted, and the color original document type is determined by the procedure shown in FIG.

When it is determined that the color original 36 is a color photograph, the color filter amount for color photographs stored in the ROM 22 is read, and the amount of color filters Y, M, and C inserted into the optical path is adjusted, Improves color balance. On the other hand, when it is determined that the color original document 36 is a color print original document, the color filter amount for color printing is read from the ROM 22 and the insertion amount of the color filters Y, M, and C into the optical path is adjusted.

By the above filter adjustment, the color balance of the copied image can be improved for most color originals, but color correction may be performed for each color original. In this case, the six types of reflection densities obtained by measuring the color original 35 are added for each color, and the arithmetic mean is calculated to calculate the blue density, the green density, and the red density. Then, the red, green, and blue correction amounts are calculated from the three-color densities. For the calculation of this correction amount, a known exposure amount calculation formula for a photo printing machine can be used. The amount of deviation due to the above-described change with time is added to the obtained exposure amount of each color, and the insertion amounts of the yellow filters Y, magenta filters M, and cyan filters C into the optical path are adjusted according to the calculation results. If the correction cannot be done with these color filters Y, M, C, the diaphragm plates 49, 50 are slid.

When the adjustment of the color filter is completed, the light source unit 38 moves again to slit-illuminate the color original 36. The rollers 65 to 68 rotate in synchronization with the slit illumination, and the photosensitive sheet 61a is continuously moved to perform slit exposure of the photosensitive sheet 61a.
By this slit exposure, the color original 3 is printed on the photosensitive sheet 61a.
Six images are recorded as latent images. This photosensitive sheet 61a
While being reversed by the turning roller 70, the tip is transferred to a position where its tip end collides with the first stopper 73. In this state, the rear end of the photosensitive sheet 61a is rotated by the rotatable roller 72.
Is loosely sandwiched between.

After positioning the photosensitive sheet 61a, the first stopper 73
Rotates in the direction of the arrow and retracts from the passage of the photosensitive sheet 61a. Next, the rollers 80 and 81 rotate to transfer the image receiving sheet 75, and insert the image receiving sheet 75 below the photosensitive sheet 61a. These rollers 80, 81 stop when the leading edge of the image receiving sheet 75 hits the second stopper 78. This allows the image receiving sheet
The photosensitive sheet 61a is overlaid on the funnel 77 of 75. Next, the sealer 85 descends to join the leading end of the photosensitive sheet 61a onto the funnel 77. This joining is intended to prevent positional deviation between the photosensitive sheet 61a and the image receiving sheet 75 at the time of unfolding processing, thereby preventing blurring of the color copy image and displacement of the copy position. In order to achieve the above, hot melt (adhesive) is applied on the funnel 77.

After retracting the second stopper 82, the rollers 80, 81
Is rotated again to push the rear end of the joined image-receiving sheet 75 to cause the developing rollers 86 and 87 to bite. This image receiving sheet 75
When the sheet is transferred, the photosensitive sheet 61a joined thereto is also transferred together, but at this time, the roller 72 follows the sheet 72 and rotates.

Since the developing rollers 86 and 87 rotate together with the rollers 80 and 81, they bite the two sheets 61a and 75 and convey them while pressurizing them. At the initial stage of this bite, the developing pod 76 is cleaved, so that the developer stored in
A uniform liquid thickness is developed between the sheets 61a and 75. The two sheets 61a and 75 that have been subjected to the expansion processing have a predetermined temperature, for example, 25
It is left on a constant temperature plate 88 kept at ℃. If the image receiving sheet 75 is peeled off after a lapse of a predetermined time, a color copy on which a color image is recorded can be obtained by well-known diffusion transfer.

FIG. 12 shows another embodiment of the present invention. A color original 101 is mounted on the outer periphery of the platen 100, and the light source 10
It is slit illuminated at 2. The reflected light of the color original 101 is sequentially passed through the slit 103 and the lens unit 104,
It reaches the optical path switching mirror 105.

During the prescan, the optical path switching mirror 105 is set to the position shown by the solid line, and the rotation of the platen 100 causes the color original 101 to be sequentially slit-illuminated from one end to the other end. This slit illumination allows color original 101
The reflected light from is measured by the measuring means 106. From the six types of reflection densities measured by this prescan, the type and color correction amount of the color original 101 are calculated by the procedure described above.

When the prescan ends, the optical path switching mirror 105
Moves to the position indicated by the dotted line. Then, the platen 100 is continuously rotated three times, and the red filter R, the green filter G, and the blue filter B are sequentially inserted into the optical path during each rotation, and the color copy image is recorded by the three-color sequence. That is, first, when recording a cyan image, the red filter R is inserted in the optical path instead of the light shielding plate 107, and the voltage applied to the charger 110 is adjusted according to the red correction amount obtained by the prescan.

When the photosensitive drum 111 rotates in synchronization with the platen 100, the outer peripheral surface of the photosensitive drum 111 is charged with electric charges in consideration of the red color correction amount. Then, the light transmitted through the red filter R reaches the photosensitive drum 111 via the mirror 112 and exposes it. By this exposure, the electric charge is removed from the portion exposed to the light, and the electric charge remains only in the portion not exposed to the light. After this exposure,
The electrostatic latent image recorded on the photosensitive drum 111 is the cyan developing device 1.
Developed at 13 to form a cyan toner image.

Simultaneously with the slit exposure of the photosensitive drum 111, the roller 115
Rotates to send out the recording paper 116. The recording paper 116 is guided while being wound around the outer periphery of the drum 114, and the charging device 117
Thus, the cyan toner image on the photosensitive drum 111 is transferred onto it. After this transfer, the recording paper 116 is transported together with the drum 114, but since the gate 118 is at the position shown by the dotted line, the recording paper 116 is rotated once again. Note that reference numeral 119
Is a cleaner for removing the toner not transferred onto the recording paper 116.

After the transfer of the cyan toner image, the green filter G is inserted into the optical path. In this state, platen 100 and photosensitive drum 1
Since 11 and 11 rotate in synchronization with each other, an electrostatic latent image of a green image is recorded on the photosensitive drum 111. At the time of recording this green image, the applied voltage of the charger 110 is set to a standard value for the color print original and the intermediate color original, and set to a voltage higher than the standard value for the color photographic original. .

The green electrostatic latent image recorded on the photosensitive drum 111 is developed by the magenta developing device 120, converted into a magenta toner image, and transferred to the recording paper 116 by the charging device 117. next,
The blue filter B is inserted into the optical path, and a blue electrostatic latent image is formed on the photosensitive drum 111. The blue electrostatic latent image is developed into a yellow toner image by the yellow developing device 121 and then transferred to the recording paper 114.

In this way, when the platen 100, the photosensitive drum 111, and the drum 114 are continuously rotated to sequentially record the cyan toner image, the magenta toner image, and the yellow toner image on the recording paper 116, the gate 1
18 moves to the position shown by the solid line. For this purpose, the recording paper 11
6 rides on the conveyor belt 122 away from the drum 114,
It is sent to the fixing device 123. The fixing device 123 pressurizes and heats the recording paper 116 to adhere three color toners to the recording paper 116,
This is discharged to the tray 124.

Color printing and color photographs may be mixed in one color original. Even in such a case, the present invention can also be used to determine the document type of each part in the color document and obtain the region or area ratio. For this mixed document, it is preferable to select a desired copy condition from a plurality of copy conditions prepared in advance, depending on the area ratio of each color document type, the place occupied in the document, the degree of importance, and the like.
In addition to the above classification, black and white originals, originals with many black plates, single color originals, etc. can be easily classified.

In the above-mentioned embodiment, slit photometry is performed on the color original document, but average photometry may be performed by injecting light from the entire surface of the color original document into the sensor, or each color original document may be measured using a color image area sensor. The point may be metered.

Although red or green light or both of the three primary color lights are used, blue light of 400 to 500 nm, for example, may be measured and used in combination with this to determine the color original type.

〔The invention's effect〕

As described in detail above, according to the present invention, the first sensor having the sensitivity peak at the maximum absorption wavelength of the cyan dye in the three-primary-color photo original, and the sensitivity peak at the maximum absorption wavelength of the cyan ink in the print original. Or a second sensor having a sensitivity peak at the maximum absorption wavelength of the magenta dye in the photographic original and a second sensor having a sensitivity peak at the maximum absorption wavelength of the magenta ink in the printed original. Since the color document type is determined by comparing the obtained two types of measured values with or without using a sensor, the color document type can be determined with high accuracy.

Further, a first sensor having a sensitivity peak at the maximum absorption wavelength of the cyan dye in the photographic original, and a second sensor having a sensitivity peak at the maximum absorption wavelength of the cyan ink in the printed original.
Of the color original, the third sensor having the sensitivity peak at the maximum absorption wavelength of the magenta dye in the photographic original, and the fourth sensor having the sensitivity peak at the maximum absorption wavelength of the magenta ink in the printed original. The reflected light of each area is measured, two kinds of measurement values of the same area measured by the first and second sensors are compared, and two kinds of measurement values of the same area measured by the third and fourth sensors are compared. Since the color originals are classified into the photographic originals and the print originals based on the combination of these two comparison results, the determination accuracy can be further improved. For example, some color originals have a small amount of green component or a small amount of red component. Therefore, if only one of the green light and the red light is measured, the color original type may not be correctly determined. However, this can be eliminated, and the color document type can be determined with higher accuracy.

[Brief description of drawings]

FIG. 1 is a block diagram showing the outline of the present invention. FIG. 2 is a graph showing the spectral reflection densities of a color photographic original and a color printed original on which a medium-high density color image is recorded. FIG. 3 is a graph showing the relative sensitivity of the sensor. FIG. 4 is a flow chart showing an embodiment for discriminating a color original document type using two types of red densities. FIG. 5 is a graph showing the relationship between the density difference (G1-G2) between the color photograph original and the color printed original and G1. Fig. 6 shows the density difference (G1
It is a histogram showing the distribution of −G2). FIG. 7 is a schematic diagram showing a main part of an embodiment in which the color original type is discriminated by measuring the green density and the red density. FIG. 8 is a flowchart of an embodiment in which the color original type is discriminated using the green density and the red density. FIG. 9 is a schematic view showing an example of a silver salt photographic color copying machine embodying the present invention. FIG. 10 is a sectional view of the condenser mirror. FIG. 11 is a plan view of the measuring means. FIG. 12 is a schematic view showing an example of an electrophotographic color copying machine embodying the present invention. 10 …… Color original 14,15 …… Sensor 29 to 32 …… Sensor 35 …… Original plate 36 …… Color original 37 …… Standard plate 38 …… Light source unit 46 …… Lens unit 49,50 …… Aperture plate 55 ...... Switching mirror 56 …… Condensing mirror 57 …… Measuring means 60 …… Magazine 61 …… Sensitive sheet 78 …… Cassette 86,87 …… Developing roller 100 …… Platen 101 …… Color original 105 …… Switching mirror 106 …… Measuring means 110,117 …… Charger 111 …… Photosensitive drum 116 …… Recording paper.

Claims (8)

[Claims] 1. A method of classifying a color document type into which a color document is classified into at least a photo document and a print document, comprising: a first sensor having a sensitivity peak at a maximum absorption wavelength of a cyan dye in the photo document; The reflected light of the color original is measured using a second sensor having a sensitivity peak at the maximum absorption wavelength of cyan ink,
A method of classifying a color document type, characterized in that a color document is classified into at least a photo document and a print document by comparing the obtained two kinds of measured values. 2. The sensitivity peak of the first sensor is 630 ± 4.
nm, and the sensitivity peak of the second sensor is 680 ± 4 nm. The method for classifying color document types according to claim 1, wherein 3. A color document type classification method for classifying a color document into at least a photo document and a print document, wherein a first sensor having a sensitivity peak at a maximum absorption wavelength of a magenta dye in the photo document, and a print document in the print document. The reflected light of the color original is measured using a second sensor having a sensitivity peak at the maximum absorption wavelength of magenta ink, and the obtained two measured values are compared to print the color original at least as a photographic original. A method for classifying color document types, which is characterized by classifying into originals. 4. The sensitivity peak of the first sensor is 540 ± 1.
5. The method for classifying color document types according to claim 3, wherein the second sensor has a sensitivity peak of 570 ± 15 nm. 5. A color document type classification method for classifying a color document into at least a photographic document and a printed document, wherein a first sensor having a sensitivity peak at a maximum absorption wavelength of a cyan dye in the photographic document, and the printed document. A second sensor having a sensitivity peak at the maximum absorption wavelength of cyan ink, and a third sensor having a sensitivity peak at the maximum absorption wavelength of the magenta dye in the photographic document,
The reflected light of each area of the color original is measured by using a fourth sensor having a sensitivity peak at the maximum absorption wavelength of magenta ink in the printed original, and the two areas of the same area measured by the first and second sensors are measured. 2 of the same area measured by the 3rd and 4th sensors by comparing the measured values of different types
A method of classifying a color original document type, characterized in that color original documents are classified into at least a photographic original document and a printed original document based on a combination of these two comparison results. 6. The sensitivity peak of the first sensor is 630 ± 4.
0 nm, the second sensor has a sensitivity peak of 680 ± 40 nm, the third sensor has a sensitivity peak of 540 ± 15 nm, and the fourth sensor has a sensitivity peak of 570 ± 15 nm. A method for classifying a color original document according to claim 5. 7. The method according to claim 6, wherein the measured value is a density value. 8. A color original is determined to be a print original when the number of densities in the third and fourth sensors, which is equal to or less than a first threshold value, is equal to or less than a predetermined value, and the second threshold value is determined. If the number above is a certain value or more, it is determined that the color original is a photographic original, and for those that cannot be classified by these determinations, the difference in density between the first and second sensors is A color original is determined to be a photographic original when the number within the third threshold is equal to or greater than a certain value, and the other is determined to be a print original. Color manuscript type classification method described in item 7.