JP3347153B2 - Color image reader - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color image reading apparatus, and more particularly to an apparatus suitable for reading a color image on a film. The apparatus reads a color image formed by an optical system as color separation signals for three colors. The present invention relates to a color image reading device having means.

[0002]

2. Description of the Related Art When reading a color image formed by an optical system, a color film has characteristics different from those of a normal reflection type original.

For example, even for the same subject, the transmission density varies depending on the exposure conditions to be photographed, and the red and green colors vary depending on the type of film such as the difference between negative or positive or the difference in sensitivity. , Blue (hereinafter referred to as R, G, B) light have different balances.

In Japanese Patent Application Laid-Open No. 2-65374, a reference look-up table (hereinafter referred to as an LUT) is provided for performing image reading by correcting the above difference, and is inputted and set in advance. A technique is disclosed in which image reading data is corrected based on a difference between a reference value and a converted digital image signal obtained by reading an image.

[0005]

However, in the above-mentioned conventional device, it is necessary to prepare a memory for an LUT which is used as a reference only for the number of types of films, so that the circuit cost is increased accordingly.

In order to perform the correction using the LUT, a complicated configuration or operation such as inputting the type of film is required. In this aspect, the cost is high and the operation is difficult.

Further, if the correction is uniformly performed using a preset reference value, for example, even though a scene with a low contrast is photographed, the contrast is increased by the correction, and the output intended by the photographer cannot be output. Inconvenience occurs.

Further, when the balance of R, G, and B is lost as in a sunset scene, even if the balance of the R, G, and B image data is corrected uniformly, the photographer is aimed at in the same manner as described above. No output can be output.

Therefore, the present invention extracts characteristic values relating to differences in exposure conditions and the type of film from data obtained by reading an image, and corrects the contents in accordance with the extracted data. It is an object of the present invention to provide a color image reading device capable of solving various problems.

[0010]

In order to achieve the above object, an image pickup means for reading a color image and obtaining color-separated image data, and image data for each color obtained by the image pickup means Color balance correction means for correcting the color balance, contrast correction means for correcting the contrast of the image data obtained by the imaging means, and image data of each color obtained by the imaging means Extracting means for extracting first data indicating the magnitude of the variation between the colors, based on the image data, and a predetermined one color of the image data of each color obtained by the imaging means.
Extracting the second data indicating the size difference of the image data of
Extracting means; first control means for inhibiting correction by the color balance correction means and the contrast correction means when the first data is larger than a first threshold value; And the second data is the
A main feature is that a second control unit that permits correction by the color balance correction unit and prohibits correction by the contrast correction unit when the threshold value is equal to or less than two thresholds is provided.

The first data of the present invention is calculated using the maximum value or the minimum value of the image data of a plurality of pixels obtained by the imaging means.

Further, the first data of the present invention is calculated using an average value of image data of a plurality of pixels obtained by the imaging means.

The image data of each color can be an average value.

[0014]

According to the constitution of the main feature of the present invention, when a color image is read by the image pickup means, image reading as preprocessing is performed, and the first extraction is performed based on the image data of each color obtained by the image pickup means at this time. Means for extracting first data indicating the magnitude of variation between the colors, and second extracting means for a predetermined one of the image data of each color.
The second data indicating the size difference of the image data is extracted, and for the image data of each color obtained by the imaging unit,
Correction by the color balance correction unit and the contrast correction unit is optimized based on the first data and the second data.

In particular, the first data is larger than the first threshold value while optimizing the color balance and the contrast.
The correction by the color balance correction means and the contrast correction means is prohibited by the first control means.
When the data is equal to or less than the first threshold value and the second data is equal to or less than the second threshold value , the correction by the color balance correction means is permitted by the second control means and the correction by the contrast correction means is prohibited. In addition to correcting the color balance when aiming for the collapse of the image, the correction of the contrast is also not performed, so that the aim can be further guaranteed, and in the case of a scene with low contrast, it will be extreme Such contrast correction can be prevented.

[0016]

When the first data is calculated using the maximum value or the minimum value of the image data of a plurality of pixels obtained by the image pickup means, it is possible to determine whether the image density is excessive or insufficient. , The maximum value is suitable for gain correction,
The minimum value is suitable for output range correction.

Further, even if the first data is calculated by using an average value of the image data of a plurality of pixels obtained by the imaging means, the color balance is determined to be the correction information by the contrast correction means. be able to.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings.

This embodiment shows a color image reading apparatus which reads an image on a color film. The image reading data is processed in various ways and input to an external device, for example, a digital copying machine. This is used when obtaining an image.

FIG. 1 shows a schematic configuration of the apparatus of this embodiment as viewed from the front. As shown in FIG. 1, a color CRT 2 for displaying a read image and performing various processing operations is provided on an upper portion of an apparatus main body 1 for reading an image and processing a signal.

The film 11 to be used for reading an image is held in the film carrier 3 and loaded on the trolley 61 shown in FIG. 1 in the direction of arrow a.
Is moved along with the film carrier 3 so that a predetermined frame of the film 11 can be positioned on a projection optical path for reading an image.

FIG. 2 shows a schematic configuration of the image reading apparatus when the apparatus main body 1 is viewed from above. The image reading apparatus according to the present embodiment includes a film 11 on which an image is read and a color CCD sensor 112 for reading a film image.
It adopts a two-dimensional line illumination system.

Therefore, in order to read data in the sub-scanning direction, the illumination section 113 and the first, second, and third mirrors 12, 13, and 14 reciprocate.

In FIG. 2, the illumination unit 113 and the first, second,
The third mirrors 12, 13, and 14 are shown by solid lines at the scanning start position.

The image reading apparatus of this embodiment also illuminates films 11 of different sizes, projects the transmitted light onto a predetermined size portion of a color CCD sensor 112,
In order to read an image by making use of the resolution of the CD sensor 112, the image forming magnification of the optical system on the color CCD sensor 112 is changed depending on the film size.

Specifically, in the case of a 35 mm film,
2.5050, × 0.947 for 6cm film
In the case of a 4, 4 × 5 inch film, it becomes × 0.5734. However, this means that the short side direction of the film 11 is a color CCD.
This is the case where the main scanning direction of the sensor 112 is set.

The optical magnification is changed by changing the conjugate length. Although this is publicly known and will not be described in detail, it is performed by changing the positions of the second and third mirrors 13 and 14, the imaging lens 15, and the lens rear-view mirrors 16 and 17.

The data scaling process differs from the optical magnification change in that the scanning speed is variable in the sub-scanning direction and electrical data processing is performed in the main scanning direction.

The relationship between the film 11 and the positions of the various components will be described. The second and third mirrors 13 and 14 are driven together by a stepping motor for conjugate length correction.

The position at the start of scanning for each film size is
As shown in the figure, the position of the solid line for a 35 mm film, the position of the dashed line for a 6 cm film, 4 × 5
In the case of an inch film, the position is indicated by a two-dot chain line.

As for the positioning control, the same position shown by a solid line in FIG. 2 may be used for a 35 mm film and a 6 cm film, and the position shown by a dashed line only for a 4 × 5 inch film.

The movement and position control of the imaging lens 15 are performed in the same manner as in the case of the mirror using a dedicated stepping motor (not shown).

The lens rearview mirrors 16 and 17 are 35 mm
For the film, the position shown by the solid line in FIG. 2 is set to cooperate with the lens back fixing mirror 18, and for the 6 cm film and the 4 × 5 inch film, the position is indicated by the dashed line and fixed. It works independently of the mirror 18.

For this reason, the lens back fixed mirror 18 used for reading an image on a 35 mm film is fixed at the position indicated by the solid line in FIG. The lens rearview mirrors 16 and 17 which are located in the optical path but reach the dash-dot line positions for reading 6 cm film and 4 × 5 inch film are out of the optical path.

The positions of the lens rear mirrors 16 and 17 are controlled by a dedicated stepping motor (not shown) in the same manner as the mirrors and the imaging lenses.

In front of the color CCD sensor 112, there is provided a filter section 25 on which four kinds of filters 21, 22, 23 and 24 are mounted.

The filter unit 25 is adapted to control the amount of light, R,
It has the function of adjusting the balance between G and B.

The filter 21 is a filter inserted at the time of actual operation of reading a negative film image.
B100 or the like is used.

The filter 22 is a filter inserted at the time of actual operation of reading an image on a positive film.
A D filter or the like is used.

The filter 23 is a filter inserted when the shading correction data of the negative film is taken in.

The filter 24 is a filter inserted when the shading correction data of the positive film is taken in.

The reason why the filter is divided between the actual operation and when the shading correction data is fetched is that there is no film when the shading correction data is fetched.
Since the film is present during the actual operation, the amount of light and the balance are different to correct this.

The filter switching operation of the filter section 25 is performed by a stepping motor (not shown) in the same manner as in the case of the mirror or the like.

As an auxiliary mechanism for this purpose, a sensor 26 for detecting the rightmost position and a sensor 27 for detecting the leftmost position of the filter section moving range are provided.

When the filter section 25 is provided in front of the color CCD sensor 112, the filters 21, 22, 23, and 24 have the minimum size substantially equal to that of the color CCD sensor 112 and are extremely small enough to provide a necessary margin. The filter unit 25 can be small.

Scanning for reading the film in the sub-scanning direction is performed by driving the illumination unit 113 and the first, second, and third mirrors 12, 13, and 14 by a scanning stepping motor (not shown).

The illuminating section 113 is composed of a replaceable lamp unit 41, an optical path turning mirror 42, a heat-insulating filter 43 shown in FIG. 3, and a lens 44 having a condensing surface and a diffusing surface on both sides. The film carrier 3 mounted on the trolley 61 located between the illumination unit 113 and the moving units of the first, second, and third mirrors 12, 13, and 14.
Illuminate the film 11 held in the
Of the color CCD sensor 1 by the imaging lens 15
12 to be imaged.

The folding mirror 42 is provided with a halogen lamp 45 which is set on the lamp unit 41 in a horizontal posture.
Is provided to guide the illumination light from the film to a film vertically arranged at a position higher than the lamp installation position.

The semi-cylindrical lens 44 is provided to improve the light-collecting property, and the diffusing surface is used to make the adhered dust and the like inconspicuous on the projected image.

The lamp unit 41 has a box shape as shown in FIG. 4, and a light emitting window 46 is provided on the upper surface. The light emitting window 46 opens when the lamp 45 is mounted,
A shutter 47 that closes when the lamp 45 is not mounted is provided.

As shown in FIGS. 4 and 5, the lamp unit 41 includes a reflector 48 for directing light from the lamp 45 to the light projecting window 46, a temperature fuse 49, and the lamp unit 41.
Short line 50 with the ground to determine the type of
When the lamp unit 41 is mounted on the apparatus main body 1, it has a connector 51 for making an electrical connection with the apparatus main body 1.

The short line 50 has a 2-bit code set in advance, and the CPU 200 shown in FIG.
From 06, data is fetched and identified.

The type of the lamp unit 41 is shown in FIG.
(A) equipped with a 35 mm film lamp 45a shown in FIG. 3 (b), equipped with a 6 cm film lamp 45b shown in FIG. 3 (b), and a 4 × 5 inch film lamp shown in FIG. There are three types with 45c, which are replaced as needed.

The lamps 45a to 45c are used for the film 1
The effective light-emitting portion 45d becomes longer as the size of the light-emitting portion 1 becomes larger.

By the way, if the lamps 45 are used in common, a large number of W lamps 45 are required, and power is unnecessarily consumed when projecting a small-sized film 11. This is particularly problematic when using a film 11 having a low tolerance for temperature.

By changing the type of the lamp 45 according to the size of the film 11 as described above, such a problem can be solved. However, each lamp 45a-4
5c is appropriately selected according to the size of the film 11,
Must be used.

In order to guarantee this, the type of the lamp unit 41 mounted on the apparatus main body 1 is automatically detected as described above, and a countermeasure is taken.

The film carrier 3 includes a film carrier 3a for a 4 × 5 inch film shown in FIG. 7A and a film carrier 3 for a 6 cm film shown in FIG.
b, a film carrier 3c for a 35 mm continuous film shown in FIG. 3C, and a film carrier 3d for a 35 mm mount film shown in FIG.

The film carrier 3b for a 6 cm film has a projection window 3e of 6 × 9 mm.
cm film size is 6 × 4.5, 6 × 6, 6 × 7,
It is designed to cope with various types of 6 × 9.

Each of the film carriers 3a to 3d is
The holding plates are opened and closed with the upper hinge connection portion as a fulcrum, so that the film 11 can be sandwiched and pulled out.

Each of the film carriers 3a to 3d has the same external dimensions, and the receiving conditions on the apparatus main body 1 side are unified to simplify the configuration on the apparatus main body 1 side and the operation of attaching and detaching them.

In each of the film carriers 3a to 3d, there is a distinction between those having different positions and the number of holes 61 for type detection and those having no holes 61. The type is detected optically.

In each of the film carriers 3a to 3d,
A set detection hole 62 for detecting an appropriate set position of the film carrier 3 is provided corresponding to each of the film projection windows 3e, and each of the film carriers 3a to 3d.
Can optically detect that the film 11 held by the camera is properly set on the projection optical path.

The trolley 61 which moves while holding the film carrier 3 includes the film carriers 3a to 3d.
Transmission type photo sensors 162, 1 for detecting the type of
63 and a transmissive photosensor 164 for detecting whether or not the film carriers 3a to 3d are mounted are built in such an arrangement as to sandwich the film carriers 3a to 3d mounted on the trolley 61.

Further, a transmission type photo sensor 165 for detecting the set state of each of the film carriers 3a to 3d mounted on the trolley 61 is provided at a position near the trolley 61 of the apparatus main body 1 where the trolley 61 moves. It is provided in such an arrangement as to sandwich it.

As shown in FIG. 9, the color CRT 2 includes a monitor display section 71 for displaying an image read from the film 11, setting a copy mode, and setting a trimming area.
An operation panel 72 for instructing a print operation and an internal panel 73 are provided.

The monitor display section 71 has the following display section and operation section.

Image display area 81: The read film image is displayed.

A message display section 82 displays necessary types of the lamp unit 41 and the type of the film carrier 3, displays a message indicating that shading correction data is being fetched, indicates that the film carrier is being pulled out, etc. Displays the type and output paper size.

Image adjustment button 83: When performing the image adjustment, by selecting this button 83 with the cursor, a submenu is displayed, and image adjustment such as color balance can be set.

Trimming button 84: Sets a trimming mode.

Enlarged continuous shooting button 85: An enlarged continuous shooting mode is set. By selecting this button, a submenu is displayed and the output size can be set.

Reduced continuous shooting button 86: A reduced continuous shooting mode is set.

Output confirmation button 87: Confirms the output for displaying the relationship between the image to be printed out and the paper.

Output size button 88: Specifies the paper size of the printer. By selecting this button, a submenu is displayed and the paper size can be set.

Reset button 89: Initializes the set copy mode.

The number display section 90 displays the number of prints.

The number setting unit 91 sets the number of prints.

Clear button 92: Clears the set number of prints.

The operation panel 72 has the following operation members.

Trackball 93: The cursor on the monitor display 71 is moved to the position of the displayed various processing buttons to select the necessary processing. The movement instruction of the cursor includes the movement amount in the X direction by the X direction pulse corresponding to the rotation direction and the rotation amount of the trackball 93,
This is performed by instructing the amount of movement in the Y direction by a direction pulse.

Trackball input key 94: An instruction signal for processing corresponding to the position of the cursor operated by the trackball 93 is input to the CPU 200.

A stop key 95 for giving an instruction to interrupt copying or image input;

An image input key 96 for instructing that a film image be read and displayed on the color CRT 2.

A print key 97 for giving an instruction to start copying.

Copy permission / prohibition display 98;
When the light is turned off, it indicates whether copying is permitted or prohibited.

The internal panel 73 has the following operation unit and display unit.

Destination code display section 101: Indicates destination.

The total counter 102 displays the total number of copies.

Serviceman key 103: Instructs the setting of the operation mode by the serviceman.

User key 104: instructs user choice mode setting.

Trouble reset key 105: Releases the internal trouble state.

CPU reset key 106; CPU
200 is reset by hardware.

Initial key 107: instructs initial setting.

FIG. 10 is a block diagram of a circuit diagram around the CPU 200. As shown in FIG. CPU 200 is a program RO
The entire device is controlled based on the contents of the program stored in M201.

The following components are connected around the CPU 200 by a CPU address bus and a CPU data bus.

EEPROM 202: stores parameters for adjusting the variation of each device. It is electrically readable and writable.

RAM 203: Stores variables necessary for executing the program.

Timer 204: A predetermined timer value is created from a clock signal according to the setting from CPU 200.

A communication port 205 for exchanging information with an external device;

A parallel I / O port 206 for outputting a control signal for controlling a peripheral device and for inputting a status signal of the peripheral device;

Input image memory 207; color CC
The image data read by the D sensor 112 is stored.

A table ROM 208 for storing necessary table information.

AGDC 210: The display of the color CRT 2 is controlled by controlling the contents of the VRAM 211.

The following are connected around the AGDC 210 by an AGDC bus and an AGDC data bus.

VRAM 211: stores data relating to display control of the color CRT 2.

Kanji ROM 212: Generates Kanji character data from Kanji codes.

Work RAM 213; VRAM 21
1 is used as a work area when controlling the contents.

The CPU address bus and the AGDC address bus, and the CPU data bus and the AGDC data bus are connected via the AGDC 210.

FIG. 11 shows an input / output section of a signal centered on the parallel I / O port 206. The scanner motor drive circuit 301, the filter drive circuit 302, the film carrier detection mechanism 303, and the cooling fans 304a, 304
b, lamp control circuit 305, lamp unit 41, lens drive circuit 306, operation panel 72, internal panel 73,
The track ball 93, the image processing circuit 307, and the mirror driving unit 308 are connected.

The scanner motor drive circuit 301 has a CPU
A circuit for moving the first, second, and third mirrors 12, 13, and 14, and the illumination unit 113 at a predetermined speed in accordance with an instruction from 200, and drives a scanner that enables them to move together. I do.

For safety measures, the maximum and minimum scan positions are detected to prevent a collision due to overscan in the event of an abnormality.

The scanner is controlled by the following signals.
Since it is known, the description is omitted.

Motor drive signal; Instructs the motor feed speed.

Forward / reverse rotation signal: indicates the direction of rotation of the motor.

A maximum scan position detection signal; indicates that the scanner is at the maximum scan position.

A minimum scan position detection signal; indicates that the scanner is at the minimum scan position.

Scan home position detection signal; indicates that the scanner is at the home position.

The filter driving circuit 302 drives the filter unit 25 so that the four types of filters 21 to 24 are switched according to the operation mode.

The filter section 25 is controlled by the following signals. The driving uses a stepping motor, and the positioning is performed by managing the number of driving steps from the signal of the reference position detection sensor.

-ON / OFF signal of the filter unit: Moves and stops the filter unit 25.

A forward / reverse rotation signal of the filter unit; the moving direction of the filter unit 25 is instructed.

The filter unit left limit position signal: indicates that the filter unit 25 is at the left limit position.

The right limit position signal of the filter unit; indicates that the filter unit 25 is at the right limit position.

The film carrier detection mechanism 303 detects the type of the film carriers 3a to 3d, detects the presence / absence of the film carrier 3, and detects the set state of the film carrier 3 at a specified position. The following signals are used. .

Carrier presence / absence detection signal; main unit 1
Indicates that the film carrier 3 is mounted.

Carrier set detection signal: Indicates whether the film carrier 3 is set at each normal projection position.

Film type detection signals 1 and 2; The type of the film 11 is determined by the difference between the film carriers 3a to 3d set by the combination of the photo sensor 61.

Here, Table 1 shows the combination of the film type detection signals 1 and 2 and the type of the film 11 designated thereby.

[0131]

[Table 1]

The lamp control circuit 305 controls the light quantity and lighting of the lamp 45. The DC voltage to be applied from the lamp control circuit 305 to the lamp 45 is
1 is supplied.

The signals used for this control are as follows.

An output voltage setting signal; a signal for setting an applied voltage to the lamp 45, which is given as a 5-bit signal.

Lamp on / off signal; lamp 45
Control of turning on / off of.

Abnormality detection signal: Detects abnormalities such as lamp burnout and abnormal lighting.

As the lamp unit 41, a lamp unit suitable for the type of the film 11 must be selected and used. For this reason, the lamp unit type detection signals 1 and 2 have been described. Signals by the short line 50 for detecting the type of the lamp unit 41 and the presence or absence of the lamp unit 41.

Is used.

Here, the lamp unit type detection signals 1, 2
Table 2 shows the relationship between the combination of the lamp unit 41 and the type of the lamp unit 41 and whether or not the lamp unit 41 is mounted.

[0140]

[Table 2]

The cooling fans 304a and 304b are operated so that the inside of the apparatus and the optical system do not become higher than a predetermined temperature, and are controlled by the following signals.

Cooling fans 1 and 2; cooling fan 30
4a and 304b are controlled on / off.

The lens driving circuit 305 includes the imaging lens 15
Is switched according to the size of the film 11 to be used. The lens position is controlled by the following signals. The driving uses a stepping motor, and the positioning is based on the management of the number of driving steps from the signal of the reference position detection sensor.

Driving signal: Controls driving and stopping of the lens driving motor.

Forward / reverse rotation signal; indicates the driving direction of the lens driving motor.

Position detection signal: Indicates that the lens is at the reference position.

The mirror driving section 307 changes the positions of the second and third mirrors 13 and 14 and the lens rear-view mirrors 16 and 17 in order to change the imaging magnification of the optical system according to the size of the film 11. .

The positions of the second and third mirrors 13 and 14 and the positions of the lens back mirrors 16 and 17 are controlled by the following signals. Each drive uses a stepping motor, and positioning is performed by managing the number of drive steps from the signal of each reference position sensor.

The second and third mirror drive signals for conjugate length correction: The second and third mirrors 13 and 14 are driven and stopped.

Position detection signal: Indicates that the second and third mirrors 13 and 14 are at the reference position.

Forward / reverse signal: Indicates the operation direction of each of the second and third mirrors 13 and 14.

Lens rear-mirror driving signal: The lens rear-mirrors 16 and 17 are driven and stopped.

Position detection signal: Indicates that the lens rearview mirrors 16 and 17 are at the reference position.

Forward / reverse signal: Instructs forward / reverse rotation of the lens rearview mirrors 16 and 17.

Although not shown, the image processing circuit transmits and receives the following signals to and from a copying machine separately from the communication line.

Power-on signal; indicates the power-on / off state of the printer unit.

Image data request signal: Indicates the image signal transmission timing.

Horizontal effective area signal: Indicates a printable area in the horizontal direction.

Vertical effective area signal: Indicates a printable area in the vertical direction.

Print wait signal: Indicates a state where image signals cannot be transmitted.

Selector switching signal: instructs switching of image signals in the image processing circuit.

By the way, the film 11 has a significantly different film transmission density depending on the type and photographing conditions.

FIG. 12 is a graph showing the relationship between the density (neutral color) of a photographed original on a 35 mm negative film and the transmission density of the film, and exposure conditions during photography are taken as parameters.

Various exposure conditions can be considered as -3 to +6 in the figure. For example, the standard exposure condition (= 0) when the exposure is changed (Lx.s) is taken. This shows data when the conditions are shifted up and down. As can be seen from the figure, the transmission density of the film greatly differs depending on the exposure conditions.

FIG. 13 is a graph showing the relationship between the density (neutral color) of a photographed original on a 35 mm positive film and the transmission density of the film, and exposure conditions during photography are taken as parameters.

The exposure conditions are indicated by -1 to +1.5 in the figure. As can be seen from the figure, the transmission density of the film differs greatly depending on the exposure conditions than in the case of the negative film.

FIGS. 14 to 16 show the density characteristics of R, G, and B according to the type of the negative film. The type of the negative film is, for example, Fujicolor SUPER HG10
0 (FIG. 14), Fujicolor SUPER HG400 (FIG. 15), and Fujicolor REALA (FIG. 16).

As can be seen from FIGS. 14 to 16,
In a normal use area, the balance of R, G, and B differs depending on the type of film.

FIGS. 17 and 18 show the R, G, and B sensitivity characteristics according to the type of the positive film. The type of the negative film is, for example, Fujichrome 50 (FIG. 1).
7) and Fujichrome 400 (FIG. 18).

As can be seen from FIGS. 17 and 18,
It can be seen that the balance of R, G, B is not as different as in the case of the positive film in the normal use area.

Therefore, in this embodiment, to read a color image on a color film, gain correction according to the difference in exposure conditions and R, G, and The gain is corrected in accordance with the difference in the sensitivity of B.

Data examples in which the exposure condition (-3 to +6) at the time of photographing is set using the output value after A / D conversion with respect to the density of the original photographed on the negative film as a parameter, and the gain is corrected and not corrected Are as shown in FIGS. 19 and 20.

As can be seen from these data, even though the exposure condition is quite wide, from -3 to +6, the exposure is not as good when the gain correction shown in FIG. 20 is performed as compared to the state without the gain correction shown in FIG. It can be seen that the difference due to the difference in the conditions has been sufficiently and appropriately corrected.

By the way, if there is no change in the density of the photographed original, it is considered that a scene with a low contrast is photographed. Therefore, if the above-described gain correction is performed uniformly when reading such an image, the contrast becomes extremely strong, and the intended output of the photographic document cannot be obtained.

In the case where the balance of R, G, and B is lost as in the case of a sunset, if the correction is performed uniformly, the output intended by the photographer cannot be obtained.

Therefore, in the case of the present embodiment, uniform correction of the gain is not performed, and the correction content is changed and adjusted.

[0177] Films other than the 35 mm film are mostly used by specialists. Therefore, there are many cases where images are taken under various unusual exposure conditions, and if this is automatically and uniformly corrected and standardized, it will deviate from the purpose of shooting.

In most cases, specialists also photograph positive films. Therefore, in this case, if the correction is automatically and uniformly performed, the aim of photographing is rather hindered.

Therefore, in these cases, the automatic correction is not performed in this embodiment.

FIG. 21 shows a case where the above correction is performed.
FIG. 3 shows a block diagram of image data processing based on the flow of image data.

The color CCD sensor 112 outputs color separation signals R, G, and B obtained by separating the transmitted light from the film 11 into R, G, and B components.

To explain the case of the color separation signal B as a representative, the color separation signal B is input to the video amplifier 401B. The video amplifier 401B has a function of amplifying a signal and can set the amplification factor from the outside.

The setting of the amplification factor from the outside can be freely performed by inputting the output of the D / A converter 402B connected to the data bus to the video amplifier 401B.

With the amplification factor set to a predetermined value, prescanning is performed prior to scanning for image reading, and the MAX value and MIN of the B component are determined based on the image data of the read predetermined number of pixels. The value is extracted.

An amplification value for setting the MAX value to a predetermined value in the video amplifier 401B is set based on the MAX value.

By such processing, it is possible to correct a difference in B sensitivity due to a difference in film type and to correct a difference in exposure conditions. Since the same applies to the color separation signals R and G, the description is omitted.

The color separation signal B output from the video amplifier 401B is input to an A / D converter 403B.
In the A / D converter 403B, in addition to the process of converting an analog signal to a digital signal, a shading correction process for correcting unevenness of an optical system, a variation in sensitivity of each dot of the color CCD sensor 112, and the like is executed.

In the shading correction, since the reference data read in advance is stored in the shading correction memory 404B, the correction data is read out in synchronization with the image data when the image data is fetched, and the data is read out through the D / A converter 405B. This can be achieved by inputting to the reference voltage input section of the / D converter 403B.

Since the shading correction processing is performed in the same manner for the color separation signals R and G, the description is omitted.

The color separation signals R, G, and B converted into digital signals as described above are input to the R / G / B registration processing unit 406. The R / G / B alignment processing unit 406 corrects the difference between the R, G, and B positions caused by the color CCD sensor 112.

In the reduction type color CCD sensor 112, 5000 pixels each of R, G, and B are usually arranged in a line at predetermined intervals.

Therefore, R,
In order to process the G and B component signals, a delay process for adjusting the position is required.

Outputs of the color separation signals R, G, and B from the R / G / B registration processing unit 406 are output to the LUT 407R,
The signals are input to the LUTs 407G and 407B, respectively.

Each LUT 407R, LUT 407G, LU
T407B individually performs a normalization process on each of the input color separation signals R, G, and B.

Although not shown, these LUTs 407
The R, LUT 407G, and LUT 407B are connected to the bus of the CPU 200, and have a configuration in which data can be rewritten in software.

Each LUT 407R, LUT 407G, LU
In T407B, a process of adjusting the contrast of the image while keeping the amplitude of the output data with respect to the input data constant is executed. In order to perform this processing, each LUT 4 is obtained by using the MIN values of the read data for each of the R, G, and B signals.
The contents of 07R, LUT 407G, and LUT 407B are changed so as to obtain an output amplitude of a predetermined width.

The video amplifiers 401R, 401G, 4
01B and the LUT 407R, LUT 407
By the processing in the G and LUT 407B, the correction processing based on the difference in the type of the film and the exposure condition can be executed without requiring a special memory.

These correction processes are not performed in the case of a positive film.
If the balance between the MAX and MIN values of G and B exceeds a predetermined range, and if the image has no contrast [when the data fluctuation width (difference between the MAX value and the MIN value) is small], the software is not executed. Control.

Thus, a special purpose when an expert takes a picture, a scene with low contrast, or R, G, B
It is possible to avoid a situation in which the characteristics when the landscape with the imbalanced image is photographed are obstructed.

Each LUT 407R, LUT 407G, LU
The output from T407B is input to a gamma correction / negative / positive inversion processing unit 408.

This gamma correction / negative / positive reversal processing section 4
In step 08, data correction processing based on the difference between negative and positive of the film 11 and gamma correction processing for adjusting the data of the portion input to the printer, that is, the reflectance of the original, to linear luminance data are performed. Will be

Gamma correction / negative / positive reversal processing section 408
Output signals R, G, and B are branched into a route to a color CRT2 system and a route to a printer unit of a digital color copying machine.

First, the output route to the printer will be described.

Gamma correction / negative / positive reversal processing unit 408
Is input to the color adjustment / color correction unit 409.

The color adjustment / color correction unit 409 provides feedback for color adjustment processing using the color CRT 2 and adjusts the output image data of the film reader to the input image data of the digital color copying machine. Correction processing is performed.

The output signals R, G, B from the color adjustment / color correction section 409 are input to the scaling / movement processing section 410.

The scaling / movement processing section 410 executes scaling / movement of image data in the main scanning direction.

Next, the route to the color CRT 2 will be described.

Gamma correction / negative / positive reversal processing section 408
Output signals R, G, B from the memory 411
R, 411G, and 411B, respectively.

Each memory 411R, 411G, 411B
Stores the read image signals R, G, and B for display on the color CRT 2.
It is configured to be readable from 200, and is also used when extracting data by the pre-scan described above.

Output signals R, G, and B from the memories 411R, 411G, and 411B are input to a color adjustment / color correction unit 412 for display on the color CRT 2, and output to the color CRT.
2 and a correction process for matching the film reading data with the data of the color CRT 2 that outputs the film reading data.

The output signals R, G, and B from the color adjustment / color correction unit 412 are input to a plane mix unit 413.
A process is performed to combine the image data with the data from the character plane memory 414 for characters used for mode setting and the like provided separately from the memory for image data.

Output signals R, G, and B from the plane mix unit 413 are supplied to a color C
It is output to RT2 as analog R, G, B signals.

The operation of the color image reading apparatus according to the present embodiment will be described below with reference to the flowchart shown in FIG.

FIG. 22 shows a main program for control by the CPU 200.

When the power is turned on and the program starts, system initialization such as resetting of the working RAM of the CPU 200 and peripheral devices is performed (step # 1).

Next, an initial screen for setting a copy mode is displayed on the color CRT 2 (step # 2). Then, shading correction is performed to initialize the color CCD sensor 112 used for image reading (step #)
3).

With the above processing, the preparation for reading an image is completed.

Thereafter, it is determined whether or not the image is being read based on whether or not the scan flag is 1 (step # 4). If the scan flag is 1, that is, if the image is being read, the process proceeds to step # 5, where the sub-scanning control and the image reading are performed. Control related to.

If the image is not being read in step # 4, the process proceeds to step # 9, in which a copy mode and a trimming range are set by performing cursor input processing according to the screen display of the color CRT 2.

After any of these processes, the process proceeds to step # 6, where the state of the film carrier is detected, and a film carrier process for controlling each element is performed.

Subsequently, at step # 7, the operation panel 72
A panel key input process for performing a process corresponding to the above key operation is executed. In step # 8, the result of the key operation on the operation panel 72, the copy mode setting on the color CRT 2 screen, and the copy progress status And the like are transmitted as necessary by communication processing with the printer.

By transferring the image read by the film scanner to the printer by the above processing, the film image can be printed out.

FIG. 23 shows an image reading control subroutine of step # 5 in FIG.

In the image reading control, control is performed for each scan mode specified by a key operation on the operation panel 72.

First, in step # 11, the scan mode is identified. If the mode is the pre-scan mode, the process proceeds to step # 12; if the mode is the image display mode, the process proceeds to step # 1.
Proceed to 6. If the mode is the image output mode, step # 20
Proceed to.

The case of the "pre-scan mode" will be described.

In the prescan mode, prescan control for reading the entire film image and storing the film image read data in the image input memory is performed (step #).
12) When the scanning is completed (Step # 13), a data analysis process for analyzing the stored film image data is performed (Step # 14).

Further, the scan mode is changed to the "image display mode" (step # 15), and the process ends.

That is, the reading conditions are changed in accordance with the analysis result of the image data read by pre-scanning, and the image is displayed.

The case of the "image display mode" will be described.

In the image display mode, the entire film image is read based on the reading conditions determined by the data analysis result even in the pre-scanning (step # 16), and the image is displayed on the color CRT 2 by the image display processing in step # 17. Display an image.

In the scan for displaying the image in step # 16, the R and R read by the color CCD sensor 112 are used.
Normalization of G and B data, and processing such as negative and positive inversion are performed and displayed on the color CRT 2.
The number of scans may be one.

When the scanning is completed (step # 1)
8) The scan flag indicating the end of the image reading is set to 0, and the process ends (step # 19).

The case of the "image output mode" will be described.

In the image output mode, a film image is read based on the “read start position”, “read end position”, “scan mode”, and “scan count” in the copy mode set on the screen of the color CRT 2 (step). # 20) In the magnification and movement processing in step # 21, processing such as magnification and movement of the image in the main scanning direction is performed.

In the image output scan control in step # 20, the R, G, and B read by the color CCD sensor 112 are read.
The data is transmitted to the printer unit, and R, G,
Color signals Y (yellow), M (magenta), C (cyan), K (black) for reproduction of an image read from B
Is performed, the number of scans is the number of output sheets × 4. In the case of reduced continuous shooting, the number is further doubled.

When the scan is completed (step # 2)
2) A scan flag indicating the end of image reading is set to 0, and the process ends.

With the above processing, control of the film scanner and image processing is performed for each scan mode, and the color CR is controlled.
An image can be displayed on T2 and an image can be output to the printer unit.

FIG. 24 shows a subroutine of the panel key input process in step # 7 in FIG.

In the panel key input processing, the operation panel 72
A process corresponding to the key operation on the upper and inner panels 73 is performed.

First, the scan flag is checked (step # 31), and it is determined whether or not the stop key has been pressed when the scan flag is $ 0, that is, during copying or scanning for image display (step # 42).

If the stop key has been pressed, the scan flag is set to 0 and the reading operation is terminated (step # 43).

If the scan flag is 0 in step # 31, the flow advances to step # 32 to perform a process corresponding to the type of the key.

The case where the "image input key" is operated will be described.

When the image input key is operated, step # 3 is performed.
Proceeding to 3, the scan flag for instructing the image reading operation is set to 1.

Next, whether the set film is negative or positive is determined based on the state of the negative flag (step # 34).

If the negative flag is 1, that is, if the film is a negative film, the scan mode is set to the "pre-scan mode" to change the reading conditions according to the film image data (step # 35). The scan mode is set to "image display mode" in order to directly display an image without performing pre-scan (step # 37).

Then, other image input key processing such as displaying a message on the image is performed (step # 36).

The case where the "print key" is operated will be described.

When the print key is operated, step # 3 is performed.
Proceeding to 8, the scan flag for instructing the image reading operation is set to 1.

Then, the scan mode is set to "image output mode" in order to output the R, G, B signals of the read image to the printer (step # 39).

Further, other print key processing such as displaying a message on the screen of the color CRT 2 is performed (step # 40).

The operation on the “internal panel 73” will be described.

If the pressed key is an internal panel key, the flow advances to step # 41 to perform key processing corresponding to each key.

With the above processing, processing corresponding to the keys on the operation panel 72 and the internal panel 73 is performed, so that image reading and image output processing can be performed. If the stop key is operated, the process returns.

FIG. 25 shows a data analysis processing subroutine of step # 14 in FIG.

Here, various analysis processes are performed on the data stored in the image memory.

First, in the subroutine of step # 51,
A MAX value and a MIN value are detected from the captured data for one screen.

In the subroutine of step # 52,
The presence or absence of a film is detected from the read data.

In the subroutine of step # 53, a correction process for normalizing the read data is performed.

FIG. 26 shows the MAX value / MIN value detection processing subroutine of step # 51 in FIG.

First, in step # 61, initial values are set, and the maximum value of data is set to each of the R, G, and B MAX values, and the maximum value of data is set to each of the R, G, and B MIN values. Enter it.

Next, a process of fetching data at a predetermined address is performed (step # 62), and a count-up process of read addresses is performed (step # 63).
In this embodiment, the number of data sampling is set to 1/8 of all pixels.

First, the R data is compared with the current R MAX value (step # 64).
If the value is larger than the X value, the process proceeds to step # 65, where R MA
After updating the X value to the data value, the process proceeds to step # 66, where R
If not greater than the MAX value of step # 66
Move to

In step # 66, R data and R MIN
Then, if the R data is smaller than the MIN value of R, the process goes to step # 67 to change the MIN value of R to R.
After updating to the data value, the process proceeds to step # 68, and if the R data is not smaller than the MIN value of R, the process directly proceeds to step # 68.

In the subroutine of step # 68, G data is used. In the subroutine of step # 69, B data is used.
The same processing is performed for the data as for the R data.

At step # 70, it is determined whether or not sampling for one screen has been completed based on the address value. If not completed, the process returns to step # 62 to repeat the above-mentioned processing. End the routine.

FIG. 27 shows a subroutine of the normalization correction processing in step # 53 in FIG.

First, at step # 81, it is checked whether the negative flag is 1. If it is not 1, the flow shifts to step # 82 to set initial values to the gain adjustment value and LUT data.

If the negative flag is 1, the flow shifts to step # 83. The processing of steps # 83 to # 90 is to derive the maximum value and the minimum value from each MAX value extracted from the read R, G, and B data to balance R, G, and B, and determine the difference between them. It is determined whether or not to execute the correction process even in the case of a negative film based on whether the value exceeds the value.

If it exceeds the predetermined value, no correction processing is performed.

First, in step # 83, the magnitude relationship between the MAX value of R and the MAX value of G is determined. If the MAX value of R is larger, the flow shifts to step # 84 to set the MAX value of R to α. Substitute the MAX value of G for β.

If the MAX value of G is larger, the flow shifts to step # 85, where α is the MAX value of G and β is the MA value of R.
The X value is substituted for each.

Next, at step # 86, the MAX value of B and α
The magnitude relationship with the value of is determined. If the MAX value of B is larger, the process proceeds to step # 87, and the MAX value of B is substituted for α. Here, the maximum value of each of the R, G, and B MAX values is stored in α.

After this processing, or in step #
If the value of α is larger at 86, the process directly proceeds to step # 88.

In step # 88, the magnitude relationship between the MAX value of B and the value of β is determined, and if the MAX value of B is smaller, the flow shifts to step # 89 to substitute the MAX value of B for β. Here, β stores the minimum value of each of the R, G, and B MAX values.

After this processing, or in step #
If the value of β is smaller at 88, the process directly proceeds to step # 90, and it is determined whether or not the difference between the value of α and the value of β is larger than a predetermined value 1.

That is, it is determined whether or not the difference between the maximum value and the minimum value of each of the R, G, and B MAX values exceeds a predetermined value 1.

If the difference exceeds the predetermined value 1, step # 9
The process proceeds to 1 to set an initial value to a gain adjustment value and LUT data, and terminates the present subroutine.

In this embodiment, the discrimination is made based on the MAX value.
Similar processing can be performed using an average value, a MIN value, and the like.

If the difference does not exceed the predetermined value, the flow shifts to step # 92 to determine whether or not the difference between the MAX value and the MIN value of R is smaller than the predetermined value 2, that is, the amplitude of the read data is smaller than the predetermined value 2. It is determined whether it is below.

This is because if the original data has a small amplitude and the LUT correction processing is executed, the contrast will be extremely increased and the output will be uncomfortable, so that the processing is not executed. To However, the correction process of the gain adjustment unit is executed because there is no problem.

If the amplitude is smaller than the predetermined value 2, the flow goes to step # 93 to execute the gain adjusting section correction processing subroutine, and then the initial value is set in the LUT data (step # 94). End the subroutine.

When the amplitude exceeds a predetermined value 2,
After executing the gain adjustment unit correction processing subroutine in step # 95, the subroutine is executed by executing the LUT correction processing subroutine in step # 96.

It should be noted that the determination method in step # 92 is not limited to the method of the present embodiment, but may be other similar processing.

FIG. 28 shows a subroutine for the gain adjusting section correction processing in step # 95 in FIG.

A description will be given of the case of the R signal as an example. At the time of the initial adjustment, the adjustment using the reference film
The gain of the R line at this time is referred to as an “initial R gain”.

The MA of R extracted from the read data
The X value is a value obtained by the above “initial R gain”.

In this processing, the gain is corrected so that the MAX value of R becomes the reference MAX value. That is, "initial R gain"
It is necessary to correct the gain to a multiple of the ratio of (reference MAX value / MAX value of R).

For this reason, in step # 101, assuming that the corrected gain is RG, (reference MAX value / MAX of R
Value) × (initial R gain) is given to RG.

G and B signals are processed in the same way (steps # 102 and # 103).

FIG. 29 shows the LUT correction processing subroutine of step # 96 in FIG.

Description will be made by taking the case of the R signal as an example. The initial LUT stores initial data of the characteristics shown in FIG.

Since x has a relationship with an input value (address value) and y has a relationship with an output value (data value), the output is amplified by (reference MAX value / MAX value of R) by correction of gain adjustment. Of course, the R MIN value data extracted at the time is also (R MIN value) × (reference MAX value / M of R) after correction.
AX value).

In step # 111, the value of (the MIN value of R) × (the reference MAX value / the MAX value of R) is calculated and substituted into C.

Then, in step # 112,

[0298]

(Equation 1)

The contents of the LUT are rewritten by the function of FIG. 31 shows the rewritten data characteristics of the LUT after correction.

Although only the R signal is shown in FIG. 29, the same processing is performed for each of the G and B signal lines, and this subroutine ends.

By the above processing, the MAX values of the R, G, and B image data are aligned, and at the same time, the balance between the data is obtained, and the widths of the R, G, and B image data are also aligned. While correcting the variation due to the difference in the type of the film, it is possible to avoid the characteristic of the photographer's aim and the captured scene from being spoiled.

FIG. 32 shows the film carrier processing subroutine of step # 6 in FIG.

In this subroutine, the lamp unit 41
The film carrier 3 determines whether the initial state is set to negative or positive.

First, in step # 121, the size of the lamp unit is identified, and the processing is divided depending on the determination.

If it is determined in step # 121 that the lamp unit 41 is for a 35 mm film, the type of the film carrier 3 set in step # 122 is determined, and the type of the film carrier 3 is determined. If it is determined that there is, the process proceeds to step # 123, and it is determined whether or not the default has been rewritten.

If it is determined in step # 123 that there is no default rewriting, the process proceeds to step # 131.
Then, the process of setting the negative state, that is, the process of setting the negative flag = 1, is performed, and the subroutine is terminated.

If it is determined in step # 123 that there is a default rewrite, it is determined in step # 124 whether or not it is negative. If it is negative, step # 131 is performed.
Then, the process proceeds to step # 132, and if not negative, the process proceeds to step # 132, where the process of setting the positive status, that is, the process of setting the negative flag to 0, is performed.

If the film carrier 3 set in step # 122 is for mounting, the flow shifts to step # 125 to determine whether or not default rewriting has been performed.

If it is determined that there is no default rewriting, the flow directly proceeds to step # 132 to perform a positive state setting process, and the present subroutine is terminated.

If there is a default rewrite in step # 125, the process proceeds to step # 126 to determine whether or not it is negative. If it is negative, a negative state setting process is performed in step # 131, and the process proceeds to step # 131. If not, the process in the positive state is performed in step # 132, and the subroutine ends after any of them.

If the lamp unit 41 is for a 6 cm film in step # 121, the flow shifts to step # 127 to determine whether or not the default rewriting has been performed.

[0312] If there is no default rewriting, the flow shifts to step # 132 to perform a positive state setting process, and ends this subroutine.

If there is a default rewrite, the flow shifts to step # 128 to determine whether or not the data is negative.

If negative, a negative state is set at step # 131, and if not, step #
At 132, a positive state is set, and the subroutine is terminated after any of them.

If the lamp unit 41 set in step # 121 is for a 4 × 5 inch film, the flow shifts to step # 129 to determine whether or not default rewriting has been performed.

If there is no default rewriting, the flow directly proceeds to step # 132 to perform a positive state setting process, and the present subroutine ends.

If there is a default rewrite, the flow shifts to step # 130 to determine whether or not the rewrite is negative.

If negative, the process proceeds to step # 131 to perform a negative state setting process. If not, the process proceeds to step # 132 to perform a positive state setting process. finish.

[0319]

According to the main feature of the present invention, in particular, when the first data is larger than the first threshold value while optimizing the color balance and the contrast, the first control means controls the color balance correction means and the contrast. The correction by the correction means is prohibited and the first data is equal to or less than the first threshold.
Below , when the second data is equal to or less than the second threshold , the second control means permits the correction by the color balance correction means,
Since the correction by the contrast correction unit is prohibited,
In addition to correcting the color balance when aiming for color balance collapse such as sunsets, the correction of contrast is also not performed, so that the aim can be further guaranteed, and in the case of scenes with weak contrast, etc. It is possible to prevent the contrast from being corrected so as to make it extreme.

[0320]

[0321]

When the first data is calculated using the maximum value or the minimum value of the image data of a plurality of pixels obtained by the imaging means, it is possible to determine whether the density of the image is excessive or insufficient. , The maximum value is suitable for gain correction,
The minimum value is suitable for output range correction.

Further, even if the first data is calculated by using the average value of the image data of a plurality of pixels obtained by the image pickup means, the color balance is determined to be the correction information by the contrast correction means. be able to.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a color image reading apparatus according to an embodiment of the present invention as viewed from the front.

FIG. 2 is a schematic configuration diagram of the apparatus main body viewed from above.

FIG. 3 is a side view illustrating a schematic configuration of a lighting unit.

FIG. 4 is a perspective view of a lamp unit.

FIG. 5 is a conceptual diagram showing an internal configuration of a lamp unit.

FIG. 6 is a diagram showing types of lamps.

FIG. 7 is a front view of a film carrier.

FIG. 8 is a front view of a film carrier type detection unit.

FIG. 9 is a front view showing a color CRT, an operation panel, and an inner panel.

FIG. 10 is a block diagram of a CPU and its peripheral devices.

FIG. 11 is a block diagram of a parallel I / O and a circuit connected to the parallel I / O.

FIG. 12 is a graph showing the relationship between the density of a document photographed on a negative film and the film transmission density.

FIG. 13 is a graph showing the relationship between the density of a document photographed on a positive film and the film transmission density.

FIG. 14 is a graph showing the relationship between exposure conditions and R, G, and B densities in the case of a Fujicolor SUPER HG100 film.

FIG. 15 is a graph showing the relationship between exposure conditions and R, G, and B densities in the case of a Fujicolor SUPER HG400 film.

FIG. 16 is a graph showing the relationship between exposure conditions and R, G, and B densities in the case of a Fujicolor REALA film.

FIG. 17 is a graph showing the relationship between exposure conditions and R, G, and B densities in the case of a Fujichrome 50 Professional positive film.

FIG. 18 is a graph showing a relationship between exposure conditions and R, G, and B densities in the case of a positive film of Fujichrome 400 Professional.

FIG. 19 is a graph showing the relationship between the density of a captured original and the data after A / D conversion without gain correction in the case of a negative film.

FIG. 20 is a graph showing the relationship between the density of a photographed original and the data after gain-corrected A / D conversion in the case of a negative film.

FIG. 21 shows R, G, and R read by a color CCD sensor.
It is a block diagram which shows the flow of a process of each B signal.

FIG. 22 is a flowchart of a main routine showing main control of a CPU.

FIG. 23 is a flowchart of an image reading control subroutine.

FIG. 24 is a flowchart of a panel key input processing subroutine.

FIG. 25 is a flowchart of a data analysis processing subroutine.

FIG. 26 is a flowchart of a MAX value / MIN value detection processing subroutine.

FIG. 27 is a flowchart of a normalization correction processing subroutine.

FIG. 28 is a flowchart of a gain adjustment unit correction processing subroutine.

FIG. 29 is a flowchart of an LUT correction processing subroutine.

FIG. 30 is a graph showing characteristics of initial data used in the LUT correction processing.

FIG. 31 is a graph showing characteristics of data after being corrected in the LUT correction processing.

FIG. 32 is a flowchart of a film carrier processing subroutine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Apparatus main body 2 Color CRT 113 Illumination part 12-14, 16-18 Mirror 15 Imaging lens 112 Color CCD sensor 200 CPU 401R, 401G, 401B Video amplifier 402R, 402G, 402B D / A converter 407R, 407G, 407B LUT

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Kenichi Muroki 2-3-113 Azuchicho, Chuo-ku, Osaka City Osaka International Building Minolta Camera Co., Ltd. (56) References JP-A-1-151376 (JP, A JP-A-58-9144 (JP, A) JP-A-1-213073 (JP, A) JP-A-64-60151 (JP, A) JP-A-64-12766 (JP, A) JP-A-2- 295393 (JP, A) JP-A-2-288697 (JP, A) JP-A-1-252067 (JP, A) JP-A-1-169683 (JP, A) Tokuyo 62-500756 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) H04N 1 / 04,1 / 46,1 / 60

Claims (3)

(57) [Claims] An imaging unit that reads a color image and obtains color-separated image data of each color; and a color balance correction unit that performs color balance correction on the image data of each color obtained by the imaging unit. A contrast correction means for correcting contrast of the image data obtained by the imaging means; and first data indicating the magnitude of variation between the colors based on the image data of each color obtained by the imaging means. a first extracting means for extracting, from among the image data of each color obtained by said image pickup means, a predetermined
Second extraction means for extracting second data indicating a magnitude difference of image data for one color, and when the first data is larger than a first threshold , prohibits correction by the color balance correction means and the contrast correction means. A first control unit that performs the correction by the color balance correction unit and prohibits the correction by the contrast correction unit when the first data is equal to or less than a first threshold and the second data is equal to or less than a second threshold. And a second control unit. 2. The color image reading device according to claim 1, wherein the first data is calculated using a maximum value or a minimum value of image data of a plurality of pixels obtained by the imaging unit. 3. The color image reading device according to claim 1, wherein the first data is calculated using an average value of image data of a plurality of pixels obtained by the imaging unit.