JP2009010924A - Image reading apparatus, image forming apparatus, and method of incorporating same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform normal color correction even when there is variation in an output level of a reading part between a state of the reading part at the time color correction parameter is generated and a state of the same when it is assembled in the image reading apparatus. <P>SOLUTION: The image reading apparatus includes a reading part 103 for reading images; and an image processing part for processing image data yielded from the reading part, whereby it outputs image data processed in the image processing part. In the apparatus, a grey balance adjusting circuit 204 has correction coefficients, for every color, that are generated with a function OFF of a color correction circuit 205 such that an output of an adjusting original gets a predetermined value. Further, a correction parameter of the color correction circuit 205 is generated for every individual, and when the reading part 103 is incorporated into an image reading apparatus 301, the function of the color correction circuit 205 is turned OFF to readjust the grey balance adjusting circuit 204. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an image reading apparatus that reads a document and generates image data, an image forming apparatus including the image reading apparatus, and a method for incorporating a reading unit into the image reading apparatus.

FIG. 1 is an explanatory diagram showing a conceptual configuration of the image reading apparatus. As can be seen from FIG. 1, the image reading apparatus reads an image by moving the original 101 between the reference white plate 102 and the reading unit 103. However, the output level of the reading unit 103 varies depending on the following conditions.
1. 1. Concentration of reference white plate 102 2. Distance between reading unit 103 and reference white plate 102 Variation in spectral characteristics of various components inside the reading unit 103

  The output level of the reading unit 103 at the time of reading a color original affects the output level uniformly for RGB depending on the above conditions 1 and 2. As a result, the brightness may change even if the hue of the image is the same. Further, depending on the above condition 3, even when the same color original is read, the ratio of RGB values may be different. As a result, the hue and brightness of the image may change.

  In order to eliminate the effects of 1 and 2, it is only necessary to have individual coefficients for Red / Green / Blue and adjust the individual coefficients so that the RGB values determined in advance when the reference document is read are obtained. . In order to eliminate the above effect 3, color correction may be performed by generating color correction parameters for color correction from RGB values obtained by reading a plurality of color originals.

  On the other hand, as this type of technology, conventionally, for example, the inventions described in Patent Documents 1 to 3 are known. Among these, Patent Document 1 discloses image information optically read from a document in order to optimize the reading level so that the difference between the reading level of the SDF and the pressure plate (the output level of the read image data) becomes small. A photoelectric conversion means for converting the analog signal into an analog electrical signal, a reading optical means for irradiating the original with illumination light and guiding reflected light to the photoelectric conversion means, the analog signal converted by the photoelectric conversion means is sampled, and gain is obtained. An analog signal processing means capable of adjustment; and an analog / digital conversion means for converting the analog signal processed by the analog signal processing means into a digital signal, and the reading optical means fixed with a moving document First reading mode for reading and first reading mode by reading optical means for moving a fixed document. In the image reading apparatus in which the reading mode is set, the output level is corrected so that the output level of the image data read from the document becomes optimum in each of the first reading mode and the second reading mode. An image reading apparatus provided with a correcting unit is disclosed.

  Further, Patent Document 2 discloses a standard for making it possible to appropriately correct a variation in the spectral sensitivity of a scanner caused by a light source, a color filter, and the like, and a reading error caused by this, and obtain a certain color reproduction. A measurement value obtained by measuring a document with a predetermined measuring instrument or a characteristic value of the reference document, and a statistic calculated by analyzing an image signal value obtained by reading the reference document with an image reader. The spectral sensitivity characteristic of the image reading device is estimated, an input color correction parameter is created from the estimated spectral sensitivity characteristic, and an image of the original image read by the image reading device is generated using the input color correction parameter. A color correction method for correcting a signal is disclosed.

Furthermore, in Patent Document 3, without causing an error caused by the characteristics of the document reading unit when a plurality of types of image signals read under a plurality of different reading conditions are corrected from the difference between the set reading light amounts, The original image is different in terms of the amount of light so that differences in image signals (image density data) due to differences in reading conditions can be suitably absorbed and the signal levels of the image signals in each reading condition can be matched. The image characteristic value of the original image is obtained for each of the reading conditions from the image signal read photoelectrically under the reading conditions, and the image characteristic value obtained under the reading conditions is used. An image reading method that absorbs a difference in signal level of the image signal under each reading condition and matches the signal level of the image signal under each reading condition is disclosed. To have.
JP 2004-104239 A JP 2000-059637 A JP 2000-216997 A

  By the way, in the image reading apparatus shown in FIG. 1, in order to eliminate the effects 1 to 3, the respective corrections may be performed.

  However, an image reading apparatus having a color correction circuit inside the reading unit and generating a color correction parameter for color correction before the reading unit is incorporated into the image reading apparatus and then incorporating the reading unit into the image reading apparatus. Therefore, the output level of the input side circuit of the color correction circuit varies depending on the density of the reference white plate and the difference in the distance between the reading unit and the reference white plate when the color correction parameter is generated and when it is incorporated in the image reading apparatus. Normal color correction cannot be performed.

  The inventions described in Patent Documents 1 to 3 cannot cope with the correction of the output level of the input side circuit of the color correction circuit.

  The present invention has been made in view of the above, and even when there is a variation in the output level of the reading unit for each image reading device between the generation of the color correction parameter and the state incorporated in the image reading device, the normal color An object of the present invention is to provide an image reading apparatus capable of performing correction, an image forming apparatus, and a method for incorporating a reading unit.

  In order to solve the above-described problems and achieve the object, the present invention provides an image reading apparatus, a reading unit that reads a document and outputs image data, and image processing of image data output from the reading unit An image processing unit that performs irradiation, and the reading unit irradiates the original with irradiation light, and reflects the irradiation light reflected from the original, and an image read from the incident reflected light. A conversion unit that generates digital data of a signal, an adjustment unit that adjusts an output level of the digital data based on a correction coefficient for each color, and an adjustment based on a color correction parameter that has a different value for each image reading device A color correction unit that executes a color correction process that corrects later variations in the output level, and the correction coefficient is set before the reading unit is incorporated into the image reading apparatus. The color correction process is performed when the reading unit is incorporated in the image reading apparatus after the output level when the original is read in a state where the color correction process is not performed is generated to be a predetermined value. It is adjusted in the state which does not execute.

  The present invention is also an image forming apparatus, comprising: a reading unit that reads a document and outputs image data; and an image processing unit that performs image processing on the image data output from the reading unit, An optical unit configured to irradiate the original with irradiation light and to receive reflected light of the irradiation light from the original; a conversion unit that generates digital data of an image signal read from the incident reflected light; An adjustment unit that adjusts an output level of digital data based on a correction coefficient for each color, and a color correction that corrects variations in the output level after adjustment based on a color correction parameter having a different value for each image forming apparatus A color correction unit that executes processing, and the correction coefficient reads the original in a state where the color correction processing is not executed before the reading unit is incorporated into the image forming apparatus. And the output level is adjusted so that the color correction processing is not executed when the reading unit is incorporated into the image forming apparatus. Features.

  Further, the present invention irradiates the original with irradiation light, makes the reflected light of the irradiation light incident from the original, generates digital data of an image signal read from the incident reflected light, and outputs the digital data A reading unit that adjusts a level based on a correction coefficient for each color and performs color correction processing for correcting variations in the output level after adjustment based on a color correction parameter having a different value for each image reading device; An assembling method for embedding, wherein the correction coefficient is set so that the output level when the original is read in a state in which the color correction processing is not performed before the reading unit is incorporated in the image reading device. A first generation step of generating the color correction parameter, a second generation step of generating the color correction parameter for each of the image reading devices, and reading the image by the reading unit. And embedded step of incorporating the location, when incorporating the reading portion to the image reading apparatus, characterized by comprising a an adjustment step of adjusting said correction coefficient in a state that does not perform the color correction processing.

  According to the present invention, when the reading unit is incorporated in the image reading device, the correction coefficient is adjusted even when there is a variation in the output level of the reading unit for each image reading device, so that normal color correction can be performed. Play.

  Exemplary embodiments of an image reading apparatus, an image forming apparatus, and an assembling method according to the present invention are explained in detail below with reference to the accompanying drawings.

(Embodiment 1)
The conceptual configuration of the image reading apparatus according to the first embodiment is the same as that of the conventional conceptual configuration illustrated in FIG. 1. In the image reading apparatus, the document 101 moves between the reference white plate 102 and the reading unit 103. The image is read. FIG. 2 is a block diagram illustrating an example of the configuration of the reading unit 103 of the image reading apparatus according to the present embodiment. 2, the reading unit 103 includes an optical unit 201, a signal processing unit 202, a shading correction circuit 203, a gray balance adjustment circuit 204, and a color correction circuit 205.

  The optical unit 201 includes a photoelectric conversion element that detects incident light and converts the incident light into an analog image signal by the photoelectric conversion element. The converted analog image signal is input to the signal processing unit 202.

  FIG. 3 is a block diagram illustrating a configuration of the signal processing unit 203. The signal processing unit 202 includes a clamp circuit 601, a sample hold circuit 602, a programmable gain amplifier 603, and an AD converter 604. The analog image signal input to the signal processing unit 202 clamps the analog image signal after AC coupling by the clamp circuit 601 to the internal reference potential of the signal processing unit 202. The clamped analog image signal is sampled by the sample hold circuit 602 by a sample pulse which is one of the signal processing unit drive signals, and the level is held. After maintaining the level, the signal is converted into a continuous analog image signal, amplified by a programmable gain amplifier 603 to a predetermined amplification factor, and converted into digital data by an AD converter 604.

In the digital data, the shading correction circuit 203 corrects uneven sensitivity for each pixel of the photoelectric conversion element in the optical unit 201, variation in the amount of transmitted light through the lens, unevenness and deterioration of the illumination / optical system. Specifically, the reference white plate 102 is illuminated prior to actual document reading, and the reflected light is read and acquired as white level reference data for shading correction of each pixel. The acquired reference data is used as shading correction data (D _sh ), and the output data (D _out ) using the read data (D _in ) read is expressed by equation (1).
D _out = D _in / D _sh × (2 ⁿ −1) (1)
Here, D _in : pre-shading image data, D _sh : shading data, and n: number of bits (for example, n = 10) are shown.

  The gray balance adjustment circuit 204 has correction coefficients (Rref, Gref, Bref) separately for Red, Green, and Blue so that the output of the adjustment document has a predetermined value, and the value of the output data is determined by the correction coefficient. Adjust (output level). When acquiring as white level reference data for shading correction of each pixel, the function of the color correction circuit 205 is set to OFF and the color correction process is not executed.

As a calculation example, calculation expressions when performed together with the shading calculation are as shown in Expressions (2) to (4).
D _out (R) = D _in / D _sh × (2 ⁿ −1) × (2 ⁿ + Rref) / 2 ⁿ ) (2)
D _out (G) = D _in / D _sh × (2 ⁿ −1) × (2 ⁿ + Gref) / 2 ⁿ ) (3)
D _out (B) = D _in / D _sh × (2 ⁿ −1) × (2 ⁿ + Bref) / 2 ⁿ ) (4)

That is, the gray balance adjustment circuit 204 performs the following calculation in the equations (2) to (4).
^{"× (2 n + Rref) /} 2 n "
“× (2 ⁿ + Gref) / 2 ⁿ ”
“× (2 ⁿ + Bref) / 2 ⁿ ”

Further, the correction coefficients (Rref, Gref, Bref) are calculated according to the following formulas (5) to (7), and the levels of the output data D _out (R), D _out (G), D _out (B) are predetermined values. Is calculated to be

Rref = 2 ⁿ × D target value of _{out (R)) / D out} (R) for the current value -2 ⁿ ··· (5)
Gref = 2 ⁿ × target value of D _out (G)) / current value of D _out (R) −2 ⁿ (6)
Bref = 2 ⁿ × target value of D _out (B)) / current value of D _out (R) −2 ⁿ (7)

  In the generation of the correction coefficient according to the equations (5) to (7), first, the color correction function of the color correction circuit 205 is turned off, for example, at the time of factory shipment before the reading unit 103 is incorporated into the image reading device 303. Done. In addition, when the reading unit 103 is incorporated into the image reading apparatus 301, the color correction function of the color correction circuit 205 is turned off, thereby adjusting the correction coefficient generated before the incorporation. become.

  The color correction circuit 205 has a color correction parameter for each reading unit 103 in order to correct an output difference caused by the spectral characteristics of the optical unit 201.

  FIG. 4 is a block diagram showing an example of the configuration of an image reading apparatus in which such a reading unit 103 is incorporated. In FIG. 1, an image reading apparatus 301 includes a reading unit 103, an image processing unit 302 that performs a series of image processing of a scanner image, and an output unit 303 that performs rearrangement of output image data, voltage level conversion, and the like. Image data from the image reading apparatus 301 is output as a print image by the printer unit 304, and the image reading apparatuses 301 and 304 constitute an image forming apparatus, here a copying machine.

  For example, when the reading unit 103 and the image reading device 301 are manufactured at different locations, the adjustment of the present invention when the color correction parameters of the color correction circuit 205 inside the reading unit 103 are generated when the reading unit 103 is manufactured. The process will be described below.

  The distance between the density reading unit 103 of the reference white plate 102 and the reference white plate 102 when the color correction parameter is generated by the reading unit 103 is different from that when the reading unit 103 is incorporated in the image reading device 301. When the distance is different, the output data value (output level) of the input stage of the color correction circuit 205 is also different. Therefore, the color correction function of the color correction circuit 205 is set to OFF, and the reference original which is an adjustment original The reading unit 103 is incorporated in the image reading device 301 with the correction coefficients of Rref, Gref, and Bref of the gray balance adjustment circuit 204 according to the expressions (5) to (7) so that the read value becomes a predetermined value. Regenerate with state. As the reference document at this time, it is preferable to use the same document as the adjustment document used when the correction coefficient was generated before the reading unit 103 was incorporated.

  As described above, in the present exemplary embodiment, the correction unit for Rref, Gref, and Bref of the gray balance adjustment circuit 204 is regenerated in a state where the reading unit 103 is incorporated in the image reading device 301, thereby the reading unit 103 and the image reading device. Even when 301 is manufactured in another place, the value of the output data from the preceding gray balance circuit 204 input to the color correction circuit 205 can be made the same.

(Embodiment 2)
FIG. 5 is a block diagram illustrating a configuration of the reading unit 503 according to the second embodiment. In the second embodiment, an average position control circuit 701 for obtaining an average value of a designated position range in the main scanning direction of the document is connected to the gray balance adjustment circuit 204 for the reading unit in FIG. Yes. The configuration other than the average position control circuit 701 is the same as that of the first embodiment. In the present embodiment, the average value of the reference document (adjustment document) of the gray balance adjustment circuit 204 is set by setting the average value of the designated position range in the main scanning direction of the document to the average position control circuit 701. Specify the position to calculate. This makes it possible to always generate the correction coefficient based on the average value at the same main scanning pixel position.

(Embodiment 3)
The image reading apparatus 801 according to the third embodiment adjusts the correction coefficient when the reading unit 103 is incorporated in the image reading apparatus 301 and performs an average value of the reference original (adjustment original) by the image reading apparatus 301 itself. .

  FIG. 6 is a block diagram illustrating a configuration of the image reading apparatus according to the third embodiment. As shown in FIG. 6, the image reading apparatus 801 according to the present embodiment mainly includes a reading unit 103, an image processing unit 302, a load 801, a sensor group 820, and an operation unit 800. Here, the configuration of the reading unit 103 is the same as that of the second embodiment shown in FIG.

  The image processing unit 302 mainly includes a control block 700 that controls the image reading apparatus 301 and an image processing block 750 that performs image processing on the image data read by the reading unit 103.

The control block 700 is generated by the control unit 710 that controls the entire image reading apparatus 301, the gate generation unit 720 that generates a gate signal in a range instructed by the operator from the operation unit 800, and the gate generation unit 720. The gate control unit 730 captures image data (output data) D _out [9: 0] read by the reading unit 103 only during the averaging gate period.

  The control unit 710 further includes a CPU 711 that executes various processing programs, a ROM 712 that stores programs executed by the CPU 711, a RAM 713 that is used as a work area when the CPU 711 executes programs, and an operation unit 800. The detection result of the operation unit interface 714 that acquires the input data and sends the display data to the operation unit 800 and the sensor group 820 in the image reading device 301 is acquired, and the image reading device 301 includes the detection result based on the detection result. And an I / O control unit 715 that transmits a control instruction to various loads 810 such as a motor.

The gate generation unit 720 generates an averaged gate signal for determining a portion to be averaged in the output data D _out [9: 0] output from the reading unit 103. Specifically, for example, the 1000th pixel is set as the default value of the position, 64 dots as the default value of the width, and 16 lines as the default value of the number of lines are set via the I / O control unit 715 of the control unit 710. An averaging gate is generated based on LSYNC, which is a synchronization signal in the main scanning direction, and a clock CLK synchronized with image data. FIG. 7 is a time chart showing the relationship between the image data, the main scanning synchronization signal LSYNC, and the averaging gate.

The gate controller 730 masks the image data D _out [9: 0] with the averaged gate signal generated by the gate generator 720, and the image data D _out [9: 0] is output.

The CPU 711 obtains an average value of the fetched output data D _out [9: 0] by the gate control unit 730 and corrects the correction coefficients Rref and Gref for each color so that the average value becomes a predetermined value. , Bref are determined by equations (5) to (7), and set in the gray balance circuit 204 inside the reading unit 103 via the I / O control unit 715.

  Note that the gate generation unit 720 generates the averaged gate signal based on the above-described default values of the position, width, and number of lines, but the operation unit determines whether or not the value specified by the user is used by the user. When there is an input to display on the screen of 800 and use the value specified from the screen, the specified value input from the operation unit 800 is further input by the user via the operation unit 800. An average gate signal is generated based on

  Next, correction coefficient adjustment processing executed by the control unit 710 of the image reading apparatus 301 according to the third embodiment configured as described above will be described. FIG. 8 illustrates correction coefficient adjustment processing according to the third embodiment. It is a flowchart which shows the procedure of.

  First, the control unit 710 determines whether or not a correction coefficient calculation instruction has been input from the operation unit 800 by the user (step S11). When a correction coefficient calculation instruction is input (step S11: Yes), the control unit 710 uses the operation unit 800 to input designated values for the position, width, and number of lines for averaging processing. It is determined whether or not there is an input for use (step S12).

  When there is an input indicating that the specified value is to be used (step S12: Yes), the control unit 710 receives input of the specified value of position, width, and number of lines from the operation unit 800 (step S13). On the other hand, when there is no input indicating that the specified value is to be used (step S12: No), the position, width, and number of lines that are set as default values in advance are acquired from the ROM 712 or the like (step S14).

Then, the gate generation unit 720 generates an averaged gate signal using the designated value or default value of the position, width, and number of lines (step S15). Then, the gate control unit 730 masks the output data D _out [9: 0] with the generated averaged gate signal and outputs it to the control unit 710, and the CPU 711 of the control unit 710 receives the input output data D The average value of _out [9: 0] is calculated and acquired (step S16).

Further, the CPU 711 calculates the correction coefficient for each color using the average value of the acquired output data D _out [9: 0] according to the equations (5) to (7) (step S17). Then, the calculated correction coefficient is set in the gray balance circuit 204 inside the reading unit 103, and the CPU 711 of the control unit 710 calculates the average value of the output data D _out [9: 0] by the same procedure as Steps S15 and S16. It is acquired again (step S18).

Then, it is checked whether the average value of the output data D _out [9: 0] is within a predetermined range that should be the target value (step S19). If the average value is within the predetermined range (step S19: Yes), the process is terminated. On the other hand, when the average value is not within the predetermined range (step S19: No), the processes of steps S17 and S18 are repeatedly executed, and the correction coefficient is calculated from the output data D _out [9: 0] acquired again. Then, the process is continued until the average value falls within a predetermined range that is the target value.

  As described above, in this embodiment, adjustment of the correction coefficient when the reading unit 103 is incorporated in the image reading apparatus 301 and the average value of the reference original (adjustment original) are performed by the image reading apparatus 301 itself. Even when the unit 103 and the image reading apparatus 301 are manufactured at different locations, the output data value from the preceding gray balance circuit 204 input to the color correction circuit 205 is the same while reducing the amount of work for the operator. Can be. As a result, even when the reading unit incorporated in the image reading apparatus is manufactured in another place, it is not necessary to regenerate the color correction parameter, and stable color correction can be performed regardless of manufacturing conditions.

  Next, details of the optical unit 201 in the image reading apparatuses of Embodiments 1 to 3 will be described.

  FIG. 9 is a schematic diagram illustrating an outline of a mechanical configuration of the optical unit 201 in the reading unit 103. In FIG. 9, the optical unit 201 includes a first mirror 401, a second mirror 402, a third mirror 403, an imaging lens 404, a CCD 405 as a photoelectric conversion element, and a light source 406. The first mirror 401 and the light source 406 are mounted on the first traveling body 901, the second mirror 402 and the third mirror 403 are mounted on the second traveling body 903, and the first traveling body 901 and the second traveling body 903 are It moves in the sub-scanning direction (SS direction in FIG. 9) at a speed ratio of 2: 1, and in this moving process, the document 101 on the contact glass 902 is read.

  That is, when the original 101 is illuminated by the illumination optical system having the light source 406, the illumination light reflected by the original 101 is reflected and deflected by the first mirror 401 and then by the second mirror 402 and the third mirror 403. The light is sequentially reflected and deflected, guided to the imaging lens 404, and reduced and coupled onto the incident surface of the CCD 405 by the imaging lens 404. The CCD 405 reads the optical data on the incident surface, and outputs the photoelectrically converted analog signal to the signal processing unit 202 at the subsequent stage.

  FIG. 10 is a diagram showing an outline of another mechanical configuration of the optical unit 201 in the reading unit 103. In FIG. 7, the optical unit 201 includes a contact image sensor, so-called CIS (Contact Image Sensor) 500. The CIS 500 includes an SLA (Selfoc Lens Array) (registered trademark) 501, a sensor IC 502, and light sources 503a and 503b. In the optical unit 201 configured as described above, the original 101 is illuminated by the illumination optical system having the light sources 503a and 503b. The illumination light reflected by the document 101 is guided by the SLA 501 and is reduced and coupled onto the incident surface of the sensor IC 502 by the SLA 501.

  In the example of FIGS. 9 and 10, the document 101 and the optical unit 201 need only move relatively in the sub-scanning direction. Even if the optical unit 201 moves in the sub-scanning direction, the document 101 side remains in the sub-scanning direction. You may move.

  It should be noted that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiments. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

It is explanatory drawing which shows the notional structure of an image reading apparatus. 3 is a block diagram illustrating a configuration of a reading unit according to Embodiment 1. FIG. It is a block diagram which shows the structure of the signal processing part in a reading part. It is a block diagram which shows an example of a structure of the image reading apparatus in which a reading part is integrated. 6 is a block diagram illustrating a configuration of a reading unit according to Embodiment 2. FIG. FIG. 6 is a block diagram illustrating a configuration of an image reading device according to a third embodiment. 4 is a time chart showing the relationship between image data, a main scanning synchronization signal LSYNC, and an averaging gate. 10 is a flowchart illustrating a procedure of correction coefficient adjustment processing according to the third embodiment. It is a figure which shows the outline of the mechanical structure of the optical part in a reading part. It is a figure which shows the outline of the other mechanical structure of the optical part in a reading part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Document 102 Reference white plate 103 Reading unit 201 Optical unit 202 Signal processing unit 203 Shading correction circuit 204 Gray balance adjustment circuit 205 Color correction circuit 301, 801 Image reading device 302 Image processing unit 303 Output unit 304 Printer 401, 402, 403 Mirror 404 Hole image lens 405 CCD
406 Light source 500 CIS
501 SLA
502 Sensor IC
503a, 503b Light source

Claims (11)

An image reading device,
A reading unit that reads a document and outputs image data;
An image processing unit that performs image processing of image data output from the reading unit,
The reading unit
An optical unit that irradiates the original with irradiation light, and reflects the irradiation light reflected from the original; and
A converter for generating digital data of an image signal read from the incident reflected light;
An adjustment unit for adjusting the output level of the digital data based on a correction coefficient for each color;
A color correction unit that executes color correction processing for correcting variations in the output level after adjustment based on color correction parameters having different values for each image reading device;
The correction coefficient is generated so that the output level when the original is read in a state in which the color correction process is not performed before the reading unit is incorporated into the image reading apparatus is set to a predetermined value. An image reading apparatus that has been adjusted in a state in which the color correction processing is not executed when the reading unit is incorporated into the image reading apparatus. The image reading apparatus according to claim 1, further comprising a control unit that adjusts the correction coefficient without executing the color correction process when the reading unit is incorporated into the image reading apparatus. An input unit that accepts designation of a position range of the document in the main scanning direction;
The said control part further calculates | requires the average value of the said output level with respect to the said position range received by the said input part among the said digital data, and adjusts the said correction coefficient based on the said average value. 2. The image reading apparatus according to 2.   The correction coefficient is read at the same position in the main scanning direction of the document when it is generated before the reading unit is incorporated into the image reading device and when it is generated when the reading unit is incorporated into the image reading device. The image reading device according to claim 1, wherein the image reading device is generated based on the output level according to claim 1.   The correction coefficient is used when the correction coefficient is generated before the reading unit is incorporated into the image reading apparatus in a state where the color correction process is not performed when the reading unit is incorporated into the image reading apparatus. The image reading apparatus according to claim 1, wherein the output level when the same original as the read original is read is adjusted to a predetermined value.   The image reading apparatus according to claim 1, wherein the optical unit includes a reduction optical module.   The image reading apparatus according to claim 1, wherein the optical unit includes a contact image sensor. An image forming apparatus,
A reading unit that reads a document and outputs image data;
An image processing unit that performs image processing of image data output from the reading unit,
The reading unit
An optical unit that irradiates the original with irradiation light, and reflects the irradiation light reflected from the original; and
A converter for generating digital data of an image signal read from the incident reflected light;
An adjustment unit for adjusting the output level of the digital data based on a correction coefficient for each color;
A color correction unit that executes color correction processing for correcting variations in the output level after adjustment based on color correction parameters having different values for each of the image forming apparatuses,
The correction coefficient is generated so that the output level when the original is read in a state where the color correction processing is not performed is set to a predetermined value before the reading unit is incorporated in the image forming apparatus. An image forming apparatus, which is adjusted without executing the color correction processing when the reading unit is incorporated in the image forming apparatus. Irradiation light is irradiated onto the original, reflected light from the original is incident on the original, digital data of an image signal read from the incident reflected light is generated, and the output level of the digital data is set for each color. An embedded method that incorporates a reading unit that performs adjustment based on a correction coefficient and executes color correction processing for correcting variations in the output level after adjustment based on color correction parameters having different values for each image reading device. ,
A first generation step of generating the correction coefficient so that the output level when the original is read without executing the color correction processing is set to a predetermined value before the reading unit is incorporated in the image reading apparatus. When,
A second generation step of generating the color correction parameter for each of the image reading devices;
A step of incorporating the reading unit into the image reading device;
An adjustment step of adjusting the correction coefficient in a state in which the color correction processing is not performed when the reading unit is incorporated into the image reading device;
An embedded method characterized by including:   The adjusting step adjusts the correction coefficient based on the output level obtained by reading the same portion in the main scanning direction from which the original is read when the correction coefficient is generated in the first generation step. The method according to claim 9, wherein the method is incorporated.   The adjustment step adjusts the correction coefficient so that the output level when the same document as that used in the first generation step is read is a predetermined value. The described integration method.

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