JPH08102866A - Image reader - Google Patents

Abstract

PURPOSE: To obtain an image data faithful to a source document transferring an light-received electric charge through the use of a transferring part corresponding to a scanning direction and controlling correction in a correcting means in accordance with the scanning direction. CONSTITUTION: A scanner 4 is constituted of a lamp 3, a CCD 5, etc., and capable of reading an image in both cases of back and forth scanning. Then, a shift register transferring the electric charge based on the shift direction (main scanning direction) of the scanner 4 is selected. A color diviation which is generated by a characteristic based on the combination of a photodiode with a CCD analog regist corresponding to respective kinds of RGB color in the respective scanning directions of the forth direction and back direction is corrected by changing-over a correction coefficient based on the scanning direction in a color signal correcting part. Therefore, image data faithful to the original is obtained by the image reader where the source document is scanned in the different direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image processing apparatus and method for correcting the characteristics of reading means for reading an original.

[0002]

2. Description of the Related Art Generally, in an image forming apparatus, a document is read by an image input section, converted into an electric signal, image processing is performed on this signal by an image processing section, and then recorded as an image by an output section such as a laser printer. It is known to be done. However, the electric signal from the image input unit such as CCD is C
It depends on the characteristics of the CD, and various image processes are performed after correcting this to a standard color space. Since such characteristics of the image signal from the CCD are always in the same state, such a correction can be performed by calculation using a preset coefficient.

[0003]

However, in the conventional method, when the characteristics of the image signal from the CCD are not always in the same state, there is a problem that the correction cannot be performed corresponding to each state.

The present invention has been made in view of the above points, and uses a light receiving means for receiving the reflected light from the document and a transfer section for transferring the charges received by the light receiving means by using a transfer section according to the scanning direction. It is an object of the present invention to obtain image data faithful to an original with an image reading device having means for scanning the original in different directions.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing the arrangement of an image processing apparatus according to this embodiment.

In FIG. 1, reference numeral 1 denotes an image feeding device which serves as a document feeding means, and one or two placed documents are placed one by one.
The sheets are continuously fed to a predetermined position on the platen glass surface 2. Four
Is a scanner composed of a lamp 3, a CCD 5 and the like, and when placed on the platen glass surface 2 by the document feeding device 1,
The main body is reciprocally scanned and the reflected light of the original is read by the CCD 5. Since this scanner can read an image in both forward and backward scanning, high speed reading is possible.

Reference numeral 10 denotes an exposure control section composed of a laser scanner, which is an image signal control section 1 of the controller section CONT.
The photoconductor 11 is irradiated with the light beam modulated based on the image data output from 023 (see FIG. 2). 12,
A developing device 13 visualizes the electrostatic latent image formed on the photoconductor 11 with a developer (toner) of a predetermined color. Reference numerals 14 and 15 denote transfer paper stacking units, which store and store fixed-size recording media, and are fed to the registration position by the driving of the feeding roller, and the image leading edge alignment timing with the image formed on the photoconductor 11. The paper is re-fed in the state where it has been taken.

Reference numeral 16 denotes a transfer separation charger, which transfers the toner image developed on the photoconductor 11 to a transfer paper and then the photoconductor 11
It is further separated and fixed by the fixing unit 17 via the conveyor belt. A paper discharge roller 18 stacks and discharges the transfer-receiving paper on which the image formation is completed on the tray 20. Reference numeral 19 is a direction flapper for switching the carrying direction of the transferred paper on which the image formation has been completed to the paper discharge port and the internal carrying path direction to prepare for the multiplex / double-sided image forming process.

Image formation on a recording medium will be described below. The image signal input to the CCD 5, that is, the input signal from the image reader control unit 1022 described later is C
Image signal control unit 1 controlled by the PU circuit unit 1025
Printer control unit 1024
Leading to. The signal input to the printer control unit 1024 is converted into an optical signal by the exposure control unit 10 and irradiates the photoconductor 11 according to the image signal. The latent image formed on the photoconductor 11 by the irradiation light is developed by the developing device 12 or the developing device 13. The transfer paper is conveyed from the transfer paper stacking unit 14 or the transfer paper stacking unit 15 in synchronization with the latent image timing, and the developed image is transferred to the transfer unit 16. The transferred image is fixed on the transfer paper by the fixing unit 17, and then discharged from the paper output unit 18 to the outside of the apparatus.

During double-sided recording, after the transfer target paper passes the paper discharge sensor 19, the paper discharge section roller 18 is rotated in the direction opposite to the paper discharge direction. At the same time, the flapper 21
Is moved up and the copied transfer paper is stored in the intermediate tray 24 via the transport paths 22 and 23. The transfer paper stored in the intermediate tray 24 is fed at the time of the next back surface recording,
The back side is transferred.

Further, at the time of multiple recording, the flapper 21 is raised and the copied transfer paper is stored in the intermediate tray 24 via the conveyance paths 22 and 23. The transfer paper stored in the intermediate tray 24 is fed to the next multiplex recording, and the multiplex transfer is performed.

The structure of the scanner unit will be specifically described below with reference to FIG.

The scanner 1800 is a scanner body 1800.
a and a document feeder 1800b.

Reference numeral 1810 is a platen glass on which an original is placed, 1805 is a halogen lamp for exposing the original, and 1802 is a first reflection mirror.
812 is configured.

Reference numeral 1803 denotes a second reflecting mirror and 1804 denotes a third reflecting mirror, which constitutes a mirror unit 1813.

Reference numeral 1801 denotes a lens unit for reducing and forming a reflected light image from a document exposed and scanned by the halogen lamp 1805 on the color CCD linear sensor 1700. Reference numeral 1809 denotes a document flow reading using the document feeder 1800b. This is a platen glass for non-stop reading when performing.

Further, an original is mounted on the platen glass 1810, and the mirror units 1812 and 1813 are moved by the stepping motor 1814 at a scanning speed of 2: 1 by arrow A.
When the original is read by moving and scanning in the direction (sub-scanning direction), the mirror units 1812 and 1813 start from the positions indicated by broken lines.

The document scanner 1800b is composed of the following.

Reference numeral 1806 denotes an original input tray, and 18
Reference numeral 07 is a document pickup roller, 1808 is a feed roller for feeding the document, and 1811 is a paper discharge roller.

In this case, the original is placed on the input tray 1806 with its front side facing upward, and in the case of single-sided reading, the original is sent to the feed roller by the pickup roller 1807 and fed by the feed roller according to the reading timing of the original. Mirror unit 1 when it is transported in the direction of the broken line arrow and passes over the flow reading platen glass.
The reflected light image is reduced and formed on the color CCD linear sensor 1700 through the lens units 1801 and 812 and 1813.

Next, in the case of reading a double-sided original, the original fed by the feed roller is conveyed in the direction of the solid line arrow, first the front surface passes through the reading position of the platen glass for flow reading and is read, and then the original is conveyed. The sheet is reversed according to the path, the back side is read from the direction opposite to the reading direction at the time of front side reading, and the sheet is discharged to the sheet discharge tray 1811 as in the case of single-sided original reading.

At this time, the scanning direction of the image formed on the color CCD linear sensor 1700 is the direction of arrow a when reading the front side and the direction of arrow b when reading the back side.

FIG. 2 shows the configuration of the controller unit CONT.
FIG. 10 is a block diagram illustrating an example, and 1025 is a CPU circuit unit that includes a ROM 1026 and a RAM 1027, and
Control program and operation unit 10 stored in M1026
Based on the mode set in 28, the processing timing and the processing content in each unit are comprehensively controlled.

Reference numeral 1021 denotes an automatic document feeder control unit which controls the feeding of the placed originals one by one or continuously to a predetermined position on the surface of the original glass 2.

An image reader control unit 1022 is composed of the CCD 5 and the like, and outputs a photoelectrically converted analog image signal to the image control unit 1023. In addition, the image reader control unit 1022 to the image signal control unit 1023
A signal indicating the moving direction of the scanner is input to. 10
A printer control unit 24 drives the exposure control unit 10 based on the video signal output from the image signal control unit 1023 to irradiate the photoconductor 11 with a light beam. Also, 1028
Is provided with an operation panel having keys, a display and the like for setting a mode of image formation and image reading on the operation unit.

The modes to be set include, for example, a double-sided reading mode and a single-sided reading mode. FIG. 3 is a diagram showing a schematic configuration of a sensor used in the image reader control unit 1022.

In the figure, a and b indicate the moving directions of the scanner. In the present embodiment, the a direction is the forward scanning direction (when reading the front side), and the b direction is the backward scanning direction (when reading the back side).
Reference numerals 1301, 1302, and 1303 denote red, blue, and green photodiodes, respectively. 1304, 1305, 130
6, 1307 are CCD analog shift registers,
The charge from the photodiode is sequentially transferred, and has characteristics when transferring different charges of 1304, 1305, 1306, and 1307. 1308, 130
This is amplified and output by the preamplifiers 9, 13, 10 and 1311. A switch 1312 selects the outputs of 1308 and 1311 based on the information indicating the scanning direction input from the CPU circuit unit 1025.

First, the operation when moving in the direction a will be described. The charges obtained in 1301, 1302, 1303 are transferred using 1305, 1306, 1307, respectively. After that, 1309, 1310, 131 respectively
Amplify using 1 and output. At this time, switch 1312
Is connected to the output from 1311.

Next, the operation when moving in the direction b will be described. Similarly, in the scanning in the a direction, charges corresponding to the original image are obtained by the red, blue, and green photodiodes 1301, 1302, and 1303. 1301, 1302, 1303
The electric charges obtained by the photodiodes are different from those of the CCD shift registers 1304 and 1304 which are different from those in the scanning in the a direction.
Transfer using 305 and 1306. After that, they are amplified and output using 1308, 1309, and 1301, respectively. At this time, switch 1312 is connected to the output from 1308.

As described above, since the shift register for transferring the charges is selected based on the moving direction of the scanner (main scanning direction), the charges can be transferred efficiently. Therefore, the double-sided image can be read at high speed and satisfactorily.

FIG. 7 shows a Time Delay Integ adopted in the present embodiment based on the above-mentioned outline.
The configuration of the position (TDI) type sensor will be specifically described.

This TDI has a plurality of lines of photoelectric conversion means of a linear image sensor, and the output signals of the photoelectric conversion means of a plurality of lines are sequentially combined in synchronism with the reading operation of a scanner equipped with the line sensor, thereby producing a line sensor. It is possible to obtain an output signal of the number of lines of the photoelectric conversion means included in.

Therefore, it is possible to perform high-speed image reading which cannot be realized by the conventional three-line sensor due to the problem of the light amount accumulation time.

Reference numeral 100 is a TDI type color CCD linear image sensor, and 101, 102 and 103 are each R.
These are CCD linear sensor units of ed, Blue, and Green.

Reference numerals 102a to 102c denote linear photodiode arrays each having a Red on-chip filter, and 103a to 103c and 104a to 104c each have a linear photodiode array.
Similar to 2a to 102c, it is a linear photodiode array having on-chip color filters of Blue and Green, respectively.

105a-105b, 108a-108b
Represents the charges generated in the linear photodiode arrays 102a to 102c in the respective output sections 109a to 109b, 1
CCD shift registers for horizontal transfer to 30a to 130b, 105a to 105b for a direction (front side) reading (solid line arrow direction in FIG. 1), 130a to 130b for b direction (back side) reading (dotted line arrow in FIG. 1). Direction).

Further, 105a and 105b are 103a to 10b.
It is also a CCD shift register for horizontally transferring the electric charges generated in 3c to the output units 109a and 109b (for reverse reading of Blue).

CCDs 106a and 106b are for transferring the charges generated in the blue linear photodiode arrays 103a to 103c to the output units 110a to 110b.
A shift register for reading Blue in the a direction.

At the same time, it is also a CCD shift register for outputting charges generated in the green linear photodiode arrays 108a to 108c (for reading in the green reverse direction).

Reference numerals 107a-107b are CCD shift registers for horizontally transferring charges generated in the green linear photodiode arrays 104a-104c to the output sections 111a-111b.

Shift gates SH1, SH2 for transferring the charges generated in the linear photodiode array 102a to the next-stage linear photodiode array 102b and combining with the charges generated in the linear photodiode array 102b. , SH3 and a
The shift gates SH1 (112) and SH2 are read during direction reading.
(113), the shift gate SH3 (114) is sequentially operated to transfer the charges in the direction of the solid line arrow, but the operation order of the shift gates SH1 to SH3 (112 to 114) is the same as that in the a direction when reading in the b direction. The opposite is true.

That is, the shift gate SH3 (114) →
SH2 (113) → SH1 (112). 115-
Reference numeral 117 denotes the linear photodiode array 1 as in the above.
Shift gates SH4 through SH4 to transfer charges in the vertical direction in order to combine the charges generated between 02b and 102c.
It is SH6, and the operation sequence at the time of a-direction reading and b-direction reading is SH4 → SH5 → SH6, SH6 → SH5 →, respectively.
It is SH4.

Reference numeral 118 is a linear photodiode array 1
The charge generated at 02c is applied to the horizontal CCD shift register 10
5a and 105b are shift gates SH7 for transferring in synchronization with the reading speed of the scanner, and reference numerals 119 and 120 are horizontal CCDs for charges of the linear photodiode array 102c transferred by the shift gates SH7 (118).
Switch gates SG1 and SG2 for sequentially transferring each pixel to the shift registers 105a and 105b. Due to the switch gate SG1, the electric charge of the odd-numbered pixel is horizontal C
The charge of the even pixel is transferred to the CD shift register 105b, and the charge of the even pixel is transferred to the horizontal CC by the switch gate SG2 (120).
It is transferred to the D shift register 105a.

Reference numerals 121 to 123 denote transfer gates TG1 to TG3 for transferring charges between registers between the horizontal CCD shift registers 105a and 105b, which is the same as the transfer of charges between the linear photodiodes described above.
The operation sequence is TG1 →
It is possible to switch the transfer direction between forward and reverse by changing TG2 → TG3 and TG3 → TG2 → TG1 (a direction: solid arrow, b direction: dotted arrow).

Here, the horizontal CCD shift register 105
a and 105b are two-phase drive, and as is generally known, two registers of φ1 and φ2 are alternately connected. By alternately inputting a pulse to these two registers, the potential of the CCD register is increased. Change,
Although the charge is sequentially transferred in the direction of the output section (here, the direction of 109a and 109b), in the transfer between the registers of the transfer gates TG1 to TG3 described above, the register of φ1 in the two registers is transferred. It shall be done using.

Next, 124 is a shift gate SH8,
Charge the linear photodiode array 102a with a CCD
The data is transferred to the shift registers 108a and 108b in synchronization with the reading speed of the scanner. Reference numerals 125 and 126 denote switch gates SG1 and SG2, which charge the shift gate SH8 with C
This is for sequentially transferring pixel by pixel to the CD shift registers 108a and 108b, and the charge of odd pixels is transferred to the CCD shift register 108a by the switch gate SG1.
By the switch gate SG2, the charge of an even pixel is CCD
It is transferred to the shift register 108b.

127 to 129 are transfer gates TG
1 to TG3, and CCD shift registers 108a and 1
It is for register transfer between 08b. The operation is similar to that described above.

FIG. 8 shows a timing chart of the color CCD linear image sensor 100 of FIG.

In (a) reading in the a direction, SH7, SG1 and SG2 become "H" at the timing of T ₁ , and the charges of the linear photodiode array 102c are transferred to the shift gates SG1 (119 and SG2 (120), respectively. In the state of T ₂ , SG1 is “H” → “L”, φ1 is “L”
→ becomes “H”, and the charge of the shift gate SG1 (119) is transferred to the φ1 register of the CCD shift register 105a.

Next, at T ₃ , φ1: “H” → “L”,
TG1: becomes "H", and charges are transferred from the register of φ1 to the transfer gate TG1 (121).

Similarly, at T ₄ , TG1: “H” →
“L”, TG2: “L” → “H”, TG at T ₅
2: "H" → "K", TG3: "L" → "H",
Charge is transferred from TG1 (121) to TG
2 (122) and TG3 (123) are sequentially transferred.

At T ₆ , the switch gate SG2 (1
20) changes from "H" to "K" and φ1 changes from "L" to "H" again, the charge of the switch gate SG2 (120) is transferred to the register of φ1 of the CCD shift register 105a, and the transfer gate is transferred. TG3
Since (123) changes from “H” to “L”, the charge of the transfer gate TG3 (123) is changed to the CCD register 10.
5b is transferred to the φ1 register.

The shift gate SH for the TDI operation
In the transfer in 1 to SH7, as shown in the figure, charges are transferred to the CCD shift registers 105a and 105b for the first time in the 7th cycle from SH1 to SH7 one shift gate at a time in one cycle, and read as an output.

In the case of (b) transfer in the b direction, instead of the shift gate SH7 (118), the shift gate SH8 (1
24) operates and shift gates SH1 to SH6 (112
~ 117), transfer gates TG1 to TG3 (1
The operation timings of (21-123) are the same as in the case of forward transfer in FIG.

Color CCD linear image sensor 1
Although the CCD linear image sensor unit 101 of Red No. 00 has been described, the operations of the same symbols in the CCD linear image sensor units 102 and 103 of Blue and Green are the same, and therefore the description thereof is omitted here.

FIG. 4 is a detailed diagram showing an example of the image signal controller 1023.

In FIG. 4, the image reader control unit 102
The analog signal converted into the RGB electrical signal by 2 is converted into the digital signal by the A / D converter 30 (each 8 bits in this embodiment).

The black correction / white correction unit 31 includes photodiodes 1301, 1302, and 1303 corresponding to RGB colors.
The black level and the white level are corrected (shading correction) in order to correct the characteristic in (1). Color signal correction unit 32
Is a CCD analog shift register 1304, 1305, 1306, 130 for each input RGB signal.
The characteristic in 7 is corrected so that the input RGB signal represents a color faithful to the original.

Therefore, the image correction control unit 1022 by the black correction / white correction unit 31 and the color signal correction unit 32.
Are converted into RGB color signals whose characteristics have been corrected.

In the ND signal generator 33, the color signal corrector 3
RGB signals corrected by 2 are added and 1/3
And the luminance signal Dout is output.

Dout = (Rin + Gin + Bin) / 3

The luminance signal Dout is sequentially stored in the page memory section 34.

The luminance signal stored in the page memory unit 34 is read by the scanner in a reciprocating manner, and the charge obtained by each photodiode is transferred using the CCD shift resist based on the transfer direction. On the other hand, since the scanning direction of image data read by scanning in the backward direction is reversed, the order of data obtained by the scanner is reversed and accumulated. Therefore, with respect to the image data obtained by scanning in the backward direction, which is inverted and accumulated, the reading direction from the page memory unit 34, that is, the data reading order is reversed.

Therefore, the image data having the same property, that is, the order, can be obtained in the output of the page memory regardless of whether the scanning is performed in the forward direction or the backward direction.

The image processing unit 35 inputs the upper 4 bits of the image data stored in the page memory unit 34.

The image processing unit 35 performs variable magnification for enlarging / reducing an image, negative / positive designation, trimming / masking, various filter processes, and the like.

Thereafter, the density correction unit 36 performs luminance-density conversion and density correction in the printer, and the result is sent to the printer control unit 1024 of the laser printer.

The detailed operation of the color signal correction section 32 will be described below. The color signal correction unit 32 uses the RGB image signal and the signal indicating the scanning direction to determine the image reader control unit 102.
The RGB image signal in which the characteristics of 2 are corrected is output. Here, the correction means that the image data does not depend on the characteristics of the image reader control unit 1022, and specifically, the RGB signal that depends on the filter color of the photodiode is a standard RGB signal, and CC By outputting RGB signals that do not depend on the characteristics of the analog shift register, the output color is the same in either scan. Specifically, in the color signal correction unit 32, the distortion regarding the tint caused by the characteristic based on the combination of the photodiode and the CCD analog shift register corresponding to each RGB color in each of the forward and backward scanning directions is shown below. The correction is performed by switching to the scanning direction. First, when scanning in the a direction, output image signals Ro, B are calculated by the following matrix calculation for input image signals of Ri, Bi, Gi.
Get o and Go. a11, a12, ..., A33 are color signal correction coefficients.

[0070]

[Outside 1]

Next, when scanning in the b direction, the output image signals Ro, Bo, are calculated by the following matrix calculation for the input image signals of Bi, Gi, Ri.
Get Go. a11 ', a12', ..., A33 'are color signal correction coefficients.

[0072]

[Outside 2]

FIG. 5 shows the details of the color signal correction unit 35 which executes the above-mentioned two calculations. a (b) is the scanning direction a
Alternatively, signals input from the CPU circuit unit 1025 indicating b, Ri, Bi, and Gi are input image signals when being scanned in the a direction, and an input image signal surrounded by () is being scanned in the b direction. Is an input signal when. R
o, Bo, and Go are corrected output image signals. 60
1 to 609 and 611 to 619 are color signal correction coefficients a1.
It is a register in which 1 to a33 and a11 'to a33' are set. Reference numeral 600 denotes a selector that switches these coefficients according to a signal indicating the scan direction. For example, when scanning in the a direction, a11 to a3
3 is output from the selector. When scanning in the b direction, a11 'to a33' are output from each selector. A multiplier 610 multiplies each input image signal by the color signal correction coefficient output from the selector. 62
Reference numeral 0 denotes an adder, which can correct the input image signal by outputting the sum of the inputs from the multipliers.

In the present embodiment, the feeding timing of the feeder section and the switch 131 of the image reader control section
C so that the switching timing of No. 2 and the coefficient switching timing of the color signal correction unit 32 of the image signal control unit 10223 are synchronized.
A control signal is output from the PU circuit unit 1025 to each unit.

Therefore, the coefficients can be switched according to the characteristics of the image signal from the CCD.

Therefore, the coefficients can be switched according to the characteristics of the image signal from the CCD, so that resetting is not necessary and the real-time property is not impaired.

Further, since only one correction unit is required, the correction can be performed without increasing the cost.

In the present embodiment, switching of two types of coefficients has been described, but it is possible to easily switch any number of types of coefficients by applying this embodiment.

Further, in the present embodiment, the matrix calculation is used for the correction, but the present invention is not limited to this, and the correction may be carried out by changing the LUT or the like according to the scanning direction.

The correction method as described above can also be applied to the case where a plurality of types of color spaces to be corrected are switched.

Further, it may be applied to other corrections such as shading.

As described above, according to this embodiment, since the correction is performed according to the state of the reading means, it is possible to obtain image data faithful to the original.

Further, since the transfer means suitable for the transfer direction of the reading means is selected, the transfer can be performed efficiently.

Further, since the correction is carried out by using the coefficient based on the original scanning direction, it is possible to obtain the image data faithful to the original independent of the original scanning direction.

[0085]

According to the present invention, an original having a light receiving means for receiving the reflected light from the original and a transfer means for transferring the electric charge received by the light receiving means by using a transfer portion according to the scanning direction is different. Image data that is faithful to the original can be obtained with an image reading device that scans in the direction.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of a structure of an image processing apparatus of the present invention.

FIG. 2 is a block diagram of the COUNT of the controller unit of FIG.
It is a block diagram explaining an example.

FIG. 3 is a block diagram showing an outline of the TDI of FIG.

FIG. 4 is a block diagram showing an example of an image signal control unit in FIG.

FIG. 5 is a block diagram showing an example of a color signal correction unit according to the present invention.

FIG. 6 is a diagram showing an example of a configuration of a scanner unit.

FIG. 7 is a diagram showing an example of a configuration of a TDI sensor.

FIG. 8 is a timing chart in the reading operation of the TDI sensor in the present embodiment.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Yasuhiro Takiyama 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Tadashi Takahashi 3-30-2 Shimomaruko, Ota-ku, Tokyo Canonon Within the corporation

Claims (10)

[Claims] 1. An image reading apparatus for scanning a document in different directions, comprising: a light receiving unit for receiving reflected light from the document; and a charge received by the light receiving unit using a transfer unit according to the scanning direction. An image including: a transfer unit that transfers the image data; a correction unit that corrects the image signal output from the transfer unit; and a control unit that controls the correction in the correction unit according to the scanning direction. Reader. 2. The image reading apparatus according to claim 1, wherein the scanning directions are a forward direction and a backward direction. 3. Further, information indicating whether the scanning direction is a forward path or a backward path is generated based on the scanning,
The image reading apparatus according to claim 2, further comprising an output unit that outputs the image to the control unit. 4. The image reading apparatus according to claim 1, wherein the correction unit changes the correction coefficient under the control of the control unit. 5. The image reading apparatus according to claim 1, wherein the correction unit performs correction based on a combination of the light receiving unit and the transfer unit. 6. The image reading apparatus according to claim 1, wherein the light receiving unit has a plurality of light receiving units corresponding to a plurality of color components, and the transfer unit has a plurality of transfer units. 7. A double-sided reading mode and a single-sided reading mode are provided. In the double-sided reading mode, the front and back surfaces of the original are scanned in forward and backward directions, and in the single-sided reading mode, The image reading apparatus according to claim 1, wherein the surface of the original is scanned in the forward direction. 8. The light-receiving unit has a plurality of light-receiving units that receive light of substantially the same wavelength, and combines the charges received by each of the light-receiving units using intra-pixel transfer. 1. The image reading device described in 1. 9. The image reading apparatus according to claim 1, wherein the correction unit performs matrix calculation. 10. A light receiving means for receiving a reflected light obtained by scanning an original, a transfer means for transferring an electric charge received by the light receiving means by using a transfer section according to a scanning direction, and a color correction. Image reading, characterized in that it has a control means for controlling the transfer means by inputting second information indicating the scanning direction in synchronization with the first information indicating the scanning direction input to the means. apparatus.