JP2000332960A - Device and method for reading image and computer readable storage medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce color slurring due to LED switching in an image reader which switches the respective LEDs of RGB and reads a color image while moving an original in a vertical scanning direction to a reading means. SOLUTION: The respective colored light of RGB successively irradiate by 1/6 each two times during reading one line while moving an original 6 in the vertical scanning direction of the arrow. That is, the LED of R radiates in the diagram (a), next, the LED of G radiates in (b) and the LED of B radiates in (c). Further, the LEDs of R, G and B successively radiate in the same line at the second time in (d), (e) and (f). The reading of the next line after (g) is also performed in the same manner. The data for one line are determined by taking the sum or average value of data obtained by reading each line two times. Thus, the deviation of a read position of LEDs of the three colors of RGB that are successively turned on can be reduced in comparison with the conventional practice.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading apparatus and method suitable for use in a scanner or the like for obtaining a color image while irradiating an original with a plurality of color lights, and a computer-readable storage medium used in the apparatus and method. is there.

[0002]

2. Description of the Related Art Today, with the development of information processing systems,
Various information processing devices have been developed. Among these devices, information processing devices such as an image reading device and a facsimile device having an image reading function are widely used not only in offices but also in ordinary households. A reading unit used in these information processing apparatuses includes a reduction optical system that reduces an original image and guides the reduced image to a photoelectric conversion element such as a CCD.
The optical system is roughly divided into two types: an equal-magnification optical system in which D is brought close to the original and the original image is guided to the CCD at the same magnification.

FIG. 9 shows an example of a conventional image reading apparatus using the same magnification optical system. The image reading apparatus mainly includes an electric board (control board 201, main power supply 202), a reading unit 203, an operation unit 204, and the like.

A reading unit 203 includes a document tray 205 for setting and stacking the documents 211, an upper document guide 206 for guiding the documents 211 to a predetermined conveyance path, and a lower document guide 2.
07, a document separating unit 208 for sequentially feeding a plurality of documents,
A contact sensor 209 using a photoelectric conversion element, and a reading reference plate 210 serving as a background color (background color) of a document attached to the upper surface of the contact sensor 209 facing the same.
have.

[0005] As for the conveying path of the original 211, first, the original sandwiched between the original separating roller 212 and the preliminary conveying leaf spring 213 is conveyed one by one by a friction piece 214. Then, the original 211 is fed by the feeding roller 215 and the opposing roller 216.
Then, the paper passes between the contact sensor 209 and the reading reference plate 210, and is discharged in the direction of the arrow in FIG.

The surface of the reading reference plate 210 which comes into contact with the reading surface is made white in accordance with the background color of the document (background color), or black instead of the background color of the document. There are cases. In this conventional example, it is configured in white. The contact sensor 209 is held by the body frame 219, and the reading reference plate 210 is urged toward the contact sensor 209 by its own weight or a spring (not shown). This conventional image reading apparatus is generally called a sheet feed type, and has a configuration in which a document is read in a main scanning direction while moving in a sub scanning direction.

In a color image reading apparatus, there are a plurality of light sources (in the above conventional example, RGB (red, green, blue)).
There is a case where a document reading unit is constituted by a contact sensor in which photoelectric conversion elements are arranged in a line, and each light source is sequentially turned on to perform color reading as read data in one line for each light source. General.

[0008]

In the above-described conventional color image reading apparatus, reading is performed while moving the original in the sub-scanning direction, and during that time, the RGB light sources are sequentially turned on (sequentially turned on). The read data for each line for each of RGB was not actually reading on the same one line. Therefore, when viewed microscopically, there is a problem that a color shift occurs in the read image because reading is performed in a state where RGB is shifted.

In detail, in a color copy function, a recorded image is not so noticeable unless a high-density recording system which exceeds the reading density due to pixel collapse / overlap due to recording is used. However, with the recent development of technology, higher recording density has been promoted, and there are printers capable of recording at 1200 dpi at present. In this case, when the reading density is set to 300 dpi, there has been a problem that the above-described color misregistration is recorded faithfully in a recorded image.

In the scanner function, an image once read can be magnified many times on a monitor by a PC, and can be confirmed on a pixel-by-pixel basis. Also in this case, it can be confirmed that the above-mentioned color shift has occurred.

In order to eliminate the above-mentioned color misregistration, a configuration is adopted in which RGB three colors are sequentially read with the original stopped.
Since reading is always started after the document is stopped, there is a problem that the reading time is unnecessarily long. Further, although the document is generally conveyed by rollers driven by a motor, if the stop / read / drive to the next line is repeated for each line, the conveyance state of the document is intermittent, and the paper conveyance accuracy is reduced. However, there is a problem that the motor vibration increases and noise increases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and has as its object to reduce the above-described color shift caused by color reading.

[0013]

In order to achieve the above object, in an image reading apparatus according to the present invention, a light source means for selectively emitting a plurality of different color lights to irradiate an original is provided. Reading means for reading the original line by line in the main scanning direction while relatively moving in the sub-scanning direction, and outputting image data; and, while the reading means reads one line, the color light from the light source means. Are sequentially and time-divisionally selected, and control means is provided for controlling one cycle in which all the color lights are selected to be repeated a plurality of cycles while reading the one line.

Further, in the image reading method according to the present invention, a plurality of different color lights are selectively emitted by a light source means to irradiate the original, and the original is moved relative to the original in the sub-scanning direction. In the image reading method of reading out each line in the main scanning direction and outputting image data, while reading one line of the original, the color lights are sequentially selected in a time-division manner, and all the color lights are selected. The cycle is repeated a plurality of cycles while reading the one line.

Further, in the storage medium according to the present invention,
A process of reading the original document line by line in the main scanning direction while moving in the sub-scanning direction relative to the original document, and outputting image data; Are sequentially selected in a time-division manner, and one cycle in which all the color lights are selected is repeated for a plurality of cycles while the one line is read, and a process for irradiating the original is stored. ing.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIG. 2 is a sectional view showing the overall configuration of a color image reading apparatus according to a first embodiment of the present invention. 2, the image reading apparatus includes a main body chassis 1, a control board 2 for controlling the apparatus, a power supply unit 3 for supplying power to the apparatus, an operation panel 4 for operating the apparatus, and an operation panel 4. A control board 5 and a document table 7 on which the document 6 is loaded are provided.

The document 6 is stacked on a document table 7 and a document auxiliary table 8, and guided in the width direction by a width regulating plate 9 for regulating the width direction of the document 6. When the separation roller 10 is rotated in the direction of the arrow by a drive motor (not shown), and the preliminary conveyance plate 11 is urged toward the separation roller 10, the plurality of originals 6 have a wedge shape between the friction piece 12 and the separation roller 10. Conveyed to the place. The plurality of originals 6 are separated one by one by the friction pieces 12, and the feeding roller 13a is rotated by a drive motor (not shown) in the direction of the arrow, and is conveyed with the urging force of the opposing auxiliary roller 13b. The document transport guide 14 guides the document 6 from the separation roller 10 to a contact sensor 15 described later.

Above the contact sensor 15 attached to the contact sensor attachment plate 15b, a reading reference plate 16 serving as a background color of the original and serving as a white reference in reading covers the entire reading width of the contact sensor 15. It is arranged with a wide width. A light source (not shown) (not shown) that irradiates the document 6 is arranged inside the contact sensor 15.

The original 6 read by the contact sensor 15 is rotated by a drive motor (not shown) in the direction of the arrow by a discharge motor 17a to obtain the urging force of the auxiliary roller 17b facing the original 6 and to move out of the image reading apparatus. It is discharged in the direction of arrow a.

FIG. 3 is an enlarged view of the contact sensor 15 and the contact sensor mounting plate 15b. In FIG. 3, an original glass 15a1 is provided on the paper passing surface on the upper surface side of the housing 15a, and a sensor substrate 15a4 on which a photoelectric conversion element 15a2 and an LED 15a3 for irradiating the original are mounted is mounted on the lowermost surface.

In this embodiment, three LEDs emitting three colors of RGB are used as the LEDs 15a3, and the LEDs 15a3 are arranged in parallel so that sufficient amounts of light can be obtained alternately for RGB.

When the LED 15a3 emits light, the light guide tube 15a5 illuminates the original 6 (not shown) passing through the upper surface of the original glass 15a1.
6 is transmitted (passed) and received by the photoelectric conversion element 15a2 to read an image. Note that d in the figure
Indicates the size (one line width) per read pixel.

Next, the color shift peculiar to the above-mentioned conventional light source switching method will be described. FIGS. 4A to 4D are views for explaining the mechanism of color misregistration, in which each LED of RGB irradiates the original 6 with respect to the size d per read pixel, and the photoelectric conversion element is used. FIG. 15a2 is a diagram showing the range of image data stored. In FIG. 4, while reading one line of the original in the main scanning direction, each color light of RGB is radiated sequentially in a time-division manner by ３ of the time that the original 6 advances by one line to obtain image data. .

First, FIG. 4A illuminates the R-LED. The document 6 is moving in the direction of the arrow (sub-scanning direction). The bold line shown above the document 6 is the read data of R. FIG. 4B shows the irradiation of the G-LED. At this time, since the original 6 is always moving in the direction of the arrow, R
There is a shift of 1/3 line between the read data of G and the read data of G.

In FIG. 4C, the B-LED is irradiated. At this time, the B read data is shifted by 2/3 line from the R read data, and is shifted by 1/3 line from the G read data. FIG. 4D shows reading of the next line.
The R-LED is irradiated again. At this time, the read data of R one line before is the size d per read pixel.
(1 line).

As described above, the deviation of the read data of each LED in FIG. 4 always occurs in the sequential lighting method by switching the light sources.

Next, an LED lighting method according to the present embodiment will be described with reference to FIG. FIGS. 1 (a) to 1 (h) show the relationship between the size d per read pixel and the RGB LEs.
D illuminates the original 6 and shows the range of image data accumulated by the photoelectric conversion element 15a2. In the present embodiment, as shown in FIG. 1, while reading one line in the main scanning direction of the original, each color light of RGB is sequentially turned on by 1/6 of the time that the original advances by one line in the sub-scanning direction. Irradiate in parts,
Image data is obtained by irradiating twice each.

First, FIG. 1A illuminates the R-LED. The document 6 is moving in the direction of the arrow (sub-scanning direction). The bold line described on the document 6 is the read data of R. FIG. 1B shows that the G-LED is illuminated next. At this time, since the original 6 is always moving in the direction of the arrow, R
There is a 1/6 line shift between the read data of G and the read data of G. In FIG. 1C, the B-LED is irradiated. At this time, the B read data is shifted by 1/3 line from the R read data, and is shifted by 1/6 line from the G read data.

FIG. 1D shows the second R in the same line.
-The LED is illuminated. It is shifted from the first read data of R by half the size d per read pixel. FIG. 1E shows a second G-LED on the same line.
Has been irradiated. The first G read data is the above d
Is shifted by half a minute. FIG. 1F illuminates a second B-LED on the same line. It is shifted by 1/2 of d from the first B read data.

FIG. 1 (g) shows the reading of the line next to the R-LED, and the R-LED is irradiated again. At this time, it is shifted by d from the read data of R one line before. FIG. 1H shows reading of the next line of the G-LED, and the G-LED is irradiated again. At this time, it is shifted by d from the read data of R one line before.

As described above, the data read a plurality of times on each line is added and summed to obtain data of one line. By doing so, the RGs that are sequentially turned on
According to the present embodiment, the shift of the reading position of the B3 color LED is 1/3 of one line in the conventional specification of FIG. 4 (each LED is turned on once per line). If
The shift is 1/6 of one line, and the shift can be reduced as compared with the conventional case.

Further, the quality of the apparatus can be improved without reducing the reading time, reducing the noise at the time of reading, not requiring replacement of parts, increasing the outer shape of the apparatus, increasing the cost of the apparatus, and improving the quality of the apparatus. It is possible to always provide a stable image to the user.

In the present embodiment, for the sake of simplicity, each LED that emits RGB color light is one LED.
The line is sequentially turned on twice each time. However, if the light is turned on more sequentially three times or more, for example, if the light is divided into five or ten parts on one line, the color shift can be greatly reduced. it can.

Further, in this embodiment, the sum of the read data of each color is taken as one line of read data. However, it is also possible to take an average value, that is, to make one read data from a plurality of read data. Therefore, the same effects as described above can be obtained regardless of the configuration.

(Second Embodiment) FIG. 5 is a cross-sectional view showing the overall configuration of a multifunction device having a facsimile function and a scanner function to be loaded into an external PC according to a second embodiment of the present invention. Is an external perspective view of the device.
Incidentally, as a recording system of the composite apparatus according to each of the following embodiments, an apparatus generally called an ink jet recording apparatus is employed.

First, the overall configuration of the multifunction device will be described with reference to FIGS. This composite device, as shown in FIG.
A paper feeding system A for supplying a recording sheet, a recording system B as a recording device, a reading system C for reading an image described on the document 103, and an operation unit D; A main body lower cover 102, a control board 102a for controlling the apparatus, and a power supply unit 1 for supplying power to the apparatus
02b.

First, the reading system C will be described. The reading system C irradiates the original 103 with light, converts the reflected light into an electric signal, and transmits this signal to another device or transmits it to its own recording system B according to the operation mode.

The document 103 is stacked on a document table 104 and a document auxiliary tray 105, and a document width regulating plate 106 (1 in FIG. 6).
06a and 106b) prevent skew in the width direction during transport. When the separation roller 107 is rotated by a drive motor (not shown) in the direction of the arrow and the preliminary conveyance plate 108 is urged toward the separation roller 107, the wedge shape of the friction piece 109 and the separation roller 107 Conveyed to the place. Then, the plurality of originals 103 are separated one by one by the friction pieces 109, and the feed roller 110a is rotated by a drive motor (not shown) in the direction of the arrow, and is conveyed with the urging force of the opposing auxiliary roller 110b. The document transport guide 111 guides the document 103 from the separation roller 107 to a contact sensor 112 described later.

Above the contact sensor 112 attached to the contact sensor attachment plate 112a, a reading reference plate 113, which serves as a background color of the original and becomes absolute white in reading, covers the entire reading width of the contact sensor 112. It is arranged in.

Further, inside the contact sensor 112, a light source (not shown) for irradiating the document 103 (in this embodiment, three LEDs emitting three colors of RGB light are used) is arranged. Then, the contact sensor 112
The document 103 read by the printer is discharged by the discharge roller 114a rotated by a drive motor (not shown) in the direction of the arrow, by the urging force of the opposing auxiliary roller 114b, and discharged out of the image reading apparatus in the direction of the arrow f. Documents are stacked on a document discharge tray 115. The document discharge tray 115 is configured to be movable in the direction of the arrow in FIG. 6, and is stored in the apparatus except for the reading operation. Further, in the reading control according to the present embodiment by turning on the RGB LEDs at the time of reading, the same control as in the first embodiment shown in FIG. 1 is performed.

Next, the operation section D will be described. The operation unit D is for performing operations such as a copy operation, a transmission operation, and a scanner operation. A key corresponding to various operations such as a dial key 116a and a display unit 116b are provided on the operation cover 116.
Is provided. The operation unit D is provided above the document conveying mechanism in the reading system C, and is configured to be rotatable in the direction of arrow g shown in FIG. Further, at one end of the operation unit D, a telephone line modular 102c1 for transmitting and receiving is provided.

Next, the paper feeding system A will be described. As the recording sheet 120, it is possible to use plain paper, a plastic sheet or the like and other materials that can transfer ink. For example, plain paper cut into B4 size or A4 size is used as the recording sheet 120. This recording sheet 120 (hereinafter referred to as recording paper)
By the recording paper height regulating plate 101a provided on the back of the main body upper cover 101, a limited number of recording papers are stored in the recording paper tray 121 and the recording paper auxiliary tray 122 which can be pulled out in the arrow direction. Further, the recording paper side guide 123 regulates the recording paper 120 in the width direction.

In FIG. 5, a pressure plate 124 provided at the bottom of the recording paper 120 is rotatably supported about a rotation shaft (not shown), and is controlled in rotation by a drive system (not shown). The recording paper 120 has a spring property so as to be conveyed in contact with the paper feed roller 125. The recording paper 125 conveyed by the rotation of the paper feed roller 125 in the direction of the arrow is separated by claw separation,
Each sheet is conveyed to the recording system B one by one.

Next, the recording system B will be described. As a recording system of a facsimile portion of the present multifunction apparatus, an apparatus generally called an ink jet recording apparatus is employed. In FIG. 5, a recording system B records an image on a recording sheet 120 supplied from a paper feeding system A in accordance with an image signal transmitted from another device or an image signal transmitted from a reading system C described later. It is.

The recording paper presser 126 is pressed against the LF roller 127, and serves as an upper guide for the recording sheet 120 conveyed from the paper feeding system A, and also serves as a pinch roller 126a.
Are opposed to the LF roller 127. Then, the recording sheet 120 is transported between the recording cartridge 128 and the platen plate 129, and the recording operation is performed by the recording cartridge 128. Here, the recording cartridge 128 is configured to perform serial printing while moving in the width direction of the recording sheet 120 by a motor and a driving system (not shown).

The recording sheet 120 after printing is conveyed to the outside of the apparatus by the spur roller 130b facing the discharge roller 130a so as not to stain the printing surface, and is moved from the discharge cover 131 in the direction of arrow e. The sheets are stacked on the discharge auxiliary tray 132. The paper discharge auxiliary tray 132 is configured to be movable in the direction of the arrow as shown in FIG.

In FIG. 7, the document loading table 104 is supported by a rotation center (not shown) provided on the main body upper cover 101 so as to be rotatable in the direction of arrow h. Thus, the recording cartridge 128 can be attached and detached in the direction of arrow i.

FIG. 8 is a block diagram showing a control system of the multifunction peripheral according to the present embodiment. 8, a control unit 102a for controlling the present apparatus, a power supply unit 102b for supplying power to the entire apparatus, and a modem board unit 1
02a1 and a communication board unit 102 for connecting a telephone.
c and a display unit 1 for displaying the contents input from the operation unit D and the like.
16b and the like are arranged.

The control unit 102a includes a CPU 102a2 for controlling the entire apparatus, a ROM 102a3 for storing various programs and various data, and the like.
The RAM 102a4 is used as a work area for a2, temporarily stores various data such as the number of recordings, and stores and registers various data, and has an input / output switching interface 102a8.

The line memory 102a5 stores an image of each line of image data. In the case of transmitting or copying a document, one line of image data from the document reading system C is stored. In the case of data reception, one line of decoded data is stored.
The image data stored in the line memory 102a5 is added with a recording system control code by the CPU 102a2 and output from the input / output switching interface 102a8 to the CPU B1 of the recording system B. Then, the image is recorded by the CPU B1 decoding the recording system control code.

The encoding / decoding section 102a6 encodes the image information to be transmitted by MH coding or the like, or decodes the received coded image data to convert it into image data. The buffer memory 102a7 stores the transmitted and received encoded image data. The peripheral computer E can output image data and text data to the recording system B via the printer interface 102a9. Further, the image data read by the reading system C can be taken into the peripheral computer E.

Next, a description will be given of a modification of each unit in the multifunction peripheral according to the second embodiment. In the second embodiment, the ink jet recording method is used. However, an electrophotographic recording method using a toner (laser beam printer) or a thermal transfer recording method using an ink sheet and a thermal head may be used. .

Although the contact sensor is used as the reading means in the second embodiment, it may be constituted by a reduction optical system using a light source and a CCD. Further, in the above-described second embodiment, the mechanism of the paper feeding system uses the claw separation system.
Other separation methods such as friction separation and liquid separation may be employed.

(Third Embodiment) In each of the embodiments described above, the light source switching system for switching the lighting of a plurality of light sources is used. However, the present embodiment is applied to a filter switching system. The filter switching method uses one white light source and a plurality of color filters that transmit the white light to obtain each color light of CMY (cyan, magenta, yellow), and sequentially switches and selects each filter in a time-division manner. Then, the original is irradiated. Therefore, the same problem of color shift as in the light source switching method occurs in this filter switching method.

Therefore, in the present embodiment, each of the filters is selected a plurality of times in a time-division manner while reading the same line, and the original is read in the same manner as in the operation of FIG. By irradiating, the color misregistration is reduced as in each embodiment.

Next, a storage medium according to another embodiment of the present invention will be described. The present invention can be realized by a hardware configuration, but can also be realized by a computer system configuration including a CPU and a memory. When configured in a computer system, the memory constitutes a computer-readable storage medium according to the present invention.

That is, a storage medium storing a program code of software for executing the operation shown in FIG. 1 described in each of the above embodiments is used in a system or an apparatus, and the CPU of the system or apparatus stores the program code in the storage medium. The object of the present invention can be achieved by reading and executing the program code thus read.

As the storage medium, ROM, R
Semiconductor memory such as AM, optical disk, magneto-optical disk,
A magnetic medium or the like may be used, and these may be configured and used in a CD-ROM, a floppy disk, a magnetic tape, a magnetic card, a nonvolatile memory card, or the like.

Therefore, by using this storage medium in a system or apparatus other than the system or apparatus shown in FIG. 8, the system or computer reads out and executes the program code stored in this storage medium. The same functions as those of the above embodiments can be realized, the same effects can be obtained, and the object of the present invention can be achieved.

An OS running on a computer
When performing part or all of the processing, or after the program code read from the storage medium is written to a memory provided in an extended function board or an extended function unit connected to the computer, Even when the CPU or the like provided in the above-mentioned extended function board or extended function unit performs part or all of the processing based on the instruction of the program code, the same functions as those in the above embodiments can be realized and the same Effect can be obtained,
The object of the present invention can be achieved.

[0061]

As described above, according to the present invention,
The following effects can be obtained. According to the first, twelfth, and thirteenth aspects, it is possible to reduce color shift that occurs when a light source switching method, a filter switching method, or the like is employed. According to the second and third aspects of the present invention, in addition to the effects obtained by the first aspect of the present invention, it is possible to further uniform the color shift.

[Brief description of the drawings]

FIG. 1 is a timing chart for explaining light source lighting control and reading control according to first to third embodiments of the present invention.

FIG. 2 is a cross-sectional view illustrating an overall configuration of the image reading device according to the first embodiment of the present invention.

FIG. 3 is an enlarged view of a contact sensor and a contact sensor mounting plate of FIG. 2;

FIG. 4 is a timing chart for explaining a mechanism of color misregistration in a conventional light source switching method.

FIG. 5 is a sectional view showing a multifunction peripheral according to a second embodiment of the present invention.

FIG. 6 is an external perspective view of a multifunction peripheral according to a second embodiment.

FIG. 7 is a sectional view showing a multifunction peripheral according to a second embodiment.

FIG. 8 is a block diagram illustrating a control system of the multifunction peripheral according to the second embodiment.

FIG. 9 is a cross-sectional view illustrating a conventional image reading apparatus.

[Explanation of symbols]

 7 Document Table 11 Preliminary Transport Plate 13a Transport Roller 13b Auxiliary Roller 14 Document Transport Guide 15a2 Photoelectric Conversion Element 2 Control Board 4 Operation Panel 6 Document 15 Contact Sensor 15a3 LED A Paper Feeding System C Reading System B Recording System D Operating Unit 102a Control Unit 102a1 CPU 102a4 RAM 102a6 Encoding / decoding unit 102a3 ROM 102a5 Line memory 102a7 Buffer memory 102a8 I / O switching interface 102a9 Printer interface 102c Communication board unit 103 Document 108 Preliminary transport plate 110a Feed roller 111 Document transport guide 112 Contact sensor

Claims (13)

[Claims] 1. A light source means for selectively emitting a plurality of different color lights to irradiate a document, and reading the document line by line in the main scanning direction while moving in the sub-scanning direction relative to the document. Reading means for outputting image data, while the reading means reads one line, sequentially selects each color light from the light source means in a time-division manner, and sets one cycle in which all the color lights are selected as An image reading apparatus provided with control means for performing control so as to repeat a plurality of cycles while reading one line. 2. The data obtained by adding image data obtained for each color light while reading one line for each color light to obtain image data of each color obtained by reading the line. The image reading device according to claim 1. 3. The image data of each color obtained by averaging image data obtained for each color light for each color light while reading one line is used as image data of each color read from the line. The image reading device according to claim 1. 4. An image reading apparatus according to claim 1, wherein said light source means comprises a plurality of light sources emitting different color lights, and said control means selectively turns on said plurality of light sources. 5. The light source unit includes a light source that emits white light and a plurality of filters that transmit the white light and output the plurality of color lights, and the control unit switches and selects the plurality of filters. 2. The method according to claim 1, wherein
The image reading device according to claim 1. 6. The image reading apparatus according to claim 1, wherein the plurality of color lights are red, green, and blue color lights. 7. The image reading apparatus according to claim 1, wherein the plurality of color lights are cyan, magenta, and yellow. 8. The image reading apparatus according to claim 1, wherein the photoelectric conversion element forming the reading unit has a size equal to or larger than a width of the line. 9. The image reading apparatus according to claim 1, further comprising a conveying unit for moving the original in the sub-scanning direction. 10. A facsimile means for facsimile transmitting said image data.
The image reading device according to claim 1. 11. The image reading apparatus according to claim 1, further comprising a transmission unit that transmits the image data to an external computer. 12. A light source means for selectively emitting a plurality of different color lights to irradiate a document, and reading the document line by line in the main scanning direction while moving the document relative to the document in the sub-scanning direction. In the image reading method for outputting image data, while reading one line of the original, each color light is sequentially selected in a time-division manner, and one cycle in which all the color lights are selected is performed while the one line is read. An image reading method, wherein the method is repeated a plurality of times. 13. The original is read line by line in the main scanning direction while moving in the sub-scanning direction relative to the original,
A process of outputting image data, and while reading one line of the original, a plurality of different color lights are sequentially selected in a time-division manner by the light source means, and the one line is read for one cycle in which all the color lights are selected. A computer-readable storage medium storing a program for executing a process of irradiating the document by repeatedly emitting light during a plurality of cycles.