JP2009296229A - Image reader, control method of image reader, and control program of image reader - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve performance of document size detection with respect to an image reader which reads a document using a plurality of imaging elements arrayed in two dimensions. <P>SOLUTION: The image reader reads the document using the plurality of pixel units arrayed in two dimensions. Each of the pixel units includes a light source portion which irradiates the document with light and a photoelectric conversion portion which detects reflected light from the document. The document size detection is performed before a document image is read. Pixel units which are spaced longitudinally and laterally at predetermined intervals, among the plurality of pixel units of a read section 2 enter a light emission and imaging state as active pixels 10. Edge positions of the document 6 are specified from a distribution of output varying pixels and non-varying pixels. A fixed-form size which is closest to an edge area of the document is selected as a document size from the edge area of the document. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an image reading apparatus, an image reading apparatus control method, and an image reading apparatus control program, and more particularly to an image reading apparatus capable of reading a two-dimensional image, an image reading apparatus control method, and an image reading apparatus. It relates to the control program.

  An electrophotographic image forming apparatus (scanner function, facsimile function, copying function, function as a printer, data communication function, and MFP (Multi Function Peripheral) having a server function, facsimile apparatus, copying machine, etc.) A scanner (an example of an image reading apparatus) that reads an image from a document is provided.

  As a structure of a scanner, one that acquires a two-dimensional image by mechanically scanning a plurality of image pickup devices arranged in one dimension is common. There has also been proposed a scanner that reads an image in a short time using a two-dimensional contact area sensor without a mechanical movement mechanism. Such a scanner performs two-dimensional reading by arranging a plurality of pixels vertically and horizontally. One pixel area is divided into a light emitting area and a light receiving area. The elements in the light emitting area emit light, and the reflected light from the original is received by the elements in the light receiving area (photoelectric conversion unit), whereby image data in the pixel is acquired.

  Since such an apparatus does not require mechanical scanning, problems such as instability, durability deterioration, and noise associated with scanning can be eliminated, and the apparatus can be miniaturized. Therefore, these devices are attracting attention as new document reading devices.

  In a scanner that scans a one-dimensional sensor, a document size is detected by using a detection signal from a document size detection sensor or a detection signal read by a one-dimensional sensor.

  In a scanner using a two-dimensional contact area sensor, it is conceivable to read document information with a two-dimensional sensor unit for reading a document image and determine the size of the document based on the information.

In Patent Document 1 below, a pixel included in an area sensor is provided with an EL (electroluminescence) element as a light source and a photodiode as a photoelectric conversion element, and the operation of the EL element and the photodiode is controlled by a TFT (thin film transistor). A close contact area sensor is described.
JP 2001-292276 A

  When a two-dimensional sensor for reading a document image is used to detect a document size based on image information on the entire surface, there is a problem that it takes time to determine the size due to the large number of read pixels. For example, if an A3 document is read at 600 dpi, processing of 75 million pixels is necessary if it is read at 1200 dpi. Moreover, since all the pixels emit light, there is a lot of energy loss, and there is a problem that makes the user feel dazzling.

  The present invention has been made to solve such a problem. In an image reading apparatus that reads a document using a plurality of two-dimensionally arranged image sensors, the document detection performance can be improved. An object of the present invention is to provide an image reading apparatus, a method for controlling the image reading apparatus, and a control program for the image reading apparatus.

  In order to achieve the above object, according to one aspect of the present invention, an image reading apparatus is an image reading apparatus that reads a document using a plurality of pixel units arranged two-dimensionally, and each of the plurality of pixel units. Includes a light source unit that irradiates a document and a photoelectric conversion unit that detects light from the document, an image processing unit that converts signal charges generated by the photoelectric conversion unit into image data, and a plurality of pixel units, And detecting means for detecting the presence or absence of the document at the specific position based on the signal charge of the photoelectric conversion unit at the specific position.

  Preferably, the detection unit detects the size of the document by setting the pixel portions at a plurality of specific positions to an imaging state and detecting the presence or absence of the document at the plurality of specific positions.

  Preferably, the image reading apparatus detects the size of the document again by changing a plurality of specific positions after roughly detecting the size of the document by the detecting unit.

  Preferably, the detection unit causes only the pixel portion at the specific position to emit light.

  Preferably, the image reading apparatus reads image information only in a range where the document exists when reading the image of the document after detection by the detection unit.

  Preferably, the detection unit causes the pixel portion at the specific position to emit light with a luminance for detecting the presence / absence of the document, and the luminance for detecting the presence / absence of the document is lower than the luminance when reading the image of the document.

  Preferably, the detection unit changes the light emission state of the pixel portion at the specific position at a predetermined timing, and only the pixel portion that detects the reflected light at the timing is set as the pixel portion that detects the document, thereby reducing the document range. To detect.

  Preferably, the detection means performs detection processing by a processing unit different from the image processing unit.

  Preferably, the plurality of pixel units are controlled to emit light independently for each pixel unit, and the image reading apparatus emits only the light source unit in the reading target pixel and acquires the image signal of the reading target pixel.

  Preferably, the light source unit includes an electroluminescence element, and light emission thereof is controlled by a thin film transistor arranged for each pixel.

  Preferably, the light source unit includes a white backlight light source, a color filter, and a liquid crystal panel, and light emission thereof is controlled by a thin film transistor disposed for each pixel.

  According to another aspect of the present invention, in the control method of an image reading apparatus that reads a document using a plurality of pixel units arranged two-dimensionally, each of the plurality of pixel units includes a light source unit that irradiates the document and A photoelectric conversion unit that detects light from the document, and a method for controlling the image reading apparatus includes: an image processing step that converts signal charges generated in the photoelectric conversion unit into image data; and a plurality of pixel units And a detection step of detecting the presence or absence of the document at the specific position based on the signal charge of the photoelectric conversion unit at the specific position.

  According to still another aspect of the present invention, in a control program for an image reading apparatus that reads a document using a plurality of pixel units arranged two-dimensionally, each of the plurality of pixel units is a light source unit that irradiates the document. And a photoelectric conversion unit that detects light from the document, and a control program for the image reading device includes an image processing step for converting signal charges generated by the photoelectric conversion unit into image data, and a plurality of pixel units, A pixel portion at a specific position is set in an imaging state, and a detection step of detecting the presence or absence of a document at the specific position is executed by the computer based on the signal charge of the photoelectric conversion unit at the specific position.

  According to these inventions, in an image reading apparatus that reads a document using a plurality of two-dimensionally arranged image sensors, an image reading apparatus capable of improving document detection performance, a method for controlling the image reading apparatus, and It is possible to provide a control program for the image reading apparatus.

  Hereinafter, an image reading apparatus according to an embodiment of the present invention will be described. The image reading apparatus includes a plurality of imaging elements arranged in a two-dimensional manner. The image reading apparatus has a light source switching method (with a light source of R (red) → G (green) → B (blue) of equal magnification imaging (the resolution of the sensor (imaging device) itself is equal to the reading resolution of the document itself). A method of obtaining a color image by switching in order is employed. In other words, the image reading apparatus is a contact type two-dimensional image reading apparatus that reads image information of a document with an area type image sensor unit, and performs photoelectric conversion and image processing.

  The image reading apparatus includes a light-emitting layer, a light-emission control unit that controls light emission luminance and light-emission timing, a photoelectric conversion layer that detects reflected light of a placed document, and a signal charge generated in the photoelectric conversion layer as an image signal. And an image signal control unit for processing as described above.

  A photodiode is used as the image sensor. One pixel includes an EL element, a photodiode, and a thin film transistor. The light source need not be an EL element.

  [First Embodiment]

  FIG. 1 is a perspective view showing an appearance of the image reading apparatus according to the first embodiment of the present invention.

  Referring to the figure, an image reading apparatus 1 includes a reading unit 2 including a plurality of image pickup elements arranged in two dimensions.

  FIG. 2 is a plan view of the image reading apparatus.

  The reading unit 2 includes a plurality of pixel units 3. One pixel unit 3 includes a light source unit 4 and a sensor unit 5. The light source unit includes a RED light source, a GREEN light source, and a BLUE light source (each shown by different hatching).

  FIG. 3 is a diagram illustrating an outline of a cross-sectional configuration of the reading unit 2.

  The reading unit 2 is configured to sandwich the light source / sensor layer 8 between an ITO (indium tin oxide) layer 7 and a substrate 9 for power supply and control.

  At the time of image reading, power is supplied to the light source 4 of the light source / sensor layer 8 of the lighting target pixel, and the pixel is turned on. The generated light passes through the transparent ITO layer 7 and is irradiated onto the document 6 placed on the upper surface of the ITO layer 7. As a result, reflected light corresponding to the density of the document is generated.

  The sensor unit 5 of the pixel to be read receives reflected light from the original and generates a voltage corresponding to the reflected light by photoelectric conversion. A voltage generated at each pixel is detected, and a two-dimensional image of the document is reconstructed by the image processing unit.

  The light source unit 4 of each pixel unit 3 lights up three colors of red, blue, and green sequentially, and color reading is possible by detecting the voltage generated in the sensor unit 5 when the light of each color is turned on. .

  Regarding the lighting of the light source, only the light source of the reading target pixel may be turned on with respect to the reading target pixel, the light sources of the adjacent pixels may be turned on, or the light sources of all the pixels may be turned on.

  FIG. 4 is a block diagram illustrating a circuit configuration of the image reading apparatus.

  The reading unit 2 is provided with a plurality of pixel units 3 vertically and horizontally. Which pixel in the X and Y directions is caused to emit light by the column direction driving circuit 125 and the row direction driving circuit 127, which pixel in the X and Y directions is to be read, and which pixel in the X and Y directions is emitted. Whether to be in a standby state where neither reading nor reading is performed is controlled. The column direction driving circuit 125 and the row direction driving circuit 127 have a function of an image signal control unit that processes a signal charge generated in the photoelectric conversion layer of the pixel unit 3 as an image signal.

  In each pixel portion, a thin film transistor is arranged, and thereby light emission is controlled.

  Each of the column direction driving circuit 125 and the row direction driving circuit 127 is connected to the driving circuit 123 and driven by the CPU 121. That is, the reading unit 2 starts a reading operation in accordance with an external reading command, and the read data obtained thereby is output via the CPU 121.

  FIG. 5 is a block diagram illustrating a functional configuration of the signal processing unit of the image reading apparatus.

  The signal processing unit of the image reading apparatus includes a power supply unit 11 that supplies power to the reading unit 2 and a control unit 12 that controls the reading unit 2. The control unit 12 includes a control unit 13 that controls the reading unit 2, a document size detection unit 14, and an image processing unit 15.

  During normal document reading, an image read by the reading unit 2 is converted into image data by the image processing unit 15. When the document size is detected, the image read by the reading unit 2 is input to the document size detection unit 14 via the control unit 13. The document size detection unit 14 determines the document size area.

  The image processing unit 15 performs processing such as shading correction and edge enhancement. By not performing such processing in the document size detection unit 14, the document size can be determined at high speed.

  FIG. 6 is a diagram for explaining a document size detection state of the reading unit.

  The document size detection is executed before reading the document image. Among the plurality of pixel units of the reading unit 2, some of the pixel units are in the light emission and imaging state as the active pixels 10. Here, the active pixels 10 are pixel portions arranged in a plurality of vertical and horizontal directions with predetermined intervals in the vertical and horizontal directions. The arrangement of the active pixels 10 may be arbitrary.

  The active pixel 10 emits light with a luminance necessary to detect the presence or absence of a document at that position. This is a lower (darker) luminance than when reading a document image. This is because, as long as the presence / absence of a document is only detected, the amount of light is not as high as when a document image is read.

  FIG. 7 is a diagram for explaining processing when detecting the document size.

  The output of the sensor unit 5 in each pixel unit of the active pixel 10 is detected. The document size detection unit 14 specifies the position of the document edge from the distribution of the output variation pixel and the non-change pixel.

  In the example of FIG. 7, the coordinate of the upper left active pixel 10 of the reading unit 2 is P (x, y) = (1, 1), and the right direction is the plus direction and the x coordinate is taken. Also, the y coordinate is taken with the downward direction as the positive direction. The near side when viewed from the user is the positive direction of the y axis, and the right side is the positive direction of the x axis.

  FIG. 8 is a diagram showing the output of each active pixel in the state of FIG.

  When an original is placed with the light source portion of each active pixel emitting light, the output of the pixel in which the presence of the original is detected fluctuates, and the output of the pixel in which the presence of the original is not detected does not fluctuate. As a result, it is possible to detect the presence / absence, position and size of the document.

  If the area of the document 6 is as shown in FIG. 7, in the front-rear direction, P (x, m) and P (x, m + 1) active pixels, and in the left-right direction P (n, y) It can be determined that there is a document edge between P (n + 1, y) active pixels.

  The document size detection unit 14 selects a standard paper size closest to the corresponding area from the document edge area. That is, the document size detection unit 14 stores in advance a standard paper size such as A5, A4, A3, B4, and B5 in the memory, and determines the standard paper size of the closest size from the detection result of the presence or absence of the document in the active pixel. The size of the document being read. The control unit 13 designates a reading range of the standard size in the reading unit 2 and reads an image using only the pixel portion in the range.

  FIG. 9 is a flowchart showing document size detection and document reading processing in the first embodiment.

  Referring to the figure, in step S101, the active pixel is set in the document detection state, and the fluctuation of the signal charge of the sensor unit is detected. At this time, the active pixel is lit with the first luminance.

  In step S103, the position of the document edge is specified from the distribution of the sensor output fluctuation pixels and the non-change pixels (FIG. 8). For example, in the example of FIGS. 7 and 8, the front-rear direction is between P (x, m) and P (x, m + 1), and the left-right direction is between P (n, y) and P (n + 1, y). Calculate that there is a document edge.

  In step S105, the standard paper size closest to the area is selected from the document edge area.

  In step S107, the original image in the area of the standard paper size is read by the sensor. At this time, the pixel portion in the area of the standard paper size is lit with the second luminance. The second luminance is brighter than the first luminance.

  [Second Embodiment]

  Since the configuration of the image reading apparatus in the second embodiment is the same as that of the image reading apparatus in the first embodiment, description thereof will not be repeated here. Here, differences between the image reading apparatus according to the second embodiment and the image reading apparatus according to the first embodiment will be described.

  The image reading apparatus according to the second embodiment executes a processing procedure for detecting the document size in more detail than the image reading apparatus according to the first embodiment.

  FIG. 10 is a diagram for explaining processing when the document size is detected by the image reading apparatus according to the second embodiment.

  The output of the sensor unit 5 in each pixel unit of the active pixel 10 is detected. The document size detection unit 14 specifies the position of the document edge based on the distribution of the output variation pixel and the non-variation pixel.

  Assuming that the area of the document 6 is as shown in FIG. 10, in the front-rear direction, P (x, m) and P (x, m + 1) are active pixels, and in the left-right direction, P (n, y) It can be determined that there is a document edge between P (n + 1, y) active pixels.

  From the result, the front-rear direction is P (x, m + (1/2)) between P (x, m) and P (x, m + 1), and the left-right direction is P (n, y) and P ( An active pixel is newly provided at a position of P (n + (1/2), y) between (n + 1, y) (addition of active pixels). In the added active pixel portion, the presence or absence of a document is detected. As a result, the actual edge of the document is closer to the active pixel of P (x, m) and P (x, m + 1) in the front-rear direction, or P (n, y) and P (n + 1) in the left-right direction. , Y), it can be determined which side of the active pixel is closer to.

  That is, if a document is detected with the added active pixel, the document edge is between the active pixel farther from the origin P (1, 1) and the added active pixel, and the added active pixel. If the document is not detected by the pixel, it can be determined that the document edge is between the active pixel near the origin P (1, 1) and the added active pixel.

  In order to know the exact position of the document edge between the added active pixel and the first detected active pixel, the added active pixel, the first detected active pixel, An intermediate pixel is set as a new active pixel. By repeating such processing, it is possible to limit the document edge range and detect the accurate document size at high speed. That is, after determining the size of the document by rough detection, detailed size determination processing is performed based on the result.

  The control unit 13 designates a reading range of the document size finally obtained by the reading unit 2, and reads an image using only the pixel portion within the range.

  FIG. 11 is a flowchart showing document size detection and document reading processing in the second embodiment.

  Referring to the figure, in step S201, the first active pixel is set in the original detection state, and the signal charge fluctuation of the sensor unit is detected (this detection is the same as the detection in the first embodiment of FIG. 7). is there). The active pixel is lit with the first luminance.

  In step S203, the range of the document edge is detected from the distribution of the sensor output fluctuation pixels and the non-change pixels (FIG. 8). For example, in the example of FIGS. 7 and 8, the document is between P (x, m) and P (x, m + 1) in the front-rear direction and between P (n, y) and P (n + 1, y) in the left-right direction. Calculate that there is an edge.

  In step S205, the pixel at the boundary of the document edge is set as a new active pixel. That is, in the example shown in FIG. 10, the front-rear direction is P (x, m + (1/2)) between P (x, m) and P (x, m + 1), and the left-right direction is P (n , Y) and P (n + (1/2), y) between P (n + 1, y) are changed to active pixels.

  In step S207, the document edge range is re-detected from the sensor output fluctuation distribution of the active pixel added in step S205.

  In step S209, the same processing as in steps S205 to S207 is repeated, the document edge range is gradually narrowed to specify the document area, and the document image in the specified document area is read by the sensor. At this time, the pixel portion of the specified document area is lit with the second luminance. The second luminance is brighter than the first luminance.

  [Third Embodiment]

  Since the configuration of the image reading apparatus in the third embodiment is the same as that of the image reading apparatus in the first or second embodiment, description thereof will not be repeated here. Here, differences between the image reading apparatus according to the third embodiment and the image reading apparatus according to the first or second embodiment will be described.

  The image reading apparatus according to the third embodiment executes processing for preventing a document size detection error due to external light.

  FIG. 12 is a diagram illustrating a light emission pattern of the light source unit when the document size is detected by the image reading apparatus according to the third embodiment.

  When the document size is detected by the detection method shown in the first or second embodiment, the sensor unit detects the reflected light due to the light emission of the light source unit, thereby determining the presence or absence of the document at the position of the sensor unit. The However, there is a possibility that the sensor unit erroneously detects fluctuations in external light and the document size is not correctly detected. In order to prevent such erroneous detection, in the present embodiment, as shown in FIG. 12A, light emission timing (light emission state and luminance change state) on the light source side is shifted by RGB to emit light. Characterize (modulate) the sequence. The pixel portion where the reflected light at the timing is detected is the pixel portion where the document is detected.

  That is, a sensor output having a light emission sequence characteristic is detected in a portion of the active pixel 10 where a document is present, although the shape of the detected waveform varies depending on the color and density of the document. In the portion of the active pixel 10 where there is no document, even if the sensor output changes due to fluctuations in external light, a sensor output having characteristics different from the light emission sequence is detected.

  That is, in contrast to the light emission of the light source of the active pixel in FIG. 10A, as shown in FIG. A signal corresponding to the light emission is output. On the other hand, a signal corresponding to the light emission of the light source is not output in a portion where there is no document. This makes it possible to accurately determine the presence or absence of a document at the active pixel position.

  The change in luminance level and the light emission duty may be aligned for each color, or the change in luminance level and the light emission duty may be modulated for each color.

  [Effects of the embodiment]

  With the above configuration, in the contact-type two-dimensional image reading apparatus having a plurality of pixels, in order to detect the presence and size of the placed document, the pixel at a specific position is set in the light emission / imaging state, and detection signal information of the pixel is detected. By using, the document size can be specified. Further, by setting only the pixel at a specific position to the light emission / imaging state, there is an effect that energy loss is suppressed, the time required to determine the size is shortened, and the user is not dazzled.

  In addition, since only the detected range of the document is imaged, there is an effect that unnecessary light emission and reading need not be performed and unnecessary power can be reduced.

  Further, the accuracy of the detected document range can be improved by changing the range and density of the pixels (active pixels) in the light emission / imaging state set for document detection after the document detection.

  In addition, unlike the document image reading, the luminance of the light source for document detection is changed to a level at which document detection is possible (the amount of light is reduced), and there is an effect that wasteful power can be reduced.

  Further, by adding specific modulation information to the light source for document detection, it is possible to distinguish between signal information by reflected light from the document and signal information by external light (signal charge generated by external light).

  Further, by providing a detection signal processing unit different from the image processing unit for image data conversion for image size detection, wasteful processing for document size detection can be omitted, and high-speed detection becomes possible. There is an effect.

  [Others]

  As the light source of the pixel portion, an electroluminescence element may be used, and light emission may be controlled by a thin film transistor disposed for each pixel, or a white backlight light source, a color filter, and a liquid crystal panel may be used for each pixel. The light emission may be controlled by a thin film transistor.

  The image reading apparatus may be provided in an image forming apparatus such as a monochrome / color copying machine, a printer, a facsimile machine, or a multifunction peripheral (MFP) thereof.

  The processing in the above-described embodiment may be performed by software or by using a hardware circuit.

  In addition, a program for executing the processing in the above-described embodiment can be provided, and the program is recorded on a recording medium such as a CD-ROM, a flexible disk, a hard disk, a ROM, a RAM, and a memory card and provided to the user. You may decide to do it. The program may be downloaded to the apparatus via a communication line such as the Internet.

  In addition, it should be thought that the said embodiment is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

1 is a perspective view showing an external appearance of an image reading apparatus according to a first embodiment of the present invention. It is a top view of an image reading apparatus. FIG. 3 is a diagram illustrating an outline of a cross-sectional configuration of a reading unit. It is a block diagram which shows the circuit structure of an image reading apparatus. It is a block diagram which shows the function structure of the signal processing part of an image reading apparatus. FIG. 6 is a diagram for explaining a document size detection state of a reading unit. FIG. 10 is a diagram for explaining processing when detecting a document size. It is a figure which shows the output of each active pixel in the state of FIG. 3 is a flowchart illustrating document size detection and document reading processing in the first embodiment. FIG. 10 is a diagram for describing processing when detecting an original size of an image reading apparatus according to a second embodiment. 10 is a flowchart illustrating document size detection and document reading processing according to the second embodiment. It is a figure which shows the light emission pattern of the light source part at the time of the document size detection of the image reading apparatus in 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Two-dimensional image reader 2 Reading part 3 Pixel part 4 Light source part 5 Sensor part 6 Manuscript 7 ITO layer 8 Light source / sensor layer 9 Substrate 10 Active pixel (light emission and imaging state pixel)
DESCRIPTION OF SYMBOLS 11 Power supply part 12 Control part 13 Control part 14 Original size detection part 15 Image processing part

Claims (13)

An image reading apparatus that reads a document using a plurality of pixel units arranged two-dimensionally,
Each of the plurality of pixel portions is
A light source unit for irradiating the document;
A photoelectric conversion unit that detects light from the document,
An image processing unit that converts signal charges generated in the photoelectric conversion unit into image data;
A detection unit configured to detect a presence / absence of a document at the specific position based on a signal charge of the photoelectric conversion unit at the specific position based on a signal charge of the photoelectric conversion unit at the specific position among the plurality of pixel units; Image reading device.   The image reading apparatus according to claim 1, wherein the detection unit detects the size of the document by setting pixel portions at a plurality of specific positions to an imaging state and detecting the presence or absence of the document at the plurality of specific positions.   The image reading apparatus according to claim 2, wherein the size of the original is detected again by changing the plurality of specific positions after the detection unit roughly detects the size of the original.   The image reading apparatus according to claim 1, wherein the detection unit causes only the pixel portion at the specific position to emit light.   5. The image reading apparatus according to claim 1, wherein after reading by the detection unit, when reading an image of a document, image information of only a range where the document exists is read. The detection means causes the pixel portion at the specific position to be in a light emitting state with luminance for detecting presence or absence of a document,
6. The image reading apparatus according to claim 1, wherein the luminance for detecting presence / absence of a document is lower than a luminance at the time of reading an image of a document.   The detection means changes the light emission state of the pixel portion at the specific position at a predetermined timing, and only the pixel portion that detects the reflected light at the timing is set as the pixel portion that detects the document, thereby reducing the document range. The image reading apparatus according to claim 1, wherein the image reading apparatus is detected.   The image reading apparatus according to claim 1, wherein the detection unit performs detection processing by a processing unit different from the image processing unit. The plurality of pixel portions are controlled to emit light independently for each pixel portion,
The image reading apparatus according to claim 1, wherein only the light source unit in the reading target pixel emits light and acquires an image signal of the reading target pixel.   The image reading apparatus according to claim 1, wherein the light source unit includes an electroluminescence element, and light emission is controlled by a thin film transistor disposed for each pixel.   The image reading device according to claim 1, wherein the light source unit includes a white backlight light source, a color filter, and a liquid crystal panel, and light emission is controlled by a thin film transistor arranged for each pixel. A method for controlling an image reading apparatus that reads a document using a plurality of pixel units arranged two-dimensionally,
Each of the plurality of pixel portions is
A light source unit for irradiating the document;
A photoelectric conversion unit that detects light from the document,
An image processing step of converting signal charges generated in the photoelectric conversion unit into image data;
A detection step of detecting a presence or absence of a document at the specific position based on a signal charge of the photoelectric conversion unit at the specific position based on a signal charge of the photoelectric conversion unit at the specific position among the plurality of pixel portions; A method for controlling an image reading apparatus. A control program for an image reading apparatus that reads a document using a plurality of pixel units arranged two-dimensionally,
Each of the plurality of pixel portions is
A light source unit for irradiating the document;
A photoelectric conversion unit that detects light from the document,
An image processing step of converting signal charges generated in the photoelectric conversion unit into image data;
A detection step for detecting the presence or absence of a document at the specific position based on the signal charge of the photoelectric conversion unit at the specific position is executed on a computer based on the signal charge of the photoelectric conversion unit at the specific position among the plurality of pixel portions in an imaging state. An image reading apparatus control program.

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