JP2005197807A - Image reading apparatus and image processing system, method of controlling image reading apparatus, program, and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To overcome the problem of a conventional image reading apparatus that it takes much time until a cold cathode fluorescent lamp (hereinafter called CCFL) used for the conventional image reading apparatus reaches the luminance required for image reading when the CCFL is once turned off according to the characteristics of the CCFL because a reflection original light source and a transparent original light source have to be switched in order to detect dust/flaw information, and to provide a technology capable of detecting the dust/flaw information without the need for turning off the transparent original light source. <P>SOLUTION: The image reading apparatus disclosed herein includes: a first light source located at a first side with respect to an original; a second light source located on a second side opposite to the first side with respect to the original; a data acquisition means for receiving light emitted from the first light source and transmitted through the original and light emitted from the second light source and reflected on the original to acquire electric image data; and a control means for controlling operations of the first and second light sources and the data acquisition means. The control means moves the first light source to a position at which the data acquisition means does not receive the light emitted from the first light source when both of the first and second light sources are lit. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an image processing technique for reading and processing image information of a document.

  In recent years, with the development of communication networks, faster computers, and larger storage media, higher image quality has been demanded in handling color image information. There is an increasing demand to read information more accurately at high speed and with high image quality.

  In addition, the demand for image reading of photographic film is also increasing. The demand for reading photographic film image information in a sleeve form having a plurality of frames more accurately, at high speed and with high image quality is increasing. As a method of reading a film with higher image quality, a proposal has been made to remove dust and scratches on the film (see, for example, Patent Document 1). According to the proposal, it is configured as a surface light source that has an infrared LED for detecting dust / scratch information and a light source for reading image information, and can read an image from which dust / scratch information has been removed. It has become.

  The form according to the proposal will be briefly described with reference to FIG. FIG. 2 shows an example of an image reading apparatus that can read a document original or the like and a photographic film.

  The image reading device 1 is provided with a transparent document illumination device 2 necessary for reading the photographic film 20, and a transparent document light source lighting inverter 4 and an I / F cable so as to be controlled from the image reading device control board 3. 5 is electrically connected. This figure shows that a transparent original light source 6 for irradiating a read transparent original with visible light and infrared light is provided. The first reflection mirror 8, the second reflection mirror 9, the third reflection mirror 10, the fourth reflection mirror 11, and the fifth reflection mirror 12 that are necessary for optically imaging the read document and the CCD image sensor 7. An optical unit 15 having a moving member including an illumination light source 14 for reflecting originals for irradiating a document original and the like, an image input device control board 3 and a signal cable 16. An image is read by a motor 17 that is electrically connected to the head while being scanned in the direction of the illustrated scanning direction arrow. Further, the optical path length correction glass 21 for visible light can be removed from the optical path by being tilted or inserted into the optical path by being erected. The CCD image sensor 7 and the image input device control board 3 are electrically connected by a signal cable 18, and the optical unit 15 is moved in the sub scanning direction by the motor 17. The image reading device control board 3 is connected to an external interface 19. The image reading device control board 3 is externally controlled via the external interface 19, and an electrical signal photoelectrically converted by the CCD image sensor 7 is converted into image data. Output to the outside.

In order to detect dust / scratch information of the film original 20, infrared light is irradiated from the light source 6 for transmissive originals, the optical path length correction glass 21 for visible light is raised, and the infrared light is focused on the film original surface. Adjust the optical path length as follows. In this state, the image unit control board 3 is used to control the optical unit 15 to obtain image data obtained by irradiating infrared light and scanning a film document. In general, a film document transmits infrared light and shields infrared light only in a dust / scratch region, so that dust / scratch information can be detected by examining the luminance on the image data.
Japanese Patent Laid-Open No. 2001-298593

  However, in order to detect dust / scratch information in the image reading apparatus described above, it is necessary to switch between a reflective original light source and a transparent original light source, and a commonly used cold cathode ray tube (hereinafter referred to as CCFL) is required. Due to the characteristics, once CCFL is turned off, it takes time until the brightness necessary for image reading is reached, so it takes a long time to output image data.

  Accordingly, an object of the present invention is to make it possible to detect dust / scratch information without turning off the light source for a transparent document.

  In order to solve the above problems, the present invention provides a first light source positioned on a first side with respect to a document, and a second light source positioned on a second side opposite to the first side with respect to the document. Data acquisition for acquiring electronic image data by receiving two light sources, light emitted from the first light source and transmitted through the original, and light emitted from the second light source and reflected from the original And control means for controlling the operations of the first and second light sources and the data acquisition means, and the control means turns on both the first and second light sources. The data acquisition means moves the first light source to a position where it does not receive the light emitted from the first light source.

  According to the present invention, when reading a document using the first light source located on the first side with respect to the document and the second light source located on the second side with respect to the document, respectively. The reading using the second light source can be executed without turning off the first light source.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[Embodiment 1]
FIG. 1 is a configuration example of an image reading apparatus that realizes an image processing method corresponding to the present embodiment.

  The image reading apparatus 100 is provided with a transparent original illumination device 102 necessary for reading the photographic film 120, and the transparent original light source lighting inverter 104 and the I / F cable so as to be controlled from the image reading apparatus control board 103. 105 is electrically connected. The illuminating light source for transmissive document 106 can be moved in the sub-scanning direction by a motor 121. The motor 121 is connected to the image reading device control board 103 by a signal cable 122 and is controlled by the image reading device control board 103.

  The first reflecting mirror 108, the second reflecting mirror 109, the third reflecting mirror 110, the fourth reflecting mirror 111, and the fifth reflecting mirror 112, which are necessary for optically imaging the read document and the CCD image sensor 107. An optical unit 115 having a moving member including a reflection source illumination light source 114 for irradiating a document original and the like, and a lens 113, is a motor electrically connected to the image reading device control board 13 and the signal cable 116. 117 is configured to read an image while scanning in the direction of the illustrated scanning direction arrow.

  At this time, the transmissive original light source 122 is moved by the motor 121 while being synchronized with the optical unit 115, thereby emitting light to the film original 120.

  The CCD image sensor 107 and the image reading device control board 103 are electrically connected by a signal cable 118, and the optical unit 115 is moved in the sub scanning direction by the motor 117. The image reading device control board 103 is connected to an external interface 119. The image reading device control board is controlled from the outside through this interface, and an electric signal photoelectrically converted by the CCD image sensor 107 is output to the outside as image data. Output.

  FIG. 3 is a block diagram illustrating an example of a hardware configuration of an image reading apparatus that implements an image processing method corresponding to the present embodiment. A transmissive original light source unit 301 for irradiating a film original includes a cold cathode fluorescent lamp 302 as a transmissive original light source, and a light guide 303 for irradiating light from the light source perpendicularly to the film original. The cold cathode fluorescent lamp 302 is connected to a cold cathode fluorescent lamp lighting circuit 304, and the cold cathode fluorescent lamp lighting circuit 304 is controlled by the system controller 305.

  The optical unit 306 includes a cold cathode fluorescent lamp 307 that is an illumination light source for a reflective document, and a CCD image sensor 308. The cold cathode fluorescent lamp 307 is connected to a cold cathode fluorescent lamp lighting circuit 309, and the cold cathode fluorescent lamp lighting circuit 309 is controlled by the system controller 305. The CCD image sensor 308 is controlled by the system controller 305, and a signal output from the CCD image sensor 308 passes through the analog processing circuit 310, passes through the A / D conversion circuit 311, passes through the image processing circuit 312, and accumulates in the buffer 313. . The system controller 305, the buffer 313, and the interface 314 are connected by a bus 315 so that mutual data communication is possible. The signal accumulated in the buffer 313 passes through the interface 314 as image data and is sent to the external device 316. The external device 316 includes, for example, a general-purpose personal computer.

  Next, a case where the film original 120 is read using the illumination light source 106 for the transparent original will be described with reference to FIG.

  In this case, the reflective original illumination light source 114 is turned off, and only the transparent original illumination 106 is turned on. At the position of the optical unit 115 shown in FIG. 4, there is the transmissive original illumination 106 above the optical unit 115, so that the light emitted from the transmissive original illumination light source 106 and transmitted through the film original 120 is in the optical unit 115. Each mirror repeatedly reflects and enters the CCD image sensor 107. While maintaining this state, the optical unit 115 and the transparent original illumination 106 are synchronized, and the film original 120 is scanned in the sub-scanning direction to obtain image data.

  FIG. 7 shows an example of the image data acquired when the film original 120 is read using the illumination light source 106 for the transparent original in this way. As shown in FIG. 7, among the light emitted from the illuminating light source 114 for the transmissive original, the light applied to the dust / flaw portion on the surface of the film original 120 is shielded and does not enter the CCD image sensor 107. Only other areas without defects are detected as significant pixel values. Therefore, dust / scratch portions remain in the image data.

  Next, a case where the film original 120 is read using the reflective original illumination light source 114 will be described with reference to FIG.

  In this case, the illuminating light source 106 for the transparent original is also turned on together with the illuminating light source 114 for the reflective original. At the position of the optical unit 115 shown in FIG. 6, since there is no transmissive original illumination 106 above the optical unit 115, the light transmitted through the film original 120 does not enter the optical unit 115, and the CCD image sensor. 107 does not enter. While maintaining this state, the film unit 120 is scanned by moving the optical unit 115 and the illuminating light source 106 for the transmissive document.

  On the other hand, the light irradiated to the film original 120 from the illumination light source 114 for the reflection original is reflected when it enters the dust / flaw position on the surface of the film original 120 and is repeatedly reflected by each mirror in the optical unit 115 to be a CCD image. Since the light enters the sensor 107, image data for detecting dust / scratch information can be obtained.

  FIG. 5 shows an example of image data acquired when the film original 120 is read using the reflection original illumination light source 114 in this way. As shown in FIG. 5, of the light emitted from the illumination light source 114 for the reflective original, the light applied to the dust / flaw portion on the surface of the film original 120 is reflected and incident on the CCD image sensor 107. A significant pixel value is detected only in the scratch portion, and a significant pixel value is not detected in other regions where there is no dust / scratch.

  FIG. 8 is a block diagram illustrating an example of the configuration of a dust / scratch removal unit 800 that performs dust / scratch correction on image data output from the image reading apparatus 100. The dust / scratch removal unit 800 is preferably configured in a personal computer as the external device 316 illustrated in FIG. 3, but may be configured in the image reading apparatus 100.

  Hereinafter, dust / scratch removal processing in this embodiment will be described with reference to the block diagram of FIG. 8 and the flowchart of FIG. FIG. 11 is a flowchart corresponding to an example of processing for removing dust / scratch information from image data, corresponding to the present embodiment.

  First, in step S 1101, image data read from the image reading apparatus 100 using the reflection original illumination light source 114 is stored in the reflection original light source image memory 803 through the interface 801.

  In step S 1102, the image data read from the image reading apparatus 100 using the transparent original illumination light source 106 is stored in the transparent original light source image memory 802 through the interface 801.

  In step S1103, the dust / scratch detection processing unit 804 detects dust / scratch information from the image data stored in the image memory 803, and transmits the detected dust / scratch information to the dust / scratch correction processing unit 805. In step S1104, the dust / scratch correction processing unit 805 corrects the image data stored in the image memory 802 using the received dust / scratch information.

  More specifically, the reflection original light source image memory 803 stores image data as shown in FIG. 5, and this image data records the brightness of reflected light only in the dust / scratch area. . Accordingly, the dust / scratch detection processing unit 804 can detect dust / scratch information based on the recorded luminance information. This detection can be performed, for example, by comparing each pixel value constituting the image data with a predetermined threshold value and detecting a pixel value having a value exceeding the threshold value as a pixel representing dust / flaw. Further, if the positions of the detected pixels in the entire image data are held, the positions of dust and scratches can be easily specified.

  If the dust / scratch correction processing unit 805 uses the detected dust / scratch information, the dust / scratch position and size of the acquired image data including dust / scratch information as shown in FIG. By specifying the image data and interpolating the image data at that location from the image data at other locations, it is possible to generate image data that does not include dust or scratches. Since the interpolation method is a known technique, detailed description thereof is omitted here.

  An example of image data obtained by the above dust / scratch correction processing is as shown in FIG. As shown in FIG. 9, according to the dust / scratch correction process, the dust / scratch in the image data shown in FIG. 7 formed at the position shown in FIG. 5 is removed, and can be acquired as image data free of dust / scratches. .

  The above operation sequence will be described using a flowchart with reference to FIG. This process is executed under the control of the external device 316 and the system controller 305.

  In step 1001, both the transparent original illumination light source 106 and the reflective original illumination light source 114 are turned on. In some types of cold cathode fluorescent lamps, it takes some time until sufficient luminance is obtained. Therefore, this step waits until sufficient luminance is obtained.

  In step S1002, the transparent original illumination light source 106 is moved to a position where the light emitted from the transparent original illumination light source 106 does not enter the optical unit 115, and the optical unit is further moved to the reading front end position where the film original 120 to be read is placed. 115 is moved in synchronism with the illumination light source 106 for the transparent original. In step S <b> 1003, image information of the film original 120 is read using the reflection original illumination light source 114. In step S1004, the optical unit 115 is moved to a predetermined standby position.

  In step S1005, the reflection original illumination light source 114 is turned off. In step S <b> 1006, the transparent original illumination light source 106 is moved to a position where the light emitted from the transparent original illumination light source 106 enters the optical unit 115. In step S1007, the transparent original illumination light source 106 is moved in synchronization with the reading front end position where the film original 120 for reading the optical unit 115 is placed. In step S1008, an image is read using the illumination light source 106 for a transparent document.

In step S <b> 1009, the optical unit 115 and the transparent original illumination light source 106 are moved to predetermined standby positions. In step S1010, processing for detecting dust / scratch information based on the image data read by the dust / scratch detection processing unit 804 is performed.
In step S1011, the dust / scratch correction processing unit 805 corrects the image data based on the dust / scratch information obtained in step S1010.

  In the above sequence, the reflective original illumination light source 114 is used first, and then the transparent original illumination light source 106 is used. However, this order is not important, and the transparent original illumination light source 106 is used first. Ordinary film original image reading may be executed, and then the film original is irradiated using the reflection original illumination light source 114 to read dust / scratch information of the film original.

  As described above, according to the image reading apparatus corresponding to the present embodiment, the transparent document illumination light source 106 is moved to a position where the light emitted from the transparent document illumination light source 106 does not enter the CCD sensor 107. Thus, since the dust / scratch information is read using the reflective document illumination light source 114, it is not necessary to turn off the transmissive document illumination light source 106 during the dust / scratch information reading.

  Therefore, even when trying to read the image information of the film original 120 using the illuminating light source 106 for the transparent original, it is not necessary to wait until the light source reaches a necessary luminance level, and the reading process can be immediately executed. . Therefore, it is possible to output film image data from which dust / scratch information is removed in a short time.

[Embodiment 2]
The configuration of the image reading apparatus 100 in the present embodiment is as shown in FIG. 12, and is basically the same as the image reading apparatus 100 corresponding to the first embodiment shown in FIG. Also, the hardware configuration of the image reading apparatus corresponding to the present embodiment is almost the same as the configuration shown in FIG.

  However, the configuration of the illuminating light source 106 for the transparent document is different between the first embodiment and the second embodiment. In the first embodiment, the motor 121 moves in the sub-scanning direction. However, in this embodiment, the transmissive document illumination light source 106 does not move in the sub-scanning direction, and the entire film document 120 is collectively moved. Arranged to illuminate.

  FIG. 13 is a diagram illustrating an example of the transparent document illumination device 102 in FIG. 12 as viewed from above the image reading device 100. Here, the transparent document illumination light source 106 is connected to the transparent document light source lighting inverter 104, and a light shielding plate 1301 for shielding the transparent document illumination light source 106 can be moved by driving a motor 1302. The motor 1302 is connected to the image reading apparatus control board 103 by wiring 1303, and its operation is controlled.

  That is, the motor 1302 rotates clockwise or counterclockwise as shown in FIG. 12 under the control of the image reading apparatus control board 103, and the light shielding plate 1301 is interposed between the illuminating light source 106 for the transmissive document and the film document 130. Operates to insert and withdraw.

  For example, when the film original 120 is read by using the transparent original illumination light source 106, the positional relationship between the transparent original illumination light source 106 and the light shielding plate 1301 is as shown in FIG.

  Here, the light-shielding plate 1301 has moved to a position where it does not shield the transparent original illumination light source 106, and the transparent original illumination light source 106 is lit. At the position of the light shielding plate 1301 as shown in FIG. 14, the light from the illuminating light source 106 for the transmissive document is not shielded, so that the light transmitted through the film document 120 passes through the optical unit 115 and enters the CCD image sensor 107. To do. Image data can be obtained by scanning the film original 120 using the optical unit 115 while maintaining this state. The image data acquired at this time is, for example, as shown in FIG.

  On the other hand, in the case where dust / scratch information on the film original 120 is read using the reflective original illumination light source 114 while blocking the light irradiated from the transparent original illumination light source 106 to the film original 120, the transparent original illumination is used. The positional relationship between the light source 106 and the light shielding plate 1301 is as shown in FIG.

  In this case, the light shielding plate 1301 has been moved to a position where the light source 106 for the transparent original is shielded, and the light source 106 for the transparent original is lit. At the position of the light shielding plate 1301 shown in FIG. 15, the light from the transmissive original illumination light source 106 is shielded, so that the light emitted from the transmissive original illumination light source 106 does not enter the film original 120 and the CCD image sensor. 107 does not enter. While maintaining the positional relationship between the light shielding plate 1301 and the illuminating light source 106 for the transparent original, the film original 120 is irradiated using the reflective original illumination light source 114 and the film original 120 is scanned using the optical unit 115. Thus, image data for detecting dust / scratch information formed on the film original 120 can be obtained. The image data acquired at this time is, for example, as shown in FIG.

  Thus, also in the present embodiment, the brightness of the reflected light is recorded only in the dust / scratch area in the image data corresponding to FIG. Dust / scratch information is detected based on the recorded information. For the image data corresponding to FIG. 7, the position / size of the dust / scratch can be specified from the dust / scratch information. By interpolating the image data at that location from the image data at another location, the dust / scratch can be detected. For example, image data as shown in FIG. 9 that is not included can be obtained.

  The above operation sequence will be described using a flowchart with reference to FIG. This process is executed under the control of the external device 316 and the system controller 305. In step S1601, both the transparent original illumination light source 106 and the reflective original illumination light source 114 are turned on. In some types of cold cathode fluorescent lamps, it takes some time until sufficient luminance is obtained. Therefore, this step waits until sufficient luminance is obtained.

  In step S <b> 1602, the shielding plate 1301 is moved to a position where the light emitted from the illuminating light source 106 for the transmissive document is shielded from entering the optical unit 115. In step S1603, the optical unit 115 is moved to the reading tip position where the film original 120 to be read is placed. In step S1604, image information of the film original 120 is read using the reflection original illumination light source 114. In step S1605, the optical unit 115 is moved to a predetermined standby position.

  In step S1606, the reflection original illumination light source 114 is turned off. In step S <b> 1607, the shielding plate 1301 is moved to a position where the light emitted from the illuminating light source 106 for the transmissive document enters the optical unit 115. In step S1608, the optical unit 115 is moved to the reading front end position where the film original 120 is placed. In step S1609, the image information of the film original 120 is read using the illuminating light source 106 for the transparent original. In step S1610, the optical unit 115 is moved to a predetermined standby position.

  In step S <b> 1611, processing is performed to detect dust / scratch information based on the image data read by the dust / scratch detection processing unit 804. In step S1612, the dust / scratch correction processing unit 805 corrects the image data based on the dust / scratch information obtained in step S1609.

  In this sequence, the reflective original illumination light source 114 is used first, and then the transparent original illumination light source 106 is used. However, this order is not important, and the transparent original illumination light source 106 is used first. Ordinary image reading of a film document may be performed, and then the film document may be irradiated using the illumination light source 114 for the reflected document to read dust / scratch information on the film document.

  As described above, according to the image reading apparatus corresponding to the present embodiment, the light emitted from the illuminating light source 106 for the transmissive document is shielded by the shielding plate 1301 and prevented from entering the CCD sensor 107 and then reflected. Since the dust / scratch information is read using the document illumination light source 114, it is not necessary to turn off the transparent document illumination light source 106 during the dust / scratch information reading.

  Therefore, even when trying to read the image information of the film original 120 using the illuminating light source 106 for the transparent original, it is not necessary to wait until the light source reaches a necessary luminance level, and the reading process can be immediately executed. . Therefore, it is possible to output film image data from which dust / scratch information is removed in a short time.

[Other Embodiments]
An object of the present invention is to provide a storage medium or recording medium in which a program code of software that realizes the functions of the above-described actual form is recorded, attached to the system or apparatus, and a computer (processing arithmetic device of the system or apparatus). Can also be achieved by reading and executing the program code of the software recorded on the storage medium or the recording medium. In this case, the storage medium or the software program code read from the storage medium realizes the functions of the above-described embodiments. And the storage medium in which the program code of the software was recorded, or the recording medium constitutes the present invention.

  In addition, by executing the program code of the software read by the computer of the system or apparatus, not only the functions of the above-described embodiments are realized, but also the computer is operated on the computer based on the contents of the program code of the software. A certain operation system takes part or all of the actual processing, and the functions of the above-described embodiments are realized by the processing.

  After the program code of the software read from the storage medium or the recording medium is transferred to the storage medium or the recording medium provided in the hardware for extending the function associated with the computer of the system or apparatus, the software Based on the contents of the program code, the processing arithmetic unit provided in the hardware for expanding the functions associated with the system or the computer of the apparatus is responsible for part or all of the actual processing, and the processing is described above. The function of the embodiment is realized.

It is a figure which shows an example of a structure of the image reading apparatus corresponding to Embodiment 1 of this invention. It is a figure which shows an example of a structure of the conventional image reading apparatus. FIG. 2 is a diagram illustrating an example of a hardware configuration of an image reading apparatus 100 corresponding to an embodiment of the present invention. FIG. 6 is a diagram for explaining reading of a film document 120 when a transparent document illumination light source 106 is used, corresponding to Embodiment 1 of the present invention. It is a figure which shows an example of the image data obtained when the film original 120 corresponding to Embodiment 1 of this invention is read with the illumination light source 114 for reflective originals. It is a figure for demonstrating the reading of the film original 120 at the time of using the illumination light source 114 for reflective originals corresponding to embodiment of this invention. It is a figure which shows an example of the image data obtained when the film original 120 is read by the illumination light source 114 for reflective originals corresponding to embodiment of this invention. It is a figure which shows an example of a structure of the dust and the flaw removal part 800 corresponding to embodiment of this invention. FIG. 6 is a diagram illustrating an example of image data obtained by removing dust and scratches from image data when a film original 120 is read by the transparent original illumination light source 106, according to the embodiment of the present invention. 6 is a flowchart corresponding to an example of processing in the image reading apparatus 100, corresponding to Embodiment 1 of the present invention. It is a flowchart corresponding to an example of a dust and a flaw removal process corresponding to the embodiment of the present invention. It is a figure which shows an example of a structure of the image reading apparatus corresponding to Embodiment 2 of this invention. It is the schematic for demonstrating the illuminating device 102 for transparent originals for light-shielding the illumination light source 106 for transparent originals corresponding to Embodiment 2 of this invention. FIG. 10 is a diagram for explaining a positional relationship between a transparent original illumination light source and a light shielding plate when a film original is read using the transparent original illumination light source according to the second embodiment of the present invention. . FIG. 10 is a diagram for explaining the positional relationship between a transparent original illumination light source and a light shielding plate when a film original is read using a reflective original illumination light source corresponding to the second embodiment of the present invention. . 10 is a flowchart corresponding to an example of processing in the image reading apparatus 100, corresponding to Embodiment 2 of the present invention.

Claims (19)

A first light source located on a first side with respect to the document;
A second light source located on a second side opposite to the first side with respect to the original;
A data acquisition unit that receives light emitted from the first light source and transmitted through the document and light reflected from the document and emitted from the second light source, and acquires electronic image data;
Control means for controlling the operation of the first and second light sources and the data acquisition means,
The control means moves the first light source to a position where the data acquisition means does not receive light emitted from the first light source when both the first and second light sources are turned on. An image reading device characterized in that   When the data acquisition unit receives the light emitted from the first light source and transmitted through the document and acquires the electronic image data, the control unit turns on only the first light source. The image reading apparatus according to claim 1. A first light source located on a first side with respect to the document;
A second light source located on a second side opposite to the first side with respect to the original;
A data acquisition unit that receives light emitted from the first light source and transmitted through the document and light reflected from the document and emitted from the second light source, and acquires electronic image data;
Shielding means for shielding light emitted from the first light source;
Control means for controlling the operations of the first and second light sources, the data acquisition means, and the shielding means,
When the control unit is lighting both the first and second light sources, the control unit prevents the data acquisition unit from receiving the light emitted from the first light source. An image reading apparatus that blocks light from the light source.   When the data acquisition unit receives the light emitted from the first light source and transmitted through the document and acquires the electronic image data, the control unit turns on only the first light source. The image reading apparatus according to claim 3. Detection means for detecting non-image information formed on the original from image data acquired by the data acquisition means based on light reflected from the original;
The correction means for correcting the image data acquired by the data acquisition means based on the light transmitted through the document based on the non-image information detected by the detection means. 5. The image reading apparatus according to 2 or 4.   The image reading apparatus according to claim 5, wherein the non-image information is information related to a position and a size of dust or scratches attached to the document.   The detection means is based on a difference between image data acquired by the data acquisition means based on light reflected from the original and image data acquired by the data acquisition means based on light transmitted through the original. The image reading apparatus according to claim 5, wherein non-image information formed on the original is detected. An image reading apparatus according to claim 2 or 4,
From the image data acquired by the data acquisition means based on the light reflected by the original, a detection means for detecting non-image information formed on the original, and the non-image information detected by the detection means An image processing system comprising: an image processing apparatus including: a correction unit that corrects image data acquired by the data acquisition unit based on light transmitted through the document.   The image processing system according to claim 8, wherein the non-image information is information related to a position and a size of dust or scratches attached to the document.   The detection means is based on a difference between image data acquired by the data acquisition means based on light reflected from the original and image data acquired by the data acquisition means based on light transmitted through the original. The image processing system according to claim 8, wherein non-image information formed on the document is detected. From the first light source located on the first side with respect to the document, the second light source located on the second side opposite to the first side with respect to the document, and the first light source A method for controlling an image reading apparatus, comprising: data acquisition means for receiving light that has been irradiated and transmitted through the document, and light that has been irradiated from the second light source and reflected by the document, and that acquires electronic image data. There,
Turning on the first light source;
Turning on the second light source;
A step of moving the first light source to a position where the data acquisition means does not receive the light emitted from the first light source when both the first and second light sources are turned on;
And a first acquisition step of acquiring electronic image data by receiving the light emitted from the second light source and reflected by the document by the data acquisition means. . Turning off the second light source;
A second acquisition step of acquiring electronic image data by receiving light emitted from the first light source and transmitted through the document after the second light source is turned off by the data acquisition unit; The method of controlling an image reading apparatus according to claim 11. From the first light source located on the first side with respect to the document, the second light source located on the second side opposite to the first side with respect to the document, and the first light source A method for controlling an image reading apparatus, comprising: a data acquisition unit that receives light transmitted through the document and light emitted from the second light source and reflected by the document, and acquires electronic image data. ,
Turning on the first light source;
Turning on the second light source;
A shielding step of shielding light emitted from the first light source when both the first and second light sources are turned on;
In a state where the light emitted from the first light source is shielded, the data obtaining means receives the light emitted from the second light source and reflected by the document, and obtains electronic image data. An image reading apparatus control method comprising: an acquisition step. Turning off the second light source;
A second acquisition step of acquiring electronic image data by receiving light emitted from the first light source and transmitted through the document after the second light source is turned off by the data acquisition unit; The method of controlling an image reading apparatus according to claim 13. A detection step of detecting non-image information formed on the document from the image data acquired by the data acquisition unit based on the light reflected from the document;
And a correction step of correcting the image data acquired by the data acquisition unit based on the light transmitted through the document based on the non-image information detected in the detection step. 15. A method for controlling an image reading apparatus according to 12 or 14.   16. The method of controlling an image reading apparatus according to claim 15, wherein the non-image information is information related to the position and size of dust or scratches attached to the document.   In the detection step, based on a difference between the image data acquired by the data acquisition unit based on the light reflected from the document and the image data acquired by the data acquisition unit based on the light transmitted through the document. The method according to claim 15 or 16, wherein non-image information formed on the original is detected.   An image reading apparatus control program for causing a computer to execute the image reading apparatus control method according to any one of claims 11 to 17.   A computer-readable recording medium storing the control program for the image reading apparatus according to claim 18.

Images