JP2010245717A - Image reader and image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simply and correctly acquire a photograph area in an original. <P>SOLUTION: A scanner respectively scans the original, when an infrared cut filter is located outside the optical path of reflected light from the original and when the infrared cut filter is located on the optical path. Then, a photograph area determining part compares two pieces of image data, determines an area having different images as a photograph area and determines an area where the images coincide as an area (character area) other than photographs. After that, a photograph-area extracting part extracts the image of the photograph area from the image shown by image data outputted, when the infrared cut filter is located outside the optical path of the reflected light from the original, and a resolution converting part changes resolution of images of the photograph area and the character area. Moreover, a data-compressing part compresses the images of the photograph area and the character area by compression methods that are respectively optimal for the images. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an image reading apparatus and an image forming apparatus capable of reading a document image and specifying a photographic region included in the document image.

  In recent years, there are increasing opportunities for a scanner to read a document image and to store the document image as an electronic file. In addition, data compression is often performed when an electronic file is stored. When a document with a photo is read by a scanner, it is preferable to use a compression method suitable for characters in the character region and a compression method suitable for the photo in the photo region in order to maintain the compressed image quality. However, in practice, when a user scans a document with a photo, the user must specify the range of the photo area from the operation unit and operate the photo area and the text area so that the compression method differs. There has been an inconvenience in that the area and the character area are separated and read by the scanner separately to make the compression method different.

  Therefore, various methods for extracting a photographic region included in a document have been proposed. Japanese Patent Application Laid-Open No. 2004-228561 describes a method for accurately acquiring a photograph position by irradiating a photograph attached to a sheet with infrared rays.

JP 2005-198200 A JP 2007-48040 A

  However, in the case of the method described in Patent Document 2, special devices such as an infrared illuminating lamp and an infrared camera are required. Therefore, it is not realistic to attach these devices to a general scanner.

  SUMMARY An advantage of some aspects of the invention is that it provides an image reading apparatus and an image forming apparatus capable of easily and accurately acquiring a photographic region in a document.

  An image reading apparatus according to a first aspect of the present invention includes an illuminating unit that irradiates a document with light, an optical filter that blocks infrared rays contained in reflected light from the document, and a position of the optical filter that reflects the position of the reflected light. Switching means for switching between on and off the optical path, and when the optical filter is outside the optical path of the reflected light, the reflected light that has not passed through the optical filter is received and the first image data is output, When the optical filter is on the optical path of the reflected light, a photoelectric conversion element that receives the reflected light that has passed through the optical filter and outputs second image data; an image indicated by the first image data; The image indicated by the two image data is compared, a region where the images are different is determined as a photographic region, a region where the images match is determined to be a region other than a photo, and the photographic region is determined by the determination unit. Comprising extracting means for extracting an image of the determined area from the image represented by the first image data.

  According to the wavelength characteristics of reflected light reflected from each of a white image, a gray image, a black image, and a photograph (monochrome or color) on the document, the intensities at wavelengths of 400 nm to 700 nm are substantially constant. However, for the reflected light from the white image, gray image and black image, the intensity is almost the same as that in the visible region at each wavelength of 700 nm or more in the infrared region, whereas the reflected light from the photograph is The intensity increases for each wavelength of 700 nm or more. From this, it was found that the reflected light from the photograph of the document contained a lot of light in the infrared region.

  Using this characteristic, the first image data output from the photoelectric conversion element when the infrared light is not cut from the reflected light of the document and the first image data output from the photoelectric conversion element when the infrared light is cut from the reflected light. By comparing the two image data and the determination means detects the difference in the data, it is possible to easily specify the photographic region. As a result, the user does not have to manually input the photo area on the document, and the scanner or copy operation time can be shortened.

  A second aspect of the present invention is the image reading apparatus according to the first aspect, wherein the input of the resolution of the region determined by the determination unit as a photo region and the resolution of the region determined as a region other than the photo is received. Receiving means; and conversion means for converting the resolution of the image of the photographic area extracted by the extracting means and the image of the area other than the photograph according to the resolution received by the receiving means.

  According to this configuration, the user can acquire image data having a desired resolution, and the convenience as an image reading apparatus can be improved.

  The invention according to claim 3 is the image reading apparatus according to claim 1, wherein the resolution of the image in the area determined by the determination unit as the photograph area and the area determined as the area other than the photograph is set respectively. Conversion means for converting to an optimum resolution is further provided.

  According to this configuration, the user can easily acquire image data having an appropriate resolution, and the convenience as an image reading apparatus can be improved.

  Invention of Claim 4 is an image reading apparatus as described in any one of Claims 1-3, Comprising: The display control means which performs display control of a display part is further provided, The said display control means is the said The image of the area determined by the determining means as the photographic area is displayed on the display unit.

  According to this configuration, the user can see the photographic image displayed on the display unit and confirm whether or not the determination unit has correctly recognized the photograph included in the document. Can be increased.

  An image forming apparatus according to a fifth aspect includes the image reading apparatus according to any one of the first to fourth aspects, and an image forming unit that forms an image corresponding to the first image data. .

  According to this structure, there exists an effect similar to Claims 1-4.

  According to the present invention, a photographic area can be easily specified from a document image. Further, the user does not have to manually input the photo area on the document, and the operation time of the scanner or the copy can be shortened.

FIG. 2 is a longitudinal sectional view schematically showing the internal configuration of the multifunction machine. The graph which showed the wavelength characteristic of the reflected light from the original which a light source irradiated the original. (A) is a figure when an infrared cut filter is located on the optical path of reflected light, (b) is a figure when an infrared cut filter is located outside the optical path. FIG. 2 is a functional block diagram illustrating an electrical configuration of a multifunction machine. 6 is a flowchart showing a flow of processing for determining a photo area of a document. An example of the screen displayed on a display part. The figure shows the cut-out process of the photographic image by the photographic area extraction unit.

  Embodiments of an image reading apparatus and an image forming apparatus according to the present invention will be described below with reference to the drawings. In the following embodiment, an example in which the image reading apparatus and the image forming apparatus according to the embodiment of the present invention are integrated into a multifunction machine having functions such as a color copy, a scanner, a facsimile, and a printer will be described. FIG. 1 is a vertical cross-sectional view schematically showing an internal configuration of a multifunction machine 1 as an embodiment of an image reading apparatus and an image forming apparatus according to the present invention.

  The multifunction machine 1 is roughly composed of a document reading mechanism 2 and an apparatus body 3. The document reading mechanism 2 includes a document transport unit 21, a scanner unit 22, an input operation unit 5, and a reversing mechanism described later. The document transport unit 21 includes an ADF (Automatic Document Feeder), and includes a document tray 211, a pickup roller 212, a transport path 213, a paper discharge roller 214, and a paper discharge tray 215. A document to be read is placed on the document tray 211. The originals placed on the original tray 211 are taken one by one by the pickup roller 212 and sequentially conveyed to the conveyance path 213 through the gap. Documents that have passed through the conveyance path 213 are sequentially discharged to a discharge tray 215 by a discharge roller 214.

  The scanner unit 22 optically reads an image of a document and generates image data. The scanner unit 22 includes a platen glass 221, a light source 222, a first mirror 223, a second mirror 224, a third mirror 225, a first carriage 226, a second carriage 227, an imaging lens 228, a CCD (Charge Coupled Device) 229, and An infrared cut filter 290 is provided. In the scanner unit 22, a plurality of LEDs (Light Emitting Diodes) arranged in the main scanning direction are used as the light source 222, and the first mirror 223, the second mirror 224, the third mirror 225, the first carriage 226, and the second carriage. The light from the original is guided to the CCD 229 by the 227 and the imaging lens 228.

  The infrared cut filter 290 is an optical filter that blocks infrared light reflected by the third mirror 225 and transmits light other than infrared light. The infrared cut filter 290 will be described in detail later.

  A document is manually placed on the platen glass 221 by a user's manual operation when the document is not read by the document transport unit 21. The light source 222 and the first mirror 223 are supported by the first carriage 226, and the second mirror 224 and the third mirror 225 are supported by the second carriage 227.

  As a document reading method of the document reading mechanism 2, the scanner unit 22 reads a document placed on the platen glass 221, and the document is captured by the document transport unit 21 (ADF). There is an ADF reading mode.

  In the flat bed reading mode, the light source 222 irradiates a document placed on the platen glass 221, and reflected light for one line in the main scanning direction is reflected in the order of the first mirror 223, the second mirror 224, and the third mirror 225. Then, the light enters the imaging lens 228. The light incident on the imaging lens 228 is imaged on the light receiving surface of the CCD 229. The CCD 229 is a one-dimensional image sensor and simultaneously processes image data of one line of a document extending in the main scanning direction. The first carriage 226 and the second carriage 227 are configured to be movable in a direction orthogonal to the main scanning direction (sub-scanning direction, arrow Y direction). When reading for one line is completed, the first carriage 226 and the second carriage 227 are moved in the sub-scanning direction. The first carriage 226 and the second carriage 227 move, and the next line is read.

  In the ADF reading mode, the document conveying unit 21 takes in the documents placed on the document tray 211 one by one by the pickup roller 212. At this time, the first carriage 226 and the second carriage 227 are arranged at a predetermined reading position P located below the document reading window 230 made of a transparent material such as a glass member. When the document is transported by the document transport unit 21, when the document passes over the document reading window 230 provided in the transport path from the transport path 213 to the paper discharge tray 215, the light source 222 irradiates the document and corresponds to one main scanning line. The reflected light is reflected in the order of the first mirror 233, the second mirror 224, and the third mirror 225, and enters the imaging lens 228. The light incident on the imaging lens 228 is imaged on the light receiving surface of the CCD 229. Subsequently, the document is transported by the document transport unit 21 and the next line is read.

  Further, the document conveying unit 21 has a document reversing mechanism including a switching guide 216, a reversing roller 217, and a reversing conveying path 218. The document reversing mechanism reverses the front and back of the document whose front side (one side of the document) has been read by the first ADF reading and transports the document again to the position of the document reading window 230, so that the back side (the other side of the document is again scanned by the CCD 229. Reading) is performed. This document reversing mechanism operates only when reading both sides, and does not operate when reading one side. After reading the back side during single-sided reading and double-sided reading, the switching guide 216 is switched to the upper side, and the document that has passed through the conveyance path 213 is discharged onto the discharge tray 215 by the discharge roller 214. After the front side reading at the time of double-sided reading, the switching guide 216 is switched to the lower side, and the document that has passed through the conveyance path 213 is conveyed to the reverse conveyance path 218 by the reverse roller 217. Thereafter, the switching guide 216 is switched upward, and the reverse roller 217 rotates in the reverse direction to re-feed the original to the conveyance path 213.

  The multifunction device 1 includes an apparatus main body 3 and a stack tray 6 disposed on the left side of the apparatus main body 3. The apparatus main body 3 includes a plurality of paper feed cassettes 461, a paper feed roller 462 that feeds recording paper from the paper feed cassette 461 one by one and transports it to the image forming unit 40, and a recording paper transported from the paper feed cassette 461. And an image forming unit 40 for forming an image. The apparatus body 3 also includes a paper feed tray 471 and a feed roller 472 that feeds the originals placed on the paper feed tray 471 one by one toward the image forming unit 40.

  The image forming unit 40 includes a charge eliminating device 421 that removes residual charges from the surface of the photosensitive drum 43, a charging device 422 that charges the surface of the photosensitive drum 43 after charge removal, and image data acquired by the scanner unit 22. An exposure device 423 that outputs a laser beam to expose the surface of the photosensitive drum 43 to form an electrostatic latent image on the surface of the photosensitive drum 43, and on the photosensitive drum 43 based on the electrostatic latent image. Furthermore, developing devices 44K, 44Y, 44M, and 44C that form toner images of each color of cyan (C), magenta (M), yellow (Y), and black (K), and each color formed on the photosensitive drum 43, respectively. A transfer drum 49 on which the toner image is transferred and superimposed, a transfer device 41 for transferring the toner image on the transfer drum 49 to a sheet, and a sheet on which the toner image has been transferred are heated to form a toner image. And a fixing device 45 for fixing on the paper. Note that toner is supplied to each of the colors cyan, magenta, yellow, and black from a toner supply container (toner cartridge) (not shown). Further, conveyance rollers 463 and 464 that convey the recording paper that has passed through the image forming unit 40 to the stack tray 6 or the discharge tray 48 are provided.

  When forming images on both sides of the recording paper, the image forming unit 40 forms an image on one side of the recording paper, and then the recording paper is nipped by the conveyance roller 463 on the discharge tray 48 side. In this state, the conveyance roller 463 is reversed to switch back the recording paper, and the recording paper is sent to the paper conveyance path L and conveyed again to the upstream area of the image forming unit 40, and an image is formed on the other surface by the image forming unit 40. After the formation, the recording paper is discharged to the stack tray 6 or the discharge tray 48.

  Further, in front of the apparatus main body 3, there are various displays such as a display unit 51 through which a user can visually recognize an operation screen and various messages, a numeric keypad 53 for inputting the number of printed sheets, a start button 55 for instructing start of reading a document, and the like. An input operation unit 5 having operation buttons for inputting the operation command is provided. The display unit 51 is configured by an LCD (Liquid Crystal Display), an ELD (Electronic Luminescent Display), or the like, and displays an operation guidance screen for the user such as paper size selection, magnification selection, density selection, and the like. The display unit 51 has a touch panel function. The touch panel detects the touch position when the user performs a touch operation, and outputs a detection signal indicating the touch position to a control unit described later.

  FIG. 2 is a graph showing the wavelength characteristics of the light reflected from the original when the light source 222 irradiates the original. The horizontal axis of the graph is the wavelength [nm], the vertical axis is the CCD output value, the graph G1 is a white image, the graph G2 is a gray image, the graph G3 is a black image, and the graph G4 is a photo (black and white photo or color photo). The CCD output values when light is irradiated on the prepared document are respectively shown. In all the graphs, the intensity at each wavelength of 400 nm to 700 nm is substantially constant. However, at each wavelength of 700 nm or more in the infrared region, the intensities of the graphs G1 to G3 are almost the same as those in the visible region, whereas only the intensities of the graph G4 are increased. From this, it can be seen that the reflected light from the photograph of the document contains a lot of light in the infrared region.

  The present invention proposes a method for determining a photographic area using this characteristic. First, the CCD 229 receives light from which infrared rays have been cut and light that has not been cut as reflected light from the document. Then, the image indicated by the image data output when the infrared light is cut from the reflected light is compared with the image indicated by the image data output when the infrared light is not cut. The image indicated by the image data when the infrared ray is cut and the image indicated by the image data when the infrared ray is not cut should have a large difference in the data in the photographic area. Using this data difference, the photograph area is determined.

  Hereinafter, a method for determining a photographic area will be described in detail. FIG. 3 is a front view of the infrared cut filter 290. The position of the infrared cut filter 290 is moved on or off the optical path of the reflected light reflected by the third mirror 225 when the solenoid 300 operates. 3A is a diagram when the infrared cut filter 290 is located on the optical path of the reflected light, and FIG. 3B is a diagram when the infrared cut filter 290 is located outside the optical path. It is.

  The solenoid 300 is driven in response to a control signal output from a control unit described later, and the plunger 310 connected to the solenoid 300 projects in the direction of arrow A. The frame 291 of the infrared cut filter 290 is pivotally supported in the direction of arrow A with the shaft 292 as a fulcrum, and one end of the plunger 310 is fixed to one point on the frame 291. As shown in FIG. 3A, when the plunger 310 protrudes from the solenoid 300, the infrared cut filter 290 is located on the optical path of the reflected light. That is, the infrared cut filter 290 is at a position that completely covers the light receiving surface of the condenser lens 228.

  On the contrary, as shown in FIG. 3B, when the plunger 310 is drawn into the solenoid 300, the infrared cut filter 290 is positioned out of the optical path of the reflected light. That is, the condenser lens 228 directly receives the light reflected by the third mirror 225. In this embodiment, the solenoid is described as an example of the switching means of the infrared cut filter 290. However, in addition to this, a clutch, a rotary actuator, or the like may be used, and the position of the infrared cut filter 290 is mechanically moved. Anything can be used.

  FIG. 4 is a functional block diagram showing an electrical configuration of the multifunction machine 1. The image forming apparatus 1 includes a control unit 100, a storage unit 110, a scanner unit 22, an image memory 120, an image processing unit 130, a solenoid 300, an image forming unit 40, an input operation unit 5, and a network I / F unit 140. Has been. The same components as those described in FIGS. 1 and 3 are denoted by the same reference numerals, and description thereof is omitted.

  The control unit 100 is configured by a CPU (Central Processing Unit) or the like, reads a program stored in the storage unit 110 in accordance with an input instruction signal or the like, executes a process, and sends the processing to each functional unit. The multifunction device 1 is comprehensively controlled by outputting an instruction signal, transferring data, and the like. The control unit 100 includes a solenoid control unit 101, a photographic region determination unit 102, a photographic region extraction unit 103, a resolution conversion unit 104, and a data compression unit 105.

  When the input operation unit 5 receives a photo / character region determination instruction from the user, the solenoid control unit 101 causes the infrared cut filter 290 to be on the optical path of the reflected light from the document or in accordance with the document reading operation of the scanner unit 22. An instruction signal is output to the solenoid 300 so as to be switched outside the optical path.

  The photographic area determination unit 102 outputs the first image data output when the CCD 229 receives light that does not cut infrared light from reflected light and the first image data that is output when light received when infrared light is cut from reflected light. The two image data are compared to detect a data difference. Then, an area with different data is determined as a photograph area, and an area where the data is almost the same is determined as an area other than a photograph (for example, a character area). After the determination, the photographic area determination unit 102 acquires the position and range of the photographic area in the entire document.

  The photograph area extraction unit 103 cuts out and extracts a photograph area image from the image indicated by the first image data. The resolution conversion unit 104 changes the resolution of the image in the photographic area and the image that is not in the photographic area. The resolution conversion unit 104 may convert the resolution of the image in the photo area and the resolution of the image that is not the photo area into an arbitrary resolution input by the user via the input operation unit 5. The resolution suitable for the image and the image other than the photo area may be automatically converted to a resolution suitable for the character image, assuming that the image is a character image.

  The data compression unit 105 compresses the image of the photographic region extracted by the photographic region extraction unit 103 and the image (character region image) remaining after the extraction of the photographic region image by a compression method appropriate for each. . For example, JPEG compression is performed on the photograph area, and MMR compression is performed on the character area. Thus, by distinguishing the compression method in the photo area and the character area, it is possible to increase the compression rate while preventing image quality deterioration. Note that the user may select an arbitrary compression method via the input operation unit 5 for the compression method of the photo area and the character area.

  The storage unit 110 stores programs, data, and the like for realizing various functions provided in the multifunction machine 1. The image memory 120 temporarily stores image data output from the scanner unit 22 and image data transmitted from an external device via the network I / F unit 140. The image processing unit 130 performs image processing such as image correction and enlargement / reduction on the image data stored in the image memory 120. The network I / F unit 140 includes a communication module such as a LAN board, and transmits / receives various data to / from an external device via a network (not shown) connected to the network I / F unit 140.

  FIG. 5 is a flowchart showing a flow of processing for determining a photo area on a document. First, when the user places a document on the platen glass 221 and presses the start button 55, the solenoid control unit 101 sends an instruction signal to the solenoid 300 for moving the infrared cut filter 290 out of the optical path of the reflected light. Output (step S11). The solenoid 300 is driven in response to this instruction signal, and the infrared cut filter 290 moves out of the optical path of the reflected light. Thereafter, the light source 222 irradiates the original placed on the platen glass 221, and the entire original is read while the first carriage 226 and the second carriage 227 move in the forward direction (forward direction) (step S12). ). The first image data output from the CCD 229 is temporarily stored in the image memory 120.

  Subsequently, the solenoid control unit 101 outputs an instruction signal for moving the infrared cut filter 290 on the optical path of the reflected light to the solenoid 300 (step S13). In response to this instruction signal, the solenoid 300 is driven, and the infrared cut filter 290 moves on the optical path of the reflected light. Thereafter, the light source 222 irradiates the document placed on the platen glass 221, and the entire document is read again while the first carriage 226 and the second carriage 227 move in the backward direction (return direction) (step). S14). The second image data output from the CCD 229 is temporarily stored in the image memory 120. As described above, the first reading is performed when the first carriage 226 and the second carriage 227 move in the forward direction, and the second reading is performed when the first carriage 226 and the second carriage 227 move in the backward direction. The scanner unit 22 reads a document at a high resolution (or the highest resolution) both in the first time and the second time.

  Next, the photographic area determination unit 102 compares the first and second image data stored in the image memory 120 to detect a data difference. Then, an area with different data is determined as a photo area, and an area where the data is almost identical is determined as a character area (step S15). As described above with reference to FIG. 2, the determination method includes an image indicated by the first image data (an image obtained when infrared light is not cut from reflected light in the first reading) and the second image data. Since the image shown (the image acquired when the infrared ray is cut from the reflected light in the second reading) should have a large difference in the data in the photo area, the photo area determination unit 102 A different area is determined as a photo area, and an area where the data is almost identical is determined as a character area. Furthermore, the photographic area determination unit 102 acquires the position and range of the photographic area in the entire document.

  Then, the control unit 100 displays the image of the photographic area acquired by the photographic area determination unit 102 on the display unit 51 (step S16). FIG. 6 is an example of a screen displayed on the display unit 51 at step S16. The control unit 100, together with the images 91 to 93 of the area determined by the photo area determination unit 102 as a photo area, a message 81 prompting the user to confirm whether the displayed photo is all of the photographs included in the document, “ A “Yes” button 82 and a “No” button 83 are displayed on the display unit 51.

  When the user selects the “Yes” button 82 (step S17; YES), the photograph region extraction unit 103 cuts out and extracts the photograph region image from the first image data image (step S18). FIG. 7 illustrates a cutting process performed by the photograph area extraction unit 103. The image 9 is an image indicated by the first image data. When the photographic region determination unit 102 determines that the regions of the images 91 to 93 are photographic regions, the photographic region extraction unit 103 extracts the images 91 to 93 from the image 9, respectively. The image 94 is an image that remains after the images 91 to 93 are extracted (cut) from the image 9. The image 94 includes a character image and the like.

  Next, the resolution conversion unit 104 changes the resolution of the image of the photographic region extracted by the photographic region extraction unit 103 and the image other than the photographic region (step S19). In steps S12 and S14, the scanner unit 22 reads the document at a high resolution (or the highest resolution). For example, the image in the photographic area is maintained as it is, and the area other than the photographic area is a character image and the resolution is lowered. Change direction. By changing to an appropriate resolution according to the type of image, the compression rate of the compression process performed in the next step can be efficiently increased. Note that the user may arbitrarily set the resolution of the image other than the photo area and the photo area.

  Subsequently, the data compression unit 105 compresses the image of the photographic region extracted by the photographic region extraction unit 103 by a compression method suitable for compression of the photographic image (for example, JPEG compression), and converts the image other than the photographic region into a character image. Is compressed by a compression method suitable for compression (for example, a method of performing MMR compression after binarization processing) (step S20). Thus, the compression rate can be increased efficiently by varying the compression method depending on the type of region.

  Further, in response to a user instruction, the control unit 100 creates a PDF file by superimposing the images compressed by the data compression unit 105 and combining them into one in the PDF file format. The created PDF file is stored in the storage unit 110 or transmitted to the external device by the control unit 100 via the network I / F unit 140. Alternatively, after the resolution conversion unit 104 changes the resolution, the control unit 100 combines the images into one image, and the image forming unit 40 forms the image on a recording sheet.

  On the other hand, when the user selects the “NO” button 83 (step S17; NO), the control unit 100 shifts the process to step S11 in order to read the original again. Alternatively, the user may input a photo area via the input operation unit 5.

  As described above, when the infrared cut filter 290 is arranged so that the position can be switched on or off the optical path of the reflected light from the document, and the photo area determination unit 102 does not cut the infrared of the reflected light By comparing the image data with the image data obtained when the reflected light is cut off, and detecting a difference in the data, the photographic region can be easily specified. As a result, the user does not have to manually input the photo area on the document, and the scanner or copy operation time can be shortened.

DESCRIPTION OF SYMBOLS 1 Multifunctional device 3 Main part 2 Original reading mechanism 22 Scanner part (image reading apparatus)
226 Light source 229 CCD (photoelectric conversion element)
290 Infrared cut filter (optical filter)
300 Solenoid (switching means)
40 Image forming unit (image forming apparatus)
5 Input operation part 51 Display part (display means)
100 Control unit (display control means)
101 Solenoid control unit 102 Photo area determination unit (determination means)
103 Photo area extraction unit (extraction means)
104 Resolution converter (conversion means)
105 Data Compression Unit 110 Storage Unit 120 Image Memory 130 Image Processing Unit 140 Network I / F Unit

Claims (5)

Illumination means for irradiating the document with light;
An optical filter that blocks infrared rays contained in the reflected light from the document;
Switching means for switching the position of the optical filter to either on or off the optical path of the reflected light;
When the optical filter is outside the optical path of the reflected light, the reflected light that has not passed through the optical filter is received and the first image data is output, and when the optical filter is on the optical path of the reflected light A photoelectric conversion element that receives reflected light that has passed through the optical filter and outputs second image data; and
A determination unit that compares the image indicated by the first image data with the image indicated by the second image data, determines a different region of the image as a photographic region, and determines a region where the images match as a region other than a photo. When,
Extracting means for extracting an image of an area determined to be a photographic area by the determining means from an image indicated by the first image data;
An image reading apparatus comprising: Receiving means for receiving input of the resolution of the area determined by the determination means as a photo area and the resolution of the area determined as an area other than the photograph;
Conversion means for converting the resolution of the image of the photographic area extracted by the extraction means and the image of the area other than the photograph according to the resolution received by the reception means;
The image reading apparatus according to claim 1, further comprising:   The image reading apparatus according to claim 1, further comprising conversion means for converting the resolution of an image determined by the determination means as a photograph area and an area determined as an area other than the photograph into a predetermined resolution. It further comprises display control means for performing display control of the display unit,
The image reading apparatus according to claim 1, wherein the display control unit causes the display unit to display an image of an area determined by the determination unit as a photographic area. An image reading apparatus according to any one of claims 1 to 4,
Image forming means for forming an image corresponding to the first image data on a recording paper;
An image forming apparatus.