JP2018129701A - Image reading device, control method thereof, and program - Google Patents

Abstract

A rear image corresponding to an output position and output range of a front image can be output with a simple configuration without impairing productivity, and a desired output result can be obtained. A CPU 103 of an image forming apparatus 101 designates a scan mode setting (S601), and parallelly performs front side reading processing by conveying a document and reading back side and storing the back side in a page buffer for back side 502. Executed (S619 to S627), and the determination result (S610, S614, S614) whether the scan mode setting is a reading setting in which the positional relationship between the leading edge in the document transport direction and the top edge of the document image is the same on both sides of the document. Based on the image size specified as the scan mode setting at the image destination or image end of the back image data read and stored in the back side page buffer 502 based on the back side reading process executed in parallel. An image based on the difference in the conveyance direction from the document size is added (S628 to S644). [Selection] Figure 6B

Description

  The present invention relates to control of an image reading apparatus capable of simultaneously reading both sides of a document.

  2. Description of the Related Art Conventionally, image reading units (automatic double-sided reading devices) that automatically read image information on both sides of a sheet document without user intervention have been used in image reading units and computer input scanners provided in copiers and facsimiles. It is used. In these automatic duplex reading apparatuses, there is an apparatus in which an image sensor is provided on each of the front side and the back side of a document transport path to automatically read both sides of the document with one document transport.

  The document read by such an automatic duplex reading device has a positional relationship between the document reading reference edge and the image reference edge depending on the document orientation (portrait / landscape) and the opening direction of the document (upper / lower / left / right). May differ on the back side. Refer to FIG. 8B and FIG. 9A described later.

  Therefore, in order to read the image of such a double-sided document and obtain a desired output result, a back-side image corresponding to the output position and output range of the front-side image is output. It is necessary to output in consideration of the relationship.

  Japanese Patent Application Laid-Open No. 2004-228688 discloses a technique for simultaneously reading front and back images and performing image conversion processing on both sides in real time in accordance with the relationship between the front and back images to generate image data. Has been proposed. According to Patent Document 1, an output result in a desired mode can be obtained without reducing productivity.

JP 2005-268893 A

  In the above-described automatic duplex reading apparatus, when the actual document size is smaller than the document size specified by the user in the scanning setting, the white plate image is read and added to the rear end side of the front document on the front side, and is insufficient. Make up for the minute. The back side is configured so that image data can be captured only for the actual document size in consideration of productivity and a reading range when the actual document size is larger than the specified document size. Therefore, when the actual document size is smaller than the designated document size, the output image on the back side becomes small.

  Japanese Patent Application Laid-Open No. 2004-228561 performs image conversion processing on both sides while simultaneously reading the front and back sides of an original by an automatic double-sided reading device, and outputs read image data in real time. For this reason, Patent Document 1 includes hardware resources such as a processor that can execute image conversion processing for each of the front and back surfaces in parallel and a document size detection sensor that automatically detects the document size before starting reading. Is required. If the hardware resources as described above are provided, an increase in manufacturing cost cannot be avoided. The technique of Patent Document 1 cannot be applied to a low-cost apparatus that does not include hardware resources as described above.

  The present invention has been made to solve the above problems. An object of the present invention is to provide a mechanism that can output a back image corresponding to the output position and output range of a front image and obtain a desired output result with a simple configuration without impairing productivity. That is.

  The present invention includes a transport unit that transports a document along a document transport path, a first reading unit and a second reading unit on both sides of the document transport path, and reads both sides of the document transported on the transport path. An image reading apparatus capable of storing image data read from the document by the second reading unit, a storage unit used as a page buffer, a designating unit designating the document reading setting, and a transport path Detection means for detecting a document to be conveyed; and reading processing of the first surface of the document by the first reading means based on the reading setting designated by the designation means by conveying the document by the conveying means. Control means for controlling parallel processing for reading the second surface of the document by the second reading means and storing the second surface reading processing stored in a page buffer secured in the storage means in parallel; And the control means is configured to determine whether the reading setting is a reading setting in which the positional relationship between the leading edge of the document in the transport direction and the upper end of the image on the document is the same on both sides of the document. Detected by the detection means and the document size specified as the reading setting at the image destination or end of the image data of the second surface read by the second reading means in parallel processing and stored in the page buffer An image based on a difference amount in the conveyance direction with respect to the original size is added.

  According to the present invention, it is possible to output a back image corresponding to the output position and output range of the front image with a simple configuration without impairing productivity, and a desired output result can be obtained.

Block diagram of the entire image forming apparatus to which the image reading apparatus of this embodiment can be applied. Sectional view illustrating the configuration of the scanner unit Block diagram illustrating a schematic configuration of the scanner I / F Block diagram illustrating a schematic configuration of a scanner image processing unit A diagram illustrating the image data flow for each of the front and back surfaces Flowchart illustrating double-sided reading processing of the present embodiment Flowchart illustrating double-sided reading processing of the present embodiment The figure explaining the effective range of back side input image data The figure explaining the effective range of back side input image data The figure which illustrates the double-sided output image in a present Example The figure which illustrates the double-sided output image in a present Example The figure which illustrates the double-sided output image in a present Example The figure which illustrates the double-sided output image in a present Example The figure which illustrates the double-sided output image in a present Example The figure which illustrates the double-sided output image in a present Example The figure which illustrates the double-sided output image in a present Example The figure which illustrates the double-sided output image in a present Example

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram illustrating a hardware configuration of an entire image forming apparatus 101 to which an image reading apparatus according to an embodiment of the present invention can be applied.

  In FIG. 1, the control unit 102 controls the operation of the entire image forming apparatus 101. In the control unit 102, the CPU 103 reads out a control program stored in the ROM 104 or the HDD 106, and performs various controls such as reading / printing / communication. The RAM 105 is used as a temporary storage area such as a main memory or work area for the CPU 103. An HDD (Hard Disk Drive) 106 stores image data and various programs. Note that another storage device such as an SSD (Solid State Drive) may be provided instead of or in combination with the HDD.

  The control unit 102 further includes various interfaces (I / F) and a system bus 118. The operation unit I / F 107 connects the operation unit 112 and the control unit 102. The operation unit 112 includes a display panel (not shown), keys (buttons), and the like, and plays a role as a reception unit that receives an operation / input / instruction by a user. The printer I / F 108 connects the printer 113 and the control unit 102. Image data to be printed by the printer 113 is transferred from the control unit 102 via the printer I / F 108 and printed on the recording material by the printer 113.

  A scanner I / F 109 connects the scanner 114 and the control unit 102. The scanner 114 reads an image on a document to generate image data, and inputs the image data to the control unit 102 via the scanner I / F 109. The scanner image processing unit 116 is a processing unit that performs image processing corresponding to an image processing mode (color scan, monochrome scan, etc.) on the image data developed in the RAM 105 by the processing of the scanner I / F 109. The scanner I / F 109 and the scanner image processing unit 116 will be described in detail later.

  The encoding / decoding unit 117 is a processing unit that performs image data compression / decompression processing conforming to a predetermined standard such as JPEG or JBIG. The modem I / F 110 connects the modem 115 and the control unit 102. The modem 115 is connected to a public line and executes image data facsimile communication with an external facsimile apparatus (not shown).

A network I / F 111 connects the control unit 102 (image forming apparatus 101) to a wired LAN. The image forming apparatus 101 can transmit and receive image data and various types of information to and from an external apparatus via the network I / F 111. For example, the image forming apparatus 101 can receive print image data from an external device via the network I / F 111 and print it with the printer 113 or send the image data read with the scanner 114 to the external device. It is. The system bus 118 provides a data path between the above structural elements.
As described above, the image forming apparatus 101 according to the present exemplary embodiment includes the front surface image reading unit (CIS 204) and the back surface image reading unit (CIS 221) on both sides of the document conveyance path, and both sides of the document conveyed on the conveyance path. Functions as a double-sided image reading apparatus.

Next, the configuration of the scanner 114 will be described with reference to FIG.
FIG. 2 is a cross-sectional view illustrating the configuration of the scanner 114.
As shown in FIG. 2, the scanner 114 includes a scanner lower part 201 and a scanner upper part 202.

The scanner lower part 201 includes a document table 203 and a contact image sensor (CIS) 204. The document table 203 is composed of a transparent plate such as a glass plate.
The scanner upper part 202 includes a document tray 205, a paper discharge tray 206, and an automatic document feeder (ADF) 207.

  The document tray 205, the paper discharge tray 206, and the ADF 207 of the scanner upper part 202 are integrally configured. A document 208 placed on the document tray 205 is taken into the ADF 207, an image is read, and the document is discharged to the paper discharge tray 206. The scanner 114 can perform single-sided reading and double-sided reading of the document 208 by using the ADF 207. The scanner upper part 202 can be opened and closed with respect to the scanner lower part 201 by an opening / closing mechanism (not shown). By opening and closing the scanner upper portion 202, the scanner 114 can read the image of the document placed on the document table 203 without using the ADF 207.

  The CIS 204 in the lower scanner part 201 functions as an image reading unit on one side of the document 208. In this embodiment, the surface (first surface) read by the CIS 204 is referred to as “surface”. Accordingly, the upper surface of the document 208 placed on the document tray 205 is the front surface. In addition, a surface opposite to the front surface (second surface) is referred to as a “back surface”.

  The CIS 204 includes a pair of LED (Light Emitting Diode) light sources 209 and 210, a photoelectric conversion unit 211, and a lens 212 as an irradiation unit. The light emitted from the LED light sources 209 and 210 is reflected by the surface of the original 208 taken in by the ADF 207 or the surface of the original placed on the original table 203, and the reflected light passes through the lens 212 to the photoelectric conversion unit. Input to 211. The photoelectric conversion unit 211 generates image data by converting the input reflected light into an electrical signal.

  The LED light source 209 has a plurality of LED elements and a light guide arranged along the main scanning direction (depth direction in FIG. 2). Similarly, the LED light source 210 includes a plurality of LED elements and a light guide arranged in the main scanning direction. The LED light sources 209 and 210 irradiate the surface of the document through the light guide with the light emitted from the LED elements.

  The photoelectric conversion unit 211 includes a plurality of photoelectric elements arranged in the main scanning direction. The CIS 204 having such a configuration is provided below the document table 203 so as to be movable in the sub-scanning direction (left-right direction in FIG. 2). When a document is placed on the document table 203, the CIS 204 moves in the sub-scanning direction and reads an image of the document. When the original 208 is captured by the ADF 207, the image of the original conveyed by the ADF 207 is read while the CIS 204 is stopped.

  The ADF 207 in the upper scanner portion 202 functions as a document transport unit. The ADF 207 conveys the originals placed on the original tray 205 to the discharge tray 206 one by one. For this purpose, the ADF 207 includes a pickup roller 213, a separation unit 214, a first registration roller 215, a second registration roller 216, a first conveyance roller 217, a second conveyance roller 218, and a paper discharge roller 219 along the conveyance path. . In addition, the ADF 207 includes a document detection sensor 220 and a CIS 221 for detecting the leading edge and the trailing edge of the conveyed document.

  The CIS 221 of the scanner upper portion 202 functions as an image reading unit on the back surface that is the other surface of the document 208. The CIS 221 includes a pair of LED light sources 222 and 223, a photoelectric conversion unit 224, and a lens 225 as an irradiation unit. Light emitted from the LED light sources 222 and 223 is reflected on the back side of the document captured by the ADF 207, and the reflected light is input to the photoelectric conversion unit 224 via the lens 225.

  The photoelectric conversion unit 224 generates image data by converting the input reflected light into an electrical signal. The LED light source 222 has a plurality of LED elements and a light guide arranged along the main scanning direction. Similarly, the LED light source 223 includes a plurality of LED elements and light guides arranged along the main scanning direction. The LED light sources 222 and 223 irradiate the back surface of the document with light emitted from each LED element through the light guide. The photoelectric conversion unit 224 includes a plurality of photoelectric elements arranged in the main scanning direction.

  The ADF 207 takes in the document 208 placed on the document tray 205 by the pickup roller 213. The separation unit 214 has a separation roller on the upper side in the drawing and a separation pad on the lower side, and separates the originals taken in by the pickup roller 213 one by one. The ADF 207 can continuously take in the originals one by one by the pickup roller 213 and the separation unit 214. The first registration roller 215 corrects the skew of the fetched document. The skew-corrected original is conveyed by the second registration roller 216 and the first conveying roller 217 to the image reading position by the CIS 204 and CIS 221.

  When only the surface of the original 208 is read, the surface image is read by the CIS 204. When reading both the front and back sides of the document 208, the front image is read by the CIS 204 and the back image is read by the CIS 221. The document whose image has been read by the CIS 204 and the CIS 221 is discharged to the discharge tray 206 by the second transport roller 218 and the discharge roller 219.

  In the course of transporting and reading a document using the ADF 207, the document detection sensor 220 detects a document sub-scan by the CPU 103 based on a signal (not shown) output when the document detection sensor 220 detects the leading edge and the trailing edge of the document. The scan length is calculated.

  With the above configuration, the image forming apparatus 101 uses the scanner 114 to read either the image of the document placed on the document table 203 or only the image of the document 208 captured by the ADF 207. Read the original image by the method. Note that when only the image of the original 208 captured by the ADF 207 is read, it is possible to read only the image on the front side of the original 208 or simultaneously read the images on the front / back side (both sides) of the original 208. . As described above, the image forming apparatus 101 according to the present exemplary embodiment includes the image reading apparatus capable of simultaneously reading both the front and back sides of the document. Hereinafter, using such an image reading apparatus, even if there are restrictions on hardware resources such as an image processor and a memory, an image in a desired reading range is considered in consideration of the image orientation relationship between the front surface and the back surface of the document. A configuration that enables output will be described.

FIG. 3 is a block diagram illustrating a schematic configuration of the scanner I / F 109.
As shown in FIG. 3, the scanner I / F 109 has a front surface image data input block 301 used for reading a document front surface image and a back surface image data input block 302 used for reading a document back image. In the image forming apparatus 101 of this embodiment, the image data read by the CIS 204 is input to the front image data input block 301, and the image data read by the CIS 221 is input to the back image data input block 302.

First, the surface image data input block 301 will be described.
The timing control unit 1 (303) generates and outputs a reading device control signal corresponding to the reading speed to the CIS 204. This device control signal is synchronized with a synchronization signal generated in the scanner I / F 109, whereby the reading timing in the main scanning direction and the reading process can be synchronized.

  The LED lighting control unit 1 (304) is a unit that controls lighting of the LED 209 and the LED 210 serving as the light source of the CIS 204. The LED lighting control unit 1 (304) controls the synchronization signal, the clock signal, and the dimming control corresponding to the CIS 204 for the sequential lighting control of the LEDs corresponding to the R, G, and B color elements, the start of lighting, and the turn-off of the lighting. Execute control. This control timing is based on the synchronization signal received from the timing control unit 1 (303) described above, and the lighting of the LED 209 and the LED 210 synchronized with the driving of the CIS 204 is controlled.

  The output signal of CIS 204 is input to AFE1 (305). Note that AFE indicates Analog Front End. The AFE1 (305) process performs gain adjustment and A / D conversion on the output signal of the CIS 204, converts the analog signal output from the CIS 204 into a digital signal, and inputs it to the surface image data input block 301. To do.

  The synchronization control unit 1 (306) sets a predetermined threshold level corresponding to the analog signal of the CIS 204 for the AFE1 (305), and adjusts the output signal level according to the difference in the image reading device. Further, the synchronization control unit 1 (306) generates and outputs a sampling clock for analog signal sampling control and a digital signal to be output to the AFE1 (305), and reads an image read by the predetermined digital signal from the AFE1 (305). Receive data. This data is input to the output data control unit 1 (307) via the synchronization control unit 1 (306).

  The output data control unit 1 (307) receives the image data received from the AFE1 (305) in accordance with the output mode of the surface image data input block 301, and the buffer 308 (buffer A-1, buffer B-1, buffer C-1). To store. The image data stored in the buffer 308 is transferred to the RAM 105.

Next, the back surface image data input block 302 will be described.
The back image data input block 302 has the same configuration as the above-described front image data input block 301. The timing control unit 2 (309) generates and outputs a reading device control signal corresponding to the reading speed to the CIS 221. This device control signal is synchronized with a synchronization signal generated in the scanner I / F 109, whereby the reading timing in the main scanning direction and the reading process can be synchronized.

  The LED lighting control unit 2 (310) is a unit that controls lighting of the LED 222 and the LED 223 serving as the light source of the CIS 221. The LED lighting control unit 2 (310) controls the synchronization signal, the clock signal, and the dimming control corresponding to the CIS 221 for the sequential lighting control of the LEDs corresponding to the R, G, and B color elements, the start of lighting, and the turn-off of the lighting. Execute control. This control timing is based on the synchronization signal received from the above-described timing control unit, and the lighting of the LED 222 and the LED 223 synchronized with the driving of the CIS 221 is controlled.

  The output signal of the CIS 221 is input to the AFE 2 (311). The AFE2 (311) process performs gain adjustment and A / D conversion on the output signal of the CIS221, converts the analog signal output from the CIS221 into a digital signal, and inputs it to the back image data input block 302 To do.

  The synchronization control unit 2 (312) sets a predetermined threshold level corresponding to the analog signal of the CIS 221 for the AFE 2 (311), and adjusts the output signal level depending on the difference in the image reading device. Furthermore, the synchronization control unit 2 (312) generates and outputs a synchronization clock for sampling control of the analog signal and outputting the digital signal to the AFE2 (311), and reads the image from the AFE2 (311) as a predetermined digital signal. Receive data. This data is input to the output data control unit 2 (313) via the synchronization control unit 2 (312).

  The output data control unit 2 (313) receives the image data received from the AFE 2 (311) in accordance with the output mode of the back image data input block 302, and the buffer 314 (buffer A-2, buffer B-2, buffer C-2). To store. The image data stored in the buffer 314 is transferred to the RAM 105.

Next, a schematic configuration of the scanner image processing unit 116 will be described with reference to FIG.
FIG. 4 is a diagram illustrating a schematic configuration of the scanner image processing unit 116.
The scanner image processing unit 116 is a processing unit that performs image processing corresponding to an image processing mode (color scan, monochrome scan, etc.) on the image data developed in the RAM 105 by the processing of the scanner I / F 109. The scanner image processing unit 116 performs processing corresponding to each image processing mode on the data loaded in the scanner image processing buffer 408.

  Here, the image data transferred to the RAM 105 as output data of the front-surface image data input block 301 or the back-surface image data input block 302 of the scanner I / F 109 is sequentially input to the scanner image processing buffer 408 for each predetermined data size. Loaded. Further, it is assumed that the image processing related to the image data on each original surface is executed exclusively on a page basis.

  In FIG. 4, a shading correction block 402 is a processing block that corrects variations in the light amount distribution of the light sources (LEDs 209, 210, 222, and 223) in the main scanning direction, variations in the light receiving elements of the image reading device, and dark output offset. is there.

  The input data processing unit 401 is a processing unit that reconstructs frame sequential data separated into R, G, and B into dot sequential data. One-pixel data is stored in the RAM 105 as frame-sequential data for each of R, G, and B colors. When these data are loaded into the scanner image processing buffer 408, the input data processing unit 401 takes out one pixel data for each color data and reconstructs it as R, G, B data of one pixel. The input data processing unit 401 performs this reconstruction process for each pixel, and converts frame-sequential image data into dot-sequential data.

  The processing block 403 includes an averaging processing unit, an input masking processing unit, and a γ correction processing unit. The averaging processing unit is a processing block that performs sub-sampling (simple thinning) for reducing the reading resolution in the main scanning direction or averaging processing. The input masking processing unit is a processing block that calculates color correction of input R, G, and B data. The γ correction processing unit is a processing block that gives predetermined gradation characteristics to input data.

  The character determination processing block 404 is a processing block that performs black character determination and line drawing outline pixel determination on input image data.

  The processing block 405 includes an MTF correction processing unit, an RGB → (L, Ca, Cb) conversion processing unit, and a background density adjustment processing unit. The MTF correction processing unit is a processing unit that performs filter processing in the main scanning direction for MTF difference correction and moire reduction at the time of zooming when changing the image reading device. This is a block for multiplying and adding each coefficient for a predetermined pixel. The RGB → (L, Ca, Cb) conversion processing unit performs conversion processing of multi-value image data of R, G, and B colors in the filtering (lightness enhancement, saturation enhancement, color determination) performed in the subsequent filter processing block 406. I do. The background density adjustment processing unit automatically performs processing for obtaining binarized data suitable for facsimile communication or the like by automatically recognizing the background density of the document and correcting the background density value to the white side.

  The filter processing block 406 performs the lightness component (L) of the image as processing for performing color determination and filtering on the data obtained by the RGB → (L, Ca, Cb) conversion processing unit of the previous processing block 405. Edge strength processing and saturation (Ca, Cb) enhancement processing. Further, the filter processing block 406 performs coloration determination of the input image and outputs the result. Further, the filter processing block 406 can change the parameter of the enhancement amount based on the character generated in the character determination processing block 404, the determination signal of the line drawing outline portion, and the like. The filtered data is converted from L, Ca, Cb to R, G, B data and output. The filter processing block 406 functions as an edge enhancement filter when processing monochrome image data.

A scaling processing block 407 is a processing block that performs linear interpolation scaling processing in the main scanning and sub-scanning directions.
The above image processing is sequentially performed on the data loaded in the scanner image processing buffer 408 in accordance with the set image processing mode (copy mode, scanner mode, etc.).

  As described above, the scanner 114 uses the front image data input block 301 and the back image data input block 302 of the CIS 204, CIS 221, and scanner I / F 109 to simultaneously control the image data of the front / back surface of the document 102. Can be entered. On the other hand, the scanner image processing unit 116 sequentially processes the image data of the front and back surfaces in units of pages.

FIG. 5 is a diagram showing image data flows on the front surface and the back surface.
As shown in FIG. 5, the image forming apparatus 101 according to the present exemplary embodiment includes input of front and back image data by the front surface image data input block 301 and the back surface image data input block 302, and a front surface image by the scanner image processing unit 116. Perform processing in parallel. That is, for the surface of the original, the scanner image processing unit 116 sequentially performs image processing on the read image data while reading the surface of the original with the CIS 204. After the front-side image processing is completed, the image forming apparatus 101 immediately executes back-side image processing by the scanner image processing unit 116.

  At that time, image data is transferred between the surface image data input block 301 and the scanner image processing unit 116 using a ring buffer (surface ring buffer 501) of a predetermined size secured on the RAM 105, and sequentially. Image processing is performed. Thereby, the input of the surface image data and the image processing of the image data are executed in parallel.

  On the other hand, the back image data input from the back image data input block 302 is temporarily stored in a page buffer (back page buffer 502) secured on the RAM 105. Then, after completion of the front side processing (input / image processing) and the input of the back side image data, image processing is executed on the back side image data stored in the page buffer. The back page buffer 502 is a ring buffer.

Next, processing control when the image forming apparatus 101 according to the present exemplary embodiment performs double-sided reading of a document will be described with reference to FIGS.
FIG. 6A and FIG. 6B are flowcharts illustrating a process (double-sided reading process) when performing double-sided reading of a document in the image forming apparatus of this embodiment. In the description of the figure, each step is represented by “S”. The processing shown in this flowchart is realized by the CPU 103 reading out a program stored in the ROM 104 or the HDD 106 to the RAM 105 as necessary and executing it.

FIGS. 7A and 7B show the back side input image data temporarily stored in the back side page buffer 502 when the image processing control process of FIGS. 6A and 6B is executed and the scanner image processing unit 116 out of the image data. FIG.
8 to 11 are diagrams illustrating an example of an output image that is output when the original duplex reading is performed according to the present exemplary embodiment. FIGS. 8 and 9 show an example of an output image when double-sided scanning is executed by specifying “LGL” as the document size for a document whose actual document size is “LTR”. 10 and 11 show an example of an output image when duplex scanning is executed by designating “LTR” as a document size for a document whose actual document size is “LTR”.

  The examples shown in FIGS. 8 and 9 are examples in which the “specified document size” is larger than the “actual document size”, so an image (additional image) that is not included in the actual document is the final output image. Will be included. The image forming apparatus 101 according to the present exemplary embodiment includes an image that is not included in the actual document in any one of a plurality of steps until an image is read from the document to generate a final output image (image reading process). Is added to generate the final output image. For example, a lower “white image area” 801 in the “scanner I / F portion output image” on the surface of the document in FIG. 8A indicates an additional image output from the scanner I / F 109 after the white plate is read by the scanner 114. ing. 8B, the lower “slashed area” 802 in the “scanner image processing unit input image” on the back side of the document is scanned from the back side page buffer 502 (page buffer) to perform scanner image processing by performing idle reading described later. An additional image input to the unit 116 is shown. For example, when reading back-side image data from the page buffer, data in other areas in the page buffer is read idle before or after reading the area in the page buffer where the back-side image data is stored. As a result, an image that is not included in the actual document can be added to the image destination or image end of the back image data.

Hereinafter, the double-sided reading process shown in the flowcharts of FIGS. 6A and 6B will be described in detail.
The processing shown in FIGS. 6A and 6B is started and executed by the CPU 103 when the user places a document on the ADF 207 or the user instructs the use of the document reading function via the operation unit 112, for example. .

  First, in step S <b> 601, the CPU 103 receives an input (designation) of scan mode setting (reading setting) from the user via the operation unit 112. Here, designation of reading settings such as color mode (color / monochrome), duplex mode (ON / OFF), document orientation (portrait / landscape), opening direction (up / down / left / right), and document size is accepted. In the following, the document orientation: “Portrait” indicates a portrait document (portrait document), and the document orientation: “Landscape” indicates a landscape document (landscape document). Also, the opening direction: “upper and lower opening” indicates a document that is printed on both sides so that the top and bottom of the image is the same on both sides of the document when the document is turned upside down. Manuscript). Opening direction: “Left and right open” indicates a document that has been printed on both sides so that the top and bottom of the image is the same on both sides of the document when the left end (or right end) of the document is turned over. .

  For example, in the example of FIG. 8A, the document image orientation: “vertically long”, the opening direction: “left / right opening”, and the document size: “LGL” are set. In the example of FIG. 8B, the document image direction: “vertically long”, the opening direction: “vertical opening”, and the document size: “LGL” are set. In the example of FIG. 9A, the document image orientation: “Landscape”, the opening direction: “Left / Right”, and the document size: “LGL” are set. In the example of FIG. 9B, the document image orientation: “Landscape”, the opening direction: “Upper and lower opening”, and the document size: “LGL” are set. In the example of FIG. 10A, the document image orientation: “vertically long”, the opening direction: “left / right opening”, and the document size: “LTR” are set. In the example of FIG. 10B, the document image orientation: “vertically long”, the opening direction: “vertical opening”, and the document size: “LTR” are set. In the example of FIG. 11A, the document image orientation: “Landscape”, the opening direction: “Left / Right”, and the document size: “LTR” are set. In the example of FIG. 11B, the document image direction: “Landscape”, the opening direction: “Upper and lower opening”, and the document size: “LTR” are set.

  In step S602, the CPU 103 receives a scan start instruction from the user. When the user places a document on the ADF 207 of the scanner 114 and gives an instruction to start scanning via the operation unit 112, the CPU 103 detects this instruction and advances the process to S603.

  In S603, the CPU 103 sets the document size (designated document size) received in S601 as the surface image size.

  Next, in S604, the CPU 103 performs parameter setting for inputting the read image data of the surface image size set in S603 to the surface image data input block 301 of the scanner I / F 109. In step S605, the CPU 103 performs parameter setting for the scanner image processing unit 116 to perform image processing of the read image data having the surface image size.

In step S606, the CPU 103 sets the back image size to the maximum document size that can be read by the image forming apparatus. In the image forming apparatus 101 of this embodiment, the maximum readable document size is set to “LGL (LEGAL)”.
Next, in S607, the CPU 103 acquires (reserves) from the RAM 105 the back page buffer 502 having a memory size corresponding to the image data amount of the back image size set in S606. The real page buffer 502 is a ring buffer that moves to the start address when the end address of the buffer is reached.

Next, in S608, the CPU 103 sets the back side image tip adjustment mode to “OFF”.
In step S609, the CPU 103 sets the back image end adjustment mode to “OFF”.
Note that the back-side image destination adjustment mode is for setting whether or not to perform image-side adjustment by idle reading described later on the back side. The back side image end adjustment mode is for setting whether or not to perform image end adjustment by idle reading described later on the back side. When the back side image tip adjustment mode / back side image end adjustment mode is “OFF”, no idle reading is performed, and when it is “ON”, empty reading is performed.

  Thereafter, in S610, S611, and S614, the CPU 103 determines the instruction content (reading setting) of the original image direction and the opening direction received in S601.

First, when it is determined that the document image orientation is “vertically long” and the opening direction is “up and down” (corresponding to FIGS. 8B and 10B described later) (YES in S610 and YES in S611), the CPU 103 determines in S612. Set the back side image adjustment mode to “ON”.
Also, when it is determined that the document image orientation is “horizontal” and the opening direction is “left and right opening” (corresponding to FIGS. 9A and 11A described later) (NO in S610 and YES in S614), the CPU 103 also performs S615. In, the back side image tip adjustment mode is set to “ON”.

  As described above, when the document orientation is “portrait” and the opening direction is “up and down”, or the document orientation is “landscape” and the opening direction is “left and right opening”, the document reading reference end (the leading end in the document transport direction) And the image reference end (the upper end of the image on the document) are different on the front surface and the back surface. For example, FIGS. 8B and 9A. In this case, as shown in FIG. 7A (a), the designated image size is read from the back side of the document and the image data stored in the back page buffer 502 is read out as shown in FIG. 7A (b). That is, when reading from the back-side page buffer 502, it is necessary to first read the image destination offset, and then read back-side image data and input it to the scanner image processing unit 116. For this purpose, the back side image tip adjustment mode is set to “ON”.

If it is determined in S610 to S611 that the document image orientation is “portrait” and the opening direction is “left and right opening” (corresponding to FIG. 8A and FIG. 10A) (YES in S610 and NO in S611), the CPU 103 performs S613 , The back side image end adjustment mode is set to “ON”.
Further, when it is determined that the document image orientation is “landscape” and the opening direction is “up and down” (corresponding to FIGS. 9B and 11B described later) (NO in S610 and NO in S614), the CPU 103 also performs S616. , The back side image end adjustment mode is set to “ON”.

  As described above, in the case of document orientation: “portrait” and opening direction: “left-right opening”, or document orientation: “landscape” and opening direction: “vertical opening”, as shown in FIGS. 8A, 9B, etc. The positional relationship between the document reading reference end and the image reference end is the same on the front and back sides. In this case, as shown in FIG. 7B (c), the designated image size is read from the back side of the document and the image data stored in the back page buffer 502 is read out as shown in FIG. 7B (d). That is, when reading from the back-side page buffer 502, it is necessary to read back-side image data first, and subsequently read the end-of-screen offset and input it to the scanner image processing unit 116. For this purpose, the back side image end adjustment mode is set to ON.

  As described above, in S610 to S616, by determining the reading setting, it is determined whether or not the positional relationship between the leading end of the document in the conveyance direction and the upper end of the image of the document is different on both sides of the document. Based on this, settings are made for the back side image tip adjustment mode and the back side image end adjustment mode.

  After the processing of S612, S613, S615, or S616, the CPU 103 sets parameters for inputting image data of the back image size set in S606 to the back image data input block 302 of the scanner I / F 109 in S617. I do. That is, reading of the back surface image is set with the size corresponding to the maximum document size (here, LGL) as the upper limit.

  Thereafter, in S618, the CPU 103 starts image processing of the surface image data by the scanner image processing unit 116. In step S619, the CPU 103 starts image data input processing for each of the front and back surfaces by the scanner I / F 109, and starts conveyance of the document loaded on the document tray 205.

  After the processing of S618 and S619, the CPU 103 executes the front surface image data input processing / image processing shown in S620 to S624 and the back surface image data input processing shown in S625 to S627 in parallel.

<Surface image data input processing / image processing (S621 to S624)>
First, input processing / image processing (S621 to S624) of surface image data will be described.
In S621, the CPU 103 determines whether or not the input of the surface image data to the surface image data input block 301 of the scanner I / F 109 is completed. In the image forming apparatus 101 of this embodiment, when the input of the image data for the surface image size set in S603 is completed, it is determined that the input of the surface image data is completed.

  If it is determined in S621 that the input of the surface image data has not been completed (NO in S621), the CPU 103 waits for the completion of the input of the surface image data in S621. On the other hand, if it is determined that the input of the surface image data has been completed (YES in S621), the CPU 103 advances the process to S622. In S622, the CPU 103 stops the process of the surface image data input block 301 of the scanner I / F 109, and advances the process to S623.

  In step S623, the CPU 103 determines whether the scanner image processing unit 116 has completed the image processing on the surface image data. In the image forming apparatus 101 of the present embodiment, it is determined that the surface image processing is completed when the image processing for the image data equivalent to the image size input to the surface image data input block 301 of the scanner I / F 109 is completed.

In S623, when the scanner image processing unit 116 determines that the image processing for the surface image data has not yet been completed (NO in S623), the CPU 103 waits for the completion of the surface image processing in S623. On the other hand, when the scanner image processing unit 116 determines that the image processing for the surface image data has been completed (YES in S623), the CPU 103 advances the process to S624.
In step S624, the CPU 103 stops the processing of the scanner image processing unit 116, and ends the surface image data input processing / image processing (S621 to S624).

  As described above, in the surface image data input process, the surface image data can be read with the document size set in S603 (that is, the designated document size accepted in S601) as an upper limit. When the designated document size exceeds the actual document size, the white plate is read after the rear end in the document transport direction, and the white plate image is added to the rear end of the document surface image. In the image processing of the surface image data, the image processing by the scanner image processing unit 116 of the surface image data can be executed with the document size set in S604 (that is, the designated document size accepted in S602) as an upper limit. For example, as shown in FIG. 8A, an LGL size image is read from the surface of a document (LTR size) and a white plate, subjected to image processing, and output.

<Backside image data input processing (S625 to S627)>
Next, back surface image data input processing (S625 to S627) will be described.
In S625, the CPU 103 determines whether or not the input of the back surface image data is completed. In the image forming apparatus 101 of the present embodiment, when the input of the image data for the back image size set in S606 is completed, it is determined that the input of the back image data is completed. If it is determined that the input of the back image data has been completed (YES in S625), the CPU 103 stops the processing of the back image data input block 302 of the scanner I / F 109 in S625.

On the other hand, when it is determined that the input of the back surface image data has not yet been completed (NO in S625), the CPU 103 advances the process to S626.
In step S626, the CPU 103 determines whether the ADF 207 of the scanner 114 has detected the trailing edge of the document. If it is determined that the paper trailing edge of the document has not yet been detected (NO in S626), the CPU 103 returns the process to S625.
On the other hand, if it is determined that the trailing edge of the document has been detected (YES in S626), the CPU 103 stops the processing of the back side image data input block 302 of the scanner I / F 109 in S627. Then, the CPU 103 ends the back surface image data input process (S625 to S629).

  As described above, the back side image data of the actual document size can be read with the designated document size as the upper limit. For example, as shown in FIGS. 8 and 9, even when the designated document size (LGL) exceeds the actual document size (LTR), an LTR size image is read from the back side of the LTR size document, and the page buffer for the back side. Stored in 502.

  After completion of both the front surface image data input processing / image processing shown in S621 to S624 and the back side image data input processing shown in S625 to S627 (that is, after the parallel processing), the CPU 103 executes S628. Proceed with the process.

  In S628, the CPU 103 acquires the value of the document sub-scanning length. Specifically, the CPU 103, based on the difference in timing when the document detection sensor 220 detects the leading edge and the trailing edge of the document 208 when the document 208 is conveyed by the ADF 207 for inputting the document image as described above. To calculate the document sub-scanning length.

  In step S629, the CPU 103 determines whether the original sub-scanning length acquired in step S628 is smaller than the original size accepted in step S601. If it is determined that the original sub-scanning length acquired in S628 is smaller than the original size accepted in S601 (YES in S629), the CPU 103 advances the process to S630.

In S630, the CPU 103 updates the back side image size set in S606 with a document size corresponding to the document sub-scanning length acquired in S629.
Next, in S631, the CPU 103 determines whether or not the back side image tip adjustment mode is “ON”. If it is determined that the back-surface image adjustment mode is “ON” (YES in S631), the CPU 103 determines in S632 that the back-surface image pre-reading amount (for example, pre-image pre-reading as shown in FIG. 7A (b)). The number of lines) is calculated and set, and the process proceeds to S634.

On the other hand, when it is determined that the back side image tip adjustment mode is “OFF” (NO in S631), the CPU 103 sets the back side image tip blank reading amount to “0” in S633, and proceeds to S634.
The back side image pre-reading amount represents the number of lines for pre-reading the area before the image destination of the back image data temporarily stored in the back page buffer 502. In addition, the area for the back side image pre-reading amount is set as the back side image pre-reading area.

  In S634, the CPU 103 determines whether or not the back side image end adjustment mode is “ON”. If it is determined that the back side image end adjustment mode is “ON” (YES in S634), the CPU 103 determines in S635 that the back side image end blank reading amount (for example, the end of image end blank reading as shown in FIG. 7B (d)). The number of lines) is calculated and set, and the process proceeds to S640.

On the other hand, if it is determined in S634 that the back side image end adjustment mode is “OFF” (NO in S634), the CPU 103 sets the back side image end blank reading amount to “0” in S636 and the processing in S640 To proceed.
The back side image end blank reading amount represents the number of lines in which the area after the end of the back side image data temporarily stored in the back page buffer 502 is read idle. In addition, the back side image end blank reading area is set as the back side image end blank reading region.

  If it is determined in S629 that the document sub-scanning length acquired in S628 is not smaller than the document size received in S601 (NO in S629), the CPU 103 advances the process to S637.

  In step S637, the CPU 103 updates the back side image size set in step S606 with the original size accepted in step S601. Next, in S638, the CPU 103 sets the back side image tip blank reading amount to “0”. In step S639, the CPU 103 sets the back side image end blank reading amount to “0”, and proceeds to step S640.

In S640, the CPU 103 sets the back image size set in S630 or S637 to the “back image size” + “size corresponding to the back side image blank reading amount” + “size corresponding to the back side image end blank reading amount”. Update to
Next, in S641, the CPU 103 performs input masking setting for the back side image front idle reading area to the scanner image processing unit 116 based on the back side image front idle reading amount set in S632, S633, or S638. In S642, the CPU 103 performs input masking setting for the back side image end blank reading area to the scanner image processing unit 116 based on the back side image end blank reading amount set in S635, S636, or S639. With these input masking settings, the scanner image processing unit 116 performs white masking on the image of the set area when performing image processing.

  In step S643, the CPU 103 performs parameter setting for performing image processing of the back surface image data on the scanner image processing unit 116. Here, the image size set in S640 is set as the back image size.

  Next, in S644, the CPU 103 sets the image destination idle reading offset of the back page buffer 502 based on the back image destination idle reading amount set in S632, S633, or S638. Specifically, as shown in FIG. 7A (b), the CPU 103 determines that the back side image pre-reading is obtained by multiplying the back side image pre-reading amount (number of lines) by the image size (memory size) per line. Let the size of the area be the destination offset size. Further, the CPU 103 reads the image data of the scanner image processing unit 116 so that the back side image data is read from the address obtained by subtracting the image destination offset size from the end address of the back side page buffer 502 which is a ring buffer. Configure input settings. Further, as shown in FIG. 7B (d), the CPU 103 determines the size of the back end blank reading area obtained by multiplying the back end blank reading amount (number of lines) by the image size (memory size) per line. This is the end-of-screen offset size. Note that the total size of data read from the back page buffer 502 starting from the image destination blank reading offset is obtained by adding the image destination offset size and the image end offset size to the data size of the original sub-scanning length. Value. Further, the value obtained by adding the image destination offset size and the image end offset size to the data size corresponding to the document sub-scanning length matches the data size corresponding to the document size received in S601.

Next, in S645, the CPU 103 starts the back side image processing by the scanner image processing unit 116.
Next, in S646, the CPU 103 determines whether or not the back surface image processing by the scanner image processing unit 116 has been completed. If it is determined that the back image processing has not been completed (NO in S646), the CPU 103 waits for completion of the back image processing in S646. On the other hand, if it is determined that the back image processing has been completed (YES in S646), the CPU 103 advances the process to S647.

In S647, the CPU 103 stops the process of the scanner image processing unit 116.
In step S648, the CPU 103 releases the back page buffer and ends the reading process for the document.
With the above processing, it is possible to add an image that has been insufficient at the time of reading the back side of the document to the end of the back side image data or the image destination in the back side page buffer 502 and input it to the scanner image processing unit 116.

Hereinafter, FIGS. 7 to 11 will be described.
FIG. 7A (a) shows temporary storage of the back image in the back page buffer 502 when the image orientation of the document is “vertically long” and the opening direction is “vertical open”. FIG. 7A (b) shows the input of the back image to the scanner image processing unit 116 when the image orientation of the original is “portrait” and the opening direction is “vertical opening”. In this case, the back side image data of the designated document size is read from the address obtained by subtracting the image destination offset size from the end address of the back side page buffer 502 and input to the scanner image processing unit 116. That is, back side image data in which an image of the back side image front blank reading area is added to the image side is input to the scanner image processing unit 116.

  FIG. 7B (c) shows the temporary storage of the back image in the back page buffer 502 when the image orientation of the document is “vertically long” and the opening direction is “left and right open”. FIG. 7B (d) shows the input of the back image to the scanner image processing unit 116 when the image orientation of the document is “portrait” and the opening direction is “left / right opening”. In this case, the back side image data of the designated document size is read from the top address of the back side page buffer 502 and input to the scanner image processing unit 116. That is, the back side image data in which the image of the back side image pre-read area is added to the end of the screen is input to the scanner image processing unit 116.

  As described above, FIG. 8 and FIG. 9 show an example of an output image when double-sided scanning is performed with the LGL size specified as the document size for the document whose actual document size is the LTR size. FIG. 10 and FIG. 11 show an example of an output image when duplex scanning is executed by designating an LTR size as a document size for a document having an actual document size of LTR.

  FIG. 8A shows an output image when the image orientation of the document is “portrait” and the opening direction is “left-right opening”. In this case, the designated document size is longer than the actual document size, and the positional relationship between the reading reference end and the image reference end is the same on the front and back surfaces. For this reason, the back side is also read from the image reference end (upper end of the image) in the same manner as the front side. Therefore, the back side image buffer of the actual document size is stored in the back side page buffer 502 as shown in FIG. 7B (c). In this case, as shown in FIG. 7B (d), the back side image end blank reading amount is set as a difference amount between the actual document size and the designated document size in the document conveyance direction. That is, the valid data range in the back page buffer 502 is a range from the top address of the back page buffer 502 to the designated document size. As a result, an effective image in which an image that has been insufficient at the time of document reading is added to the end of the image is input from the back page buffer 502 to the scanner image processing unit 116.

  FIG. 8B shows an output image when the image orientation of the document is “portrait” and the opening direction is “vertical opening”. In this case, the designated document size is longer than the actual document size, and the positional relationship between the reading reference edge and the image reference edge is different between the front surface and the back surface. For this reason, unlike the front surface, the back surface is read from a direction opposite to the image reference end (image upper end). Therefore, the back side image buffer of the actual document size is stored in the back side page buffer 502 as shown in FIG. In this case, as shown in FIG. 7A (b), the back side image pre-reading amount is set as a difference amount between the actual document size and the designated document size in the document transport direction. That is, the valid data range in the back page buffer 502 is a range from the address obtained by subtracting the above-described difference amount from the end address of the back page buffer 502 to the designated document size. As a result, an effective image in which an image lacking at the time of document reading is added to the image destination is input from the back page buffer 502 to the scanner image processing unit 116.

FIG. 9A shows an output image when the image orientation of the document is “landscape” and the opening direction is “left-right opening”. This case is similar to FIG. 8B.
FIG. 9B shows an output image when the image orientation of the document is “horizontal” and the opening direction is “vertical opening”. This case is similar to FIG. 8A.

FIG. 10A shows an output image when the image orientation of the document is “portrait” and the opening direction is “left-right opening”. FIG. 10B shows an output image when the image orientation of the document is “portrait” and the opening direction is “vertical opening”.
FIG. 11A shows an output image when the image orientation of the document is “landscape” and the opening direction is “left-right opening”. FIG. 11B shows an output image when the image orientation of the document is “landscape” and the opening direction is “up and down”.

  In both cases of FIGS. 10 and 11, the LTR size is designated as the document size for the document whose actual document size is the LTR size. Thus, the actual document size is the same as the designated document size. Therefore, the entire image input from the scanner 114 matches the effective image regardless of the positional relationship between the reading reference end and the image reference end on the front surface and the back surface. Therefore, the valid data range in the back page buffer 502 is determined as the specified document size from the top address of the back page buffer 502 regardless of the positional relationship between the reading reference end and the image reference end on the front and back sides. . Therefore, both the back side image blank reading amount and the back side image end blank reading amount are “0”. That is, in this case, no idle reading is performed.

  As described above, according to this embodiment, the double-sided image reading apparatus with limited hardware resources such as an image processor and a memory has the following effects. It is possible to output the back image corresponding to the output position and output range of the front image and obtain the desired output result for a double-sided document where the positional relationship between the reading reference edge and the image reference edge is different on the front and back sides. Become. That is, it is possible to output the back image corresponding to the output position and output range of the front image with a simple configuration without impairing the productivity, and it is possible to obtain a desired output result.

  In the above embodiment, considering the productivity and the like, the back side image data is read at the actual document size regardless of the positional relationship between the reading reference end and the image reference end on the front side and the back side. The configuration has been described in which the back side image front blank reading amount and the back side image blank reading amount are determined according to whether the positional relationship between the reading reference edge and the image reference edge is different between the front surface and the back surface. However, when the positional relationship between the reading reference edge and the image reference edge is the same on the front surface and the back surface (for example, FIG. 8A, FIG. 9B, etc.), the back side image data is configured to be read at a specified original size as with the front surface. May be. That is, when the designated document size exceeds the actual document size, the image data read from the white plate by the scanner 114 may be input from the scanner 114 for the range exceeding the document size. In this case, the range of image data input to the scanner image processing unit 116 is the same as that on the surface.

In addition, the structure of the various data mentioned above and its content are not limited to this, You may be comprised with various structures and content according to a use and the objective.
Although one embodiment has been described above, the present invention can take an embodiment as, for example, a system, apparatus, method, program, or storage medium. Specifically, the present invention may be applied to a system composed of a plurality of devices, or may be applied to an apparatus composed of a single device.
Moreover, all the structures which combined said each Example are also contained in this invention.

(Other examples)
The present invention supplies a program that realizes one or more functions of the above-described embodiments to a system or apparatus via a network or a storage medium, and one or more processors in a computer of the system or apparatus read and execute the program This process can be realized. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.
Further, the present invention may be applied to a system composed of a plurality of devices or an apparatus composed of a single device.
The present invention is not limited to the above embodiments, and various modifications (including organic combinations of the embodiments) are possible based on the spirit of the present invention, and these are excluded from the scope of the present invention. is not. That is, the present invention includes all the combinations of the above-described embodiments and modifications thereof.

101 Image forming device
103 CPU
105 RAM
109 Scanner I / F
114 scanner
116 Scanner image processor

Claims (11)

An image reading unit that includes a conveyance unit that conveys a document along a document conveyance path, and a first reading unit and a second reading unit on both sides of the document conveyance path, and is capable of reading both sides of the document conveyed on the conveyance path. A device,
Storage means used as a page buffer for storing image data read from the original by the second reading means;
Designating means for designating the reading setting of the document;
Detection means for detecting a document conveyed on the conveyance path;
The original is conveyed by the conveying means, and the first surface of the original is read by the first reading means based on the reading setting designated by the designation means, and the original of the original is read by the second reading means. Control means for controlling parallel processing for reading two surfaces and executing parallel reading processing of the second surface for storing in a page buffer secured in the storage means;
The control means performs the parallel processing based on a determination result as to whether or not the reading setting is a reading setting in which a positional relationship between the leading end of the document in the transport direction and the upper end of the image of the document is the same on both sides of the document. Based on the original size designated as the reading setting and the original detection of the detection means at the image destination or the end of the image data of the second surface read by the second reading means and stored in the page buffer. An image reading apparatus that adds an image based on a difference amount in the conveyance direction from a detected document size.   The control means, when reading out the image data of the second surface from the page buffer, before or after reading the area where the image data of the second surface of the page buffer is stored, 2. The image reading apparatus according to claim 1, wherein the image is added to an image destination or an image end of the image data of the second surface by reading out data of an amount based on the difference amount of a region. The page buffer is a ring buffer;
When the reading relationship is different for both sides of the document, the control means determines the effective range for reading the image data of the second side from the page buffer from the end address of the ring buffer. The image reading apparatus according to claim 2, wherein an address corresponding to is subtracted from an address corresponding to the designated document size. The page buffer is a ring buffer;
In the case of the reading setting in which the positional relationship is the same on both sides of the document, the control means determines the effective range to be read when reading the image data of the second side from the page buffer from the head address of the ring buffer. The image reading apparatus according to claim 2, wherein the image reading apparatus has a range corresponding to the designated document size.   The control unit controls the reading process of the first surface in the parallel processing by setting the reading range of the first reading unit as the document size specified as the reading setting, and sets the reading range of the second reading unit, 2. The reading process of the second surface in the parallel processing is controlled as a range from the leading end to the trailing end of the conveyed document with the document size specified as the reading setting as an upper limit. The image reading device according to any one of? The reading setting includes a setting for designating whether the document is a portrait document or a landscape document, a setting for designating whether the document is a vertically opened document or a horizontally opened document, and a setting for designating a document size of the document,
The control unit determines that the positional relationship is a different reading setting on both sides of the document when a vertically long document and a vertically opened document or a horizontally long document and a horizontally opened document are designated as the reading setting, and When a vertically long document and a horizontally opened document or a horizontally long document and a vertically opened document are designated as the reading setting, it is determined that the positional relationship is the same reading setting on both sides of the document. Item 6. The image reading apparatus according to any one of Items 1 to 5. Image processing means for performing image processing on image data read from the document;
7. The control unit according to claim 1, wherein when the image processing unit performs image processing on the image data of the second surface, the control unit inputs data to which the image is added to the image processing unit. The image reading apparatus according to claim 1.   When the image processing unit causes the image processing unit to perform image processing on the image data of the second surface, the data corresponding to the region to which the image is added among the data input to the image processing unit is the image processing unit. The image reading apparatus according to claim 7, wherein the image reading apparatus is controlled to cause the means to execute an input masking process.   In the parallel processing, the control unit reads the first surface by the first reading unit, and sequentially performs image processing on the image data read from the first surface by the image processing unit. The second reading means reads the second surface and stores the image data read from the second surface in the page buffer in parallel, and after the parallel processing is completed, 9. The image reading apparatus according to claim 7, wherein control is performed so that data read from a page buffer is processed by the image processing means. A conveyance unit that conveys a document along a document conveyance path; and a first reading unit and a second reading unit that are provided on both sides of the document conveyance path, and capable of reading both sides of the document conveyed on the conveyance path; A control method for an image reading apparatus, comprising: storage means used as a page buffer for storing image data read from the original by the second reading means; and detection means for detecting the original conveyed on the conveyance path. And
A specifying step for specifying the reading setting of the document;
The original is conveyed by the conveying means, and the first surface of the original is read by the first reading means based on the reading setting designated in the designation step, and the first reading of the original is made by the second reading means. A parallel processing step of reading two sides and storing the second side in a page buffer in parallel;
The second reading is performed in the parallel processing step based on a determination result of whether the reading setting is a reading setting in which the positional relationship between the leading edge of the document in the conveyance direction and the upper end of the image of the document is the same on both sides of the document. A document detected based on the document size specified as the reading setting and the document detection of the detection unit at the image destination or the end of the image data of the second surface read by the device and stored in the page buffer An addition step of adding an image based on a difference amount in the transport direction with respect to a size;
An image reading apparatus control method comprising:   The program for functioning a computer as a control means of any one of Claims 1-9.

Images