JP2004320314A - Image scanner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image scanner by suppressing a memory capacity from being increased through the use of a memory in common and effectively utilizing the memory so as to reduce the cost of the apparatus and enhance the transmission efficiency. <P>SOLUTION: The image scanner is provided with: a read section 10 comprising a CCD 10a for applying photoelectric conversion to an image on an original, an analog / digital converter 10b for applying analog / digital conversion to an output signal of the CCD 10a and an image processing section 10c for applying image processing to a digital signal, and reading the image of the original front face; a read section 20 comprising similarly a CCD 20a for applying photoelectric conversion to the image on the original, an analog / digital converter 20b for applying analog / digital conversion to an output signal of the CCD 20a and an image processing section 20c for applying image processing to the digital signal, and reading the image of the original rear face; a memory control section 50 for controlling write/read of a memory 51; the memory 51 for storing image data of the read sections 10, 20; and various I/Fs40 for establishing interfacing with an external device. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an image reading device, and more particularly, to a method for storing image data read from a plurality of image reading devices in a common memory.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, when image data read by a document reading unit is transferred to a bus having a different processing speed, a memory for temporarily storing and storing data is necessary to absorb the speed difference. For example, when reading both sides of one page of a document at the same time, two memories and a memory control device are provided to process image data read by two reading units (corresponding to the front and back sides of the document) in the apparatus in parallel. There is a need.
FIG. 8 is a block diagram of a conventional image reading apparatus capable of reading both sides. This image reading apparatus stores image data processed by a reading unit 110 that reads an image on the front surface of a document and a reading unit 120 that reads an image on the back surface of the document before transferring the data to various I / Fs 140. The image data is temporarily accumulated and stored in the memory 112 and the memory 122 via the control unit 111 and the memory control unit 121. Then, the memory is selected and read in response to a request from various I / Fs 140, and the image data on the front surface or the back surface is transferred via the selector 130.
Japanese Patent Application Laid-Open No. Hei 7-298008 discloses a technique for minimizing an increase in cost and transferring each read image data on both sides of a document to an external device in a short time. According to this, when the image reading section performs an image reading operation on both sides of a document, the image data on the front side (first side) is transferred to a host computer as an external device, and the image data on the back side (second side) is transferred to a RAM. Then, after each transfer process is completed, the image data is read from the RAM and transferred to the host computer. Alternatively, during a continuous image reading operation of a plurality of documents by the image reading unit, the image data on the front side of the first document is transferred to the host computer, and the image data on the back side thereof is transferred to the RAM. Are transferred to the RAM, and the respective image data are sequentially read from the RAM and transferred to the host computer.
[Patent Document 1] JP-A-7-298008
[0003]
[Problems to be solved by the invention]
The conventional image reading apparatus capable of double-sided reading shown in FIG. 8 requires twice as many memory control units and memories as the apparatus for reading either the front side or the back side, resulting in a significant increase in cost. There's a problem.
When image data read simultaneously on both sides is to be processed in page units, two memories or areas (front and back sides) are required for reading one page. If the system reads and transfers data for one page and then processes the next page, the number of memories or the division of the area may be fixed (two), but before the data transfer for one page is completed. When reading the next page is started, a memory area (page division) is further required.
Normally, image data transfer to the outside of the reading device is not performed simultaneously for both sides, but is performed by selecting either one. Therefore, when reading is performed simultaneously on both sides, the data on either side is read. It must be stored once in memory. Further, since the image data amount varies depending on the reading conditions (linear density) of the original, a memory capacity corresponding to the reading conditions is required. However, if the capacity is large, the cost is inevitably increased, and if the capacity is small, the memory overflows. There is a problem such as doing.
When both sides are read simultaneously, if the number of pages of image data stored and stored in the memory is one for each of the front and back sides, it is only necessary to set the side to be transferred, but a plurality of pages are stored and stored in the memory. In this case, if only the surface setting is performed, the transfer is normally performed in the order written in the memory, and the transfer order cannot be arbitrarily changed.
In addition, when the memory area of the image reading apparatus has a plurality of pages, if the image data read by the document reading unit is written into the memory for one page and then read (transferred), the memory is not effectively used.
Patent Document 1 saves memory and suppresses cost increase by alternately storing front and back image data using a RAM and a host computer, but the total capacity of the memory does not change. However, only half of the memory is replaced by the memory of the host computer, and the cost of the system as a whole does not decrease.
The present invention has been made in view of the above problems, and it is an object of the present invention to provide an image reading apparatus in which the memory is commonly used to suppress an increase in the memory capacity, and the memory is effectively used to reduce the cost of the apparatus and increase the transfer efficiency. I do.
[0004]
[Means for Solving the Problems]
In order to solve the above problem, the present invention is directed to an image reading unit that generates image data by photoelectrically converting an image on a document, and a storage unit that stores the image data generated by the image reading unit. In the image reading apparatus provided with the above, in order to store image data read from at least two or more image reading units in a common storage unit or to read out from the storage unit, a storage area of the storage unit is designated. A memory control unit having an address control unit and a data control unit that performs control for reading image data stored in the storage unit is provided.
In order to simultaneously read and store image data on the front and back of a document by a conventional image reading apparatus, a reading unit and a memory are separately required on the front and back of the document. In addition, a separate memory control unit is required to control each memory. However, in order to transfer image data to the host, it is impossible to transfer the image data at the same time. Therefore, the other data is stored in the memory until the transfer of one of the data is completed. As described above, two memories and two control circuits are required for simultaneous reading, which is a heavy cost. Therefore, in the present invention, in order to store different data in a common memory, an address control unit for recognizing which data is stored in which area of the memory, and to accurately read different data from the common memory And a memory control unit having a data control unit for controlling data. As a result, different data stored in the common memory can be accurately stored and read, and the memory capacity can be reduced, the memory can be effectively used, and the cost of the apparatus can be reduced.
According to the invention, since the memory control unit includes the address control unit and the data control unit, it is possible to accurately store and read different data stored in the common memory. And the cost of the apparatus can be reduced.
The memory control unit may set the total capacity of the storage capacity by setting the total capacity of the storage capacity of the storage means and the reading surface of the document read by the image reading means in the address control unit. It is characterized in that the document is equally divided into two parts, and the divided surfaces are stored in correspondence with the read surface of the document.
In the present invention, the total capacity of the memory and the information of whether the original to be read is front or back are set in the address control unit, the capacity is equally divided into half from the total capacity of the memory, and the front and back of the original are stored in each area. Is stored individually.
According to this invention, since the front and back image data of the document are stored in half of the memory capacity, the control is simplified, the circuit configuration is simplified, and the cost can be reduced.
[0005]
The memory control unit may set the total capacity of the storage capacity by setting the total capacity of the storage capacity of the storage means and the number of pages of the document read by the image reading means in the address control unit. It is characterized in that the number of pages of the document is equally divided into the number of pages of the document and the number of pages of the document is stored in correspondence with each divided capacity.
According to the present invention, the total capacity of the memory and the total number of pages of the original to be read are set in the address control unit, the total capacity of the memory is equally divided by the total number of pages, and information of each page of the original is individually stored in each area. It is something to remember.
According to this invention, since the memory capacity is divided by the number of pages and the image data of each page is stored in the divided capacity, the correspondence between the pages and the memory addresses becomes easy, and the control can be simplified.
Preferably, the memory control unit sets the total amount of storage capacity of the storage unit, the number of pages of the document read by the image reading unit, and the data amount of each page in the address control unit, A total storage capacity is divided according to the data amount of each page, and the divided capacity is stored in correspondence with the number of pages of the document.
Image data recorded on each page of the document is not necessarily the same. Therefore, the data amount is generally different for each page. Therefore, in the present invention, the data amount of each page is set, and the memory capacity is allocated to each page according to the data amount.
According to this invention, the memory capacity is allocated according to the data amount of each page, and the image data of each page is stored at the address of the allocated capacity, so that the entire memory area can be effectively utilized. .
[0006]
According to a fifth aspect of the present invention, the memory controller sets, in the address controller, the total storage capacity of the storage unit, the number of pages of the document read by the image reading unit, and the data amount of each page. By dividing the total capacity of the storage capacity according to the data amount of each page, storing the divided capacity in association with the number of pages of the document, and setting a read page in the address control unit, The image data corresponding to the set page is read out from the storage means.
According to the present invention, when storing image data, a memory capacity is allocated according to the data amount of a page in the same manner as in claim 4, and when reading data, an arbitrary page can be read by designating a page to be read. It becomes possible.
According to this invention, the memory capacity is allocated according to the data amount of each page number, and the image data of each page is stored at the address of the allocated capacity, and the page can be specified when reading out the image data. Can be effectively used, and an arbitrary page can be read, thereby increasing convenience.
7. The memory control section according to claim 6, wherein the operation of sequentially storing the image data of each page read by the image reading section corresponding to the reading surface of the document in the storage section is completed, The image data for each one page is sequentially read, and when the reading is completed, the operation shifts to a storage operation for the next page.
In the writing and reading operations of the memory of the present invention, the front and back sides of the first page are read simultaneously, all the image data is written to the memory, then all the data on the front and back sides are read from the memory and transferred to various I / Fs. Thereafter, the second page is read, and thereafter, the same operation is repeated.
According to this invention, since the writing and reading operations are performed for each page, the control is simplified and the program capacity is reduced.
[0007]
8. The image processing apparatus according to claim 7, wherein the memory control unit sequentially stores the image data of each page read by the image reading unit corresponding to the reading surface of the document in the storage unit, and after the storage operation of all pages is completed. The image data for each one page is sequentially read from the storage means, and the reading is continuously performed until reading of all pages is completed.
The write and read operations of the memory of the present invention include reading the front and back surfaces of the first page simultaneously, writing all the image data to the memory, and then reading the front and back surfaces of the second page simultaneously and writing all the image data to the memory. The operation is repeated for all pages, and when the write operation of all pages is completed, all data on the front and back surfaces of the first page is read from the memory and transferred to various I / Fs. The operation of reading all data from the memory and transferring it to various I / Fs is repeated over all pages.
According to this invention, the write operation is first performed over all pages, and then the read operation is performed over all pages. Therefore, the same operation is continuously performed, so that the control is simplified, and the write and read operations are performed. Switching is the minimum number.
9. The image processing device according to claim 8, wherein the memory control unit sequentially stores the image data of each page read by the image reading unit corresponding to the reading surface of the document in the storage unit. Is started, and when the reading is completed, the operation shifts to the storage operation of the next page.
There are two types of memories: a type in which writing and reading operations are individually performed, and a FIFO type memory in which writing and reading operations can be performed simultaneously. In the memory using the FIFO, the front and back surfaces of the first page are simultaneously read, and when the image data is written to the memory to some extent, reading from the memory is started (writing and reading are arbitrated by the memory control unit). When the processing of the first page is completed, reading of the second page is started.
According to this invention, the reading from the memory is started when the image data is written to the memory to some extent, so that the access time of the apparatus can be shortened accordingly.
[0008]
10. The image processing apparatus according to claim 9, wherein the memory control unit sequentially stores the image data of each page read by the image reading unit corresponding to the reading surface of the document in the storage unit. , And when the storage operation of the storage means is completed, the operation shifts to the next page storage operation.
According to the present invention, the write operation of the second page is further accelerated. As a method, the front and back surfaces of the first page are simultaneously read, and reading from the memory is started when image data is written to the memory to some extent (writing and reading are arbitrated by the memory control unit). When the writing of the first page is completed, the writing of the second page is started, and when the reading of the first page is completed, the reading of the second page is started.
According to this invention, the reading from the memory is started when the image data is written to the memory to some extent, and the writing of the next page is started when the writing operation is completed, so that the access time of the apparatus can be further shortened. .
A tenth aspect of the present invention is characterized in that the storage means is a first-in first-out (FIFO) type memory.
The memory is roughly classified into a static type, a dynamic type, and a FIFO type. The static type and the dynamic type cannot be read during data writing, and vice versa. That is, the write and read operations are performed individually. However, the FIFO type can read data already written during writing. In addition, it is possible to change the writing and reading speeds.
According to this invention, since the FIFO type memory is used as the memory, the data transfer speed can be increased.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail using embodiments shown in the drawings. However, the components, types, combinations, shapes, relative arrangements, and the like described in this embodiment are not merely intended to limit the scope of the present invention but are merely illustrative examples unless otherwise specified. .
FIG. 1 is a block diagram of an image reading apparatus according to an embodiment of the present invention. The image reading apparatus comprises a CCD 10a for photoelectrically converting an image on a document, an A / D converter 10b for A / D converting the signal, and an image processing unit 10c for image processing of a digital signal. A reading unit 10 for reading, a CCD 20a for photoelectrically converting an image on a document, an A / D converter 20b for A / D converting the signal thereof, and an image processing unit 20c for image processing a digital signal are also provided. A reading unit 20 for reading an image on the back surface; a memory control unit 50 for controlling writing and reading of a memory 51; a memory 51 for storing image data of the reading units 10 and 20; An I / F 40 is provided.
Next, a schematic operation of the image reading apparatus will be described. The image data processed by the reading unit 10 for reading the image on the front side of the document and the reading unit 20 for reading the image on the back side of the document are transmitted through the memory control unit 50 via the memory control unit 50 before being transferred to the various I / Fs 40. Data is temporarily accumulated and stored in the memory 51. Then, in response to a request from the various I / Fs 40, reading from the memory is performed, and image data on the front surface or the back surface is transferred.
[0010]
FIG. 2 is a diagram showing an outline of control of the memory control unit 50 and the memory 51 according to the first embodiment of the present invention. Here, the memory control unit 50 stores the image data read from the reading units 10 and 20 in FIG. 1 in the common memory 51 or reads out the memory 51 from the address control unit 50 a that specifies a storage area of the memory 51. And a data control unit 50b that performs control for reading image data stored in the memory 51. Then, a CPU (not shown) that controls the system of the image reading apparatus sets the total capacity 15 of the memory mounted on the system and the reading surface 16 (front or back, or both sides simultaneously. Is set in the memory control unit 50, the memory control unit 50 equally divides the total capacity of the memory 51 into two areas, area 1 and area 2 (where the total capacity is X, the areas 1 and 2). The capacity of each is X / 2), and the data of the front surface and the back surface are stored and stored in the respective areas. Then, by enabling the read start 25 by the CPU, the image data stored and stored in the area 1 is transferred to the various I / Fs 40 as the transfer data 19. After the data transfer in the area 1 is completed, the image data stored and stored in the area 2 is transferred to the various I / Fs 40 by starting reading again. As described above, since the front and back image data of the document are stored in half of the memory capacity, the control is simplified, the circuit configuration is simplified, and the cost can be reduced.
[0011]
FIG. 3 is a diagram showing a control outline of the memory control unit 50 and the memory 51 in the second embodiment of the present invention. The same components are denoted by the same reference numerals, and duplicate description will be omitted. FIG. 3 differs from FIG. 2 in that data of 26 pages is input to the address control unit 50a instead of the reading surface 16. In this embodiment, the CPU (not shown) that controls the system of the image reading apparatus sets the total capacity 15 of the memory mounted on the system and the number of divided areas (number of pages) 26 in the memory control unit 50, The memory control unit 50 equally divides the total capacity of the memory 51 from the area 1 to the area n (n is the number of divided areas set by the CPU) (where the total capacity is X, the capacity of the area 1 to the area n is X / n) When the front and back surfaces, and further, a plurality of pages are continuously read, the data is stored and stored in each area in page units. Then, by enabling the reading start 26 by the CPU, first, the image data stored and stored in the area 1 is transferred as the transfer data 19 to the various I / Fs 40. By starting reading again after the data transfer of the area 1 is completed, the image data of the area 2 is transferred, and similarly the image data up to the area n are transferred to the various I / Fs 40. As described above, since the memory capacity is divided by the number of pages and the image data of each page is stored in the divided capacity, correspondence between pages and memory addresses becomes easy, and control can be simplified.
[0012]
FIG. 4 is a diagram showing a control outline of the memory control unit 50 and the memory 51 according to the third embodiment of the present invention. The same components are denoted by the same reference numerals, and duplicate description will be omitted. FIG. 4 differs from FIG. 3 in that a data amount (page capacity) 27 of each page is further added. In this embodiment, a CPU (not shown) that controls the system of the image reading apparatus determines the total capacity 15 of the memory mounted in the system, the number of divided areas (number of pages) 26 and the capacity 27 of each area by the memory control unit 50. , The memory control unit 50 divides the total capacity of the memory 51 from the area 1 to the area n (n is the number of divided areas set by the CPU), and determines the capacity of each food area. Further, when the front and back surfaces and a plurality of pages are continuously read, the data is stored and stored in each area in page units. By enabling the read start 25 by the CPU, first, the image data stored and stored in the area 1 is transferred to the various I / Fs 40. By starting reading again after the data transfer in the area 1 is completed, the image data in the area 2 is transferred this time, and thereafter the image data up to the area n is similarly transferred to the respective I / Fs 40. As described above, the memory capacity is allocated according to the data amount of each page, and the image data of each page is stored at the address of the allocated capacity, so that the entire memory area can be effectively used.
[0013]
FIG. 5 is a diagram showing a control outline of the memory control unit 50 and the memory 51 in the fourth embodiment of the present invention. The same components are denoted by the same reference numerals, and duplicate description will be omitted. FIG. 5 differs from FIG. 4 in that a read page 28 is further added. In this embodiment, a CPU (not shown) that controls the system of the image reading apparatus determines the total capacity 15 of the memory mounted in the system, the number of divided areas (number of pages) 26 and the capacity 27 of each area by the memory control unit 50. , The memory control unit 50 divides the total capacity of the memory 51 from the area 1 to the area n (n is the number of divided areas set by the CPU), and determines the capacity of each frame area. When the front and rear surfaces and a plurality of pages are continuously read, the data is stored and stored in each area in page units. Then, after setting a read page 28 to be read by the CPU, by starting reading, the image data stored and stored in an arbitrary area is transferred to the various I / Fs 40 as the transfer data 19. After the data transfer of a certain area is completed, by setting a read page again and starting reading, image data of a different arbitrary area is transferred to the various I / Fs 40 this time. In this way, the memory capacity is allocated according to the data amount of each page, and the image data of each page is stored at the address of the allocated capacity, and the page can be specified when reading out the image data, so that the entire memory area can be effectively used. It is possible to read out an arbitrary page while utilizing it, and the convenience is improved.
[0014]
FIG. 6 is a diagram showing the memory control when the two-sided simultaneous reading of FIGS. 2 to 5 is performed for two pages. FIG. 6A shows the frame operation (1), and FIG. 6B shows the frame operation (2). Here, the frame operation (1) means that the front and back sides of the first page are simultaneously read in the area A, all the image data is written in the memory, and then all the front and back data are read out of the memory in the area B to perform various operations. After transferring the data to the I / F, the front and back surfaces of the second page are simultaneously read in the area C, and all the image data is written to the memory. Transfer operation. Since the writing and reading operations are performed for each page in this manner, the control is simplified and the program capacity can be reduced.
The frame operation {circle around (2)} means that the front and back sides of the first page of the area A are simultaneously read, all the image data are written to the memory, and then the front and back sides of the second page are simultaneously read in the area C and all the image data is stored in the memory. Write to. Then, in the area B, all the data on the front and back surfaces of the first page are read from the memory and transferred to various I / Fs. Then, in the area D, all the data on the front and back surfaces of the second page are read from the memory. This is an operation of transferring data to F. As described above, the write operation is first performed over all pages, and then the read operation is performed over all pages. Therefore, the same operation is continuously performed, so that the control is simplified, and the switching between the write operation and the read operation is performed. Only the minimum number is required.
[0015]
FIG. 7 is a diagram showing the memory control when two pages of the double-sided simultaneous reading are performed. FIG. 7A shows the FIFO operation (1), and FIG. 7B shows the FIFO operation (2). In the FIFO operation (1), the front and back surfaces of the first page are simultaneously read in the area A, and when image data is written to the memory to some extent, reading from the memory is started in the area B (writing and reading are performed by the memory control unit 50). When the processing of the first page is completed, the front and back sides of the second page are simultaneously read in the area C, and when the image data is written to the memory to some extent, the reading from the memory is started in the area D. Is what you do. In the FIFO operation {circle around (2)}, the front and back surfaces of the first page are simultaneously read in the area A, and when image data is written to the memory to some extent, reading from the memory is started in the area B (writing and reading are performed by the memory control unit 50). Arbitration management) When the writing of the first page is completed, the writing of the second page is started in the area C, and when the reading of the first page is completed, the reading of the second page is started in the area D. It is.
As described above, the reading from the memory is started when the image data is written to the memory to some extent, and the writing of the next page is started when the writing operation is completed, so that the access time of the apparatus can be further shortened.
[0016]
【The invention's effect】
As described above, according to the first aspect of the present invention, since the memory control unit includes the address control unit and the data control unit, different data stored in the common memory can be accurately stored and read. In addition, the memory capacity can be reduced and the memory can be effectively used, and the cost of the apparatus can be reduced.
Further, since the front and back image data of the document are stored in half of the memory capacity, the control can be simplified, the circuit configuration can be simplified, and the cost can be reduced.
According to the third aspect, since the memory capacity is divided by the number of pages and the image data of each page is stored in the divided capacity, correspondence between pages and memory addresses is facilitated, and control can be simplified.
According to the fourth aspect, the memory capacity is allocated according to the data amount of each page, and the image data of each page is stored at the address of the allocated capacity, so that the entire memory area can be effectively utilized. .
According to the present invention, the memory capacity is allocated according to the data amount of each page, and the image data of each page is stored in the address of the allocated capacity, and the page can be specified when reading out the image data. Can be effectively used, and an arbitrary page can be read, thereby increasing convenience.
In addition, since writing and reading operations are performed for each page, the control is simplified, and the program capacity can be reduced.
According to the seventh aspect, the write operation is first performed over all pages, and then the read operation is performed over all pages. Therefore, the same operation is continuously performed, so that the control is simplified, and the write and read operations are performed. Switching is the minimum number.
According to the eighth aspect, since reading from the memory is started when image data is written to the memory to some extent, the access time of the apparatus can be shortened accordingly.
According to the ninth aspect, the reading from the memory is started when the image data is written to the memory to some extent, and the writing of the next page is started when the writing operation is completed, so that the access time of the apparatus can be further shortened. .
In the tenth aspect, since a FIFO type memory is used as the memory, the data transfer speed can be increased.
[Brief description of the drawings]
FIG. 1 is a block diagram of an image reading apparatus according to an embodiment of the present invention.
FIG. 2 is a diagram showing an outline of control of a memory control unit 50 and a memory 51 according to the first embodiment of the present invention.
FIG. 3 is a diagram illustrating an outline of control of a memory control unit 50 and a memory 51 according to a second embodiment of the present invention.
FIG. 4 is a diagram illustrating an outline of control of a memory control unit 50 and a memory 51 according to a third embodiment of the present invention.
FIG. 5 is a diagram showing an outline of control of a memory control unit 50 and a memory 51 according to a fourth embodiment of the present invention.
FIG. 6 is a diagram showing memory control when two pages of the double-sided simultaneous reading of FIGS. 2 to 5 of the present invention are performed on two pages;
FIG. 7 is a diagram showing memory control when two pages of double-sided simultaneous reading according to the present invention are performed.
FIG. 8 is a block diagram of a conventional image reading apparatus capable of performing double-sided reading.
[Explanation of symbols]
Reference numeral 10: a reading unit for reading an image on the front surface of a document; 20, a reading unit for reading an image on the back surface of a document; 40 various I / Fs; 50 memory control unit;

Claims (10)

An image reading apparatus comprising: an image reading unit configured to photoelectrically convert an image on a document to generate image data; and a storage unit configured to store image data generated by the image reading unit.
An address control unit that specifies a storage area of the storage unit in order to store image data read from at least two or more of the image reading units in a common storage unit, or read from the storage unit; An image reading apparatus, comprising: a memory control unit having a data control unit for performing control for reading out stored image data. The memory control unit equally divides the total storage capacity into two by setting the total storage capacity of the storage unit and the reading surface of the document read by the image reading unit in the address control unit. 2. The image reading apparatus according to claim 1, wherein the reading surface of the document is stored in correspondence with each divided capacity. The memory control unit sets the total storage capacity of the document by the address control unit by setting the total capacity of the storage capacity of the storage unit and the number of pages of the document read by the image reading unit. 2. The image reading apparatus according to claim 1, wherein the image reading device stores the document in a manner that the number of pages of the document corresponds to each divided capacity. The memory control unit sets the total capacity of the storage capacity of the storage unit, the number of pages of the document to be read by the image reading unit, and the data amount of each page in the address control unit, thereby setting the total capacity of the storage capacity. 2. The image reading apparatus according to claim 1, wherein the image data is divided according to the data amount of each page, and the number of pages of the document is stored in correspondence with each divided capacity. The memory control unit sets the total storage capacity of the storage unit, the number of pages of a document read by the image reading unit, and the data amount of each page in the address control unit, thereby setting the total storage capacity. The capacity is divided according to the data amount of each page, and the number of pages of the document is stored in correspondence with the respective divided capacity, and the readout page is set in the address control unit, so that the set page is obtained. 2. The image reading apparatus according to claim 1, wherein corresponding image data is read from the storage unit. After completing the operation of sequentially storing each page of image data read by the image reading unit corresponding to the reading surface of the document in the storage unit, the memory control unit reads the image data of each page from the storage unit. The image reading apparatus according to claim 1, wherein the image data is sequentially read, and when the reading is completed, the process shifts to a storage operation of a next page. The memory control unit sequentially stores the image data of each page read by the image reading unit corresponding to the reading surface of the document in the storage unit, and after the storage operation of all pages is completed, The image reading apparatus according to claim 3, wherein the image data of each one page is sequentially read, and the reading is continuously performed until reading of all pages is completed. The memory control unit starts reading the image data from the storage unit while sequentially storing the image data of each page read by the image reading unit corresponding to the reading surface of the document in the storage unit. 6. The image reading apparatus according to claim 1, wherein when the reading is completed, the operation shifts to a next page storage operation. The memory control unit starts reading the image data from the storage unit while sequentially storing the image data of each page read by the image reading unit corresponding to the reading surface of the document in the storage unit. 6. The image reading apparatus according to claim 1, wherein when the storage operation of the storage unit is completed, the process shifts to a storage operation of a next page. The image reading device according to claim 8, wherein the storage unit is a first-in first-out (FIFO) type memory.

Images