JP2001103292A - Image rotation processing device and image rotation processing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an image rotation processing device whose access speed is increased. SOLUTION: A control signal generating section 105 generates an address and a control signal that are used to access a memory 100 storing image data of a read original. An address generating section 102 generates addresses whose access direction is rotated by 0 degree, 90-degrees, 180-degrees and 270-degrees with respect to a write direction. A state management section 104 manages a access direction of a rotation direction management section 103 by the management of the state of the rotation angle and the scanning number of times. Succeeding read data are sequentially written in the same addresses as those read through rotation in the unit of accesses, the rotation read and write are sequentially executed and succeeding data are written to the same address as that of the rotation read by using four reads of a color image for one processing unit. The read address and the write address are selected the same to save a memory capacity and to quicken the access time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image rotation processing apparatus and an image rotation processing method, and more particularly to, for example, reading out image rotation control of a digital copier / image processing apparatus. And an image rotation processing method and an image rotation processing method in which storage capacity is reduced by repeatedly performing writing and writing in order.

[0002]

2. Description of the Related Art Conventionally, an image rotation processing apparatus generally has a memory for two frames, and realizes rotation by rotating data held in one frame and writing the data in another frame. For example, Japanese Patent Publication No. Hei 7-104925 and Japanese Patent Application Laid-Open No. 5-128246 of the prior art 1 have a square size memory and realize rotation.

[0003] Further, Japanese Patent Application Laid-Open No.
In the method of No. 2, when writing the original (a) as shown in FIG. 18, writing is performed as shown in FIG.
The original (d) is written at the same time as the rotation is read as shown in (c). In another method, when writing the original (d), in order to reduce the waste of memory as shown in FIG. 18 (e), the position of the unused portion not written in FIG. 18 (b) is reduced. Writing is performed as shown in FIG. 18 (e).

[0004]

However, in the conventional rotation processing, the memory is provided for two frames, and the rotation is realized by rotating the data held in one frame and writing the data in another frame. Will increase.
In addition, although reading and writing are performed in parallel by using about one frame of memory as in the above-described related art, the number of memories is reduced. In the related art 1, rotation is performed on a square document. When a rectangular document is rotated as shown in (1), a memory larger than the document is required, and the memory is wasted. Further, the conventional example 2 has a problem that the address in the case where the reading and the writing are performed alternately is different, and the advantage of the conventional example 1 is that the high-speed access by making the same reading and writing of the address generation cannot be utilized. Accompany.

SUMMARY OF THE INVENTION An object of the present invention is to provide an image rotation processing apparatus and an image rotation processing method in which the use efficiency of a memory is increased and the access speed is increased.

[0006]

In order to achieve the above object, an image rotation processing apparatus according to the first aspect of the present invention comprises: an image rotation processing apparatus for rotating a color image; A memory for holding image data of the original document, a means for generating an address and a control signal for accessing the memory,
Means for generating an address rotated by 180 degrees, 270 degrees, means for sequentially writing the next read data in the same address as the address read by rotation in units of access, and means for performing rotation read and write in order to sequentially perform color reading. Means for taking four readings of an image as one processing unit,
It is characterized in that write processing of the next data is performed at the same address as the rotational read.

According to a second aspect of the present invention, in the image rotation processing apparatus according to the first aspect, the memory has three blocks, and the three blocks are configured separately into one square portion and two rectangular portions. .

According to a third aspect of the present invention, in the image rotation processing apparatus according to the second aspect, the size M × M of the square portion is set to two sides in a direction when the document is not rotated and a direction when the document is rotated by 90 degrees. The two blocks of the rectangular portion are the same size and have a size of M × N, and the size M × N is determined by the direction when the document is not rotated and the direction when the document is rotated by 90 degrees. The rotation process is performed according to a memory size configuration in which the positions of the two sides are aligned so that the document does not overlap.

According to a fourth aspect of the present invention, in the image rotation processing method for rotating a color image,
A step of reading an image of a document, a step of storing image data of the read document, a step of generating an address and a control signal for accessing the storage step, and a step of writing an access direction in generating the address. Generating an address rotated by 0 degrees, 90 degrees, 180 degrees, and 270 degrees, sequentially writing next read data to the same address as the address read by rotation in access units, Writing is performed in order, and reading of the color image four times is set as one processing unit, and the writing process of the next data is performed at the same address as the rotation reading.

According to a fifth aspect of the present invention, in the image rotation processing method according to the fourth aspect, the storing step has three blocks, and the three blocks are configured separately into one square portion and two rectangular portions. You.

According to a sixth aspect of the present invention, in the image rotation processing method according to the fifth aspect, the size M × M of the square portion is determined by determining the positions of two sides in a direction when the document is not rotated and a direction when the document is rotated by 90 degrees. The two blocks of the rectangular portion are the same size and have a size of M × N, and the size M × N is determined by the direction when the document is not rotated and the direction when the document is rotated by 90 degrees. The rotation process is performed according to a memory size configuration in which the positions of the two sides are aligned so that the document does not overlap.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of an image rotation processing apparatus and an image rotation processing method according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 to FIG. 17 show an embodiment of an image rotation processing apparatus and an image rotation processing method according to the present invention.

(First Embodiment) FIG. 1 shows an image rotation processing apparatus according to an embodiment of the present invention. A memory 100 for storing data and an image rotation control apparatus 1 for performing image rotation processing.
It is a figure which shows the example of a block structure of No. 01.

An image rotation control device 101 is a circuit for generating a signal for memory access, and includes an address generation unit 102, a rotation direction management unit 103, a state management unit 104 for managing a state in which data is held, and a control signal. Generator 10
5. An R / W management unit 106 for managing switching between read and write, a data input / output control unit 107 for controlling the data input / output direction, and timing adjustment units 108 and 109 for matching data timing.

When data written in a memory as shown in FIG. 2 in the direction of an arrow is read out in the same direction (FIG. 2).
In (a)), the rotation of the image is 0 degree. But,
When reading is performed as shown in FIG. 2B, the rotation is 90 degrees. When reading is performed as shown in FIG.
80 degrees. When reading is performed as shown in FIG. 2D, the rotation becomes 270 degrees.

Consider the formation of a color image. The color image original is subjected to data processing (four scans or the like) for four colors in order to form a four-color KYCM. When rotating the read document, it is assumed that data processing for four colors is sequentially rotated. For example, a case where a 90-degree rotation is performed on a vertical document as shown in FIG. 2 will be described. It is assumed that data for four colors is read by a scanner and scanned four times.

FIG. 3 is a diagram for explaining access to the memory, and shows an example of a reading and writing procedure when a vertical document is rotated by 90 degrees. It should be noted that FIG.
(E) is an explanatory diagram of access for four colors in the case of a color original. At the time of the first scan, as shown in FIG. 3A, the images are sequentially read in the arrow direction 301, and the images are stored in the memory in the same direction as the original. At the time of the second scan, as shown in FIG. 3B, the image data (dotted portion) stored by the first scan is rotated 90 degrees and read. The data input in the second scan is written to the same address after reading.

The reading of the 90-degree rotation in FIG. 2B is sequentially read as indicated by an arrow 302, and one line is read up to the rear end where the image is stored. Writing is performed in order as indicated by an arrow 303, and one line has a length input by scanning. For this reason, the length is shorter than the readout. However, the relationship between the read and write lengths may be reversed depending on the length and width of the document. The control of reading and writing is such that reading is performed for each dot and one dot is written at the same address. Thus, in the third scan, the arrow 304 reads out and the arrow 305 writes as shown in FIG. In the fourth scan, an arrow 306 reads out and an arrow 307 writes as shown in FIG. This means that the output of (three colors) has been performed up to the fourth scan. Finally, at the time of output of the fourth color, control of only reading in the direction of the arrow (FIG.
(E)) is performed.

To show the flow, writing to the memory is performed in the first scan. In the second scan, rotation reading of the first data and data writing of the second scan are performed. In the third scan, rotation reading of the second data and data writing of the third scan are performed.
In the fourth scan, rotation reading of the third data and data writing of the fourth scan are performed. The fifth time,
This is the fourth data read from the memory. When the rotation is performed by 90 degrees, 180 degrees, and 270 degrees, respectively, the results are as shown in FIGS. 4A to 4C. Note that reference numerals 1, 2, 3, and 4 shown in FIG.

The memory requires a partial shape other than the hatched portion. As shown in FIG. 5, the reading and writing in the case where the read original is rotated 90 degrees in the horizontal direction are performed as shown in FIG.
FIG. 5E shows the result. 90 degrees, 180 degrees,
In the case of performing the rotation of 270 degrees, FIG.
The result is as shown in FIG. In addition, the code | symbol 1 shown in the figure,
2, 3, and 4 are read start positions in order.

The memory requires a partial shape other than the hatched portion. The memory requires a portion as shown in FIG. The memory address mapping and control for using the memory having such a shape will be described.

The shapes shown in FIG. 7 are referred to as blocks a to f. FIG. 8 is an explanatory diagram of the address mapping of the memory. Each block is mapped as a block a to a block f and a block g as shown in FIG. Block f is a mapping in a rotated form. Here, the block g is an unused portion.

In the form shown in FIG. 8, the line 800 is located at a position immediately above the head 800 after the end 800 of the one line.
It is assumed to be a one-dimensional mapping of 2. FIG. 9 is an explanatory diagram of a memory access direction. FIG. 10 is a block diagram showing a rotation processing example 2. The direction of accessing the memory having such an address mapping is as shown in FIG.
And the arrow directions of reference numerals 1 to 13 shown in FIGS.

FIG. 11 is an explanatory diagram of reading and writing when a vertical document is rotated by 90 degrees, in which the directions are adjusted to address mapping. Respectively,
Considering the access direction, reference numerals 2, 5, 8, 9, 10,
Reference numeral 11 denotes access in one direction, reference numeral 5 is a reference point, reference numeral 8 is an address shifted in the x direction, reference numeral 9 is an address shifted in the y direction, and reference numerals 2, 10, and 11 are both in the x and y directions. Control is performed as access from the shifted address.

Similarly, access is made in one direction by reference numerals 3, 7, 12, and 13. Address 3 is shifted in the y direction with reference to reference code 7, and references 12 and 13 are shifted in the x and y directions. It is controlled as access from the address. Also, access in one direction is indicated by reference numerals 1 and 6,
The control is performed at an address in which the code 1 is shifted in the x direction based on the code 6. Reference numeral 4 indicates access in one direction.

(Operation Example) The control operation of the memory will be described with reference to the circuit diagram of FIG. As shown in FIG.
It is assumed that rotation is performed by degrees and reading and writing are controlled as shown in FIG. The data obtained by reading the document is input as input data 119. Timing adjustment unit 109
, Timing with a signal for writing to the memory is taken. The timed data is input by switching the input / output of the data input / output control unit 107.

The input / output switching of the data input / output control unit 107 is performed by reading and writing by the control signal generation unit 105. In the case of reading, processing is performed from the memory 100 to the image rotation control device 101, and in the case of writing, processing is performed from the image rotation control device 101 to the memory 100.

The control signal generator 105 is for generating a signal for accessing the memory 100. WE, CS, RAS, and CAS are generated as control signals. The input / output of the data input / output control unit 107 is switched by the WE generated here.

The repetition of reading and writing is shown in FIG.
In the first scan of (a), only writing is performed. 2
At the time of the first scan, reading and writing are repeated for each dot, but only writing is performed in the area 310 and only reading is performed in the area 311. The three types of control are managed by R / W control of the R / W management unit 106.

For simplicity, the following description will be made on the assumption that alternate control of reading and writing is (R / W), reading is (R), and writing is (W). The read is generated by the read generation unit 116, and the write is generated by the write generation unit 117.

The control management by the R / W management unit 106 is as follows.
This is performed according to the size of the document, the number of scans, and the rotation direction. For example, the number of scans is 2, the vertical Y of the document size,
Information of horizontal X, Y> X, and 90-degree rotation is read / written by R / W management unit 106
It is assumed that The R / W control by the R / W management unit 106 repeats (R / W) → (W) from the information of Y> X and the second 90-degree rotation, and determines that the control is (R). Based on the judgment of the R / W management unit 106, the selection unit 115 selects one of reading by the reading generation unit 116 and writing by the writing generation unit 117. The correspondence between these determination conditions and their controls is as follows. In the following ":", the left side (") is the condition and the right side (") is the control. Here, “→” of the control indicates that it changes in the middle of one line. ',' Indicates control that changes after a few lines.

90-degree rotation First time: (W) 90-degree rotation Y> X second, third, fourth: (R / W) → (W), (R) X <Y second, third, fourth: (R / W) → (R), (W) 90-degree rotation Fifth rotation: (R)

Such information is provided as a control method condition depending on each rotation and the length and width of the original, and a 90-degree rotated vertical original,
The document has information of a 180 ° rotated horizontal document, a 180 ° rotated vertical document, a 180 ° rotated horizontal document, a 270 ° rotated vertical document, and a 270 ° rotated horizontal document. However, the above “→” and “,” are numerical data and the like. This switching of the control is performed in accordance with the address generation unit 102.

The state management unit 104 manages the rotation angle and the number of scans. The access direction of the rotation direction management unit 103 is managed by the state management of the state management unit 104. The access direction will be described.

In the case of FIG. 3B, access is performed in the direction of reference numeral 1 and the direction of reference numeral 11 in FIG.
Access to block abcd and block f shown in FIG. These pieces of information are created by the rotation direction management unit 103. The direction of reference numerals 1 to 12 is determined by the access direction of the rotation direction management unit 103. The codes 1 to 12 are generated by the address generator 102 as follows.

The direction 1 address 110 generates an address in the access direction denoted by reference numeral 4 in FIG. Direction 2 address 1
Numeral 11 generates an address in the access direction indicated by reference numeral 6 in FIG. 9, and reference numeral 1 can be generated by setting a value shifted in the x direction as an offset value.

The direction 3 address 112 generates an address in the access direction indicated by reference numeral 5 in FIG. 9, and the reference numeral 8 sets a value shifted in the x direction as an offset value. Code 9
Sets a value shifted in the y direction as an offset value. Symbols 2, 10, and 11 set values that shift in the x and y directions as offset values.

The direction 4 address 113 generates an access direction address indicated by reference numeral 7 in FIG.
Sets a value shifted in the y direction as an offset value.

In the case of FIG. 3B, the access direction of the code 1 and the access direction of the code 11 are used, and the direction 2 address and the direction 3 address are controlled. The switching between the direction 2 and the direction 3 is switched to the direction 3 address after the generation by the direction 2 address is completed. The direction control is shown below.

First time: Direction 1 address 4 Second time: Direction 2 address 1, Direction 3 address 11 Third time: Direction 3 address 2 → Direction 3 address 13, Direction 3 address 10 Fourth time: Direction 4 address 3 → Direction 4 address 125th: direction 1 address 4 By performing control in this way, the rotation control according to the first aspect of the present invention can be performed.

(Second Embodiment) FIG. 10 is a block diagram showing the configuration of the image rotation control device 1001 and a memory 1000 for storing data. Image rotation control device 100
Reference numeral 1 denotes a circuit for generating a signal for memory access, which includes an address generation unit 1002, a rotation direction management unit 1003 of an access order management unit that manages access order and management of switching between reading and writing. A state management unit 1004 that manages the number of scans and a rotation angle that are held, a control signal generation unit 1005,
Data input / output control unit 100 for controlling data input / output direction
7. It comprises timing adjusters 1008 and 1009 for adjusting data timing.

The control operation of the memory will be described with reference to the circuit diagram of FIG. It is assumed that a vertical document as shown in FIG. 11 is rotated by 90 degrees. Data obtained by reading a document is input from input data 1019. Timing adjustment unit 100
9 is a control signal generator 1005 and an address generator 1
The timing is adjusted by the address and the control signal created in step 002. The timed data is input to the input / output switching of the data input / output control unit 1007.

The input / output switching of the data input / output control unit 1007 is performed by reading and writing by the control signal generation unit 1005. In the case of reading, switching is performed from the memory 1000 to the image rotation control device 1001, and in the case of writing, switching is performed from the image rotation control device 1001 to the memory 1000.

The control signal generation unit 1005
0 to access control signals WE, CS, RAS,
Create a CAS. The input / output of the data input / output control unit 1007 is switched by the control signal WE generated here. Reading and writing are only (W) control in the first scan. At the time of the second scan, (R / W) control is performed for each dot, but (W) control is performed in the portion of 1101, and in the portion of 1102,
(R) Control. The three kinds of access are managed by the rotation direction management unit 1003.

The read control signal is supplied to the read generator 10.
16, the write control signal is generated by the write generation unit 1017, and these read generation units 1016 are controlled by the access management by the rotation direction management unit 1003.
And the signal generated by the write generation unit 1017 are selected by the read / write selection unit 1015. It also manages memory blocks to be accessed. The management of the memory block will be described later.

Access management by the rotation direction management unit 1003 is performed based on the size of the document, the number of scans, and the rotation direction. For example, if the number of scans is two, and document size Y> X and Y> X, and information of 90-degree rotation is obtained, (R / W) → (W) is repeated, and the control of (R) and to decide. These correspond to the judgment conditions and their controls as follows. Note that the condition is on the left side of ':' and the control is on the right side. Here, “→” of the control indicates that it changes in the middle of one line. ',' Indicates control that changes after the end of the memory block.

First 90-degree rotation: (W) Second, third, and fourth rotation of 90-degree rotation Y> X: (R / W) → (W), (R) Second, third, and fourth rotation of X <Y: (R / W) → (R), (W) 90-degree rotation Fifth rotation: (R)

Such information is provided in the rotation direction management unit 1003 by discriminating each rotation direction and the length and width of the document, and the judgment is made. The state management unit 1004 manages the rotation angle and the number of scans. The address is generated by the address generation unit 10
02.

When the original is vertical at a rotation of 90 degrees, as shown in FIG. 11, data is written in the first scan as shown in FIG.
Reading and writing are performed as shown in FIG. FIG. 11C shows the third scan, and FIG. 11 shows the fourth scan.
(D). The fifth time is only reading from the memory.

In FIG. 11, the shorter arrow indicates reading, and the longer arrow indicates writing. Similarly, when the document is horizontal, the result is as shown in FIG. FIG. 12 is an explanatory diagram of reading and writing when the horizontal document is rotated by 90 degrees, in which three blocks of the memory are mapped. FIG.
FIG. 3 is an explanatory diagram of blocking necessary parts. Also,
FIG. 14 is an explanatory diagram of the address mapping of the memory. These three blocks are divided into a square portion and a rectangular portion, and the square portion is a portion where the two sides are aligned and overlapped in the directions when the document is not rotated and when the document is rotated 90 degrees. The rectangular part is the rest. It is a block of a square part and a rectangular part (halftone and oblique lines) in FIGS. This block
As shown in FIG. 13, if “a”, “b”, and “c” are used,
The mapping is made as shown in FIG. Address generation in such a mapping will be described.

The address generation unit 1002 creates an address by managing the state of the state management unit 1004 and the access order of the rotation direction management unit 1003. Rotation direction management unit 100
The access order management of No. 3 holds information on the access order as shown in FIGS.

FIG. 16 shows the processing in the case of FIG. 11, and FIG. 17 shows the processing in the case of FIG. In FIGS. 16 and 17, “→” means that the access address shifts in the middle of one line. ',' Means when the access of the previous block is completed. The information “→”, “,” is represented as data that can be processed in the access management unit of the rotation direction management unit 1003. actually,
Numerical data and the like. Here, it is used for ease of explanation.

FIG. 15 is an explanatory diagram of the access direction.
FIG. 16 and FIG. 17 are explanatory diagrams of information for access. For example, in the case of FIG. 16, in the first scan, the memory area of the block “a” is controlled in the direction of address control in the “4” direction based on the information “a4 → b4”. Next, the memory area of the block “b” is performed in the address control order in the “4” direction. The directions are numbers as shown in FIG. 15, and as shown in FIG. 13, each memory block has all the address control directions.

In the second scan, “a1 → b1, c2”
Then, the block "a" is performed in the direction of "1" in the order of address control, and then the memory area of the block "b" is performed in the direction of "1" in the order of address control. This process is repeated for each line. When the blocks “a” and “b” are completed, the area of the block “c” is performed in the “2” direction in the address control order. Thus, the processing up to five times is sequentially performed. The blocks to be accessed and the order for generating the addresses as shown in FIG. 16 are held in the rotation direction management unit 1003, and the memory is accessed accordingly. These pieces of information include information on the rotation angle and the length and width of the document. By performing control in this way,
Rotation control becomes possible.

[0055]

As is clear from the above description, the image rotation processing apparatus and the image rotation processing method of the present invention repeatedly perform reading and writing in order as memory control during rotation, and perform reading and writing of address generation. Same. In addition, the area is divided into blocks by memory address mapping to reduce waste. This makes it possible to reduce the number of memories and generate read and write addresses as the same address, thereby increasing the access speed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of an image rotation processing apparatus according to the present invention.

FIG. 2 is a conceptual diagram illustrating an operation example 1 in a rotation direction.

FIG. 3 shows access to a memory when a vertical document is rotated by 90 degrees. FIGS.
FIG. 9 is an explanatory diagram of access for a color.

FIG. 4 is a diagram illustrating a case where a vertical document is rotated by 90 degrees, 180 degrees, and 270 degrees.

FIG. 5 is an explanatory diagram of reading and writing when a horizontal document is rotated by 90 degrees.

FIG. 6 is an explanatory diagram of a necessary memory portion when rotating a horizontal document by 90 degrees, 180 degrees, and 270 degrees.

FIG. 7 is an explanatory diagram of blocks of necessary parts.

FIG. 8 is an explanatory diagram of address mapping of a memory;

FIG. 9 is an explanatory diagram of a memory access direction.

FIG. 10 is a block diagram illustrating a rotation processing apparatus according to a second embodiment.

FIG. 11 is an explanatory diagram of reading and writing when a vertical document is rotated by 90 degrees.

FIG. 12 is an explanatory diagram of reading and writing when a horizontal document is rotated by 90 degrees.

FIG. 13 is an explanatory diagram of blocking necessary parts.

FIG. 14 is an explanatory diagram of address mapping of a memory;

FIG. 15 is an explanatory diagram of an access direction.

FIG. 16 is an explanatory diagram of information for access.

FIG. 17 is an explanatory diagram of information for access.

FIG. 18 is a conceptual diagram for explaining a conventional technique.

[Explanation of symbols]

100, 1000 Memory 101, 1001 Image rotation control device 102, 1002 Address generation unit 103, 1003 Rotation direction management unit 104, 1004 State management unit 105, 1005 Control signal generation unit 106 R / W management unit 107, 1007 Data input / output control Units 108, 109, 1008, 1009 Timing adjustment unit 110 Direction 1 address generation unit 111 Direction 2 address generation unit 112 Direction 3 address generation unit 113 Direction 4 address generation unit 115 Selection unit 116, 1016 Read generation unit 117, 1017 Write generation unit 119, 1019 Input data 302, 303, 304, 305, 306, 307 Access direction 800 Start address 801 Back end of first line 802 Start of second line 1010 Block a control unit 1011 Block b control 1012 block c controller 1014 block control selecting section 1015 read / write selector

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 1/46 H04N 1/46 Z F term (Reference) 5B057 BA02 BA11 CA01 CA08 CA12 CB01 CB08 CB12 CC01 CD03 CH11 5C073 AA02 BB02 CE04 5C076 AA24 BA03 BA04 5C077 LL17 LL18 MM30 MP08 NP05 PP22 PP33 PP38 PP68 PQ22 TT06 5C079 HB03 JA01 LA36 MA02 NA10 NA11 NA13 PA01 PA02

Claims (6)

[Claims] 1. An image rotation processing apparatus for rotating a color image, comprising: means for reading an image of a document; a memory for holding image data of the read document; and an address and control signal for accessing the memory. Means for generating the address, means for generating an address whose access direction is 0, 90, 180, or 270 degrees with respect to writing in the generation of the address; Means for sequentially writing data in access units; and means for performing the rotation reading and writing in order to make four readings of a color image as one processing unit, wherein the next data is stored at the same address as the rotation reading. Performing an image writing process. 2. The image rotation processing device according to claim 1, wherein the memory has three blocks, and the three blocks are separately configured into one square portion and two rectangular portions. Image rotation processing device. 3. The image rotation processing apparatus according to claim 2, wherein the size M × M of the square portion is such that two sides are aligned in a direction when the document is not rotated and a direction when the document is rotated by 90 degrees, and the size of the document is overlapped. The two blocks of the rectangular part are the same size,
It has a size of M × N, and the size M × N is rotated by a memory size configuration in which two sides are aligned in a direction in which the document is not rotated and a direction in which the document is rotated by 90 degrees so that the document does not overlap. An image rotation processing device for performing processing. 4. An image rotation processing method for rotating a color image, comprising: a step of reading an image of a document; a storage step of holding image data of the read document; and an address for accessing the storage step. A step of generating a control signal; a step of generating an address in which the access direction is rotated by 0, 90, 180, or 270 degrees with respect to writing in the generation of the address; A step of sequentially writing the read data of the color image in an access unit; and a step of sequentially performing the rotation reading and the writing to make four readings of the color image as one processing unit. Performing a data writing process; 5. The image rotation processing method according to claim 4, wherein the storage step has three blocks, and the three blocks are configured separately into one square portion and two rectangular portions. Image rotation processing method. 6. The image rotation processing method according to claim 5, wherein the size M × M of the square portion is determined by aligning two sides in a direction in which the document is not rotated and a direction in which the document is rotated by 90 degrees. The two blocks of the rectangular part are the same size,
It has a size of M × N, and the size M × N is rotated by a memory size configuration in which two sides are aligned in a direction in which the document is not rotated and a direction in which the document is rotated by 90 degrees so that the document does not overlap. An image rotation processing method comprising performing processing.