JPH04148292A - Picture input circuit - Google Patents

Abstract

PURPOSE:To unnecessiate an image rotation process after finishing scanning, and to improve the throughout of a device by rotating an image at the same time of the scanning of a slip, and storing as an erect image on a page buffer memory part at the point of time when finishing scanning. CONSTITUTION:When scanning the slip rotated at 90 degrees in a clock direction in a photoelectric converting part 1, the picture element information is temporarily stored successively from an original point to an X direction in a line buffer memory part 2. And the n-number of picture elements are read out successively of the picture element information of an X maximum value and a Y minimum value to the X maxi mum value and a Y maximum value, and stored in one address of the original point of a page buffer memory part 4. Next, the n-number of picture elements are read out successively of the picture element information of the (X maximum value-1) and the Y minimum value of the memory part 2 to the X maximum value -1 and the Y maximum value, and stored in the memory part 4 to move at one address from the origin in a Y direction. Here, if the Y maximum value of the memory part 4 is defined as the maximum picture element number of the main scanning, by repeating the operation, it is possible to store as the erect image in the memory part 4. Thus, the rotation process time after finishing scanning is eliminated, and the process speed is improved.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an image input circuit having a function of scanning and inputting an image and storing a form, etc. rotated 90” left and right as an erect image. 6 [Prior Art] Conventionally, this type of image input circuit stores pixel information of a document to be scanned in a page buffer memory in the order of output from a photoelectric conversion unit.Therefore, when the document is rotated and scanned, The pixel information stored in the page buffer memory is also in a rotated form.

For this reason, when an erect image is required, pixel information is read out from the page buffer memory after scanning and processing is performed to rotate the image.

[Problem to be solved by the invention]

In the conventional image input circuit described above, when a form, etc. that has been rotated from side to side is scanned and input, and an erect image is required, rotation processing time is always required to rotate the image after scanning is completed. There are drawbacks.

Therefore, in order to solve the above-mentioned drawbacks, the present invention aims to improve processing speed by rotating the input image at the same time as scanning and storing it in the page buffer memory as an erect image at the end of scanning, thereby eliminating the rotation processing time after the end of scanning. The present invention provides an image input circuit with the following functions.

[Means to solve the problem]

The image input circuit of the present invention includes a line buffer memory that temporarily stores pixel information output from a photoelectric conversion section, a page buffer memory that reads and stores pixel information from this line buffer memory, and a page buffer memory that stores pixel information that is read from the line buffer memory. and a control unit that causes the page buffer memory to store pixel information in a state in which the pixel information is rotated by 90 degrees to the left or right.

The image input circuit of the present invention includes a photoelectric conversion section that obtains pixel information by scanning an object with main scanning and sub-scanning of m pixels, and a photoelectric conversion section that obtains pixel information by main scanning of the photoelectric conversion section. X that stores image information sequentially from the origin side in the X address direction and sequentially increases the X address according to the sub-scanning of the photoelectric conversion section to store image information output from the photoelectric conversion section.
A line buffer memory having n addresses; a page buffer memory for reading and storing pixel information from the line buffer memory; When storing information in the buffer memory, read n pixels of information from the origin side of the X address of the run-in buffer memory to the maximum value side and store it in 1 of the page buffer memory.
The X address of the line buffer memory is sequentially decreased by m addresses from the maximum value side to the origin side, and at the same time the X address of the page buffer memory is sequentially increased and stored in the line buffer memory. When all pixel information is compared and stored in the page buffer memory, the operation of sequentially increasing the X address of the page buffer memory is repeated, and the pixel information read from the line buffer memory is moved 90 degrees to the right. When storing the rotated state in the page buffer memory, the line buffer reads n pixels of information from the maximum value side of the X address of the line buffer memory to the origin side and stores it in one address of the page buffer memory. The X address of the memory is sequentially increased by m addresses from the origin side to the maximum value side, and at the same time the X address of the page buffer memory is sequentially increased, all pixel information stored in the line buffer memory is read out, and the page buffer memory is read out. and a control section that repeats the operation of sequentially decreasing the X address of the page buffer memory when the X address is stored in the page buffer memory.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

The binarized pixel information output from the photoelectric conversion unit 1 is
- is first stored in the line buffer memory section 2, then read out and sent to the page buffer memory section 4. The line buffer memory section 2 is controlled by a line buffer memory control section 3. The page buffer memory section 4 is controlled by a page buffer memory control section 5.

The control units 3 and 5 control the read address of the line buffer memory unit 2 and the write address of the page buffer memory unit 4 that stores the read pixel information, thereby scanning the pixel information pressed by the photoelectric conversion unit l. At the same time, the erected image is rotated and stored in the page buffer memory section 4.

FIGS. 4(a) to 4(c) show image rotation according to this embodiment.

The upper side of each of FIGS. 4(a) to 4(c) shows the scanning direction and the image to be scanned by the photoelectric conversion unit 1, and the lower side shows the image stored in the page buffer memory unit 4. Figure 4 (a
) is a case where the image to be scanned by the photoelectric conversion unit 1 is erect, and is stored in the page buffer memory unit 4 by a normal method. FIGS. 4(b) and 4(c) show cases in which the scanning target of the photoelectric conversion unit 1 is rotated 90° clockwise and 90° counterclockwise, and the page buffer memory is 4 is stored as an erect image.

First, a case will be described in which the photoelectric conversion section 1 scans a form rotated 90 degrees clockwise as shown in FIG. 5(a). At this time, the pixel information output from the photoelectric conversion section 1 is temporarily stored in the line buffer memory section 2 in order from the origin in the X direction as shown in FIG. 5(b). If the maximum value of X is the maximum number of pixels in main scanning, then Y is the number of pixels in sub-scanning. Here, the number of sub-scan lines stored in the line buffer memory section 2 is assumed to be n.

Further, n also corresponds to the number of pixels stored in one address space of the page buffer memory section 4.

FIG. 5(C) shows the reading direction of the pixel information once stored in the line buffer memory section 2, and as shown in the figure, the pixel information of the X maximum value and the X minimum value are sequentially read. When 6n pixels have been read out up to the maximum value, they are stored in one address at the origin of the page buffer memory section 4, as shown in FIG. 5(d). Next, n pixels of pixel information of the line buffer memory unit 2 are read out in order from the maximum X value -1 and the minimum X value to the maximum X value -1 and the maximum X value,
In the page buffer memory section 4, the data is moved by one address in the X direction from the origin and stored. Assuming that the maximum value of Y in the page buffer memory section 4 is the maximum number of pixels in main scanning, an erect image can be stored in the page buffer memory section 4 by repeating the above operation.

Next, FIG. 6(a) shows scanning by the photoelectric conversion unit 1 of a form rotated 90 degrees counterclockwise. 90° clockwise
As in the case of rotation, the data is stored in the line buffer memory section 2 as shown in FIG. 6(b). Pixel information is read from the line buffer memory section 2 at the minimum X value as shown in FIG. 6(C).

N pixels are read out in order from the maximum X value to the minimum X value and then to the minimum X value, and stored in one address of the page buffer memory section 4 between the maximum X value and the minimum X value, as shown in FIG. 6(d).

Next, the X minimum value of line buffer memory section 2 +1. From the maximum value of X to the minimum value of X +1. Read n pixels up to the minimum Y value,
In the page buffer memory section 4, the data is moved by one address in the X direction and stored at the maximum X value and the minimum Y value +1. By repeating the above operations, it is possible to store the image in the page buffer memory unit 4 as an erect image.

Further, the line buffer memory section 2 has a double buffer configuration; one side performs a write operation while the other performs a read operation, and the operation of each line buffer is switched each time the write operation is completed.

Thereby, it is possible to rotate the information in synchronization with the output of one pixel information and store it in the page buffer memory section 4 without stopping the output from the photoelectric conversion section 1.

The line buffer memory section 2 and line buffer memory control section 5 will be described in detail with reference to FIG.

Line buffer memory section 2 is line buffer memory A2
-1 and line buffer memory B2-2,
In each case, the writing operation and the reading pressure operation are repeated alternately. Further, while the line buffer A2-1 is in the write operation, the line buffer B2-2 performs the read operation. This switching of operations is performed by the line buffer switching circuit 3-6. The line buffer switching circuit 3-6 counts the number of main scanning lines and switches the address selector A3-5 and address selector B5-4 to address selector A3-5 and address selector B5-4 in order to switch the operation of each line buffer memory every n number of scans. issue,
Outputs memory control signals such as R/W and write timing.

Address selector A3-5 is line buffer memo')
The loading address and the read address output to A2-1 are switched by a switching signal from the line buffer switching circuit 3-6. Similarly, address selector B5-4 switches the address output to line buffer memory 2-2. Both line buffer memories A2-1. B2-2
The write address of 2 is read by the write address counter 3-1. The counter 20 is used to read the write address based on the concept described above.As shown in Figure 5(b), if X of the line buffer memory is the number of pixels in the main scanning direction, then Y is the number of pixels in the main scanning direction. . As a result, line buffer memory A2-1. The write address of line buffer memory B2-2 is represented by an X-direction counter and an X-direction counter.

Therefore, the light 7F less counter 3-1 has a photoelectric conversion unit l.
An X-direction counter that counts up for each pixel information output from the
Consists of a direction counter.

Next, line buffer memory A2-1. The read address of line buffer memory B2-2 will be described.

The read address of the line buffer memory is determined by the preset circuit 3-3 and the read address counter 3-2. The read address when rotated 90° clockwise as shown in FIG. 5(c) is determined by the X-direction counter and the X-direction counter. The X-direction counter is preset by the preset circuit 3-3 to the number of pixels in the main scanning direction minus 1, and then counts down every n pixels. on the other hand,
The X-direction counter counts up in synchronization with the pixel information output from the photoelectric conversion section 1. This counter repeatedly counts up from 0 to n-1. As a result, the read address shown in the above concept is changed.

On the other hand, the read address when rotated 90' counterclockwise as shown in FIG. 6(c) is determined by the X-direction counter and the X-direction counter in the same way as when the address is rotated 90'' clockwise. The direction counter counts up every n pixels from 0, and the X direction counter counts up from 0 to
3, the value of n-1 is set, and the countdown operation from n-1 to 0 is repeated in synchronization with the output timing of pixel information. This causes the read address to be changed.

Therefore, the read address counter 3-2 is composed of a 7-up down counter in the X direction and a 7 up down counter in the X direction. Returning the explanation to Figure 1.

The pixel information once stored in the line buffer memory section 2 is transferred to the repage buffer memory section 4, which is read out based on the readout address determined by the line buffer memory control section 3, as shown in FIGS. 5(d) and 6. The image is stored as an erect image as shown in (d). This page buffer memory section 4 is controlled by a page buffer memory control section 5.

The page buffer memory control section 5 will be explained using FIG. 3. The address of the page buffer memory section 4 is expressed by an X-direction counter and an X-direction counter like the address of the line buffer memory section 2. If the X direction is the main scanning direction and the The value is the number of pixels in the main scanning direction, and the maximum value of X is expressed by Equation 1.

The write address when rotated 90° clockwise as shown in FIG. 5(d) is changed by the preset circuit 5-4 and the write address counter 5-3.

The write address counter 5-3 is composed of an X-direction counter and an X-direction counter.
The X-direction counter is counted up from 0 for every n pixels output from . Further, the X-direction counter counts up from 0 every time a carry occurs in the X-direction counter. In this way, the fifth cow was grown at the address counter 5-3.
The write address shown in FIG. 3(d) is sent to the page buffer memory section 4 through the address selector 5-1 shown in FIG.

Similarly, when the write address is rotated 90° counterclockwise as shown in FIG. 6(d), the preset circuit 5-4 sets the maximum value of Then, the X direction counter is counted up from 0 every n pixels output from the line buffer memory unit 2. Further, the X-direction counter counts down from the set value every time a carry occurs in the X-direction counter. In this way, the write address shown in FIG. 6(d) is changed.

Is the read address counter 5-2 a counter that shifts the read address of the page buffer memory section 4?
Since it is no different from an address counter that controls normal memory, its explanation will be omitted.

〔Effect of the invention〕

As explained above, in the present invention, by rotating the image at the same time as the document is scanned, it is possible to store the image as an erect image on the page buffer memory section at the end of scanning. This eliminates the need for image rotation processing after scanning is completed, thereby improving the throughput of an apparatus that scans rotated forms and processes images.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram of the line buffer memory control section 3 of FIG.
3 is a block diagram of the page buffer memory control unit 5 of FIG. 1, FIG. 4 is a diagram showing image rotation according to this embodiment,
FIGS. 5(a) to 5(d) are diagrams illustrating image input according to this embodiment of a form rotated 90 degrees clockwise, and are diagrams showing a form scanned by the photoelectric conversion unit l and a line buffer memory unit, respectively. 2, line buffer memory section 2
FIGS. 6(a) to 6(d) illustrate image input according to this embodiment of a form rotated 90 degrees counterclockwise; FIGS. These diagrams each show a form scanned by the photoelectric conversion unit 1, a diagram showing storage in the line buffer memory unit 2, a diagram showing reading from the line buffer memory unit 2, and a diagram showing storage in the page buffer memory unit 4. It is. In the figure, ■ is a photoelectric conversion unit, 2 is a line buffer memory unit, 3 is a line buffer memory control unit, 4 is a page buffer memory unit, 512 page buffer memory control units,
2-1.2-2 is a line buffer memory, 3-1 is a write address counter, 3-2 is a read address counter, 3-3 is a preset circuit for presetting the read address counter 3-2, 3-4. 3-5 is an address selector, 3-6 is a line buffer switching circuit, 5-1 is an address selector, 5-2 is a read address counter,
5-3 is a write address counter, and 5-4 is a preset circuit for the write address counter 5-3. Agent Patent Attorney Uchihara Shinnzu No. Hitsuzudo-L Chibo θ (α) ) in five directions (b) (dr I times ((L) Obi times

Claims (1)

[Claims] 1. A line buffer memory that temporarily stores pixel information output from the photoelectric conversion unit, a page buffer memory that reads and stores pixel information from this line buffer memory, and a page buffer memory that stores pixel information that is read from the line buffer memory. An image input circuit comprising: a control unit that causes pixel information to be stored in the page buffer memory in a state in which pixel information is rotated by 90 degrees to the left or right. 2. A photoelectric conversion unit that obtains pixel information by performing main scanning and sub-scanning with m pixels on the target object, and a photoelectric conversion unit that obtains pixel information by main scanning of the photoelectric conversion unit, and converts the information of m pixels by the main scanning of this photoelectric conversion unit to the origin side in the X address direction. a line buffer memory in which the number of Y addresses is n and stores image information sequentially from the photoelectric converter, sequentially increasing Y addresses according to the sub-scanning of the photoelectric converter, and output from the photoelectric converter; A page buffer memory that reads and stores pixel information from the memory, and a Y of the run-in buffer memory when pixel information read from the line buffer memory is rotated 90 degrees to the left and stored in the page buffer memory.
If the X address of the line buffer memory is sequentially decreased by m addresses from the maximum value side to the origin side, the information of n pixels is read out from the origin side of the address to the maximum value side and stored in one address of the page buffer memory. At the same time, the Y address of the page buffer memory is sequentially increased, and when all the pixel information stored in the line buffer memory is read out and stored in the page buffer memory, the X address of the page buffer memory is sequentially increased. When the pixel information read from the line buffer memory is rotated 90 degrees to the right and stored in the page buffer memory, the pixel information is read out from the line buffer memory by n pixels from the maximum Y address side to the origin side. The information is read out and stored in one address of the page buffer memory by sequentially increasing the X address of the line buffer memory by m addresses from the origin side to the maximum value side and at the same time sequentially increasing the Y address of the page buffer memory. and a control unit that repeats an operation of sequentially decreasing the X address of the page buffer memory when all pixel information stored in the line buffer memory is read out and stored in the page buffer memory. image input circuit. 3. The line buffer memory consists of a first and a second run-in buffer memory, and when the first line buffer memory is writing pixel information from the photoelectric conversion section, the pixel information is written from the second line buffer memory. reading and writing into the page buffer memory; and reading pixel information from the first line buffer memory and writing into the page buffer memory while the second line buffer memory is writing pixel information from the photoelectric conversion unit. The image input circuit according to item 1 or 2.