JPS6145366A - Picture rotation and conversion device - Google Patents

Abstract

PURPOSE:To increase the processing speed for 90 deg. rotation/conversion of a rectangular partial picture by actuating in parallel a rotation/conversion circuit and a DMAC which controls the address and the block of the DMA transfer picture data. CONSTITUTION:A DMAC2 receives a start signal 9 from an upper device and then fetches the rectangular partial picture data from a picture information memory 1. The rotation/conversion start signal is sent to a rotation/conversion circuit 3 after the calculation is over with the start address, a shift control parameter and the number of (16X16)-dot blocks of a partial picture. Then the 90 deg. rotation/conversion of the partial picture is carried out. When a read/write request signal 8 is delivered from the circuit 3, the access processing for read/ write actions, the address control of the picture data and the (16X16)-dot block control are carried out at the memory 1. The circuit 3 receives a rotation/conversion start signal 6 and performs the 90 deg. rotation/conversion of the picture data.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an image rotation conversion device, and in particular to a rotation conversion device for image data.
The present invention relates to an image rotation conversion device that performs 0° rotation conversion and conversion in real time.

[Background of the invention]

Conventionally, when rotating an image, it is performed by performing a conversion process on the read address and write address for the image data in the memory so that the image is rotated (for example, as disclosed in Japanese Patent Laid-Open No. 53 (Refer to "Image conversion device" in Publication No. 3743). That's true.

However, rotational conversion of image data has the disadvantage that because data read/write operations are performed by byte processing, the range in which rotational conversion can be performed for image data in memory is limited by word boundaries. In addition, if the above disadvantages were eliminated, software processing such as register shift is performed, so as the image data to be rotated becomes larger, the processing time for rotation conversion becomes longer. .

[Purpose of the invention]

The purpose of the present invention is to eliminate such conventional drawbacks and to be able to convert 900 rotations of a rectangular partial image at high speed without imposing word boundary constraints on image data in memory. An object of the present invention is to provide an image rotation conversion device.

[Summary of the invention]

In order to achieve the above object, the image rotation conversion apparatus of the present invention is an apparatus for rotationally converting image data in a memory to the right or left 900.
(a multiple of n-16 1m≧1); a rotation conversion unit that reads/writes data to/from the storage unit using a serial signal and rotates image data by 90 degrees; and requirements for the rotation conversion circuit. Accordingly, the present invention is characterized by having a DMA means for rotationally converting all arbitrary rectangular partial images of the image data by performing DMA transfer of the image data to the memory.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an image rotation conversion device according to an embodiment of the present invention.
It's a ¥-sized block.

In FIG. 1, 1 is an image information storage memory, 2 is D
~I A C (Direot Memory A
cceas Controller), the convex part is a rotation conversion circuit, the bottom part is an address bus, 5 is a data bus, 6 is a rotation conversion activation signal, 7 is a shift control parameter, 8 is a read/write request signal, and 9 is a processing activation signal. be.

When the DMAC 2 receives the activation signal 9 from the host device, it takes in the rectangular partial image data from the image information storage memory 1, calculates the start address of the partial image, the shift control parameter, and the number of 16×16 dot blocks, and then converts the rotation conversion circuit. Send the rotation conversion start signal 6 to 90'
Perform rotation transformation. When the read/write request signal 8 is received from the rotation conversion circuit 3, read/write access processing 1 image data address management, 16×16 dot block management, etc. are performed between the i-image information storage memory 1. The image conversion circuit 3 receives the rotational conversion start signal 6 and performs 90' rotational conversion of the image data using the configuration shown in FIG.

In Figure 2, 10.12 is parallel → serial (P -) of transfer, original image data, and transfer last month's image data, respectively.
S) conversion buffer, 11.23 is a buffer for reading the transfer source image data and transfer destination old image data, respectively;
13.14 are counters for X and Y coordinates, 15
RAM for rotating 256 dots (16XL6 pits), 16t! A selector for selecting the transfer source image data or the transfer destination old image data, 17 is a buffer for serial → parallel (S-+P) conversion of the transfer destination new image data, 18 is a write buffer for the transfer destination new image data, 19% or A clock control unit, 20 is a transfer source image system block, 21G is a rotation conversion system block, and 22 is a transfer destination image system block.

Note that the transfer source image data, the transfer destination old image data, and the transfer destination new image data are all image data in the image information storage memory 1, and are respectively image data of an area to be rotated by 90 degrees, and 900 degrees. No rotation required, i.e.
Refers to image data of an area that can be converted into new data without changing its state, or newly created image data.

The above transfer source image data is sent from the image information storage memory 1 to the read buffer 23 through the 16-bit data I/O bus 5, and then the transfer source image system block 20 receives a command from the clock control unit 19 to output the −+S conversion is performed,
The data is sent to the RAM 15 through the P-+S converter 10. Furthermore, for the transfer source image data which is in a series, the rotation transformation system/block 21 is connected to the X coordinate counter 13.
and RAM15 while counting Y coordinate counter 1+.
3 (older sister). In that case, the X coordinate counter 13 is made to repeatedly count from 0 to 15 for the X direction address 25, and one Ym
Regarding the Y direction address 24, the m horse counter 14
When the count value of the X-coordinate counter 13 returns to NOIT, the write operation is incremented by 1'' and continues until both count values show 15'' (16×16-256 dots).

Also, read the transfer source image data from the RAM 15.

3(b), the Y-coordinate counter 14 repeatedly counts 0 to 15 for the Y-direction address 24, and the X-coordinate counter 13 repeatedly counts the X-direction address 25. N OIT), when the count value of the Y coordinate counter 14 returns to NOIT
By counting up IT, serial image data obtained by rotating the image data written above by 900 times is sent to the S→P conversion buffer through the selector 16. Further, the serial image data is subjected to S-+P conversion by the transfer destination image system block 22 according to a command from the clock control unit 190, and the write buffer 18. The data is sent to the image information storage memory 1 through the data bus 5, and becomes the new image data to be transferred. As above, both count values are “15”.
Sending continues until ''' is indicated.

Note that the above write/read operations are performed in synchronization with DMAC2. Further, the above is a case of 900 soft turns to the right, but when it is 90 degrees to the left, the initial value of the X-coordinate counter 13 in the read operation is set to "15" and counting is performed down.

On the other hand, the transfer destination old image data is sent from the image information storage memory 1 to the read buffer 11 through the 16-bit data path 5, and then transferred to the P- )S conversion and sent to the selector 16 through the P-+S conversion buffer 12. if,
If selected by the selector 16, it is sent to the same transfer destination image system storage memory 1 and becomes the transfer destination new image data. Receiving the parameter 7, the transfer source image system block 20. Rotation conversion system block 21. A shift command is sent to each of the transfer destination image system blocks 22, and a shift command is sent to the selector 1.
A switching signal is output to DMAC 6, and a read/write request signal 8 is output to DMAC 2 according to the shift status of each block.
to be sent back.

FIG. 4 is an operation flowchart of DMAC2, and the fifth
The figure is a diagram for explaining a 16×16 dot block management method by DMAC.

When the DMAC 2 receives the activation signal 9 from the host device (step 101), it first imports the information parameters of the rectangular partial image area from the image information storage memory 1 (step 102), and determines the direction of rotation conversion. 105), calculate the transfer source and transfer destination head addresses (step 106), and convert the rectangular partial image data into
For example, as shown in FIG. 5 (&), blocks are divided into 16×16 dots (step 107).

Furthermore, the calculated shift control parameter 7 is sent to the clock control unit 19Vc (steps 108, 109), and then the rotation conversion start signal 6 is sent (step 110).
, 90' rotation conversion processing in which the rotation conversion circuit 3 was also operated (FLEQ, SEL, JUMP routine shown in Fig. 4)
(step 111).

That is, upon receiving the read/write request/signal 8 from the clock control unit 19, first, the old image data at the destination is fetched by the destination image system block 22 by DMA transfer (step 113), and the new image data at the destination is transferred. (step 114).

Next, the transfer source image system block 20 imports the block ■ shown in FIG. 112 and 114 are repeated as blocks ■■...0, and the process ends when the last block is processed (steps 115, 117). Furthermore, when switching the next 16x16 dot unit block to be read or written, the starting address is determined based on the received read/write request compensation code 8 and the shift control parameter 7 calculated above. Lead in the block order shown in the figure ('b).
), so 9? is rotated 90 degrees to the right. In this way, by receiving the rotation conversion start signal 6 and the shift control parameter 7, the image data can be shifted while returning the read/write request compensation code 8, and the image can be created in units of 16x16 dot blocks. The rotation conversion circuit 3 performs rotation conversion, and the DMA data transfer operation is performed in real time for the returned read/write request code 8, and image data area address management 1 image data block management is also performed. Because it operates in parallel with DMAC2, which processes
0 Rotation conversion processing is possible.

〔Effect of the invention〕

As explained above, according to the present invention, image data is
Since the rotation conversion circuit that performs rotation conversion and the DMAC that performs DMA transfer, image data address, and block processing operate in parallel to process 90' rotation conversion, word boundary restrictions on image data within a mesh can be avoided. The 900-rotation transformation of a rectangular partial image can be sped up without giving

[Brief explanation of the drawing]

Fig. 1 is a 1772 diagram showing the configuration of an image rotation conversion device showing an embodiment of the present invention, Fig. 2 is a configuration diagram of an image conversion circuit, and Fig. 3 (&), (1)) is a rotation conversion diagram by the image conversion circuit. FIG. 4 is a diagram for explaining the operation, and FIG. 4 is a diagram for explaining the operation footyard of the DMAC, and FIGS. 5 (&) and (b) are diagrams for explaining block management by the DMAC. 1: Image information storage memory, 2; DMAC% 3: Rotation conversion circuit, 4 Near address bus, 5: Data bus, 6 Two rotation conversion start signal, 7: Shift # control parameter, 8: Read/write request signal, 9: Start signal, l O = 12
: P S conversion t< y y 7.11.23
: Read buffer, 13: X coordinate counter, 14:
Y coordinate counter, l5: RAM. 16: Selector, 17: S-P conversion buffer, 1
8 Buffer for co-light, 19: Clock control section, 20:
Transfer source image system block, 21: Rotation transformation system block, 2
2: Transfer destination image system block, 24: Y direction address, 2
5: X direction address. Agent: Patent Attorney Akio Takahashi
Figure 2 and Figure 3 (a)

Claims (1)

[Claims] In a device that rotates image data in memory 90 degrees to the right or left, n×m (n
= multiple of 16; , DM of image data to the above memory
An image rotation conversion device comprising DMA means for rotationally converting all arbitrary rectangular partial images of the image data by performing A transfer.