JPS62266922A - Image information decoder - Google Patents

Abstract

PURPOSE:To reduce the time of decoding processing by dividing image information into plural small regions in advance and providing plural decoding means decoding separately a code of each small region so as to apply the decoding processing in parallel. CONSTITUTION:The image information is divided corresponding to small regions A, B and stored in a compression data file 12 while being coded. The code is read from the region A or B from the file 12 and decoded by a decoder 9 or 10 via a data bus 11. In completing the decoding of the decoder 9 and receiving interruption, the image data of the region A is expanded on image memory 5, the expansion processing of the decoder 10 is checked and when not finished, the image data of the region B is expanded on the memory 5 to complete the processing. When the decoding end interruption of the decoder 10 exists, the image data of the region B is expanded on the memory 5 and the expanding processing of the decoder 9 is checked. When not finished, the image data of the memory A is expanded and synthesized on the memory 5 and the processing is finished.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a decoding device for decoding image information.

[Conventional technology]

In conventional image information decoding devices, a single decoder is used to decode the image information to be decoded.

[Problem that the invention seeks to solve]

The conventional image information decoding device described above has a problem in that there is a limit to the speed of decoding because one decoder is used to perform decoding.

[Means for solving problems]

In order to solve such problems, the present invention divides the image information to be decoded into a plurality of small regions in advance, and when decoding the code encoded for each small region, the plurality of The apparatus is provided with a plurality of decoding means for separately decoding the codes of the small regions, and a composition means for synthesizing original image information from the image information of the plurality of small regions decoded by the plurality of decoding means. This is how it was done.

[Effect]

In the present invention, decoding processing is performed in parallel, reducing decoding time.

〔Example〕

FIG. 1 shows an image information encoding/decoding apparatus l to which an embodiment of the image information decoding apparatus according to the present invention is applied. This device 1 uses two decoders, including an image information input device 2 such as a scanner, an image information output device 3 such as a printer, an image information display device 4 such as a display, an image memory 5 as a composition means, It is composed of an image data bus 6, encoders 7 and 8, decoders 9 and 10 as decoding means, a code data bus 11, a compressed data file device 12, and a control section 13.

FIG. 2 is an explanatory diagram showing the flow of data for decoding, and FIG. 3 is a flowchart for explaining the decoding process in the apparatus 1. As shown in FIG.

Next, the decoding part of the device 1 will be explained using FIGS. 1 to 3. The image data to be decoded is stored in advance in the image memory area 15 as a plurality of small areas.
and the image memory area 16. The code encoded for each small area is stored in the compressed data file device 12. Image memory area 1
A plurality of decoding means for separately decoding the codes of 5 and image memory area 16 can be obtained by providing two decoders 9 and 10.

As shown in step 21 in FIG. 3, the code in the image memory area 15 is read from the compressed data file device 12 and decoded by the decoder 9 via the code data bus 11. Regarding the code of the image memory area 16,
Similarly, read the decoder 1 as shown in step 22.
Perform decoding with 0.

Next, in step 23, the decoding end interrupt is waited for, and the decoder 9
If there is a decoding end interrupt, the process moves to step 24, and the image data in the image memory area 15 is expanded onto the image memory 5. In step 25, it is determined whether the expansion process in the other decoder 10 has been completed. to decide. If the process is not completed, the process returns to step 23 and the processing in the decoder 10, that is, the image data in the image memory area 16 is expanded onto the image memory 5. If the process is not completed, the process is completely terminated.

Next, in step 23, if there is a decoding end interrupt of the decoder 10, the process moves to step 26, and the image memory area 1
6 is expanded onto the image memory 5, and in step 27 it is determined whether the expansion process in the other decoder 9 has been completed. If not, the process returns to step 23 and the processing in the decoder 9, that is, the image data in the image memory area 15 is expanded onto the image memory 5, and if the process is to be completed, this expansion process is completely terminated.

In this way, combining the image information of multiple small areas decoded by multiple decoding means into the original image information is as follows:
It is obtained by expanding the image information in the image memory areas 15 and 16 decoded by the decoders 9 and 10 onto the image memory 5 and combining them.

FIG. 4 is an explanatory diagram for explaining the decoding processing time. In FIG. 4, arrows 31 and 32 indicate compressed data transfer from compressed data file device 12 to decoder 9 and compressed data transfer from compressed data file device 12 to decoder 10, and arrows 33 and 34 indicate compressed data transfer from compressed data file device 12 to decoder 9. and decoding processing in decoder 10, and arrows 35 and 36 indicate image data transfer from decoder 9 to image memory 5.

Compressed data transfer time 31.32, decoding process 33.3
4 and image data transfer 35.36, respectively, tl, tlo, t2, t20. t3. t3
0, and the decoding processing time when two decoders are used is T
1 and the decoding processing time when using only one decoder is T2, then T1=tl+t2+t3+t30...(11T2=
t 1 + t2 + t3 + t 10 + t20 + t30...
・(2) becomes. The data transfer time is much shorter than the decoding processing time (assuming that the decoding processing times in decoders 9 and 10 are almost equal, then T1 and T2/2... (3), and two decoders are used. The decoding processing time when using
Compared to the case where only one decoder is used, the speed is reduced to 1/2, and the speed can be increased. It is also clear that higher speeds can be achieved by using more decoders.

〔Effect of the invention〕

As explained above, the present invention divides image information to be decoded into a plurality of small regions in advance, and when decoding the codes encoded for each small region, the codes of the plurality of small regions are By providing a plurality of decoding means that perform decoding separately, the decoding process can be performed in parallel, which has the effect of shortening the time for the decoding process.

[Brief explanation of drawings]

FIG. 1 is an image information encoding/decoding device in which an embodiment of the image information decoding device according to the present invention is applied, and FIG. 2 is an explanatory diagram for explaining the decoding process in the device of FIG. 1. , FIG. 3 is a flowchart for explaining the decoding process, and FIG. 4 is an explanatory diagram for explaining the time of the decoding process. ■... Image information encoding/decoding device, 2... Image information input device, 3... Image information output device,
4... Image information display device, 5... Image memory, 6... Image data bus, 7, 8... Encoder, 9°lO... Decoder, 11... Code data bus, 12... Compressed data file device, 13... Control unit.

Claims (1)

[Claims] Multiple decoding in which the image information to be decoded is divided in advance into a plurality of small regions, and when decoding the code encoded in each of the small regions, the codes of the plurality of small regions are separately decoded. What is claimed is: 1. An image information decoding device comprising: means for combining original image information from image information of a plurality of small areas decoded by the plurality of decoding means.