JPH11289462A - Picture processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the waiting time of a processing and to realize a high speed parallel processing by installing decoding means for the respective color components of an original picture. SOLUTION: An original picture constituted of a plurality of components is divided into a plurality of blocks and a parallel processing is executed for the respective components of respective blocks by using a plurality of decoding devices 13-15 and a plurality of header reading parts 12. The header reading parts read headers added for the respective blocks. When picture data of the whole blocks of the respective color components are decoded, the picture is outputted to the output device 16 of a display and the like. Since the processings are executed in parallel for the respective components of the respective blocks by using a plurality of decoding devices 13-15, a decoding processing can be executed at high speed. The number of the decoding devices 13-15 is set to be n-times as much as the number of components and n-pieces of header reading parts 12 are used. Thus, the highly efficient processing can be executed without vacant processing time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an image processing apparatus for performing parallel expansion processing on each color component of encoded image data.

[0002]

2. Description of the Related Art As a compression / decompression method of image data, a JPEG method which is an international standard is known.
For example, in the method of decompressing still image data described in Japanese Patent Application Laid-Open No. Hei 7-135652, by providing two buffers, decoding / inverse quantization operation and inverse DCT
The calculation is executed simultaneously to increase the processing speed.

[0003]

In the above-described conventional decoding technique, a single decoding device decodes a plurality of components, so that it takes time to process one image. That is, a case where an original image composed of three components R, G, and B as shown in FIG. 5 is divided into four blocks as shown in FIG. 6 and encoded image data (FIG. 7) is decoded. think of.

In FIG. 7, the header H0 has R0, G
A mode such as a quantization level when 0 and B0 are encoded is described. Similarly, headers H1, H2, and H3 respectively have (R1, G1, B1) and (R2, G2, B
2), a mode when (R3, G3, B3) is encoded is described.

FIG. 8 shows a configuration of a conventional image processing apparatus. The image processing device 31 includes one header reading unit 3
2 and one decoding device 33. When the image data of FIG. 7 is decoded by such an image processing device 31, a processing time as shown in a time chart of FIG. 9 is required. That is, the header reading unit 32 first reads the header H0, and the decoding device 33 decodes the block R0, then G0 and B0, and then decodes the same. In general, the times H0, H1, H2, and H3 required for reading the header are the times R0, G0, B0, R1, G1, B1, R2, and R3 for decoding the encoded data.
Very short compared to G2, B2, R3, G3, B3.

As shown in FIG. 10, when the image processing device 41 is composed of one header reading section 42 and two decoding devices 43 and 44, as shown in FIG. 8, the processing time can be reduced as compared with the case where the processing is performed by one decoding apparatus in FIG. However, there is a problem that a vacancy (vacancy 0, vacancy 1, vacancy 2, vacancy 3) occurs in the processing time of the decoding device 44, and high-speed and efficient processing is hindered.

An object of the present invention is to provide an image processing apparatus capable of performing high-speed parallel processing by eliminating a processing wait time by efficiently using a plurality of decoding devices and a plurality of header reading units. .

[0008]

According to a first aspect of the present invention, there is provided an image processing apparatus comprising means for decoding an encoded original image, the image processing apparatus comprising: A decoding means is provided for each color component.

According to a second aspect of the present invention, there is provided an image processing apparatus comprising means for decoding an encoded original image,
Means for reading a header added to each of a plurality of blocks corresponding to each color component when the original image is divided into a plurality of blocks for each color component and encoded, and for each block corresponding to each color component, A plurality of decoding means for decoding in parallel are provided.

[0010] The invention according to claim 3 is characterized by comprising n pieces of the header reading means provided in parallel with each other and (n × the number of components) the decoding means provided in parallel with each other.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be specifically described below with reference to the drawings. According to the present invention, an original image composed of a plurality of components is divided into a plurality of blocks, and parallel processing is performed for each component of each block using a plurality of decoding devices and a plurality of header reading units. By using n times (n is an integer) decoding devices and n header reading units in the processing, the waiting time of the processing of each decoding device is eliminated,
Performs highly efficient decoding.

<Embodiment 1> This embodiment is an embodiment in the case of n = 1, and FIG. When an original image including three components R, G, and B as shown in FIG. 5 is divided into four blocks and decoded as shown in FIG. 6, the image processing apparatus 11 of the present embodiment includes one (N =
1) header reading unit 12 and three (1 * 3 = 3)
, And decodes image data. FIG. 2 is an operation explanatory diagram of the first embodiment.

The image processing apparatus 11 receives encoded image data read out via a transmission path or from storage means. The header reading unit 12 reads a header added to each of a plurality of blocks. First, after the header H0 is read, the decoding device 13 processes the image block R0, the decoding device 14 processes the image block G0, and the decoding device 15 processes the image block B0 in parallel. Hereinafter, (R1, G1, B1), (R
2, G2, B2) and (R3, G3, B3) are processed in parallel. When all four blocks of image data of each color component are decoded, the image is output to an output device 16 such as a display. Thus, in this embodiment,
The processing time is half that of the processing time of FIG. 11, and there is no space in the processing time, and the decoding process can be performed with high efficiency.

<Embodiment 2> FIG. 3 shows the structure of Embodiment 2 and is an embodiment in the case where n = 2. 3 as shown in FIG.
An original image composed of three components R, G, and B is shown in FIG.
When decoding is performed by dividing into four blocks as shown in FIG. 3, six (2 * 3 = 6) decoding devices 24 to 24 are used as shown in FIG.
29 and two (n = 2) header reading units 22 and 23
Performs decryption processing. FIG. 4 is an operation explanatory diagram of the second embodiment. Headers H0 and H1 are read in parallel by header reading units 22 and 23, respectively.
0, G0, B0 and R1, G1, B1 are decoded in parallel by decoding devices 24-26, 27-29, respectively. The same applies to the processing after the headers H2 and H3, and the decompressed image is output to the output device 20. in this way,
In this embodiment, the processing time is reduced to half that of the first embodiment, and the decoding process can be performed more efficiently.

In the above embodiment, the original image is RGB.
Although the description has been made of the case of components, the present invention is not limited to the above-described embodiment, and other color systems, for example, YCr
It can also be applied to Cb and the like.

[0016]

As described above, according to the present invention, a plurality of decoding means are used in parallel for each component of each block, so that the decoding process can be executed at high speed. Can be. Further, by setting the number of decoding means to be n times the number of components and using n header reading means, it is possible to perform high-efficiency processing with no vacant processing time.

[Brief description of the drawings]

FIG. 1 shows a configuration of a first exemplary embodiment of the present invention.

FIG. 2 is an operation explanatory diagram of the first embodiment.

FIG. 3 shows a configuration of a second exemplary embodiment of the present invention.

FIG. 4 is an operation explanatory diagram of the second embodiment.

FIG. 5 shows an original image composed of R, G, and B components.

FIG. 6 is a diagram in which an original image is divided into blocks.

FIG. 7 shows encoded data.

FIG. 8 shows a configuration of a conventional image processing apparatus.

FIG. 9 is an operation explanatory diagram of FIG. 8;

FIG. 10 shows another configuration of a conventional image processing apparatus.

FIG. 11 is an operation explanatory diagram of FIG. 10;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Image processing device 12 Header reading part 13, 14, 15 Decoding device 16 Output device

Claims (3)

[Claims] 1. An image processing apparatus comprising means for decoding an encoded original image, wherein decoding means is provided for each color component of the original image. 2. An image processing apparatus comprising: means for decoding an encoded original image, wherein the original image is divided into a plurality of blocks for each color component, and when each of the color components is encoded, An image processing apparatus comprising: means for reading a header added to each of a plurality of corresponding blocks; and a plurality of decoding means for decoding each block corresponding to each color component in parallel. 3. The image processing apparatus according to claim 2, further comprising: n header reading units provided in parallel, and (n × the number of components) decoding units provided in parallel. apparatus.