Method and device for video decoding

A video decoding and code stream technology, applied in the field of video decoding, can solve the problems of high decoder cost, high power consumption, high decoding complexity, etc., and achieve the effect of reducing decoding complexity

Active Publication Date: 2009-04-01
BEIJING ZHIGU TECH SERVICE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this process, due to the full-resolution decoding of the high-definition bit stream, the decoding complexity is high, the cost of the decoder is high, and the power consumption is large.

Method used

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  • Method and device for video decoding
  • Method and device for video decoding
  • Method and device for video decoding

Examples

Experimental program
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Embodiment 1

[0040] Figure 4 It is an exemplary flowchart of a video decoding method in Embodiment 1 of the present invention. Such as Figure 4 As shown, the process includes the following steps:

[0041] Step 401, when decoding the code stream to be decoded, decode the key image in it to obtain the reconstructed image of the key image; perform pixel sampling decoding on the non-key image according to the first preset sampling ratio to obtain the reconstructed image of the non-key image Reconstruct the image.

[0042] In this embodiment, when performing video decoding, key images and non-key images are identified from the code stream to be decoded according to a preset method. For example, the preset method may be: the I and P images are key images, and the B image is a non-key image, then the I, P images are recognized as key images, and the B image is a non-key image.

[0043] When decoding the key image, the key image may be decoded in full resolution, such as in accordance with t...

Embodiment 2

[0094] In this embodiment, the case where full-resolution decoding is used for key images, and horizontal and vertical sampling decoding is performed for non-key images according to a sampling ratio of 4:1 is taken as an example.

[0095] In this embodiment, it is assumed that the compressed code stream is: single-layer high-definition code stream MPEG2 MP@HL (1440×1152 50fps progressive), 8bit YCbCr 4:2:0; the display format is: standard definition television (SDTV) (720 ×57650fps progressive); GOP type: IBBP N=15, M=3; memory: SDRAM or DDR SDRAM.

[0096] Figure 7 It is a schematic flowchart of a video decoding method in Embodiment 2 of the present invention, as Figure 7 As shown, the process includes the following steps:

[0097] Step 701 , according to the standard decoding method, perform full-resolution decoding on key images (I and P images), and output a reconstructed image of the key image with a full resolution of 1440×1152.

[0098] Step 702: Perform pixel samp...

Embodiment approach 2

[0192] 3. Under scheme 2 of the present embodiment (using distorted sampling motion compensation):

[0193] Computational complexity:

[0194] IDCT: each 4×4 coefficient in 4 8×8 transform blocks, 4×4 space points (additional 48 accumulation operations);

[0195] MC: 8×8 pixels (pre-filtering is only for detail blocks);

[0196] Post-processing: 1 / 4 downsampling is not required.

[0197] In summary, the computational complexity of solution 2 in the embodiment of the present invention is about 25% of that of the standard decoding solution.

[0198] Storage access:

[0199] MC: according to the number of bytes: 8×8; according to the number of 32-bit words: 3×8=24;

[0200] Post-processing: read 1 / 4 resolution images.

[0201] In general, the storage access amount of solution 2 in the embodiment of the present invention is about 22% (by byte) or 28% (by 32-bit word) of the standard decoding solution.

[0202] Considering that the complexity of MC, IDCT, and post-processing ...

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Abstract

The invention discloses a video frequency decoding method comprising: identifying critical image and non-critical image from code stream to be decoded according to preset method; decoding the critical image, acquiring reconstruction image of critical image; according to first preset sampling fraction, decoding for pixel sampling for non-critical image, acquiring reconstruction image of non-critical image; according to display sequence, sequencing the reconstruction image of critical image and reconstruction image of the non-critical image, sampling processing for reconstruction image of the critical image according to display image resolution corresponding to display format. In addition, the invention also discloses a video frequency decoding device. The inventive technical scheme can reduce complexity of decoding.

Description

technical field [0001] The present invention relates to video decoding technology, in particular to a video decoding method and device. Background technique [0002] Video coding technology is to compress digital video information so that it can be transmitted and stored more effectively; video decoding technology is to analyze and reconstruct encoded video information to obtain video images. [0003] At present, video compression coding standards are mainly formulated by the Moving Picture Experts Group (MPEG), ITU-T SG16Q6 Video Coding Experts Group (VCEG) and the VCEG-MPEG Joint Expert Group (JVT). These standards include: H.263, MPEG2, MPEG4 -Part2 and the latest H.264 / AVC (MPEG4-Part10). Other video coding standards include VC-1 and the video coding standard AVS1.0-P2 formulated by the China Audio Video Standards Group (AVS). The above-mentioned video coding standards all adopt a hybrid coding architecture based on block-based motion compensation and transform coding,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/32H04N7/26H04N19/50
Inventor 孟新建
Owner BEIJING ZHIGU TECH SERVICE
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