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Inframe prediction method used for video frequency coding

A video coding and intra-frame prediction technology, applied in the field of video coding systems, can solve problems such as high algorithm complexity and insufficient prediction accuracy

Inactive Publication Date: 2004-10-06
BEIJING UNIV OF TECH
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Problems solved by technology

[0032] The prediction structure of JVT is very fine, but its prediction accuracy in DC prediction mode is not high enough, and it has more prediction modes for samples, such as its prediction of luminance samples in 4×4 blocks, 4×8 blocks, There are 9 prediction modes for 8×4 blocks and 8×8 blocks, which leads to a high complexity of the entire algorithm

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  • Inframe prediction method used for video frequency coding
  • Inframe prediction method used for video frequency coding
  • Inframe prediction method used for video frequency coding

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Embodiment Construction

[0134] According to the technical scheme of the present invention, according to figure 1 , Figure 6 As shown, the original video sequence is obtained through the video camera as input, and the video data stream enters the computer through the video capture card, and the video coding technology provided by JVT is used to make the brightness samples of the image in the sequence based on 8×8 blocks The intra prediction of , the specific steps are as follows:

[0135] 1. Read an image in the sequence;

[0136] 2. Divide the image into macroblocks with a size of 16×16;

[0137] 3. Take a 16×16 macroblock as the current prediction macroblock;

[0138] 4. Divide the macroblock into 8×8 blocks from left to right and from top to bottom;

[0139] 5. Take an 8×8 block as the current block;

[0140] 6. Predict the pixel brightness sample value of the current block 8×8 block;

[0141] The positions of the encoded pixel luminance samples around the current 8×8 block are as follows: ...

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Abstract

An in-frame predication method for video encode in order to improve video encode quality is disclosed. The original video stream taken by camera is used as input, which is input to computer by video acquisition card, and then processed by computer and the JVT video encode technique. An operation rule for calculating the DC predication mode by use of the samples of the decoded pixel in adjacent blocks is defined. Multiple predication modes can be recombined and sorted.

Description

technical field [0001] The invention relates to the technical field of computer digital video coding, and is aimed at a video coding system. The specific content of research and invention is intra-frame prediction technology. Background technique [0002] In order to transmit and store images in the current limited transmission bandwidth and storage media, we must compress and encode images. In the compression coding technology of dynamic images, the coding algorithm is divided into two cases: intra-frame coding and inter-frame coding. Among them, the first image in the video sequence or the first image after scene transformation is adopted for intra-frame transform coding, and the other images are inter-frame coded. In the prior art, intra coding uses spatial prediction to exploit the spatial statistical correlation in the source signal, and inter coding uses block-based inter prediction to exploit temporal statistical correlation. In the specific encoding, the predictio...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/61
Inventor 孔德慧张楠尹宝才王雁来孙艳丰岳文颖
Owner BEIJING UNIV OF TECH
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