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Video frequency compression encoding method for partitional arithmetics of three dimentional hierarchical tree sets

A technology of compression coding and set division, which is used in image coding, digital video signal modification, television and other directions

Inactive Publication Date: 2005-02-23
FUDAN UNIV
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Problems solved by technology

There is no essential difference between these two methods, and the transformation results are similar

Method used

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Embodiment Construction

[0061] The specific implementation is described below by taking the video stream of Salesman (352×288, 30 frames per second) in the common intermediate format CIF (Common Intermediate Format) as an example, and the entire implementation process is consistent with FIG. 1 . Codec takes 8 frames as one OFG or one RFG.

[0062] A: Video stream processing

[0063] Divide the input video stream into the form of 8 original frames (OFG) and 8 residual frames (RFG). If it is an odd multiple of 8 frames ((2n+1)*8), that is, it is transmitted as an original frame group, then go to B for processing. If it is an even multiple of 8 frames (2n*8), the last frame after decoding the 2nd (n-1) video frame group should be recovered as The reference frame is subtracted from each frame in the 2nth video frame group and the reference frame to obtain 8 consecutive processed residual frames as the residual frame group, and then go to B.

[0064] B: wavelet transform

[0065] Step 1. Spatial Domai...

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Abstract

The invention is a compression encoding method that is based on three dimension wavelet transform Shift-set partition in Hierarchical Trees based on time domain multi wavelet basis. It is improvement for video image three dimension wavelet transform compression encoding system. Considering real-time of video process, storage capacity of system, statistic characteristics of coefficient and Spiht encoding algorithm after wavelet transform, the invention introduces a method that is to further utilize time dependency of the video flow and to divide the video flow into OFG and RFG that is taken as encoding unit for processing. Meanwhile the time domain adopts the method combining Haar wavelet basis and Daubechies 9 / 7 wavelet basis.

Description

technical field [0001] The invention belongs to the technical field of video compression, and in particular relates to a three-dimensional hierarchical tree set partition (3D-DWT-SPIHT) video compression coding method. technical background [0002] Because wavelet transform overcomes the shortcomings of block effect and non-mosquito effect exposed by block transform coding in low bit rate environment, it has made great progress in image processing in recent years. Figure 2(a) shows a schematic diagram of two-dimensional first-order wavelet decomposition (four subbands: LL1, LH1, HL1, and HH1). LH1, HL1, and HH1 are the high-frequency parts of the first-order transformation, and LL1 is the first-order decomposition. the low frequency part. Figure 2(b) is a schematic diagram of two-dimensional three-level wavelet decomposition (10 subbands in total), which generates LL2, LH2, HL2 and HH2 by performing wavelet decomposition on LL1, and then performs wavelet decomposition on LL...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T9/00H04N19/63
Inventor 胡佳张立明胡波
Owner FUDAN UNIV
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