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Wavelet transform based extreme-low bit-rate video compressing and coding method

A video compression and wavelet transform technology, applied in television, electrical components, image communication, etc.

Inactive Publication Date: 2013-04-03
BEIHANG UNIV
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Problems solved by technology

(Wang Daming, Huang Huiqun, Guo Jianxin. Research on PB frame technology in very low-speed video coding. Signal Processing, Vol.19, No.3, 2003.) But it still retains the traditional DCT transformation for inter-frame coding and inter-frame predictive coding way, so there are still traces of blocks at very low bitrates

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  • Wavelet transform based extreme-low bit-rate video compressing and coding method
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  • Wavelet transform based extreme-low bit-rate video compressing and coding method

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Embodiment Construction

[0106] implemented as figure 1 , figure 2 , image 3 , with 16 frames as a GOF, 352×288 CIF as the test image, and the frame rate as 10fps, which is suitable for very low bit rate transmission requirements. The time dimension is decomposed by Haar wavelet, and the space is decomposed by db9 / 7 biorthogonal wavelet.

[0107] Specific steps are as follows:

[0108] Step 1: First, 3D-DWT the image. Specifically, first use the Haar wavelet base to decompose the three-level wavelet in the time direction, and then use the Daubechies9 / 7 wavelet to decompose the decomposed time sub-bands into a three-level space. The obtained LLL3 size is 44×36×2, and then the lowest Frequency LLL3 is subjected to one-level virtual decomposition, and the size of LLLA after virtual decomposition is 22×18×1.

[0109] Step 2: Secondly, the decomposed coefficients are divided into blocks, and a 2×2 coefficient block is used as a node, and the subsequent diversity is consistent with the traditional SP...

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Abstract

The invention discloses a wavelet transform based extreme-low bit-rate video compressing and coding method. The wavelet transform based extreme-low bit-rate video compressing and coding method includes three steps: (1) subjecting a GOF (group of frame) image group to three-dimensional wavelet decomposition, selecting appropriate decomposition grades for time decomposition and space decomposition according to the size of the image group and formats including CIF (common intermediate format), QCIF (quarter common intermediate format), SIF (standard intermediate format) of videos, decomposing to obtain a coefficient matrix of wavelet decomposition; (2) subjecting the coefficient matrix to branching and blocking operation: firstly subjecting the coefficient matrix to first-grade virtual decomposition or second-grade virtual decomposition, and then blocking the coefficients after virtual decomposition; (3) realizing SPIHT (set partitioning in hierarchical tree) coding process. By the aid of the wavelet transform based extreme-low bit-rate video compressing and coding method, a conventional video wavelet 3D-SPIHT (three-dimensional set partitioning in hierarchical tree) algorithm is improved, a wavelet transformation coefficient is organized in a form of combining a virtual tree with a coefficient branching organization, a multi-threshold sub-band coding optimization method is utilized, important coefficient is coded preferentially, the purpose for displaying more effect information with few bit numbers is achieved, compression ratio can be improved, and compression efficiency is increased.

Description

technical field [0001] The present invention relates to an information source compression encoding method in the field of wireless communication, and mainly relates to an extremely low bit rate video compression encoding method based on wavelet transform, which is mainly suitable for extremely low bit rate video compression encoding in a satellite anti-jamming environment. The invention relates to effective transmission of high-rate video information, and belongs to the technical field of wireless communication. Background technique [0002] There are various interferences and noises in the wireless channel, and the satellite channel environment is even worse, which has a great impact on the video signal, and the video signal transmission in the wireless channel requires a coding scheme with a high compression ratio. How to use the wireless channel to transmit video Signal becomes the focus of people's research. In the satellite communication system, in order to deal with e...

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Application Information

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IPC IPC(8): H04N7/26H04N7/50
Inventor 修春娣袁延荣何宇刘建伟
Owner BEIHANG UNIV
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