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Grouping method in frequency domain distributed video coding

A distributed video, classification and combination technology, applied in the direction of digital video signal modification, TV, electrical components, etc., can solve problems such as difficult to complete complexity, high inter-frame prediction, etc., achieve low decoding cost, low power consumption, and avoid decoding The effect of quality loss

Inactive Publication Date: 2010-09-15
GUANGDONG XUNTONG TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. Due to the limited data processing capabilities, storage capabilities, and power consumption of terminal devices such as mobile phones and wireless PC cameras in wireless networks, it is difficult to complete complex coding techniques such as inter-frame prediction

Method used

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  • Grouping method in frequency domain distributed video coding
  • Grouping method in frequency domain distributed video coding
  • Grouping method in frequency domain distributed video coding

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Experimental program
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Embodiment Construction

[0042] Step 1: The even-numbered sequence of the input image video is regarded as W frame, and the odd-numbered frame is regarded as a key frame; the key frame is encoded by intra-frame coding in traditional video coding, and its decoding and reconstruction frame has two purposes, one is to restore the video stream, One is to use side information interpolation to estimate side information,

[0043] Step 2: For the W frame, first perform discrete cosine transform DCT, use the absolute value difference MAD criterion to judge the encoding mode of each macroblock of the W frame, and then perform preprocessing, and the encoding is in Skip mode, low-frequency mode or full-frequency mode kind of

[0044] Step 3: After the image macroblock is preprocessed, it is sequentially quantized and encoded by a Turbo encoder, and the encoded check digits are transmitted to the decoding end. The number of check digits transmitted to the decoding end depends on the accuracy of the side informatio...

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Abstract

The invention relates to a grouping method in frequency domain distributed video coding, which is improved aiming at a frequency domain Wyner-Ziv video coding scheme provided by a foreign research scholar, Stanford University Professor Bernd Girod, according to the characteristics of a wireless sensor network terminal device, such as low coding complexity, limited storage capacity and capability of transmitting in a network with poor channel quality and the like, and the Wyner-Ziv video coding characteristic. In the method, image frames are divided into three coding modes at a coding end, namely a skip mode, a low frequency mode and a full frequency mode; and combined decoding is performed by respectively selecting a side information estimation method for average interpolation, adaptive search motion estimation interpolation and adaptive search fine motion estimation interpolation according to a corresponding coding mode at a decoding end. The method can realize low bitrate transmission by eliminating a large number of interframe predictions and entropy coding, and also can acquire more accurate side information with low decoding price so as to effectively avoid the reduction of image decoding quality.

Description

technical field [0001] The invention relates to a video coding compression method, in particular to a frequency domain Wyner-Ziv video coding method. Background technique [0002] With the emergence of new technologies such as wireless multimedia communication and wireless video sensor network, a new video compression codec technology - Wyner-Ziv video coding has attracted widespread attention. It mainly satisfies the characteristics of some wireless terminal devices such as low coding complexity, limited storage capacity, and the ability to transmit in networks with poor channel quality. This method is different from the traditional video codec technology, and has the characteristics of simple encoding, complex decoding, high compression rate, and strong resistance to bit errors. However, the low compression ratio and low quality of reconstructed images are the problems faced by the current Wyner-Ziv video codec technology. The main reason is that the Wyner-Ziv video codi...

Claims

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Application Information

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IPC IPC(8): H04N7/26H04N7/50H04N19/533H04N19/625
Inventor 刘峰肖艳
Owner GUANGDONG XUNTONG TECH
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