Low bit rate video encoding method and system based on conversion downsampling

A video coding and low bit rate technology, applied in the field of video coding and decoding, can solve the problems that there is no priority relationship between different frequency bands, and the coding effect is difficult to meet the needs of the industry, so as to achieve excellent coding effect and improve the effect of coding

Inactive Publication Date: 2015-03-25
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

However, this existing technology does not address the priority relationship between different frequency band divisions, and the coding effect in the case of low bit rate is difficult to meet the needs of the industry

Method used

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  • Low bit rate video encoding method and system based on conversion downsampling
  • Low bit rate video encoding method and system based on conversion downsampling
  • Low bit rate video encoding method and system based on conversion downsampling

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Embodiment 1

[0030] like figure 1 As shown, this embodiment includes the following steps:

[0031] 1. Downsampling of video signals

[0032] Since the code rate is limited in the low code rate channel, it is necessary to use the limited code rate to encode relatively important content. Down-sampling the video signal can obtain a low-frequency signal containing a large amount of video information, and encoding the down-sampled low-frequency signal can ensure that these important information are encoded under a given low bit rate. The specific coding framework process is as follows:

[0033] 1.1 Perform wavelet transformation on the input video signal in units of frames, and rearrange the transformed coefficients to obtain one low-frequency subband and three high-frequency subbands;

[0034] 1.2 Encoding a low-frequency subband using HEVC according to the method described in step 2 to obtain an output code stream;

[0035] 1.3 Encoding the three high-frequency subbands according to the m...

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Abstract

The invention discloses a low bit rate video encoding method and system based on conversion downsampling. The method comprises the steps that video signal downsampling is carried out, wherein two-dimensional conversion is utilized for downsampling, and low frequency coefficients and high frequency coefficients are encoded in different methods; low frequency coefficient hybrid encoding frame encoding is carried out, wherein the low frequency coefficients are mapped, rounded down and normalized, and then HEVC encoding is carried out on the low frequency coefficients; high frequency coefficient bit plane encoding and frame segmentation processing are carried out, wherein bit plane encoding scanning is utilized for obtaining the large coefficient in the high frequency coefficients, then frame segmentation processing is utilized for encoding the large coefficient with a macro block as a unit. The low and high frequency encoding rate distribution is effectively achieved through the energy relation. According to the low bit rate video encoding method and system based on conversion downsampling, the significance of low frequency coefficient encoding is ensured, and meanwhile by means of the influences of the large coefficient in the high frequency coefficients on video details, the encoding effect similar to the HEVC is achieved on encoding; in addition, due to downsampling introduction, the encoding resolution ratio is lowered, and the complexity of the whole encoding process is greatly lowered.

Description

technical field [0001] The present invention relates to a technology in the field of video encoding and decoding, specifically a method of downsampling by using transformation, combined with mixed frame encoding of low-frequency coefficients, bit-plane encoding of high-frequency coefficients, and frame segmentation processing to realize low-bit-rate channels Encoding method and system. Background technique [0002] Video coding and decoding technology is a signal coding technology that removes redundant information that may exist in time, space, coding and other links of video data through various technical means, and compresses the data volume to be much smaller than the original video data volume. Through video codec technology, video data can be stored, transmitted and related operations more effectively. The traditional video coding and decoding framework is a hybrid coding framework based on prediction (motion estimation), transformation and entropy coding. Up to now, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/63H04N19/625H04N19/86H04N19/132H04N19/117
Inventor 解蓉郑侃侃张良
Owner SHANGHAI JIAO TONG UNIV
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