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Video coding/decoding method and device

An encoding method and video technology, applied in the direction of digital video signal modification, television, electrical components, etc., to achieve the effect of eliminating encoding overhead and encoding delay

Active Publication Date: 2011-04-27
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem that the existing bidirectional predictive motion compensation method generates extra coding delay when predicting the current coded image block, and codes two hypothetical motion vectors separately to generate extra coding overhead, an embodiment of the present invention provides a Video encoding / decoding method and device

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  • Video coding/decoding method and device

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Embodiment 1

[0062] see figure 1 , is a flowchart of a video encoding method provided in this embodiment. The method includes:

[0063] 101: Search for an optimal hypothesis from a reference frame used for prediction;

[0064] 102: Search for a suboptimal hypothesis according to the optimal hypothesis;

[0065] 103: Search for the weight of the optimal hypothesis and the weight of the suboptimal hypothesis in a preset measurement method;

[0066] 104: Obtain a weighted and merged prediction image block according to the weight of the optimal hypothesis and the weight of the suboptimal hypothesis obtained through searching;

[0067] 105: Calculate the residual image block according to the weighted combined prediction image block;

[0068] 106: Transform, quantize, and encode the residual image block.

[0069] This embodiment performs motion compensation by searching two hypotheses in the unidirectional reference frame, searches for the suboptimal hypothesis with the optimal hypothesis, ...

Embodiment 2

[0071] In order to solve the problem that the existing bidirectional predictive motion compensation method generates extra coding delay when predicting the current coded image block, and codes two hypothetical motion vectors separately to generate extra coding overhead, this embodiment provides a video encoding method, such as figure 2 As shown, the method specifically includes:

[0072] 201: Search for the optimal hypothesis H from the reference frame used for prediction 1 ;

[0073] Among them, according to the current coded image block I, the optimal hypothesis H is searched in the reference frame for prediction with a preset measurement method 1 ;

[0074] In this example, if image 3 As shown, two reference frames for prediction are used as an example, but this does not limit the number of reference frames for prediction; the preset measurement methods can include MSE (Mean Square Error, mean square error or residual difference energy) criterion or SAD (Sum of Absol...

Embodiment 3

[0109] see Figure 4 , is a flowchart of a video decoding method provided in this embodiment. The method includes:

[0110] 301: Decode the motion information of the optimal hypothesis;

[0111] 302: Obtain an optimal hypothesis in the reference frame used for prediction according to the motion information of the optimal hypothesis;

[0112] 303: Decode the weight of the suboptimal hypothesis;

[0113] 304: When the weight of the suboptimal hypothesis is zero, calculate the weighted and merged predicted image block according to the weight of the optimal hypothesis, and perform 306;

[0114] 305: When the weight of the suboptimal hypothesis is not zero, search for the suboptimal hypothesis according to the optimal hypothesis, calculate the weight of the optimal hypothesis according to the weight of the suboptimal hypothesis, and calculate the weighted combination based on the weight of the optimal hypothesis and the weight of the suboptimal hypothesis Predict image blocks; ...

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Abstract

The invention discloses a video coding / decoding method and a device, belonging to the field of video image processing. The method comprises the following steps: searching optimal hypothesis from predictive reference frames; searching suboptimal hypothesis according to the optimal hypothesis; searching the weight of the optimal hypothesis and the weight of the suboptimal hypothesis in a preset measuring mode; acquiring weighed and combined predictive image blocks according to the weight of the optimal hypothesis and the weight of the suboptimal hypothesis obtained by searching; calculating residual image blocks according to the weighed and combined predictive image blocks; and carrying out conversion, quantification and coding on the residual image blocks. The invention also comprises a video coding device, a video decoding method and a device. The invention carries out motion compensation by searching two hypothesizes from one-way reference frames, can eliminate extra coding time delay caused by the coding sequence adjustment of the video frame in two-way predication compared with motion compensation of two-way predication, and eliminates coding overhead to the motion information of the suboptimal hypothesis by using optimal hypothesis to predict the suboptimal hypothesis.

Description

technical field [0001] The present invention relates to the field of video image processing, in particular to a video encoding / decoding method and device. Background technique [0002] With the development of multimedia technology, diversified video applications are widely popular in all aspects of production and life. Due to the large amount of data in video applications, including more redundant information, especially when video applications are gradually developing to high resolution and high frame rates, existing storage and transmission technologies cannot meet the needs of a large number of video applications. Therefore, efficient video compression coding technology becomes the key to the development of various video applications. [0003] At present, a video coding method based on a hybrid coding structure is adopted in various video coding standards, and the method usually uses four compression coding techniques of prediction, transformation, quantization and infor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/26H04N7/50H04N19/61
Inventor 季向阳魏宇平戴琼海
Owner TSINGHUA UNIV