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Inter-frame mode selecting method

A technology of inter-frame mode and intra-frame mode, which is applied in the field of video coding, can solve the problems of slow calculation speed and high computational complexity, and achieve the effects of easy implementation, saving encoding time, and reducing encoding computational complexity

Active Publication Date: 2008-04-09
INST OF COMPUTING TECH CHINESE ACAD OF SCI
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Problems solved by technology

This method is difficult to overcome the influence of noise on regional judgment, and requires a large number of calculations of frame coefficients to help determine the encoding mode, resulting in high computational complexity and slow calculation speed

Method used

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Embodiment Construction

[0027] The invention divides the image into different areas, and selects different modes for different areas. When performing mode selection, the pre-judgment criteria based on skip mode and Intra8×8 mode further help fast mode selection. The specific implementation method is as follows:

[0028] If the video frame size is M×N pixels, the current frame is the tth frame, and the previous reference frame is the (t-1)th frame.

[0029] Calculate the pixel difference threshold between the current frame and the previous frame according to formula (1); where P is the pixel value at the frame coordinate (i, j). The pixel difference is calculated according to formula (2).

[0030] PixThr t = 1 M · N Σ i = 1 M Σ j = ...

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Abstract

The invention relates to an interframe mode selection method. According to temporal and spatial correlations of front and back frames, calculate the pixel difference of the front and the back frames; and calculate block difference rate and block difference rate threshold; according to the block difference rate and the threshold, divide into different interest regions; limit the mode selection range according to the relation between different regions and interframe predict encoding mode; design leap mode and pre-decision criterion of interframe mode for mode decision. By standard video sequence test with different characteristics, the algorithm can greatly reduce AVS encoding computation complexity with almost no loss on SNR and code rate on the premise of perceived quality guarantee. The method is also applicable to other video standard with macroblock as unit encoding, with good expansibility and practicability.

Description

technical field [0001] The invention relates to the fields of video coding, video compression, video transmission, video storage, and multimedia video applications, and in particular to an inter-frame mode selection method. Background technique [0002] As an important part of advanced audio and video coding technology, AVS-Part2 (AVS for short) is a video standard with independent intellectual property rights in my country, and it can provide coding performance similar to H.264 / AVC. The AVS standard adopts a hybrid coding framework of motion estimation, compensation and transformation. Because it uses new technologies such as multi-reference frame motion estimation with variable block sizes, multi-mode intra-frame prediction, and two-dimensional entropy coding, compared with previous standards, Coding efficiency can be increased by 1.5 to 2 times. The basic unit of encoding is a macroblock. Because the size of the macroblock is variable, the size of the macroblock can be ...

Claims

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Application Information

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IPC IPC(8): H04N7/32H04N7/26H04N19/167H04N19/593
Inventor 袁庆升陈益强
Owner INST OF COMPUTING TECH CHINESE ACAD OF SCI
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