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Conversion method from compression domain MPEG-2 based on interest area to H.264 video

A region of interest and video conversion technology, applied in the direction of digital video signal modification, television, electrical components, etc., can solve the problems of increased computational complexity, inappropriate real-time conversion requirements, etc., to improve video quality, fast and accurate region of interest Detecting, increasing the effect of transformation complexity

Inactive Publication Date: 2009-07-22
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

However, due to the need for quantization error and interpolation error compensation in the compressed domain, the computational complexity of this method is also greatly increased, and the requirements for real-time conversion are not suitable, which is also the disadvantage of this method

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  • Conversion method from compression domain MPEG-2 based on interest area to H.264 video
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  • Conversion method from compression domain MPEG-2 based on interest area to H.264 video

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Embodiment Construction

[0022] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings: the present embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and processes are provided, but the protection scope of the present invention is not limited to the following implementations example.

[0023] like figure 1 As shown, this embodiment can be divided into the following steps:

[0024] (1) Compressed domain conversion of intra-coded frames

[0025] The entropy decoding of the MPEG-2 input code stream can easily obtain the encoding type of each frame, and different conversion methods are used for frames of different encoding types. The specific method is as follows:

[0026] Entropy decoding to obtain the encoding type of the current frame.

[0027] ·If the current frame is an intra-coded frame, no region of interest detection is performed, only MPEG-2 inverse quan...

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Abstract

The method comprises: making the conversion for the intra-frame coding frame; only making the transformation from the compress domain digital cosine transform coefficient to the integer transform coefficient; making transformation for the compress domain intra-frame prediction. Making detection for the interested area in the compress domain: the summation of absolute values of the horizontal component and vertical component of current macro block motion vector is less than or equals the threshold TH, then the macro block is estimated as an interested area. Making transformation for the non-interested area: making compress domain open-loop transformation; by using the transformation from the intra compress domain digital cosine transform coefficient to the integer transform coefficient, making re-quantization. Making transformation for the interested area: in the compress domain, making quantization error compensation; making the interpolation error compensation close-loop transformation.

Description

technical field [0001] The present invention relates to a method for video conversion in the technical field of telecommunications, and more specifically, relates to a method for realizing video conversion from compressed domain MPEG-2 to H.264 based on a region of interest. Background technique [0002] Video conversion technology is the conversion of one compressed format video stream into another compressed format. At present, for various video application fields, there are various video coding standards, such as the MPEG-2 standard, the MPEG-4 standard, and the H.264 standard formulated by the Moving Picture Experts Group (MPEG organization). How to implement conversion efficiently and with high quality so that it can be adapted to different hardware devices has always been the most concerned issue in the industry. The H.264 standard formulated by the Joint Video Team (JVT Organization) jointly established by the Motion Picture Experts Group (MPEG Organization) and the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/26H04N7/50H04N19/124H04N19/167H04N19/176H04N19/513H04N19/52H04N19/70
Inventor 解蓉杨小康郑世宝张文军
Owner SHANGHAI JIAO TONG UNIV
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