Motion forecast method based on rate-distortion optimization

Abstract

This invention discloses a motion prediction method based on rate distortion optimization, which comprises: coding end estimates the distortion value compared with original image that the decoding end rebuilds image after channel transmission, and the required bit number for coding motion information and estimating error during motion searching process; then it executes rate distortion optimization motion prediction process based on the said result. The invention can restrain the error diffusion and obtain well rate distortion optimization performance.

Description

technical field [0001] The invention relates to the technical field of video image processing, in particular to a motion prediction method based on rate-distortion optimization. Background technique [0002] Currently, the H.264 standard, formulated by the Joint Video Team (JVT) and representing the most advanced video image compression technology, uses motion prediction and mode selection based on rate-distortion optimization, as well as advanced technologies such as multiple reference frames. Compared with existing video codec standards, the H.264 standard has better rate-distortion optimization performance. [0003] Among them, in the H.264 standard, the motion prediction process based on rate-distortion optimization includes the sub-process of integer pixel motion search and the sub-process of fractional pixel refinement; and the sub-process of integer pixel motion search refers to the sub-process for each available mode in all available Search for the optimal motion ve...

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Problems solved by technology

It can be seen that the selection of weighting factor k is an uncertain process, so this method is not suitable for practical application

[0033] The second is a motion prediction method that restricts reference frames for the error diffusion problem that may occur when the multi-reference frame mode in the H.264 standard is combined with the intra-frame refresh anti-error technology; During the mode selection process, the final selected motion vector of each mode is monitored. If the image area referenced by the selected motion vector has undergone intra-frame refresh processing in the subsequent reference frame, it can be considered that the reference image area is unreliable, thus limiting Do not use this selected motion vector reference frame combination

[0037] In the motion prediction method of restricting reference frames mentioned above, the motion prediction search process is the same as the motion prediction search process in the case of no bit error, only the reference frame is limited after the motion vector is determined

Therefore, this method may have the problem of discarding more reliable reference frames that are very useful for encoding, and this method is not based on Lagrange function rate-distortion optimization control, so it cannot obtain better rate-distortion optimization performance.

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