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Intra-frame prediction method and device

An intra-frame prediction and predicted value technology, which is applied in the fields of digital video signal modification, electrical components, image communication, etc., can solve problems such as unfavorable hardware implementation, complicated control process, unfavorable hardware pipeline implementation, etc., and achieves easy hardware implementation and processing sequence. Consistent, reduced rebuild latency effects

Active Publication Date: 2014-03-19
CHINESE AERONAUTICAL RADIO ELECTRONICS RES INST
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Problems solved by technology

[0007] There are the following defects in the prior art: the use of the rate-distortion cost function is not conducive to the pipeline implementation of the hardware, and basically every model prediction needs to wait for the completion of the reconstruction; although the Chinese patent application number 200910100537.4 can effectively reduce the waiting time, its control process Complicated, not conducive to hardware implementation

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[0026] Such as figure 1 As shown, the intra-frame prediction method in this embodiment includes the following steps and functions: sub-block prediction order adjustment; luma 4×4 mode prediction; luma 16 mode prediction; chroma 8×8 mode prediction; mode judgment; .

[0027] The intra-frame prediction method specifically includes the following steps: first perform mode prediction on the 16×16 macroblocks input to the intra-frame prediction buffer according to the adjusted 4×4 sub-block prediction order to obtain prediction values ​​in various modes, and then According to the SAD (Sum of Absolute Differences) evaluation criterion, calculate the SAD value in each prediction mode, and select the mode with the smallest SAD value as the maximum value of 4×4 sub-blocks (sixteen sub-blocks). The best prediction mode, after processing the sixteen sub-blocks, the sum of the best prediction mode of the sixteen sub-blocks and the macroblock SAD in the best prediction mode of the correspo...

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Abstract

The invention discloses an intra-frame prediction method and device. The intra-frame prediction method comprises the following steps of: carrying out mode prediction on a 16*16 macro block input to an intra-frame prediction buffer area according to the regulated 4*4 subblock prediction order to obtain a prediction value under each mode, calculating an SAD (Sum of Absolute Differences) value under each prediction mode, selecting a mode with minimum SAD value as an optimal prediction mode of 16 subblocks to obtain an optical prediction mode of the 16 subblocks and a Sun_SAD4 of the SADs of the macro block under the optimal prediction mode of the corresponding subblocks; obtaining the optimal 16*16 prediction mode and the macro block SAD16 under the corresponding optimal mode; and finally comparing the Sum_SAD4 value with the SAD16 value, determining a prediction mode adopted by the macro block, and after the prediction is completed, sending the optical prediction mode and a prediction residual error to a subsequent processing module. According to the invention, reestablishment waiting time in the prediction process is reduced, and intra-frame prediction in a high-resolution video compression process can be processed in real time.

Description

technical field [0001] The present invention relates to an intra-frame prediction technology, in particular to an intra-frame prediction method and device. Background technique [0002] H.264 / AVC is a new-generation video coding standard formulated by the Joint Video Team (JVT) composed of ISO / IEC and ITU-T. The H.264 / AVC standard has better PSNR performance than the encoding methods stipulated in the MPEG-4 standard and the H.263++ standard. The PSNR (Peak Signal-to-Noise Ratio) of H.264 / AVC is 2dB higher than MPEG-4 on average, and 3dB higher than H.263++ on average. Under the same reconstructed image quality, the amount of data encoded by H.264 / AVC is at least 60% smaller than that of H.263++ and MPEG-4 (SP). Under the same reconstructed image quality, H.264 / AVC encoded data has strong adaptability to channel delay. The H.264 / AVC standard can be applied to low-latency modes (such as video conferencing) to meet real-time services, and can also work in occasions without ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/50H04N19/61H04N19/176H04N19/186H04N19/11H04N19/593
Inventor 杨爱良王科李修杰
Owner CHINESE AERONAUTICAL RADIO ELECTRONICS RES INST