Frame and intraframe coding mode selection method

Abstract

The invention provides a selection method of an encode mode between interframe and inframe, which includes the following steps: (1) after the interframe model cost JInter is calculated, an Intra cost Ji of four square blocks at the top of a micro block is calculated, and image reconstructions of the four square blocks are completed,; (2) relative index SADBE1 of the inner space of the micro block are calculated; (3) a predicted value JInter1 of the Intra cost is calculated, according to the Intra cost of the four square blocks at the top of the micro block, an offset QP0(QP) of mode selection and the relative index of the inner space of the micro block; (4) whether the predicted Intra cost JInter1 is larger than the calculated Inter cost JInter or not is judged, if yes, the encode mode of the micro block is determined to be an Inter mode, and the method is completed; if no, the step (5) is carried out; (5) Intra cost of four square blocks which are adjacent to the four square blocks at the top of the micro block is calculated, and the image reconstructions of the four square blocks are completed; (6) relative index SADBE2 of the inner space of the micro block is calculated; (7) a predicted value JInter2 of the Intra cost is calculated; (8) whether the Intra cost JInter2 is larger than the Inter cost JInter or not is judged, if yes, the encode mode of the micro block is determined to be an Inter mode, and the method is completed.

Description

technical field [0001] The invention relates to a coding mode selection algorithm in real-time video coding. Background technique [0002] Video coding algorithms include intra-frame coding and inter-frame coding with motion-compensated inter-frame prediction. The inter-frame coding mode with motion-compensated inter-frame prediction (hereinafter referred to as Inter mode) has an incomparable advantage over the intra-frame coding mode (hereinafter referred to as Intra mode) in terms of compression ratio. Therefore, at the image frame level and 16×16 image block (called macroblock) level, try to use Inter mode to obtain a high compression ratio, that is, P frame and Inter macroblock. Only use I frames at the initial moment (including the absolute initial moment and cut-in moment of the sequence) and when it is necessary to correct or cope with transmission errors (the encoding mode at the image frame level is Intra), when inter-frame block matching fails and local image loss...

AI Technical Summary

Problems solved by technology

However, the fast inter-frame and intra-frame mode selection algorithm in the prior art only considers and can only be applied to the coding situation where the intra-frame prediction is not limited.

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