Frame and intraframe coding mode selection method

A technology of intra-frame coding and coding mode, which is applied in the field of coding mode selection algorithm to achieve the effect of improving the coding speed

Inactive Publication Date: 2008-06-11
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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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.

Method used

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  • Frame and intraframe coding mode selection method
  • Frame and intraframe coding mode selection method
  • Frame and intraframe coding mode selection method

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Embodiment Construction

[0045] In the case of limited intra-frame prediction, only adjacent Intra macroblocks can provide intra-frame prediction. Obviously, the rate-distortion performance of the Intra mode cannot be evaluated by the boundary pixel value difference between the current macroblock and adjacent macroblocks in the prior art.

[0046] In order to quickly select the Inter mode and the Intra mode, the present invention adjusts the encoding order of the 16 4×4 luma blocks in the macroblock specified in Figure 1(a) to the processing order shown in Figure 1(b) . In this way, after processing the four 4×4 squares at the top of the macroblock, the spatial correlation index inside the macroblock can be calculated immediately, that is, the lowest reconstruction image of blocks 0, 1, 2, and 3 in Figure 1(b) can be calculated. one line ( figure 2 The 3rd row in the middle) and the top row of the 4th, 5th, 6th, 7th original image (ie figure 2 The sum of the absolute value difference of the pixel v...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/34H04N7/32H04N7/26H04N19/107
Inventor 宋立锋
Owner ZTE CORP
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