Intra mode prediction method and device and coder

An intra-frame mode and prediction method technology, applied in the coding field, can solve the problems of ignoring relations and inaccurate mode prediction of blocks to be coded, and achieves the effect of accurate mode prediction and reduction of code words.

Active Publication Date: 2010-11-03
南通市崇川科技园投资发展有限公司
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Problems solved by technology

[0009] In the process of realizing the present invention, the inventors found that the existing intra-frame mode prediction technology has at least the following problems: According to the two adjacent blocks of the block to be encoded, namely: the optimal mode of the adjacent upper block and the adjacent left block When calculating the most probable mode of the block to be encoded, the mode corresponding to the smaller mode n

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  • Intra mode prediction method and device and coder

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[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0037] image 3 is a schematic diagram of the distribution of the block to be coded and the reference block, image 3 In , if the optimal mode of the adjacent left block B is the horizontal mode, that is, the mode number is 1, it means that the texture level correlation in the adjacent left block B is higher. Since the adjacent left block B is the left adjacent block of the current block X to be encoded, for the nine prediction modes of the block X to be encoded, ...

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Abstract

The invention discloses an intra mode prediction method, an intra mode prediction device and a coder. The method comprises the following steps of: when the optimal mode of an adjacent left block is a horizontal mode, taking the horizontal mode as the most possible mode of a block to be coded; when the optimal mode of an adjacent upper block is a vertical mode, taking the vertical mode as the most possible mode of the block to be coded; when the optimal modes of the adjacent left block and the adjacent upper block are the same, taking the same mode as the most possible mode of the block to be coded; when the serial numbers of the optimal modes of the adjacent left block and the adjacent upper block belong to a set {8, 6}, taking the horizontal mode as the most possible mode of the block to be coded, and when the mode serial numbers of the optimal modes of the adjacent left block and the adjacent upper block belong to a set {3, 4} or {7, 5}, taking the vertical mode as the most possible mode of the block to be coded; and selecting the optimal mode in the optimal modes of the adjacent left block and the adjacent upper block, which has a smaller mode serial number, as the most possible mode of the block to be coded. The embodiment of the invention can improve the accuracy of intra mode prediction.

Description

technical field [0001] The present invention relates to encoding technology, in particular to an intra-frame mode prediction method and device, and an encoder. Background technique [0002] In the intra-frame prediction of the video coding H.264 standard, the intra-frame mode of the block to be coded can be predicted in advance through the intra-frame mode prediction technology, and the predicted intra-frame mode is called the most probable mode. When the most probable mode is different from the optimal mode obtained by calculation, a total of 4 bits of encoding mode information need to be transmitted to the decoder in the code stream, where 1 bit indicates whether the most probable mode is the same as the optimal mode. , 3 bits represent the mode number of the optimal mode. When the most probable mode is the same as the optimal mode obtained by calculation, only one bit of flag information needs to be transmitted to the decoder in the code stream. The mode difference is r...

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Application Information

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IPC IPC(8): H04N7/26H04N7/32H04N19/159
Inventor 季鹏飞
Owner 南通市崇川科技园投资发展有限公司
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