Image encoding/decoding method and device thereof
A decoding device and image technology, applied in image communication, digital video signal modification, electrical components, etc., can solve the problems of memory storage, memory access rate and processing power increase, and achieve the effect of enhancing compression performance
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Embodiment approach 1
[0290] The embodiment of the present invention proposes a filtering method of boundary pixels when intra prediction (intra-picture prediction) of a non-square block is DC mode.
[0291] as above Figure 7 and Figure 8 As described in , in the case of DC mode, filtering is performed for the left block boundary and the top block boundary. However, in HEVC, filtering is performed only for luma (luma) blocks with a block size of 16×16 or less.
[0292] Constraints need to be applied adaptively to non-square blocks. However, according to the method currently defined above, since filtering of boundary pixels is only applied to blocks of block size 16×16 or smaller, constraints may not be adaptively applied to 32×4, 4×32, 4×32, etc. width length or height length. In order to solve such a problem, a method for determining whether to perform filtering according to an adaptive condition when the prediction mode is the DC mode is proposed.
[0293] Figure 25 is a diagram illustra...
Embodiment approach 2
[0304] The embodiment of the present invention proposes a filtering method of boundary pixels when the intra prediction mode of the non-square block is the horizontal mode or the vertical mode.
[0305] as above Figure 9 Horizontal mode of HEVC (or mode #17, #18 or #19 in prediction method using 67 intra prediction modes) as described in and as above Figure 10The vertical mode of HEVC described in (or mode #49, #50 or #51 in a prediction method using 67 intra prediction modes) is subjected to block boundary pixel filtering.
[0306] However, filtering is not performed under all conditions, and in the following Figure 26 Filtering is performed only on blocks with a predicted block size of 16x16 or less under the conditions exemplified.
[0307] Figure 26 is a diagram illustrating boundary pixel filtering processing when the intra prediction mode is the horizontal / vertical mode according to an embodiment of the present invention.
[0308] refer to Figure 26 , when boun...
Embodiment approach 3
[0326] Embodiments of the present invention propose intra-frames of non-square blocks when the total number of intra-frame prediction modes is 35, when the intra-frame prediction mode is 2 or 34, and when the total number of intra-frame prediction modes is 67 When the prediction mode is 2 or 66, the filtering method of the boundary pixels of the prediction block.
[0327] as above Figures 11 to 16 As described in , the filtering determination structure of the mode of filtering the boundary pixels belonging to four rows around the block boundary is partially modified and applied in the current QTBT structure. However, since such a determination structure is not optimized in the current QTBT structure, this embodiment proposes a method that can efficiently apply filtering of boundary pixels.
[0328] In the QTBT structure, due to the binary tree, the minimum block size may correspond to 4xN or Nx4 in the case of luma, and the minimum block size may correspond to 2xN or Nx2 in ...
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