Image encoding/decoding method and device therefor
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
 Embodiments of the present invention propose a method for filtering boundary pixels when the intra-frame prediction (intra-picture prediction) of a non-square block is a DC mode.
 as above Figure 7 and Figure 8 As described in , in case of DC mode filtering is performed for the left and top block boundaries. However, in HEVC, filtering is performed only for luma blocks with a block size of 16×16 or smaller.
 Constraints need to be adaptively applied to non-square blocks. However, according to the method currently defined above, since the filtering of boundary pixels is only applied to blocks with a block size of 16×16 or smaller, the constraints may not be adaptively applied to blocks of 32×4, 4×32, 4×32, etc. Width length or height length. In order to solve such a problem, there is proposed a method for determining whether to perform filtering according to an adaptive condition when the prediction mode is the DC mode.
 Figure 25 is a di...
Embodiment approach 2
 Embodiments of the present invention propose a method for filtering boundary pixels when the intra prediction mode of a non-square block is a horizontal mode or a vertical mode.
 as above Figure 9 Horizontal mode of HEVC as described in (or mode #17, #18 or #19 in the prediction method using 67 intra prediction modes) and as above Figure 10The vertical mode of HEVC (or mode #49, #50 or #51 in the prediction method using 67 intra prediction modes) described in is subject to block boundary pixel filtering.
 However, filtering is not performed under all conditions, and in the following Figure 26 Filtering is performed only on blocks whose predicted block size is 16×16 or smaller under the illustrated conditions.
 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.
 refer to Figure 26 , when boundar...
Embodiment approach 3
 Embodiments of the present invention propose intra prediction modes for non-square blocks when the total number of intra prediction modes is 2 or 34 when the total number of intra prediction modes is 35, and when the total number of intra prediction modes is 67. When the prediction mode is 2 or 66, the filtering method of the boundary pixels of the prediction block.
 as above Figure 11 to Figure 16 The filter determination structure of the mode of filtering the boundary pixels belonging to the four lines around the block boundary described in , is partially modified and applied to 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.
 In the QTBT structure, due to the binary tree, the minimum block size may correspond to 4×N or N×4 in the case of luma, and may correspond to 2×N or N×2 in the case...
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