A comparative summary of hevc/h.265 and avc/h.264

The improvement of the existing features in H. h.264,h.265 has greatly improved the complexity of the algorithm compared with the standard, which results in better compression performance. H.265 has made significant improvements in many features, as shown in the table:

	H .
MB/CU size	4x4 ~ 16x16	4x4 ~ 64x64
Luminance interpolation	Luma-1/2 pixels | {1,-5,20,20,-5,1} LUMA-1/4 pixels}	Luma-1/2 pixels | { -1,4,-11,40,40,-11,4,-1} LUMA-1/4 pixels { -1,4,-10,57,19,-7,3,-1} luma-1/4 pixels { -1,3,-7,19,57,-10,4,-1}
MVP Prediction Method	Airspace MVP Forecast	Airspace + Time domain MVP prediction amvp\merge
Luminance Intra Prediction	4X4/8X8/16X16:9/9/4 mode	34-Angle Prediction + Planar Predictive DC prediction
chromaticity Intra Prediction	DC, Horizontal, Vertical, Plane	DM, LM, planar, Vertical, horizontal, DC, diagonal
Transform	dct4x4/8x8	dct4x4/8x8/16x16/32x32 dst4x4
Go to block filter	4x4 and 8x8 boundary deblock filtering	Large CU size, no filtering on 4x4 boundaries

The key characteristics of the table H. h.265 and the main sizes are shown above.