Fast intra prediction mode selection method based on block features
A technology for intra-frame prediction mode and mode selection, which is applied in the field of video coding and can solve problems such as slow transformation
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Embodiment 1
[0092] image 3 Shown is a flow chart of a method for selecting an intra prediction mode for a luma 16×16 block.
[0093] Step ①: first select the mode of 16×16 blocks for the luminance component. When the encoder enters the mode selection of the 16×16 block, first select the mode of the 16×16 block; judge whether the adjacent blocks on the left and the top of the 16×16 block exist, and if so, go to step ②; if Does not exist, go to step ⑤;
[0094] Step ②: When the pixel values on both sides exist, respectively define the variance of the 16 pixels on the left side of the block and the 16 pixels on the top side, which are recorded as var1 and var2 respectively;
[0095] The variance is still according to the formula var=EX 2 -(EX) 2 calculate. Specifically in the image, it is calculated according to the following formula:
[0096] var 1 = EX 2 - ( EX ...
Embodiment 2
[0109] Figure 4 Shown is a flow chart of a method for selecting an intra prediction mode for a chroma 8×8 block.
[0110] Step ①: first select the mode of 8×8 blocks for the chrominance component. When the encoder enters the mode selection of the 8×8 block, first select the mode of the 8×8 block; judge whether the adjacent blocks on the left and the top of the 8×8 block exist, and if so, go to
[0111] Step ②; if it does not exist, go to step ⑤;
[0112] Step ②: When the pixel values on both sides exist, respectively define the variance of the four pixels on the left side of the block and the four pixels on the top side, which are recorded as var1 and var2 respectively;
[0113] The variance is still according to the formula var=EX 2 -(EX) 2 calculate. Specifically in the image, it is calculated according to the following formula:
[0114] var 1 = EX 2 - ( ...
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