Fast intra prediction mode selection method based on block features
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An intra-frame prediction mode and mode selection technology, applied in the field of video coding, can solve the problem of slow transformation and achieve the effect of increasing speed
Inactive Publication Date: 2011-04-06
WUHAN UNIV
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However, a defect of this method is that the entire block transformation is required to be very slow, that is to say, the fluctuation of a whole block of numbers is very small to ensur
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Embodiment 1
[0061] image 3 Shown is a flow chart of a method for selecting an intra prediction mode for a luma 16×16 block.
[0062] 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;
[0063] 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;
[0064] 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:
[0065] var 1 = EX 2 - ( EX ...
Embodiment 2
[0078] Figure 4 Shown is a flow chart of a method for selecting an intra prediction mode for a chroma 8×8 block.
[0079] 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 step ②; if Does not exist, go to step ⑤;
[0080] 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;
[0081] 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:
[0082] var 1 = EX 2 - ( EX ) ...
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Abstract
The invention relates to the technical field of video coding, in particular to a fast intra prediction mode selection method based on block features. By using brightness 4*4 blocks, brightness 16*16 blocks and chroma 8*8 blocks as objects, the texture change of a current block is judged by respectively calculating the variance of four pixels respectively positioned at the upper side and the left side of the current block, thereby determining the relevant mode or deleting the irrelevant mode so as to achieve the purpose of raising the video coding speed on the premise of ensuring the video coding quality. The algorithm solves the defect that the algorithm in the latest proposal is only applicable to image blocks subjected to a gentle change. On an optimized x264 mobile phone platform, the speed can be raised by 0.5-2 fps when the brightness 4*4 blocks, the brightness 16*16 blocks and the chroma 8*8 blocks are simultaneously modified, thereby well realizing the unification of the coding speed and the efficiency.
Description
technical field [0001] The present invention relates to the technical field of video coding, in particular to a fast intra-frame prediction mode selection method based on block features. Background technique [0002] With the continuous development of time, H.263 in 1996, H.263+ in 1998, H.263++ in 2000, and in 2001, MPEG recognized the potential advantages of H.264 and combined with VCEG The necessity of work, so the two cooperated to establish the Joint Video Team (JVT), thus forming the unified standard H.264 / AVC released in the second quarter of 2003. [0003] The new generation of video coding standard H.264 / AVC adopts a number of new coding technologies. Compared with the previous video coding standards, it greatly improves the compression efficiency while maintaining good decoding quality. However, when obtaining high compression efficiency At the same time, the computational complexity has risen sharply, and it is difficult to realize real-time coding in many resour...
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