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Method of H.264 quick motion estimation based on multi-reference frame

A technology of fast motion and reference frame, which is applied in the field of video coding in the field of multimedia technology, can solve problems such as the increase of computational complexity, and achieve the effect of reducing computational complexity

Inactive Publication Date: 2007-07-18
ZHEJIANG UNIV
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Problems solved by technology

However, the reference implementation in H.264 performs a full search for each frame, which doubles its computational complexity

Method used

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  • Method of H.264 quick motion estimation based on multi-reference frame
  • Method of H.264 quick motion estimation based on multi-reference frame

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Embodiment Construction

[0038] As shown in Figure 3, in the encoding process of H.264, the full search method defined in the reference implementation software JM of the H.264 standard is used for any macroblock to obtain its mode 1 (P16×16) and Motion vectors for mode 4 (P8x8), namely MV(ml,0) and MV(m4,0).

[0039] Then, the motion vectors of mode 1 and mode 4 on the reference frame 1 are respectively obtained by using the forward main motion vector selection algorithm shown in FIG. 1 . In FIG. 1, since MV(mi, 1) is currently being calculated, k=0. The large block A is a block using mode 1, and the small block B is a block using mode 4, and they point to the block C pointed to by the motion vector MV(mi, k) of the reference frame k (when using mode 1, i=1) Or D (using mode 2, i.e. when i=4) has the blocks with the largest area intersections respectively E and F, and the motion vector of E and F pointing to the reference frame k+1 has been obtained when encoding the video frame. Sum the motion vect...

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Abstract

This invention discloses a H.264 quick motion estimation method based on multiple reference frames, in which, the multiple reference frame technology is newly introduced, it can increase encoding efficiency greatly but increases the complexity of encoding in linearity, and traditional method utilizes the time relativity of moving vector, and this invention utilizes time relativity and space relativity as well, in the H.264 encoding using the multiple reference frame technology, it applies said quick movement estimation method so as to reduce the complexity of operation of encoding effectively while keeping the video compressing quality.

Description

technical field [0001] The invention relates to video coding in the field of multimedia technology, in particular to the field of mobile multimedia that requires fast coding. Background technique [0002] H.264 is the latest video coding standard formulated by JVT, a joint expert group of ITU-T and MPEG. This coding standard can obtain high coding efficiency, especially in terms of low bit rate, which is significantly improved compared with MPEG-4. , very suitable for low-bandwidth, high-quality network video applications. However, in order to improve the coding efficiency, H.264 adopts many algorithms with high computational complexity. Motion estimation based on multiple reference frames is just one of them, and it accounts for about 70% of the coding time. It must be done. [0003] Compared with traditional video decoding, which only searches for matching blocks in the nearest reference frame, motion estimation based on multiple reference frames in H.264 will search for...

Claims

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Application Information

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IPC IPC(8): H04N7/26H04N7/32H04N19/176H04N19/52
Inventor 陈纯莫林剑卜佳俊杨智何科威刘彬
Owner ZHEJIANG UNIV
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