Motion vector compression method and device
A motion vector and compression method technology, applied in image communication, digital video signal modification, electrical components, etc., can solve the problems of long time consumption and low accuracy of inter-frame prediction, reduce code stream, optimize motion estimation performance, improve Effect of Motion Estimation Velocity
Active Publication Date: 2018-10-16
PEKING UNIV
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Problems solved by technology
The compression coding of motion vectors in the existing AVS2 data compression process still has the problem of taking too long
In addition, the compression performance of the final motion vector in the inter-frame prediction process is the main factor affecting the compression performance of AVS2. Because there are certain limitations in the compression performance of the motion vector in the prior art, the accuracy of the inter-frame prediction is not high, thus There is still a certain gap between the AVS2 standard and the latest video coding standard HEVC jointly released by ITU-T VCEG and ISO / IEC MPEG standardization organization
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[0027] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.
[0028] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It should also be understood that terms such as those defined in commonly used dictionaries should be understood to have a meaning consistent with the meaning in the context of the prior art, and will not be interpreted in an idealized or overly formal sense unless defined as herein expl...
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The invention discloses a motion vector compression method and device which are used to solve the problem in the prior art that motion vector compression coding time is long in time consumption and limited in performance. The motion vector compression method includes: searching pixel accuracy areas of motion vectors and searching the motion vectors according to the two different pixel accuracy areas; expressing MV in the first area in the first expression method and expressing MV in the second area in the second expression method. According to the motion vector compression method, the motion vectors are searched according to the different pixel accuracy areas during motion search, partial pixels in the low pixel accuracy area are abandoned, then MV in the different pixel accuracy areas is properly converted and expressed in different expression method, and thus the purpose of compressing motion vectors is achieved. In addition, the compressed motion vectors are coded so code streams are reduced, motion estimation performance is optimized, motion estimation speed is improved and gains of coding performance are acquired.
Description
technical field [0001] The invention belongs to the technical field of data compression, and in particular relates to a motion vector compression method and device. Background technique [0002] In the field of video compression technology, the international mainstream coding standard is H.264 / AVC, the first generation video compression coding standard in my country is MPEG-2, and AVS is the second generation source coding standard with independent intellectual property rights in my country. In 2012, AVS+ introduced advanced field technology and entropy coding technology, and officially became the broadcasting industry standard. At present, my country's upcoming AVS2 standard is the next-generation standard of AVS. [0003] AVS2's quadtree-based block mode and flexible reference frames greatly improve the coding performance of AVS2 for high-definition video sequences, thus saving up to 50% of the bandwidth compared to the previous international mainstream coding standard H....
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IPC IPC(8): H04N19/523H04N19/53H04N19/567
Inventor 马思伟马俊铖王苫社罗法蕾
Owner PEKING UNIV