Method for searching active image series motion vector
A technology of motion vectors and moving images, which is applied in image communication, television, electrical components, etc., and can solve the problem that the search speed and search quality cannot be balanced
Inactive Publication Date: 2008-06-04
BEIJING FOUNDER ELECTRONICS CO LTD +1
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[0006] For the defects existing in the prior art, the purpose of this invention is to provide a search method for motion vectors of moving image sequences, which solves the problem that the search speed and search quality cannot be balanced in the existing methods, and realizes that moving image sequences are searching for motion vectors. At the same time, the image quality comparable to that of the diamond search algorithm can be obtained, and at the same time, the search efficiency and speed comparable to that of the cross search algorithm can be obtained.
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[0024] Below in conjunction with accompanying drawing and embodiment the present invention will be further described, and flow chart of the present invention is as follows figure 1 shown.
[0025] Taking an image sequence whose GOP (Group Of Pictures) length is 12 and the repetition frequency of the reference frame is 3 as an example, the steps of motion vector search using the method of the present invention will be described below.
[0026] Assuming that the sequence of frames played in an image sequence is ...BBIBBPBBPBBPBBI..., it should be ...IBBPBBPBBPBBIBB... in the compressed sequence, and it is numbered for the convenience of explanation. After numbering, the playback sequence is...B 01 B 02 I 1 B 11 B 12 P 1 B 21 B 22 P 2 B 31 B 32 P 3 B 41 B 42 I 2 ..., the compressed sequence is...I 1 B 01 B 02 P 1 B 11 B 12 P 2 B 21 B 22 P 3 B 31 B 32 I 2 B 41 B 42 ....
[0027] In this specific embodiment, the search method of a moving image sequenc...
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This invention relates to a search method for motion vectors of a motion picture sequence. The cross search algorithm considering the central search zones is suitable for the image sequences with slight movement and the diamond search algorithm considers the overall motion vectors. The cross search algorithm is quicker than that of the diamond, but is focused on the central distribution motion vectors and is easy to fall into the partial smallest motion vector and reduce the compressed image quality. This invention puts forward a method of predicating this time search result based on the last result, which can adjust the motion vectors automatically and gets the image quality same with the diamond method and the same searching speed with the cross search.
Description
technical field [0001] The invention belongs to the field of digital video compression, and in particular relates to a search method for moving image sequence motion vectors. Background technique [0002] In the prior art, in the field of digital video compression, video files are often very large, usually above 100 Mbytes. In order to save storage space, video files often need to be compressed. Each video file is composed of a single picture stream, and each single picture can be divided into many "macro blocks" of 16×16 pixels. This block method simplifies the processing of each step in the video file compression method process. For example, a picture captured from a standard definition standard video streaming solution (720×480) is divided into 1350 (45×30) macroblocks, and then further processed at the macroblock level. [0003] The MPEG2 video standard defines three kinds of images: intra-frame image I (intra), predictive image P (predicted) and bidirectional predicti...
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IPC IPC(8): H04N7/26H04N19/56H04N19/57
Inventor 何广郭宗明
Owner BEIJING FOUNDER ELECTRONICS CO LTD