A motion vector search method and device in video coding
A motion vector search and video coding technology, applied in the field of image processing, can solve the problem of low speed of motion vector search, and achieve the effect of reducing the number of times and speeding up the efficiency.
Active Publication Date: 2008-09-17
江西国云科技有限公司
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[0005] However, due to the limitation of the on-chip high-speed memory capacity, the processor needs to access a large number of off-chip slow-speed memories, resulting in low motion vector search speed
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[0048] In order to make the objectives, technical solutions, and advantages of the present invention clearer and more comprehensible, the following describes in further detail a motion vector search method and device in video coding of the present invention with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.
[0049]As an implementable manner, the motion vector search method of the present invention is a block matching method. First, the image frame to be encoded is divided into a plurality of fixed-size macroblocks, for example, the size of the macroblock is 16×16 pixels; The macroblocks are coded one by one according to the macroblock row order of the video image frame, and for a frame of video image, it is through the repeated process of coding a row of macroblocks. For each macro block, the most matching block i...
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The invention discloses a method and a device for searching a motion vector in video coding. The method comprises the following steps: match calculating with searching windows data of current coding macro-block stored in an in-chip memory to obtain the motion vector of current coding macro-block; reading searching windows of next coding macro-block, which are not overlapping with the searching windows of current coding macro-block, from a out-chip memory, and storing in the storing position of the in-chip memory to obtain the searching windows of the next macro-block which is stored consecutively in rows; match calculating with the searching windows data of the next macro-block to obtain the motion vector of the next coding macro-block. The searching device comprises a processing unit for reading the searching windows of the next coding macro-block not overlapping with the searching windows of current coding macro-block, and storing in a high-speed storing unit. The invention fastens the efficiency of motion vector searching, and can be applied to design of video coding chip and embedded video coding software.
Description
Technical field [0001] The present invention relates to an image processing method, in particular to a motion vector search method and device in video coding. Background technique [0002] Motion vector search has been widely used in computer dynamic image processing. As the correlation between image frames is utilized, the number of bits required for encoding is greatly reduced. The existing motion vector search method is a block matching method, that is, the image frame to be encoded is first divided into fixed-size macroblocks, and for each macroblock, search in the pre-defined search area (search window) of the previous frame The displacement difference of the most matching macroblock is the motion vector. The previous frame image is also called the reference frame image. [0003] The matching criterion of the existing block matching method generally adopts the method of the absolute value and minimum of the pixel value difference. For example, the current macro block to be e...
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IPC IPC(8): H04N7/26H04N7/50H04N19/57
Inventor 张绘国陈益强纪雯汤博
Owner 江西国云科技有限公司