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Motion estimating method and device in video compression system

A video compression and motion vector technology, applied in the field of motion estimation, can solve the problems of short coding length, small frequency distribution range, no compression effect, etc., and achieve the effect of good compression efficiency

Active Publication Date: 2005-06-01
MEDIATEK INC
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Problems solved by technology

But using known techniques or the method proposed in US patent case No. 5,847,776, the best-fit block found has a way to make the residual values ​​in the frequency domain have a small frequency distribution range
At this time, even if the best matching block found can make the residual value in the space field have the smallest absolute difference sum, but after discrete cosine transform, quantization procedure, saw ruler scan (or other scan methods), and can After variable-length coding and other operations, the obtained residual value may not have the shortest coding length, so it may not be able to achieve the best compression effect

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  • Motion estimating method and device in video compression system
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  • Motion estimating method and device in video compression system

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Embodiment Construction

[0033] see figure 1 , figure 1 It is a flowchart of an embodiment of the method proposed by the present invention. The method proposed by the present invention can be used for motion estimation in a video compression system which divides a current frame into a plurality of blocks. will be detailed below Figure 1 The steps in:

[0034] Step 110: For a current coding block in the current frame, step by step check a plurality of candidate motion vectors (x, y) in a search area, wherein the current coding block includes (i1-i0)×(j1- j0) pixels.

[0035] Step 120: For each candidate motion vector (x, y), calculate the following cost function

[0036] CF ( x , y ) = Σ i = i 0 i 1 Σ j = ...

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Abstract

The motion estimating and measuring method and device in video compression system may adopts cost function unlike that in available technology in calculating one optimal motion vector of the current coded block. The cost function the present invention adopts has not only the traditional 'absolute difference sum' considered, but also the quantizing step length and the pixel difference value variation state of the current coded block relative to the blocks in one search arean of the destination picture considered, so that the cost function the present invention can find out the optimal motion vector corresponding to residual value capable of being treated to obtain relative high compression efficiency.

Description

technical field [0001] The present invention relates to a method and related device for motion estimation in a video compression system, in particular to a method and related device for motion estimation using a cost function different from the known technology. technical background [0002] In recent years, multimedia technology has developed vigorously, and with the development of multimedia technology, more and more video compression standards have been proposed one after another. For example, various versions of MPEG technology are compression standards used to store and transmit video data in digital form. As for other video compression standards, there are ITU H.261, H.263, ISO 10918 and so on. [0003] The international video standard proposed by MPEG defines a specification for compressing digital video. A dynamic video is composed of a series of pictures (pictures), and each picture can be regarded as a two-dimensional array composed of many pixels (pixels), and e...

Claims

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Application Information

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IPC IPC(8): H04N19/176H04N19/51
Inventor 何镇在
Owner MEDIATEK INC
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