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H.263/AVC integer pixel vectors search algorithm

A search algorithm and vector technology, applied in television, electrical components, digital video signal modification, etc., can solve problems such as rough principles, scattered search areas, large image loss, etc., to ensure peak signal-to-noise ratio and code stream size, reduce Small amount of calculation, the effect of relieving stress

Inactive Publication Date: 2008-07-23
SHANGHAI HOW ZONE NETWORK COMM DEVICES
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Problems solved by technology

However, this kind of algorithm is relatively rough in principle, and it is very easy to fall into the trap of local minimum, so the image loss usually caused is very large.
Another disadvantage of the three-step method is that it is difficult to reuse hardware due to the scattered search areas.

Method used

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  • H.263/AVC integer pixel vectors search algorithm
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  • H.263/AVC integer pixel vectors search algorithm

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Embodiment Construction

[0026] Compared with the previous generation algorithm, H.263 uses methods such as thinning inter-frame prediction macroblocks, introducing intra-frame prediction, introducing 1 / 4 sub-pixels, and integer DCT transformation. Under the same visual effect, the code The stream is only about 50% of MPEG4. As its key technology, inter-frame prediction plays a decisive role in improving the compression ratio. H.263 supports 7 different sizes of macroblock division: 16×16, 16×8, 8×16, 8×8, 8×4, 4×8, 4×4. In terms of calculation volume, the calculation volume of inter-frame compression should reach about 50% of the entire compression calculation volume, and this ratio can even be as high as 70% if multiple reference frames are used.

[0027] Specifically, inter-frame prediction is to find the reference image that best matches the current image block on the reference frame, and then perform motion compensation on this basis. The acquisition of the motion vector is usually achieved by ...

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Abstract

The invention provides an algorithm for searching H.263 / AVC integer pixel vectors, which introduces an algorithm for searching H.263 / AVC integer pixel vectors which is suitable for hardware to achieve through various common integral pixel vectors searching algorithms. The algorithm realizes the rapid searching of integral pixel through the prediction of a vector and a zonal searching, which is successfully realized on an IP tone and video encoding chip at present. The result shows that the invention can greatly relieve the pressure of memory access, decrease the computation, and simultaneously guarantees the SNR of video peak value and the bit rate size.

Description

technical field [0001] The invention relates to a technology of video signal compression. Background technique [0002] Video image compression is widely used in mobile communication, video conferencing, digital TV and other fields. With the development of camera technology and the increasing requirements for image compression ratio and image signal-to-noise ratio, H.263 is currently being promoted as a new compression standard. [0003] H.263 was jointly launched by the MPEG working group and the ITU working group. It is a block-based hybrid coding. The main working principle is to use the temporal correlation and spatial correlation of video images, through intra-frame / inter-frame prediction and transform coding. Compress image information. [0004] Inter-frame prediction requires a large number of addition operations when matching search points, so in essence, the design of the algorithm is the process of trying to reduce the search points. When evaluating the pros and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/32H04N7/26H04N19/50H04N19/61
Inventor 周文娟胡铮郑坚钧王小明沈国华
Owner SHANGHAI HOW ZONE NETWORK COMM DEVICES
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