CN1486090A - Half pixel filtering method for video compression domain - Google Patents

Abstract

The invention is a kind of compressing field video semi-element filter method which can enhance the video quality, reduces the complexity of video operation. The character of the invention is: selects the semi-element filter method according to the position of extraction block; uses the method to filter the compression field coefficient, gets the correspondent semi-element position compression field parameter.

Description

Video compression territory half-pix filtering method

Technical field

The present invention relates to the technical field of network, the method for particularly a kind of video compression territory half-pix filtering.

Technical background

Along with the development of network technology, computing technique, based on network Video Applications occurs in a large number.There is isomerism in the equipment of access network, and computing capability there are differences, and the video standard of support also has nothing in common with each other.The video coding technique computation complexity is bigger, can't satisfy the demand of all types of user.Video code conversion, editing technique can be operated compressed video code flow again, improve video processing speed.

So-called half-pix is meant at the pixel between whole pixel.In discrete picture was handled, half-pix point was not that physics exists, and is to exist in order to satisfy certain purpose, for example accurately motion compensation, picture up-sampling etc.

Video encoding standard is generally supported the half-pix estimation, and the half-pix estimation has improved video quality greatly, has reduced the code stream code check.If the compressed domain video treatment technology is not supported half-pix, can't satisfy current demand.

Video encoding standard extensively adopts dct transform, can effectively reduce the spatial redundancies of video.So related compression domain is meant the result of discrete cosine transform dct transform among the present invention.

Summary of the invention

The object of the present invention is to provide the method for a kind of video compression territory half-pix filtering.

A kind of compressed domain video half-pix filtering method can improve video quality, reduces the computation complexity of vision operation, and its step is as follows:

1) the half-pix filtering method that adopts according to the choice of location of extracting piece;

2) with this half-pix filtering method to the filtering of compression domain coefficient, obtain corresponding half-pixel position compression domain coefficient.

Select the half-pix filtering method of employing according to the requirement of compressed domain video half-pix filtering.

To the filtering of compression domain coefficient, obtain corresponding half-pixel position compression domain coefficient with the half-pix filtering method.

Description of drawings:

Fig. 1 is an anti-motion compensation schematic diagram of the present invention.

Embodiment

Compressed domain video half-pix filtering problem as shown in Figure 1, known compression blocks B _i, i ∈ [1,2,3,4] will extract compression blocks from certain half-pixel position Obviously, can't directly extract compression blocks

Need extract compression blocks simply, fast by certain algorithm The present invention proposes a kind of half-pix filtering algorithm, promptly passes through B _iProduct, summation operation with the half-pix filtering method can achieve the above object, and solve the half-pix filtering problem.The concrete steps of half-pix filtering are:

1) according to extracting piece

The position, determine Same B ₁Relevant line number m, columns n; Line number m, columns n equal 0 or positive integer;

2), determine the filtering method that will adopt according to line number m, columns n;

3) according to extracting piece

With the correlation circumstance of adjacent block, determine related blocks;

4) use filtering method that related blocks is carried out filtering, obtain

If E ^s=1,2 ..., s}, wherein s is an integer, we at first define 1≤s≤8. two classes s * s and tie up sparse matrix $R_s={\left(R_s(i,j)\right)}_{i,j\∈E^s}\mathrm{and}{L}_s={\left(L_s(i,j)\right)}_{i,j\∈E^s},$ Wherein

The definition matrix:

$P_m=\left[\begin{array}{cc}0& R_m\\ 0& 0\end{array}\right]$

$P_n=\left[\begin{array}{cc}0& 0\\ L_n& 0\end{array}\right]$

P _m, P _nCorresponding dct transform result is

H _m＝DCT(P _m)

H _n＝DCT(P _n)

H _m, H _nBe compression domain half-pix filtering method, according to extracting piece

These two filtering methods of position grouping, respectively to B _i, i=1,2,3,4 carry out filtering, and with the filtering results added, just obtain

The compression domain coefficient.

Compressed domain video half-pix filtering method of the present invention can improve video quality, and reduction is looked Frequently the computation complexity that operates. Feature of the present invention is: adopt according to the position selection of extracting piece The half-pix filtering method; To the filtering of compression domain coefficient, obtain corresponding half with this half-pix filtering method Location of pixels compression domain coefficient. The present invention acts on compression domain, can carry out filtering to the compression domain coefficient, And do not rely on video compression standard.

Claims (5)

1. a compressed domain video half-pix filtering method can improve video quality, reduces the computation complexity of vision operation, and its step is as follows:

1) the half-pix filtering method that adopts according to the choice of location of extracting piece;

2) use the half-pix filtering method to the filtering of compression domain coefficient, obtain corresponding half-pixel position compression domain coefficient.

2. by the described compressed domain video half-pix of claim 1 filtering method, it is characterized in that: the half-pix filtering method of selecting employing according to the requirement of compressed domain video half-pix filtering.

3. by the described compressed domain video half-pix of claim 1 filtering method, it is characterized in that: to the filtering of compression domain coefficient, obtain corresponding half-pixel position compression domain coefficient with the half-pix filtering method.

4. the method for a video compression territory half-pix filtering, its step is as follows:

1) according to extracting piece The position, determine Same B ₁Relevant line number m, columns n; Line number m, columns n equal 0 or positive integer;

2), determine the filtering method that will adopt according to line number m, columns n;

3) according to extracting piece

With the correlation circumstance of adjacent block, determine related blocks;

4) use filtering method that related blocks is carried out filtering, obtain

5. by the method for the described video compression of claim 4 territory half-pix filtering, it is characterized in that: establish E ^s=1,2 ..., s}, wherein s is an integer, 1≤s≤8, we at first define two classes s * s and tie up sparse matrix $R_s=(R_s(i,j){)}_{i,j\∈E^s}\mathrm{and}{L}_s=(L_s(i,j){)}_{i,j\∈E^s},$ Wherein

The definition matrix:

$P_m=\left[\begin{array}{cc}0& R_m\\ 0& 0\end{array}\right]$

$P_n=\left[\begin{array}{cc}0& 0\\ L_n& 0\end{array}\right]$

P _m, P _nCorresponding dct transform result is

H _m＝DCT(P _m)

H _n＝DCT(P _n)

H _m, H _nBe compression domain half-pix filtering method, according to extracting piece These two filtering methods of position grouping, respectively to B _i, i=1,2,3,4 carry out filtering, and with the filtering results added, just obtain The compression domain coefficient.

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