CN101986711A - 1/8 pixel precision interpolation method and interpolation device - Google Patents
1/8 pixel precision interpolation method and interpolation device Download PDFInfo
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Abstract
The invention discloses a 1/8 pixel precision interpolation method. The method comprises the following steps: setting the category of sub-pixels and the positions of the sub-pixels; selecting integer pixels in the (M+5)*(N+5) integer pixel block which is nearest to the sub-pixel block composed of the sub-pixels, as the reference pixels from the original reference frame, and performing interpolation according to the set positions of different categories of sub-pixels to obtain the sub-pixels. In the method of the invention, interpolation is performed to the positions of all the sub-pixels, only integer pixels are used as the reference pixels, the interpolation process of the positions of the sub-pixels is simplified so as to reduce the time delay of the interpolation process; and the precision of motion vector can achieve 1/8 pixel precision in motion compensation, the prediction precision can be increased, the code rate can be reduced and the compression efficiency of video coding can be increased.
Description
Technical field
The present invention relates to technical field of video coding, particularly a kind of interpolation method of 1/8 pixel precision and interpolating apparatus.
Background technology
Most of now video encoding standard (as H.261, H.263, H.264, MPEG-1, MPEG-2, MPEG-4, AVS) all adopt hybrid encoding frame, technology such as integrated use prediction, conversion, entropy coding realize the compression of videos in cataloged procedure.
Usually video data is divided into intracoded frame and inter-frame encoding frame in the existing video coding technique.Generally speaking, in the process that the data in the inter-frame encoding frame are encoded, at first in reference frame, adopt the motion search technology to find reference data, motion vector is encoded the position of instruction decoding end reference data in reference frame.Adopt the motion compensation of whole pixel precision in the video encoding standard at initial stage, as H.261.Now video encoding standard adopts the motion compensation that divides pixel precision, has introduced the motion compensation of 1/2 pixel precision in MPEG-1, MPEG-2, and H.263, MPEG-4, H.264 further introduced the motion compensation of 1/4 pixel precision.By facts have proved that high-precision motion compensation can make the compression efficiency of video coding be improved.
For the motion compensation of minute pixel precision, the reference data of branch pixel scale is to obtain by the reference data interpolation of putting in order pixel in the reference frame, and the bilinearity difference is used in the motion compensation of early stage 1/2 pixel precision usually.H.264 the motion compensation of 1/4 pixel precision has then adopted Weiner filter to carry out interpolation in.Yet interpolation process complexity in the image element interpolation method now, thus cause the time delay of interpolation process bigger, being unfavorable for motion compensation, the compression efficiency of video coding is low.
Summary of the invention
Purpose of the present invention is intended to solve at least one of above-mentioned technological deficiency, a kind of interpolation method of 1/8 pixel precision is provided especially, this method can reduce the time delay of the interpolation process of obtaining the branch pixel, and helps motion compensation, reduces code check and improve the compression efficiency of video coding.
Another object of the present invention is to provide a kind of interpolating apparatus of 1/8 pixel precision.
For this reason, the embodiment of first aspect present invention has proposed a kind of interpolation method of 1/8 pixel precision, comprise the steps: to be provided with the position of branch pixel classification and described minute pixel, pixel comprised in described minute: half-pix point, 1/4 pixel and 1/8 pixel, wherein, described half-pix point comprises a class half-pix point and 2 class half-pix points, a described class half-pix point for described whole pixel at half-pix point with delegation or same row, described 2 class half-pix points are the interior residue half-pix point of described half-pix point;
Described 1/4 pixel comprises a class 1/4 pixel, two classes, 1/4 pixel and three classes, 1/4 pixel, a described class 1/4 pixel be with described whole pixel in 1/4 pixel with delegation or same row, described two classes, 1/4 pixel be simultaneously with a described class half-pix point and 2 class half-pix points with delegation or while and a described class half-pix point and 2 class half-pix points 1/4 pixel at same row, described three classes, 1/4 pixel is interior residue 1/4 pixel of described 1/4 pixel;
Described 1/8 pixel comprises a class 1/8 pixel, two classes, 1/8 pixel, three classes, 1/8 pixel, four classes, 1/8 pixel, five classes, 1/8 pixel, six classes, 1/8 pixel, seven classes, 1/8 pixel, eight classes, 1/8 pixel and nine classes, 1/8 pixel, and a described class 1/8 pixel is 1/8 pixel between described whole pixel and a class 1/4 pixel; Described two classes, 1/8 pixel is 1/8 pixel between a described class half-pix point and a class 1/4 pixel, described three classes, 1/8 pixel is 1/8 pixel between a described class 1/4 pixel and three classes, 1/4 pixel, described four classes, 1/8 pixel is 1/8 pixel between a described class half-pix point and two classes, 1/4 pixel, described five classes, 1/8 pixel is 1/8 pixel between three classes, 1/4 pixel and two classes, 1/4 pixel, described six classes, 1/8 pixel is 1/8 pixel between described two classes, 1/4 pixel and 2 class half-pix points, described seven classes, 1/8 pixel is 1/8 pixel between a described class 1/8 pixel and three classes, 1/8 pixel, described eight classes, 1/8 pixel is for being positioned at described two classes, 1/8 pixel, three classes, 1/8 pixel, four classes, 1/8 pixel, 1/8 pixel between five classes, 1/8 pixel, described nine classes, 1/8 pixel are 1/8 pixel between five classes, 1/8 pixel and six classes, 1/8 pixel; And
From the original reference frame, choose whole pixel in nearest (M+5) * (N+5) the whole block of pixels of the branch block of pixels that constitutes with described minute pixel as the reference pixel, carry out interpolation according to the position of all kinds of minutes pixels that have been provided with and obtain described minute pixel, wherein, M is the number that every row divides pixel in the described minute block of pixels obtaining of interpolation, and N is the number that every row divide pixel in the described minute pixel obtaining of interpolation.
According to the interpolation method of 1/8 pixel precision of the embodiment of the invention, for all branch location of pixels interpolation, only need use whole pixel as the reference pixel, simplify interpolation process in the branch location of pixels, thereby reduced the time delay of interpolation process.Adopt high-precision interpolation filter simultaneously, in motion compensation, can make motion vector be accurate to 1/8 Pixel-level, improve precision of prediction, reduce code check, and improve the compression efficiency of video coding.
The embodiment of a second aspect of the present invention has proposed a kind of interpolating apparatus of 1/8 pixel precision, comprising: acquisition module is used for obtaining as the whole pixel with reference to pixel from the original reference frame; The image element interpolation module, described image element interpolation module is connected with described acquisition module, be used to receive from the whole pixel of described acquisition module and to described whole pixel and carry out interpolation to obtain the branch pixel, pixel comprised in described minute: half-pix point, 1/4 pixel and 1/8 pixel, the pixel interpolating module comprised in described minute: a class half-pix interpolating unit, be used for interpolation and obtain a class half-pix point, a described class half-pix point for described whole pixel at half-pix point with delegation or same row; Two class half-pix interpolating unit are used for interpolation and obtain 2 class half-pix points, and described 2 class half-pix points are the residue half-pix point in the described half-pix point; One class, 1/4 picture element interpolation unit is used for interpolation and obtains a class 1/4 pixel, a described class 1/4 pixel be with described whole pixel in 1/4 pixel with delegation or same row; Two classes, 1/4 picture element interpolation unit, be used for interpolation and obtain two classes, 1/4 pixel, described two classes, 1/4 pixel be simultaneously with a described class half-pix point and 2 class half-pix points with delegation or while and a described class half-pix point and 2 class half-pix points 1/4 pixel at same row; Three classes, 1/4 picture element interpolation unit is used for interpolation and obtains three classes, 1/4 pixel, and described three classes, 1/4 pixel is residue 1/4 pixel in described 1/4 pixel; One class, 1/8 picture element interpolation unit is used for interpolation and obtains a class 1/8 pixel, and a described class 1/8 pixel is 1/8 pixel between described whole pixel and a class 1/4 pixel; Two classes, 1/8 picture element interpolation unit is used for interpolation and obtains two classes, 1/8 pixel, and described two classes, 1/8 pixel is 1/8 pixel between a described class half-pix point and a class 1/4 pixel; Three classes, 1/8 picture element interpolation unit is used for interpolation and obtains three classes, 1/8 pixel, and described three classes, 1/8 pixel is 1/8 pixel between a described class 1/4 pixel and three classes, 1/4 pixel; Four classes, 1/8 picture element interpolation unit is used for interpolation and obtains four classes, 1/8 pixel, and described four classes, 1/8 pixel is 1/8 pixel between a described class half-pix point and two classes, 1/4 pixel; Five classes, 1/8 picture element interpolation unit is used for interpolation and obtains five classes, 1/8 pixel, and described five classes, 1/8 pixel is 1/8 pixel between three classes, 1/4 pixel and two classes, 1/4 pixel; Six classes, 1/8 picture element interpolation unit is used for interpolation and obtains six classes, 1/8 pixel, and described six classes, 1/8 pixel is 1/8 pixel between described two classes, 1/4 pixel and 2 class half-pix points; Seven classes, 1/8 picture element interpolation unit is used for interpolation and obtains seven classes, 1/8 pixel, and described seven classes, 1/8 pixel is 1/8 pixel between a described class 1/8 pixel and three classes, 1/8 pixel; Eight classes, 1/8 picture element interpolation unit is used for interpolation and obtains eight classes, 1/8 pixel, and described eight classes, 1/8 pixel is 1/8 pixel between described two classes, 1/8 pixel, three classes, 1/8 pixel, four classes, 1/8 pixel, five classes, 1/8 pixel; Nine classes, 1/8 picture element interpolation unit is used for interpolation and obtains nine classes, 1/8 pixel, and described nine classes, 1/8 pixel is 1/8 pixel between five classes, 1/8 pixel and six classes, 1/8 pixel; And output module, described output module links to each other with described image element interpolation module, is used to export the branch pixel value of the branch pixel that interpolation obtains.
According to the interpolating apparatus of 1/8 pixel precision of the embodiment of the invention, for all branch location of pixels interpolation, only need use whole pixel as the reference pixel, simplify interpolation process in the branch location of pixels, thereby reduced the time delay of interpolation process.The interpolating apparatus of the embodiment of the invention adopts high-precision interpolation filter simultaneously, can make motion vector be accurate to 1/8 Pixel-level in motion compensation, improves precision of prediction, reduces code check, and improves the compression efficiency of video coding.
Aspect that the present invention adds and advantage part in the following description provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Description of drawings
Above-mentioned and/or additional aspect of the present invention and advantage are from obviously and easily understanding becoming the description of embodiment below in conjunction with accompanying drawing, wherein:
Fig. 1 is the FB(flow block) according to the interpolation method of 1/8 pixel precision of the embodiment of the invention;
Fig. 2 is according to the whole pixel distribution schematic diagram of the embodiment of the invention as the reference pixel;
Fig. 3 is according to the branch pixel of the embodiment of the invention and the distribution schematic diagram of whole pixel;
Fig. 4 is the structural representation according to the interpolating apparatus of 1/8 pixel precision of the embodiment of the invention; And
Fig. 5 is the structural representation of image element interpolation module among Fig. 4.
Embodiment
Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, and wherein identical from start to finish or similar label is represented identical or similar elements or the element with identical or similar functions.Below by the embodiment that is described with reference to the drawings is exemplary, only is used to explain the present invention, and can not be interpreted as limitation of the present invention.
As shown in Figure 1,1/8 pixel precision interpolation method according to the embodiment of the invention comprises the steps:
S101: the position that branch pixel classification and described minute pixel are set;
Divide pixel to comprise 3 big classes, comprise half-pix point, 1/4 pixel and 1/8 pixel.Half-pix point, 1/4 pixel and 1/8 pixel segment classification separately again, can be divided into 14 groups altogether.
Particularly, as shown in Figure 3, the half-pix point comprises a class half-pix point and 2 class half-pix points.
(1) one class half-pix point for whole pixel at half-pix point, as a5, e1 with delegation or same row;
(2) two class half-pix points are the interior residue half-pix point of described half-pix point, i.e. other half-pix points except a class half-pix point are as e5;
1/4 pixel comprises a class 1/4 pixel, two classes, 1/4 pixel and three classes, 1/4 pixel.
(3) one classes 1/4 pixel is and puts in order pixel in 1/4 pixel with delegation or same row, as a3, a7, c1, g1;
(4) two classes 1/4 pixel be simultaneously with a class half-pix point and 2 class half-pix points with delegation or while and a class half-pix point and 2 class half-pix points 1/4 pixel at same row, as c5, e3, e7, g5;
(5) three classes 1/4 pixel is residue 1/4 pixel in 1/4 pixel, i.e. 1/4 pixel except a class 1/4 pixel and two classes, 1/4 pixel is as c3, c7, g3, g7;
1/8 pixel comprises a class 1/8 pixel, two classes, 1/8 pixel, three classes, 1/8 pixel, four classes, 1/8 pixel, five classes, 1/8 pixel, six classes, 1/8 pixel, seven classes, 1/8 pixel, eight classes, 1/8 pixel and nine classes, 1/8 pixel.
(6) one classes 1/8 pixel is 1/8 pixel between whole pixel and a class 1/4 pixel, as a2, a8, b1, h1;
(7) two classes 1/8 pixel is 1/8 pixel between a class half-pix point and a class 1/4 pixel, as a4, a6, d1, f1;
(8) three classes 1/8 pixel is 1/8 pixel between a class 1/4 pixel and three classes, 1/4 pixel, as b3, b7, c2, c8, g2, g8, h2, h8;
(9) four classes 1/8 pixel is 1/8 pixel between a class half-pix point and two classes, 1/4 pixel, as b5, e2, e8, h5;
(10) five classes 1/8 pixel is 1/8 pixel between three classes, 1/4 pixel and two classes, 1/4 pixel, as c4, c6, d3, d7, f3, f7, g4, g6;
(11) six classes 1/8 pixel is 1/8 pixel between two classes, 1/4 pixel and 2 class half-pix points, as d5, e4, e6, f5;
(12) seven classes 1/8 pixel is 1/8 pixel between a class 1/8 pixel and three classes, 1/8 pixel, as b2, b8, g2, g8;
(13) eight classes 1/8 pixel is 1/8 pixel between two classes, 1/8 pixel, three classes, 1/8 pixel, four classes, 1/8 pixel, five classes, 1/8 pixel, as b4, b6, d2, d8, f2, f8, h4, h6;
(14) nine classes 1/8 pixel is 1/8 pixel between five classes, 1/8 pixel and six classes, 1/8 pixel, as d4, d6, f4, f6.
As can be seen from Figure 3, the symmetry that has of same group other minute pixel.For instance, belong to the d4 and the d6 in the vertical direction symmetry of nine classes, 1/8 pixel, belong to d5 and e4 symmetry on diagonal of six classes, 1/8 pixel.
S102: obtain whole pixel, carry out interpolation to obtain the branch pixel according to the position of all kinds of minutes pixels that have been provided with.
From the original reference frame, choose whole pixel in nearest (M+5) * (N+5) the whole block of pixels of branch block of pixels that the branch pixel that obtains with interpolation constitutes as the reference pixel, and carry out interpolation according to the position of all kinds of minutes pixels that have been provided with and obtain the branch pixel, wherein, M is the number that every row divides pixel in the branch block of pixels obtained of interpolation, and N is the number that every row divide pixel in the branch pixel that obtains of interpolation.In one embodiment of the invention, M=1, N=1.Thus, for above-mentioned minute location of pixels, adopt 6 * 6 whole pixels nearest to carry out interpolation as the reference pixel apart from institute's interpolation branch pixel.Fig. 2 shows 6 * 6 whole block of pixels, A1～A6 wherein, and B1～B6, C1～C6, D1～D6, E1～E6, F1～F6 are whole pixel.
Utilize interpolation filter to obtain all kinds of minutes pixels.For the interpolation of different branch location of pixels, the tap coefficient of the interpolation filter part filter of employing is 0, can omit corresponding tap when realizing, thereby the interpolation filter of the actual branch location of pixels of realizing is the filter that is less than 36 taps.And each class divides the filter tap coefficients sum of pixel correspondence to be 256.
Respectively the interpolation of the branch pixel of each group is obtained below and be specifically described.
(1) one class half-pix point by tap coefficient be 0,0,0,0,0,0}, { 1,-3,2,2 ,-3,1}, { 5,-27,150,150 ,-27,5}, { 1,-3,2,2 ,-3,1}, { 0,0,0,0,0,0}, { 0,0,0,0,0,0, the filter of 18 taps of 0}} or this filter is carried out the filter interpolation that symmetry transformation obtains obtain.Wherein,
a5＝(1*B1+(-3)*B2+2*B3+2*B4+(-3)*B5+2*B6+5*C1+(-27)*C2+150*C3+150*C4+(-27)*C5+5*C6+1*D1+(-3)*D2+2*D3+2*D4+(-3)*D5+1*D6)/256。
e1＝(1*A2+5*A3+1*A4+(-3)*B2+(-27)*B3+(-3)*B4+2*C2+150*C3+2*C4+2*D2+150*D3+2*D4+(-3)*E2+(-27)*E3+(-2)*E4+1*F2+5*F3+1*F4)/256。
(2) two class half-pix points by tap coefficient are
0,0,3,3,0,0}, 0,0 ,-16 ,-16,0,0}, 3 ,-16,90,90 ,-16,3}, 3 ,-16,90,90 ,-16,3}, 0,0 ,-16 ,-16,0,0}, 0,0,3,3,0, the filter of 20 taps of 0}} or it is carried out the filter interpolation that symmetry transformation obtains obtain.Wherein,
e5＝(3*A3+3*A4+(-16)*B3+(-16)*B4+3*C1+(-16)*C2+90*C3+90*C4+(-16)*C5+3*C6+3*D1+(-16)*D2+90*D3+90*D4+(-16)*D5+3*D6+(-16)*E3+(-16)*E4+3*F3+3*F4)/256。
(3) one classes 1/4 pixel by tap coefficient is
0,0,0,0,0,0}, 1 ,-2,1,1 ,-2,1}, 5 ,-27,223,67 ,-14,2}, and 1 ,-2,1,1 ,-2,1}, 0,0,0,0,0,0}, and 0,0,0,0,0, the filter of 18 taps of 0}} or it is carried out the filter interpolation that symmetry transformation obtains obtain.Wherein,
a3＝(1*B1+(-2)*B2+1*B3+1*B4+(-2)*B5+1*B6+5*C1+(-27)*C2+223*C3+67*C4+(-14)*C5+2*C6+1*D1+(-2)*D2+1*D3+1*D4+(-2)*D5+1*D6)/256。
a7＝(1*B1+(-2)*B2+1*B3+1*B4+(-2)*B5+1*B6+2*C1+(-14)*C2+67*C3+223*C4+(-27)*C5+5*C6+1*D1+(-2)*D2+1*D3+1*D4+-2*D5+1*D6)/256。
c1＝(1*A2+5*A3+1*A4+(-2)*B2+(-27)*B3+(-2)*B3+1*C2+223*C3+1*C4+1*D2+67*D3+1*D4+(-2)*E2+(-14)*E3+(-2)*E4+1*F2+2*F3+1*F4)/256。
g1＝(1*A2+2*A3+1*A4+(-2)*B2+(-14)*B3+(-2)*B4+1*C2+67*C3+1*C4+1*D2+223*D3+1*D4+(-2)*E2+(-27)*E3+(-2)*E4+1*F2+5*F3+1*F4)/256。
(4) two classes 1/4 pixel by tap coefficient be 0,0,3,3,0,0}, 0,0 ,-15 ,-15,0,0}, 4 ,-23,132,132 ,-23,4}, 2 ,-9,41,41 ,-9,2}{0,0 ,-9 ,-9,0,0}, { 0,0,2,2,0, the filter of 20 taps of 0}} or it is carried out the filter interpolation that symmetry transformation obtains obtain.Wherein,
c5＝(3*A3+3*A4+(-15)*B3+(-15)*B4+4*C1+(-23)*C2+132*C3+132*C4+(-23)*C5+4*C6+2*D1+(-9)*D2+41*D3+41*D4+(-9)*D5+2*D6+(-9)*E3+(-9)*E4+2*F3+2*F4)/256。
e3＝(4*A3+2*A4+(-23)*B3+(-9)*B4+3*C1+(-15)*C2+132*C3+41*C4+(-9)*C5+2*C6+3*D1+(-15)*D2+132*D3+41*D4+(-9)*D5+2*D6+(-23)*E3+(-9)*E4+4*F3+2*F4)/256。
(5) three classes 1/4 pixel by tap coefficient is
0,0,4,2,0,0}, 0,0 ,-23 ,-8,0,0}, 4 ,-23,194,60 ,-12,2}, 2 ,-8,60,20 ,-5,1}, 0,0 ,-12 ,-5,0,0}, 0,0,2,1,0, the filter of 20 taps of 0}} or this filter is carried out the filter interpolation that symmetry transformation obtains obtain.Wherein,
c3＝(4*A3+2*A4+(-23)*B3+(-8)*B4+4*C1+(-23)*C2+194*C3+60*C4+(-12)*C5+2*C6+2*D1+(-8)*D2+60*D3+20*D4+(05)*D5+1*D6+(-12)*E3+(-5)*E4+2*F3+1*F4)/256。
c7＝(2*A3+4*A4+(-8)*B3+(-23)*B4+2*C1+(-12)*C2+60*C3+194*C4+(-23)*C5+4*C6+1*D1+(-5)*D2+20*D3+60*D4+(-8)*D5+2*D6+(-5)*E3+(-12)*E4+1*F3+2*F4)/256。
g3＝(2*A3+1*A4+(-12)*B3+(-5)*B4+2*C1+(-8)*C2+60*C3+20*C4+(-5)*C5+1*C6+4*D1+(-23)*D2+194*D3+60*D4+(-12)*D5+2*D6+(-23)*E3+(-8)*E4+4*F3+2*F4)/256。
g7＝(1*A3+2*A4+(-5)*B3+(-12)*B4+1*C1+(-5)*C2+20*C3+60*C4+(-8)*C5+2*C6+2*D1+(-12)*D2+60*D3+194*D4+(-23)*D5+4*D6+(-8)*E3+(-23)*E4+2*F3+4*F4)/256。
(6) one classes 1/8 pixel by tap coefficient is
0,0,0,0,0,0}, 0 ,-1,1,1 ,-1,0}, 3 ,-18,246,30 ,-6,1}, and 0 ,-1,1,1 ,-1,0}, 0,0,0,0,0,0}, and 0,0,0,0,0, the filter of 14 taps of 0}} or this filter is carried out the filter interpolation that symmetry transformation obtains obtain.Wherein, a2=((1) * B2+1*B3+1*B4+ (1) * B5+3*C1+ (18) * C2+246*C3+30*C4+ (6) * C5+1*C6+ (1) * D2+1*D3+1*D4+ (1) * D5)/256.
a8＝((-1)*B2+1*B3+1*B4+(-1)*B5+1*C1+(-6)*C2+30*C3+246*C4+(-18)*C5+3*C6+(-1)*D2+1*D3+1*D4+(-1)*D5)/256。
b1＝(3*A3+(-1)*B2+(-18)*B3+(-1)*B4+1*C2+246*C3+1*C4+1*D2+30*D3+1*D4+(-1)*E2+(-6)*E3+(-1)*E4+1*F3)/256。
h1＝(1*A3+(-1)*B2+(-6)*B3+(-1)*B4+1*C2+30*C3+1*C4+1*D2+246*D3+1*D4+(-1)*E2+(-18)*E3+(-1)*E4+3*F3)/256。
(7) two classes 1/8 pixel by tap coefficient is
0,0,0,0,0,0}, 1 ,-3,2,1 ,-2,1}, 5 ,-29,189,108 ,-21,4}, 1 ,-3,2,1 ,-2,1}, 0,0,0,0,0,0}, 0,0,0,0,0, the filter of 18 taps of 0}} or this filter is carried out the filter interpolation that symmetry transformation obtains obtain.Wherein,
a4＝(1*B1+(-3)*B2+2*B3+1*B4+(-2)*B5+1*B6+5*C1+(-29)*C2+189*C3+108*C4+(-21)*C5+4*C6+1*D1+(-3)*D2+2*D3+1*D4+(-2)*D5+1*D6)/256。
a6＝(1*B1+(-2)*B2+1*B3+2*B4+(-3)*B5+1*B6+4*C1+(-21)*C2+108*C3+189*C4+(-29)*C5+5*C6+1*D1+(-2)*D2+1*D3+2*D4+(-3)*D5+1*D6)/256。
d1＝(1*A2+5*A3+1*A4+(-3)*B2+(-29)*B3+(-3)*B4+2*C2+189*C3+2*C4+1*D2+108*D3+1*D4+(-2)*E2+(-21)*E3+(-2)*E4+1*F2+4*F3+1*F4)/256。
f1＝(1*A2+4*A3+1*A4+(-2)*B2+(-21)*B3+(-2)*B4+1*C2+108*C3+1*C4+2*D2+189*D3+2*D4+(-3)*E2+(-29)*E3+(-3)*E4+1*F2+5*F3+1*F4)/256。
(8) three classes 1/8 pixel by tap coefficient is
0,0,3,1,0,0}, 1 ,-1 ,-14 ,-4 ,-1,0}, 4 ,-25,214,65 ,-13,2}, 1 ,-5,27,9 ,-3,1}, 0,0 ,-6 ,-2,0,0}{0,0,1,1,0, the filter of 22 taps of 0}} or this filter is carried out the filter interpolation that symmetry transformation obtains obtain.Wherein,
b3＝(3*A3+1*A4+1*B1+(-1)*B2+(-14)*B3+(-4)*B4+(-1)*B5+4*C1+(-25)*C2+214*C3+65*C4+(-13)*C5+2*C6+1*D1+(-5)*D2+27*D3+9*D4+(-3)*D5+1*D6+(-6)*E3+(-2)*E4+1*F3+1*F4)/256。
b7＝(1*A3+3*A4+(-1)*B2+(-4)*B3+(-14)*B4+(-1)*B5+1*B6+2*C1+(-13)*C2+65*C3+214*C4+(-25)*C5+4*C6+1*D1+(-3)*D2+9*D3+27*D4+(-5)*D5+1*D6+(-2)*E3+(-6)*E4+1*F3+1*F4)/256。
c2＝(1*A2+4*A3+1*A4+(-1)*B2+(-25)*B3+(-5)*B4+3*C1+(-14)*C2+214*C3+27*C4+(-6)*C5+1*C6+1*D1+(-4)*D2+65*D3+9*D4+(-2)*D5+1*D6+(-1)*E2+(-13)*E3+(-3)*E4+2*F3+1*F4)/256。
c8＝(1*A3+4*A4+1*A5+(-5)*B3+(-25)*B4+(-1)*B5+1*C1+(-6)*C2+27*C3+214*C4+(-14)*C5+3*C6+1*D1+(-2)*D2+9*D3+65*D4+(-4)*D5+1*D6+(-3)*E3+(-13)*E4+(-1)*E5+1*F3+2*F4)/256。
g2＝(2*A3+1*A4+(-1)*B2+(-13)*B3+(-3)*B4+1*C1+(-4)*C2+65*C3+9*C4+(-2)*C5+1*C6+3*D1+(-14)*D2+214*D3+27*D4+(-6)*D5+1*D6+(-1)*E2+(-25)*E3+(-5)*E4+1*F2+4*F3+1*F4)/256。
g8＝(1*A3+2*A4+(-3)*B3+(-13)*B4+(-1)*B5+1*C1+(-2)*C2+9*C3+65*C4+(-4)*C5+1*C6+1*D1+(-6)*D2+27*D3+214*D4+(-14)*D5+3*D6+(-5)*E3+(-25)*E4+(-1)*E5+1*F3+4*F4+1*F5)/256。
h3＝(1*A3+1*A4+(-6)*B3+(-2)*B4+1*C1+(-5)*C2+27*C3+9*C4+(-3)*C5+1*C6+4*D1+(-25)*D2+214*D3+65*D4+(-13)*D5+2*D6+1*E1+(-1)*E2+(-14)*E3+(-4)*E4+(-1)*E5+3*F3+1*F4)/256。
h7＝(1*A3+1*A4+(-2)*B3+(-6)*B4+1*C1+(-3)*C2+9*C3+27*C4+(-5)*C5+1*C6+2*D1+(-13)*D2+65*D3+214*D4+(-25)*D5+4*D6+(-1)*E2+(-4)*E3+(-14)*E4+(-1)*E5+1*E6+1*F3+3*F4)/256。
(9) four classes 1/8 pixel by tap coefficient is
0,0,2,2,0,0}, 1 ,-1 ,-9 ,-9 ,-1,1}, 4 ,-26,145,145 ,-26,4}, 1 ,-5,19,19 ,-5,1}, 0,0 ,-4 ,-4,0,0}, 0,0,1,1,0, the filter of 24 taps of 0}} or this filter is carried out the filter interpolation that symmetry transformation obtains obtain.Wherein,
b5＝(2*A3+2*A4+1*B1+(-1)*B2+(-9)*B3+(-9)*B4+(-1)*B5+1*B6+4*C1+(-26)*C2+145*C3+145*C4+(-26)*C5+4*C6+1*D1+(-5)*D2+19*D3+19*D4+(-5)*D5+1*D6+(-4)*E3+(-4)*E4+1*F3+1*F4)/256。
e2＝(1*A2+4*A3+1*A4+(-1)*B2+(-26)*B3+(-5)*B4+2*C1+(-9)*C2+145*C3+19*C4+(-4)*C5+1*C6+2*D1+(-9)*D2+145*D3+19*D4+(-4)*D5+1*D6+(-1)*E2+(-26)*E3+(-5)*E4+1*F2+4*F3+1*F4)/256。
e8＝(1*A3+4*A4+1*A5+(-5)*B3+(-26)*B4+(-1)*B5+1*C1+(-4)*C2+19*C3+145*C4+(-9)*C5+2*C6+1*D1+(-4)*D2+19*D3+145*D4+(-9)*D5+2*D6+(-5)*E3+(-26)*E4+(-1)*E5+1*F3+4*F4+1*F5)/256。
h5＝(1*A3+1*A4+(-4)*B3+(-4)*B4+1*C1+(-5)*C2+19*C3+19*C4+(-5)*C5+1*C6+4*D1+(-26)*D2+145*D3+145*D4+(-26)*D5+4*D6+1*E1+(-1)*E2+(-9)*E3+(-9)*E4+(-1)*E5+1*E6+2*F3+2*F4)/256。
(10) five classes 1/8 pixel by tap coefficient is
0,0,4,2,0,0}, 0,0 ,-19 ,-11,0,0}, 4 ,-25,166,95 ,-18,3}, 2 ,-9,51,31 ,-7,2}, 0,0 ,-11 ,-7,0,0}, 0,0,2,1,0, the filter of 20 taps of 0}} or this filter is carried out the filter interpolation that symmetry transformation obtains obtain.Wherein,
c4＝(4*A3+2*A4+(-19)*B3+(-11)*B4+4*C1+(-25)*C2+166*C3+95*C4+(-18)*C5+3*C6+2*D1+(-9)*D2+51*D3+31*D4+(-7)*D5+2*D6+(-11)*E3+(-7)*E4+2*F3+1*F4)/256。
c6＝(2*A3+4*A4+(-11)*B3+(-19)*B4+3*C1+(-18)*C2+95*C3+166*C4+(-25)*C5+4*C6+2*D1+(-7)*D2+31*D3+51*D4+(-9)*D5+2*D6+(-7)*E3+(-11)*E4+1*F3+2*F4)/256。
d3＝(4*A3+2*A4+(-25)*B3+(-9)*B4+4*C1+(-19)*C2+166*C3+51*C4+(-11)*C5+2*C6+2*D1+(-11)*D2+95*D3+31*D4+(-7)*D5+1*D6+(-18)*E3+(-7)*E4+3*F3+2*F4)/256。
d7＝(2*A3+4*A4+(-9)*B3+(-25)*B4+2*C1+(-11)*C2+51*C3+166*C4+(-19)*C5+4*C6+1*D1+(-7)*D2+31*D3+95*D4+(-11)*D5+2*D6+(-7)*E3+(-18)*E4+2*F3+3*F4)/256。
f3＝(3*A3+2*A4+(-18)*B3+(-7)*B4+2*C1+(-11)*C2+95*C3+31*C4+(-7)*C5+1*C6+4*D1+(-19)*D2+166*D3+51*D4+(-11)*D5+2*D6+(-25)*E3+(-9)*E4+4*F3+2*F4)/256。
f7＝(2*A3+3*A4+(-7)*B3+(-18)*B4+1*C1+(-7)*C2+31*C3+95*C4+(-11)*C5+2*C6+2*D1+(-11)*D2+51*D3+166*D4+(-19)*D5+4*D6+(-9)*E3+(-25)*E4+2*F3+4*F4)/256。
g4＝(2*A3+1*A4+(-11)*B3+(-7)*B4+2*C1+(-9)*C2+51*C3+31*C4+(-7)*C5+2*C6+4*D1+(-25)*D2+166*D3+95*D4+(-18)*D5+3*D6+(-19)*E3+(-11)*E4+4*F3+2*F4)/256。
g6＝(1*A3+2*A4+(-7)*B3+(-11)*B4+2*C1+(-7)*C2+31*C3+51*C4+(-9)*C5+2*C6+3*D1+(-18)*D2+95*D3+166*D4+(-25)*D5+4*D6+(-11)*E3+(-19)*E4+2*F3+4*F4)/256。
(11) six classes 1/8 pixel by tap coefficient is
0,0,3,3,0,0}, 0,0 ,-17 ,-17,0,0}, 4 ,-20,113,113 ,-20,4}, 2 ,-12,66,66 ,-12,2}, 0,0 ,-13 ,-13,0,0}, 0,0,2,2,0, the filter of 20 taps of 0}} or this filter is carried out the filter interpolation that symmetry transformation obtains obtain.Wherein,
d5＝(3*A3+3*A4+(-17)*B3+(-17)*B4+4*C1+(-20)*C2+113*C3+113*C4+(-20)*C5+4*C6+2*D1+(-12)*D2+66*D3+66*D4+(-12)*D5+2*D6+(-13)*E3+(-13)*E4+2*F3+2*F4)/256。
e4＝(4*A3+2*A4+(-20)*B3+(-12)*B4+3*C1+(-17)*C2+113*C3+66*C4+(-13)*C5+2*C6+3*D1+(-17)*D2+113*D3+66*D4+(-13)*D5+2*D6+(-20)*E3+(-12)*E4+4*F3+2*F4)/256。
e6＝(2*A3+4*A4+(-12)*B3+(-20)*B4+2*C1+(-13)*C2+66*C3+113*C4+(-17)*C5+3*C6+2*D1+(-13)*D2+66*D3+113*D4+(-17)*D5+3*D6+(-12)*E3+(-20)*E4+2*F3+4*F4)/256。
f5＝(2*A3+2*A4+(-13)*B3+(-13)*B4+2*C1+(-12)*C2+66*C3+66*C4+(-12)*C5+2*C6+4*D1+(-20)*D2+113*D3+113*D4+(-20)*D5+4*D6+(-17)*E3+(-17)*E4+3*F3+3*F4)/256。
(12) seven classes 1/8 pixel by tap coefficient is
0,0,3,1,0,0}, 0 ,-1 ,-17 ,-2,0,0}, 3 ,-17,237,29 ,-6,1}, 1 ,-2,29,5 ,-2,0}, 0,0 ,-6 ,-1,0,0}, 0,0,1,0,0, the filter of 19 taps of 0}} or this filter is carried out the filter interpolation that symmetry transformation obtains obtain.Wherein,
b2＝(3*A3+1*A4+(-1)*B2+(-17)*B3+(-2)*B4+3*C1+(-17)*C2+237*C3+29*C4+(-6)*C5+1*C6+1*D1+(-2)*D2+29*D3+5*D4+(-2)*D5+(-6)*E3+(-1)*E4+1*F3)/256。
b8＝(1*A3+3*A4+(-2)*B3+(-17)*B4+(-1)*B5+1*C1+(-6)*C2+29*C3+237*C4+(-17)*C5+3*C6+(-1)*D2+5*D3+29*D4+(-2)*D5+1*D6+(-2)*E3+(-6)*E4+1*F4)/256。
h2＝(1*A3+(-6)*B3+(-1)*B4+1*C1+(-2)*C2+29*C3+5*C4+(-2)*C5+3*D1+(-17)*D2+237*D3+29*D4+(-6)*D5+1*D6+(-1)*E2+(-17)*E3+(-2)*E4+3*F3+1*F4)/256。
h8＝(1*A4+(-2)*B3+(-6)*B4+(-1)*C2+5*C3+29*C4+(-2)*C5+1*C6+1*D1+(-6)*D2+29*D3+237*D4+(-17)*D5+3*D6+(-2)*E3+(-17)*E4+(-1)*E5+1*F3+3*F4)/256。
(13) eight classes 1/8 pixel by tap coefficient is
0,0,2,1,0,0}, 1 ,-1 ,-12 ,-7 ,-1,0}, 5 ,-28,182,105 ,-20,4}, 1 ,-5,24,15 ,-5,1}, 0,0 ,-5 ,-3,0,0}, 0,0,1,1,0, the filter of 23 taps of 0}} or this filter is carried out the filter interpolation that symmetry transformation obtains obtain.Wherein,
b4＝(2*A3+1*A4+1*B1+(-1)*B2+(-12)*B3+(-7)*B4+(-1)*B5+5*C1+(-28)*C2+182*C3+105*C4+(-20)*C5+4*C6+1*D1+(-5)*D2+24*D3+15*D4+(-5)*D5+1*D6+(-5)*E3+(-3)*E4+1*F3+1*F4)/256。
b6＝(1*A3+2*A4+(-1)*B2+(-7)*B3+(-12)*B4+(-1)*B5+1*B6+4*C1+(-20)*C2+105*C3+182*C4+(-28)*C5+5*C6+1*D1+(-5)*D2+15*D3+24*D4+(-5)*D5+1*D6+(-3)*E3+(-5)*E4+1*F3+1*F4)/256。
d2＝(1*A2+5*A3+1*A4+(-1)*B2+(-28)*B3+(-5)*B4+2*C1+(-12)*C2+182*C3+24*C4+(-5)*C5+1*C6+1*D1+(-7)*D2+105*D3+15*D4+(-3)*D5+1*D6+(-1)*E2+(-20)*E3+(-5)*E4+4*F3+1*F4)/256。
d8＝(1*A3+5*A4+1*A5+(-5)*B3+(-28)*B4+(-1)*B5+1*C1+(-5)*C2+24*C3+182*C4+(-12)*C5+2*C6+1*D1+(-3)*D2+15*D3+105*D4+(-7)*D5+1*D6+(-5)*E3+(-20)*E4+(-1)*E5+1*F3+4*F4)/256。
f2＝(4*A3+1*A4+(-1)*B2+(-20)*B3+(-5)*B4+1*C1+(-7)*C2+105*C3+15*C4+(-3)*C5+1*C6+2*D1+(-12)*D2+182*D3+24*D4+(-5)*D5+1*D6+(-1)*E2+(-28)*E3+(-5)*E4+1*F2+5*F3+1*F4)/256。
f8＝(1*A3+4*A4+(-5)*B3+(-20)*B4+(-1)*B5+1*C1+(-3)*C2+15*C3+105*C4+(-7)*C5+1*C6+1*D1+(-5)*D2+24*D3+182*D4+(-12)*D5+2*D6+(-5)*E3+(-28)*E4+(-1)*E5+1*F3+5*F4+1*F5)/256。
h4＝(1*A3+1*A4+(-5)*B3+(-3)*B4+1*C1+(-5)*C2+24*C3+15*C4+(-5)*C5+1*C6+5*D1+(-28)*D2+182*D3+105*D4+(-20)*D5+4*D6+1*E1+(-1)*E2+(-12)*E3+(-7)*E4+(-1)*E5+2*F3+1*F4)/256。
h6＝(1*A3+1*A4+(-3)*B3+(-5)*B4+1*C1+(-5)*C2+15*C3+24*C4+(-5)*C5+1*C6+4*D1+(-20)*D2+105*D3+182*D4+(-28)*D5+5*D6+(-1)*E2+(-7)*E3+(-12)*E4+(-1)*E5+1*E6+1*F3+2*F4)/256。
(14) nine classes 1/8 pixel by tap coefficient is
0,0,4,3,0,0}, 0,0 ,-21 ,-13,0,0}, 4 ,-21,141,82 ,-16,3}, 2 ,-13,82,48 ,-10,2}, 0,0 ,-16 ,-10,0,0}, 0,0,3,2,0, the filter of 20 taps of 0}} or this filter is carried out the filter interpolation that symmetry transformation obtains obtain.Wherein,
d4＝(4*A3+3*A4+(-21)*B3+(-13)*B4+4*C1+(-21)*C2+141*C3+82*C4+(-16)*C5+3*C6+2*D1+(-13)*D2+82*D3+48*D4+(-10)*D5+2*D6+(-16)*E3+(-10)*E4+3*F3+2*F4)/256。
d6＝(3*A3+4*A4+(-13)*B3+(-21)*B4+3*C1+(-16)*C2+82*C3+141*C4+(-21)*C5+4*C6+2*D1+(-10)*D2+48*D3+82*D4+(-13)*D5+2*D6+(-10)*E3+(-16)*E4+2*F3+3*F4)/256。
f4＝(3*A3+2*A4+(-16)*B3+(-10)*B4+2*C1+(-13)*C2+82*C3+48*C4+(-10)*C5+2*C6+4*D1+(-21)*D2+141*D3+82*D4+(-16)*D5+3*D6+(-21)*E3+(-13)*E4+4*F3+3*F4)/256。
f6＝(2*A3+3*A4+(-10)*B3+(-16)*B4+2*C1+(-10)*C2+48*C3+82*C4+(-13)*C5+3*C6+3*D1+(-16)*D2+82*D3+141*D4+(-21)*D5+4*D6+(-13)*E3+(-21)*E4+2*F3+4*F4)/256。
According to the interpolation method of 1/8 pixel precision of the embodiment of the invention, for all branch location of pixels interpolation, only need use whole pixel as the reference pixel, simplify interpolation process in the branch location of pixels, thereby reduced the time delay of interpolation process.Adopt high-precision interpolation filter simultaneously, in motion compensation, can make motion vector be accurate to 1/8 Pixel-level, improve precision of prediction, reduce code check, and improve the compression efficiency of video coding.
Describe embodiments of the invention below with reference to Fig. 4 and also proposed a kind of 1/8 pixel precision interpolating apparatus 100.
As shown in Figure 4,1/8 pixel precision interpolating apparatus 100 according to the embodiment of the invention comprises acquisition module 110, image element interpolation module 120 and output module 130.Wherein, acquisition module 110 and image element interpolation module 120 are connected by data/address bus, and image element interpolation module 120 and output module 130 are connected by data/address bus.
Image element interpolation module 120 links to each other with acquisition module 110, to carrying out interpolation to obtain the branch pixel from the conduct of acquisition module 110 with reference to the whole pixel of pixel.Divide pixel to comprise 3 big classes, comprise half-pix point, 1/4 pixel and 1/8 pixel.Half-pix point, 1/4 pixel and 1/8 pixel segment classification separately again, can be divided into 14 groups altogether.For obtaining branch pixel corresponding to each group, as shown in Figure 5, image element interpolation module 120 further comprises a class half-pix interpolating unit 1201, two class half-pix interpolating unit 1202, one class, 1/4 picture element interpolation unit 1203, two classes, 1/4 picture element interpolation unit 1204, three classes, 1/4 picture element interpolation unit 1205, one class, 1/8 picture element interpolation unit 1206, two classes, 1/8 picture element interpolation unit 1207, three classes, 1/8 picture element interpolation unit 1208, four classes, 1/8 picture element interpolation unit 1209, five classes, 1/8 picture element interpolation unit 1210, six classes, 1/8 picture element interpolation unit 1211, seven classes, 1/8 picture element interpolation unit 1212, eight classes, 1/8 picture element interpolation unit 1213, nine classes, 1/8 picture element interpolation unit 1214.Acquisition module 110 links to each other with each interpolating unit by data/address bus respectively with output module 130.In one embodiment of the invention, above-mentioned each interpolating unit all can be filter, and the tap coefficient sum of each filter is 256, and the tap of each a filter number average is less than 36.
Respectively each interpolating unit is described below with reference to Fig. 5.
(1) one class half-pix interpolating unit 1201 can interpolation be obtained a class half-pix point, a class half-pix point for whole pixel at half-pix point, as a5, e1 with delegation or same row.The filter of one class half-pix interpolating unit 1201 be tap coefficient be 0,0,0,0,0,0}, 1 ,-3,2,2 ,-3,1}, 5 ,-27,150,150 ,-27,5}, 1 ,-3,2,2 ,-3,1}, 0,0,0,0,0,0}, 0,0,0,0,0,0, the filter of 18 taps of 0}}.Wherein,
a5＝(1*B1+(-3)*B2+2*B3+2*B4+(-3)*B5+2*B6+5*C1+(-27)*C2+150*C3+150*C4+(-27)*C5+5*C6+1*D1+(-3)*D2+2*D3+2*D4+(-3)*D5+1*D6)/256。
e1＝(1*A2+5*A3+1*A4+(-3)*B2+(-27)*B3+(-3)*B4+2*C2+150*C3+2*C4+2*D2+150*D3+2*D4+(-3)*E2+(-27)*E3+(-2)*E4+1*F2+5*F3+1*F4)/256。
(2) two class half-pix interpolating unit 1202 can interpolation be obtained 2 class half-pix points, and 2 class half-pix points are the residue half-pix point in the half-pix point, i.e. other half-pix points except that a class half-pix point are as e5.The filter of two class half-pix interpolating unit 1202 is that tap coefficient is
0,0,3,3,0,0}, 0,0 ,-16 ,-16,0,0}, 3 ,-16,90,90 ,-16,3}, and 3 ,-16,90,90 ,-16,3}, 0,0 ,-16 ,-16,0,0}, and 0,0,3,3,0, the filter of 20 taps of 0}}.Wherein,
e5＝(3*A3+3*A4+(-16)*B3+(-16)*B4+3*C1+(-16)*C2+90*C3+90*C4+(-16)*C5+3*C6+3*D1+(-16)*D2+90*D3+90*D4+(-16)*D5+3*D6+(-16)*E3+(-16)*E4+3*F3+3*F4)/256。
(3) one classes 1/4 picture element interpolation unit 1203 can interpolation obtain a class 1/4 pixel, and a class 1/4 pixel is and puts in order pixel at 1/4 pixel with delegation or same row, as a3, a7, c1, g1.The filter of one class, 1/4 picture element interpolation unit 1203 is that tap coefficient is
0,0,0,0,0,0}, 1 ,-2,1,1 ,-2,1}, 5 ,-27,223,67 ,-14,2}, and 1 ,-2,1,1 ,-2,1}, 0,0,0,0,0,0}, and 0,0,0,0,0, the filter of 20 taps of 0}}.Wherein,
a3＝(1*B1+(-2)*B2+1*B3+1*B4+(-2)*B5+1*B6+5*C1+(-27)*C2+223*C3+67*C4+(-14)*C5+2*C6+1*D1+(-2)*D2+1*D3+1*D4+(-2)*D5+1*D6)/256。
a7＝(1*B1+(-2)*B2+1*B3+1*B4+(-2)*B5+1*B6+2*C1+(-14)*C2+67*C3+223*C4+(-27)*C5+5*C6+1*D1+(-2)*D2+1*D3+1*D4+-2*D5+1*D6)/256。
c1＝(1*A2+5*A3+1*A4+(-2)*B2+(-27)*B3+(-2)*B3+1*C2+223*C3+1*C4+1*D2+67*D3+1*D4+(-2)*E2+(-14)*E3+(-2)*E4+1*F2+2*F3+1*F4)/256。
g1＝(1*A2+2*A3+1*A4+(-2)*B2+(-14)*B3+(-2)*B4+1*C2+67*C3+1*C4+1*D2+223*D3+1*D4+(-2)*E2+(-27)*E3+(-2)*E4+1*F2+5*F3+1*F4)/256。
(4) two classes 1/4 picture element interpolation unit 1204 can interpolation obtain two classes, 1/4 pixel, two classes, 1/4 pixel be simultaneously with a class half-pix point and 2 class half-pix points with delegation or while and a class half-pix point and 2 class half-pix points 1/4 pixel at same row, as c5, e3, e7, g5.The filter of two classes, 1/4 picture element interpolation unit 1204 be tap coefficient be 0,0,3,3,0,0}, 0,0 ,-15 ,-15,0,0}, 4 ,-23,132,132 ,-23,4}, 2 ,-9,41,41 ,-9,2}{0,0 ,-9 ,-9,0,0}, 0,0,2,2,0, the filter of 20 taps of 0}}.Wherein,
c5＝(3*A3+3*A4+(-15)*B3+(-15)*B4+4*C1+(-23)*C2+132*C3+132*C4+(-23)*C5+4*C6+2*D1+(-9)*D2+41*D3+41*D4+(-9)*D5+2*D6+(-9)*E3+(-9)*E4+2*F3+2*F4)/256。
e3＝(4*A3+2*A4+(-23)*B3+(-9)*B4+3*C1+(-15)*C2+132*C3+41*C4+(-9)*C5+2*C6+3*D1+(-15)*D2+132*D3+41*D4+(-9)*D5+2*D6+(-23)*E3+(-9)*E4+4*F3+2*F4)/256。
(5) three classes 1/4 picture element interpolation unit 1205 can interpolation obtain three classes, 1/4 pixel, and three classes, 1/4 pixel is residue 1/4 pixel in 1/4 pixel, i.e. 1/4 pixel except that a class 1/4 pixel and two classes, 1/4 pixel is as c3, c7, g3, g7.The filter of three classes, 1/4 picture element interpolation unit 1205 is that tap coefficient is
0,0,4,2,0,0}, 0,0 ,-23 ,-8,0,0}, 4 ,-23,194,60 ,-12,2}, and 2 ,-8,60,20 ,-5,1}, 0,0 ,-12 ,-5,0,0}, and 0,0,2,1,0, the filter of 20 taps of 0}}.Wherein,
c3＝(4*A3+2*A4+(-23)*B3+(-8)*B4+4*C1+(-23)*C2+194*C3+60*C4+(-12)*C5+2*C6+2*D1+(-8)*D2+60*D3+20*D4+(05)*D5+1*D6+(-12)*E3+(-5)*E4+2*F3+1*F4)/256。
c7＝(2*A3+4*A4+(-8)*B3+(-23)*B4+2*C?1+(-12)*C2+60*C3+194*C4+(-23)*C5+4*C6+1*D1+(-5)*D2+20*D3+60*D4+(-8)*D5+2*D6+(-5)*E3+(-12)*E4+1*F3+2*F4)/256。
g3＝(2*A3+1*A4+(-12)*B3+(-5)*B4+2*C1+(-8)*C2+60*C3+20*C4+(-5)*C5+1*C6+4*D1+(-23)*D2+194*D3+60*D4+(-12)*D5+2*D6+(-23)*E3+(-8)*E4+4*F3+2*F4)/256。
g7＝(1*A3+2*A4+(-5)*B3+(-12)*B4+1*C1+(-5)*C2+20*C3+60*C4+(-8)*C5+2*C6+2*D1+(-12)*D2+60*D3+194*D4+(-23)*D5+4*D6+(-8)*E3+(-23)*E4+2*F3+4*F4)/256。
(6) one classes 1/8 picture element interpolation unit 1206 can interpolation obtain a class 1/8 pixel, and a class 1/8 pixel is 1/8 pixel between whole pixel and a class 1/4 pixel, as a2, a8, b1, h1.The filter of one class, 1/8 picture element interpolation unit 1206 is that tap coefficient is
0,0,0,0,0,0}, 0 ,-1,1,1 ,-1,0}, 3 ,-18,246,30 ,-6,1}, and 0 ,-1,1,1 ,-1,0}, 0,0,0,0,0,0}, and 0,0,0,0,0, the filter of 14 taps of 0}}.Wherein,
a2＝((-1)*B2+1*B3+1*B4+(-1)*B5+3*C1+(-18)*C2+246*C3+30*C4+(-6)*C5+1*C6+(-1)*D2+1*D3+1*D4+(-1)*D5)/256。
a8＝((-1)*B2+1*B3+1*B4+(-1)*B5+1*C1+(-6)*C2+30*C3+246*C4+(-18)*C5+3*C6+(-1)*D2+1*D3+1*D4+(-1)*D5)/256。
b1＝(3*A3+(-1)*B2+(-18)*B3+(-1)*B4+1*C2+246*C3+1*C4+1*D2+30*D3+1*D4+(-1)*E2+(-6)*E3+(-1)*E4+1*F3)/256。
h1＝(1*A3+(-1)*B2+(-6)*B3+(-1)*B4+1*C2+30*C3+1*C4+1*D2+246*D3+1*D4+(-1)*E2+(-18)*E3+(-1)*E4+3*F3)/256。
(7) two classes 1/8 picture element interpolation unit 1207 can interpolation obtain two classes, 1/8 pixel, and two classes, 1/8 pixel is 1/8 pixel between a class half-pix point and a class 1/4 pixel, as a4, a6, d1, f1.The filter of two classes, 1/8 picture element interpolation unit 1207 is that tap coefficient is
0,0,0,0,0,0}, 1 ,-3,2,1 ,-2,1}, 5 ,-29,189,108 ,-21,4}, and 1 ,-3,2,1 ,-2,1}, 0,0,0,0,0,0}, and 0,0,0,0,0, the filter of 18 taps of 0}}.Wherein,
a4＝(1*B1+(-3)*B2+2*B3+1*B4+(-2)*B5+1*B6+5*C1+(-29)*C2+189*C3+108*C4+(-21)*C5+4*C6+1*D1+(-3)*D2+2*D3+1*D4+(-2)*D5+1*D6)/256。
a6＝(1*B1+(-2)*B2+1*B3+2*B4+(-3)*B5+1*B6+4*C1+(-21)*C2+108*C3+189*C4+(-29)*C5+5*C6+1*D1+(-2)*D2+1*D3+2*D4+(-3)*D5+1*D6)/256。
d1＝(1*A2+5*A3+1*A4+(-3)*B2+(-29)*B3+(-3)*B4+2*C2+189*C3+2*C4+1*D2+108*D3+1*D4+(-2)*E2+(-21)*E3+(-2)*E4+1*F2+4*F3+1*F4)/256。
f1＝(1*A2+4*A3+1*A4+(-2)*B2+(-21)*B3+(-2)*B4+1*C2+108*C3+1*C4+2*D2+189*D3+2*D4+(-3)*E2+(-29)*E3+(-3)*E4+1*F2+5*F3+1*F4)/256。
(8) three classes 1/8 picture element interpolation unit 1208 can interpolation obtain three classes, 1/8 pixel, and three classes, 1/8 pixel is 1/8 pixel between a class 1/4 pixel and three classes, 1/4 pixel, as b3, b7, c2, c8, g2, g8, h2, h8.The filter of three classes, 1/8 picture element interpolation unit 1208 is that tap coefficient is
0,0,3,1,0,0}, 1 ,-1 ,-14 ,-4 ,-1,0}, 4 ,-25,214,65 ,-13,2}, and 1 ,-5,27,9 ,-3,1}, 0,0 ,-6 ,-2,0,0}{0,0,1,1,0, the filter of 22 taps of 0}}.Wherein,
b3＝(3*A3+1*A4+1*B1+(-1)*B2+(-14)*B3+(-4)*B4+(-1)*B5+4*C1+(-25)*C2+214*C3+65*C4+(-13)*C5+2*C6+1*D1+(-5)*D2+27*D3+9*D4+(-3)*D5+1*D6+(-6)*E3+(-2)*E4+1*F3+1*F4)/256。
b7＝(1*A3+3*A4+(-1)*B2+(-4)*B3+(-14)*B4+(-1)*B5+1*B6+2*C1+(-13)*C2+65*C3+214*C4+(-25)*C5+4*C6+1*D1+(-3)*D2+9*D3+27*D4+(-5)*D5+1*D6+(-2)*E3+(-6)*E4+1*F3+1*F4)/256。
c2＝(1*A2+4*A3+1*A4+(-1)*B2+(-25)*B3+(-5)*B4+3*C1+(-14)*C2+214*C3+27*C4+(-6)*C5+1*C6+1*D1+(-4)*D2+65*D3+9*D4+(-2)*D5+1*D6+(-1)*E2+(-13)*E3+(-3)*E4+2*F3+1*F4)/256。
c8＝(1*A3+4*A4+1*A5+(-5)*B3+(-25)*B4+(-1)*B5+1*C1+(-6)*C2+27*C3+214*C4+(-14)*C5+3*C6+1*D1+(-2)*D2+9*D3+65*D4+(-4)*D5+1*D6+(-3)*E3+(-13)*E4+(-1)*E5+1*F3+2*F4)/256。
g2＝(2*A3+1*A4+(-1)*B2+(-13)*B3+(-3)*B4+1*C1+(-4)*C2+65*C3+9*C4+(-2)*C5+1*C6+3*D1+(-14)*D2+214*D3+27*D4+(-6)*D5+1*D6+(-1)*E2+(-25)*E3+(-5)*E4+1*F2+4*F3+1*F4)/256。
g8＝(1*A3+2*A4+(-3)*B3+(-13)*B4+(-1)*B5+1*C1+(-2)*C2+9*C3+65*C4+(-4)*C5+1*C6+1*D1+(-6)*D2+27*D3+214*D4+(-14)*D5+3*D6+(-5)*E3+(-25)*E4+(-1)*E5+1*F3+4*F4+1*F5)/256。
h3＝(1*A3+1*A4+(-6)*B3+(-2)*B4+1*C1+(-5)*C2+27*C3+9*C4+(-3)*C5+1*C6+4*D1+(-25)*D2+214*D3+65*D4+(-13)*D5+2*D6+1*E1+(-1)*E2+(-14)*E3+(-4)*E4+(-1)*E5+3*F3+1*F4)/256。
h7＝(1*A3+1*A4+(-2)*B3+(-6)*B4+1*C1+(-3)*C2+9*C3+27*C4+(-5)*C5+1*C6+2*D1+(-13)*D2+65*D3+214*D4+(-25)*D5+4*D6+(-1)*E2+(-4)*E3+(-14)*E4+(-1)*E5+1*E6+1*F3+3*F4)/256。
(9) four classes 1/8 picture element interpolation unit 1209 can interpolation obtain four classes, 1/8 pixel, and four classes, 1/8 pixel is 1/8 pixel between a class half-pix point and two classes, 1/4 pixel, as b5, e2, e8, h5.The filter of four classes, 1/8 picture element interpolation unit 1209 is that tap coefficient is
0,0,2,2,0,0}, 1 ,-1 ,-9 ,-9 ,-1,1}, 4 ,-26,145,145 ,-26,4}, and 1 ,-5,19,19 ,-5,1}, 0,0 ,-4 ,-4,0,0}, and 0,0,1,1,0, the filter of 24 taps of 0}}.Wherein,
b5＝(2*A3+2*A4+1*B1+(-1)*B2+(-9)*B3+(-9)*B4+(-1)*B5+1*B6+4*C1+(-26)*C2+145*C3+145*C4+(-26)*C5+4*C6+1*D1+(-5)*D2+19*D3+19*D4+(-5)*D5+1*D6+(-4)*E3+(-4)*E4+1*F3+1*F4)/256。
e2＝(1*A2+4*A3+1*A4+(-1)*B2+(-26)*B3+(-5)*B4+2*C1+(-9)*C2+145*C3+19*C4+(-4)*C5+1*C6+2*D1+(-9)*D2+145*D3+19*D4+(-4)*D5+1*D6+(-1)*E2+(-26)*E3+(-5)*E4+1*F2+4*F3+1*F4)/256。
e8＝(1*A3+4*A4+1*A5+(-5)*B3+(-26)*B4+(-1)*B5+1*C1+(-4)*C2+19*C3+145*C4+(-9)*C5+2*C6+1*D1+(-4)*D2+19*D3+145*D4+(-9)*D5+2*D6+(-5)*E3+(-26)*E4+(-1)*E5+1*F3+4*F4+1*F5)/256。
h5＝(1*A3+1*A4+(-4)*B3+(-4)*B4+1*C1+(-5)*C2+19*C3+19*C4+(-5)*C5+1*C6+4*D1+(-26)*D2+145*D3+145*D4+(-26)*D5+4*D6+1*E1+(-1)*E2+(-9)*E3+(-9)*E4+(-1)*E5+1*E6+2*F3+2*F4)/256。
(10) five classes 1/8 picture element interpolation unit 1210 can interpolation obtain five classes, 1/8 pixel, and five classes, 1/8 pixel is 1/8 pixel between three classes, 1/4 pixel and two classes, 1/4 pixel, as c4, c6, d3, d7, f3, f7, g4, g6.The filter of five classes, 1/8 picture element interpolation unit 1210 is that tap coefficient is
0,0,4,2,0,0}, 0,0 ,-19 ,-11,0,0}, 4 ,-25,166,95 ,-18,3}, and 2 ,-9,51,31 ,-7,2}, 0,0 ,-11 ,-7,0,0}, and 0,0,2,1,0, the filter of 20 taps of 0}}.Wherein,
c4＝(4*A3+2*A4+(-19)*B3+(-11)*B4+4*C1+(-25)*C2+166*C3+95*C4+(-18)*C5+3*C6+2*D1+(-9)*D2+51*D3+31*D4+(-7)*D5+2*D6+(-11)*E3+(-7)*E4+2*F3+1*F4)/256。
c6＝(2*A3+4*A4+(-11)*B3+(-19)*B4+3*C1+(-18)*C2+95*C3+166*C4+(-25)*C5+4*C6+2*D1+(-7)*D2+31*D3+51*D4+(-9)*D5+2*D6+(-7)*E3+(-11)*E4+1*F3+2*F4)/256。
d3＝(4*A3+2*A4+(-25)*B3+(-9)*B4+4*C1+(-19)*C2+166*C3+51*C4+(-11)*C5+2*C6+2*D1+(-11)*D2+95*D3+31*D4+(-7)*D5+1*D6+(-18)*E3+(-7)*E4+3*F3+2*F4)/256。
d7＝(2*A3+4*A4+(-9)*B3+(-25)*B4+2*C1+(-11)*C2+51*C3+166*C4+(-19)*C5+4*C6+1*D1+(-7)*D2+31*D3+95*D4+(-11)*D5+2*D6+(-7)*E3+(-18)*E4+2*F3+3*F4)/256。
f3＝(3*A3+2*A4+(-18)*B3+(-7)*B4+2*C1+(-11)*C2+95*C3+31*C4+(-7)*C5+1*C6+4*D1+(-19)*D2+166*D3+51*D4+(-11)*D5+2*D6+(-25)*E3+(-9)*E4+4*F3+2*F4)/256。
f7＝(2*A3+3*A4+(-7)*B3+(-18)*B4+1*C1+(-7)*C2+31*C3+95*C4+(-11)*C5+2*C6+2*D1+(-11)*D2+51*D3+166*D4+(-19)*D5+4*D6+(-9)*E3+(-25)*E4+2*F3+4*F4)/256。
g4＝(2*A3+1*A4+(-11)*B3+(-7)*B4+2*C1+(-9)*C2+51*C3+31*C4+(-7)*C5+2*C6+4*D1+(-25)*D2+166*D3+95*D4+(-18)*D5+3*D6+(-19)*E3+(-11)*E4+4*F3+2*F4)/256。
g6＝(1*A3+2*A4+(-7)*B3+(-11)*B4+2*C1+(-7)*C2+31*C3+51*C4+(-9)*C5+2*C6+3*D1+(-18)*D2+95*D3+166*D4+(-25)*D5+4*D6+(-11)*E3+(-19)*E4+2*F3+4*F4)/256。
(11) six classes 1/8 picture element interpolation unit 1211 can interpolation obtain six classes, 1/8 pixel, and six classes, 1/8 pixel is 1/8 pixel between two classes, 1/4 pixel and 2 class half-pix points, as d5, e4, e6, f5.The filter of six classes, 1/8 picture element interpolation unit 1211 is that tap coefficient is
0,0,3,3,0,0}, 0,0 ,-17 ,-17,0,0}, 4 ,-20,113,113 ,-20,4}, and 2 ,-12,66,66 ,-12,2}, 0,0 ,-13 ,-13,0,0}, and 0,0,2,2,0, the filter of 20 taps of 0}}.Wherein,
d5＝(3*A3+3*A4+(-17)*B3+(-17)*B4+4*C1+(-20)*C2+113*C3+113*C4+(-20)*C5+4*C6+2*D1+(-12)*D2+66*D3+66*D4+(-12)*D5+2*D6+(-13)*E3+(-13)*E4+2*F3+2*F4)/256。
e4＝(4*A3+2*A4+(-20)*B3+(-12)*B4+3*C1+(-17)*C2+113*C3+66*C4+(-13)*C5+2*C6+3*D1+(-17)*D2+113*D3+66*D4+(-13)*D5+2*D6+(-20)*E3+(-12)*E4+4*F3+2*F4)/256。
e6＝(2*A3+4*A4+(-12)*B3+(-20)*B4+2*C1+(-13)*C2+66*C3+113*C4+(-17)*C5+3*C6+2*D1+(-13)*D2+66*D3+113*D4+(-17)*D5+3*D6+(-12)*E3+(-20)*E4+2*F3+4*F4)/256。
f5＝(2*A3+2*A4+(-13)*B3+(-13)*B4+2*C1+(-12)*C2+66*C3+66*C4+(-12)*C5+2*C6+4*D1+(-20)*D2+113*D3+113*D4+(-20)*D5+4*D6+(-17)*E3+(-17)*E4+3*F3+3*F4)/256。
(12) seven classes 1/8 picture element interpolation unit 1212 can interpolation obtain seven classes, 1/8 pixel, and seven classes, 1/8 pixel is 1/8 pixel between a class 1/8 pixel and three classes, 1/8 pixel, as b2, b8, g2, g8.The filter of seven classes, 1/8 picture element interpolation unit 1212 is that tap coefficient is
0,0,3,1,0,0}, 0 ,-1 ,-17 ,-2,0,0}, 3 ,-17,237,29 ,-6,1}, and 1 ,-2,29,5 ,-2,0}, 0,0 ,-6 ,-1,0,0}, and 0,0,1,0,0, the filter of 19 taps of 0}}.Wherein,
b2＝(3*A3+1*A4+(-1)*B2+(-17)*B3+(-2)*B4+3*C1+(-17)*C2+237*C3+29*C4+(-6)*C5+1*C6+1*D1+(-2)*D2+29*D3+5*D4+(-2)*D5+(-6)*E3+(-1)*E4+1*F3)/256。
b8＝(1*A3+3*A4+(-2)*B3+(-17)*B4+(-1)*B5+1*C1+(-6)*C2+29*C3+237*C4+(-17)*C5+3*C6+(-1)*D2+5*D3+29*D4+(-2)*D5+1*D6+(-2)*E3+(-6)*E4+1*F4)/256。
h2＝(1*A3+(-6)*B3+(-1)*B4+1*C1+(-2)*C2+29*C3+5*C4+(-2)*C5+3*D1+(-17)*D2+237*D3+29*D4+(-6)*D5+1*D6+(-1)*E2+(-17)*E3+(-2)*E4+3*F3+1*F4)/256。
h8＝(1*A4+(-2)*B3+(-6)*B4+(-1)*C2+5*C3+29*C4+(-2)*C5+1*C6+1*D1+(-6)*D2+29*D3+237*D4+(-17)*D5+3*D6+(-2)*E3+(-17)*E4+(-1)*E5+1*F3+3*F4)/256。
(13) eight classes 1/8 picture element interpolation unit 1213 can interpolation obtain eight classes, 1/8 pixel, eight classes, 1/8 pixel is 1/8 pixel between two classes, 1/8 pixel, three classes, 1/8 pixel, four classes, 1/8 pixel, five classes, 1/8 pixel, as b4, b6, d2, d8, f2, f8, h4, h6.The filter of eight classes, 1/8 picture element interpolation unit 1213 is that tap coefficient is
0,0,2,1,0,0}, 1 ,-1 ,-12 ,-7 ,-1,0}, 5 ,-28,182,105 ,-20,4}, and 1 ,-5,24,15 ,-5,1}, 0,0 ,-5 ,-3,0,0}, and 0,0,1,1,0, the filter of 23 taps of 0}}.Wherein,
b4＝(2*A3+1*A4+1*B1+(-1)*B2+(-12)*B3+(-7)*B4+(-1)*B5+5*C1+(-28)*C2+182*C3+105*C4+(-20)*C5+4*C6+1*D1+(-5)*D2+24*D3+15*D4+(-5)*D5+1*D6+(-5)*E3+(-3)*E4+1*F3+1*F4)/256。
b6＝(1*A3+2*A4+(-1)*B2+(-7)*B3+(-12)*B4+(-1)*B5+1*B6+4*C1+(-20)*C2+105*C3+182*C4+(-28)*C5+5*C6+1*D1+(-5)*D2+15*D3+24*D4+(-5)*D5+1*D6+(-3)*E3+(-5)*E4+1*F3+1*F4)/256。
d2＝(1*A2+5*A3+1*A4+(-1)*B2+(-28)*B3+(-5)*B4+2*C1+(-12)*C2+182*C3+24*C4+(-5)*C5+1*C6+1*D1+(-7)*D2+105*D3+15*D4+(-3)*D5+1*D6+(-1)*E2+(-20)*E3+(-5)*E4+4*F3+1*F4)/256。
d8＝(1*A3+5*A4+1*A5+(-5)*B3+(-28)*B4+(-1)*B5+1*C1+(-5)*C2+24*C3+182*C4+(-12)*C5+2*C6+1*D1+(-3)*D2+15*D3+105*D4+(-7)*D5+1*D6+(-5)*E3+(-20)*E4+(-1)*E5+1*F3+4*F4)/256。
f2＝(4*A3+1*A4+(-1)*B2+(-20)*B3+(-5)*B4+1*C1+(-7)*C2+105*C3+15*C4+(-3)*C5+1*C6+2*D1+(-12)*D2+182*D3+24*D4+(-5)*D5+1*D6+(-1)*E2+(-28)*E3+(-5)*E4+1*F2+5*F3+1*F4)/256。
f8＝(1*A3+4*A4+(-5)*B3+(-20)*B4+(-1)*B5+1*C1+(-3)*C2+15*C3+105*C4+(-7)*C5+1*C6+1*D1+(-5)*D2+24*D3+182*D4+(-12)*D5+2*D6+(-5)*E3+(-28)*E4+(-1)*E5+1*F3+5*F4+1*F5)/256。
h4＝(1*A3+1*A4+(-5)*B3+(-3)*B4+1*C1+(-5)*C2+24*C3+15*C4+(-5)*C5+1*C6+5*D1+(-28)*D2+182*D3+105*D4+(-20)*D5+4*D6+1*E1+(-1)*E2+(-12)*E3+(-7)*E4+(-1)*E5+2*F3+1*F4)/256。
h6＝(1*A3+1*A4+(-3)*B3+(-5)*B4+1*C1+(-5)*C2+15*C3+24*C4+(-5)*C5+1*C6+4*D1+(-20)*D2+105*D3+182*D4+(-28)*D5+5*D6+(-1)*E2+(-7)*E3+(-12)*E4+(-1)*E5+1*E6+1*F3+2*F4)/256。
(14) nine classes 1/8 picture element interpolation unit 1214 can interpolation obtain nine classes, 1/8 pixel, and nine classes, 1/8 pixel is 1/8 pixel between five classes, 1/8 pixel and six classes, 1/8 pixel, as d4, d6, f4, f6.The filter of nine classes, 1/8 picture element interpolation unit 1214 is that tap coefficient is
0,0,4,3,0,0}, 0,0 ,-21 ,-13,0,0}, 4 ,-21,141,82 ,-16,3}, and 2 ,-13,82,48 ,-10,2}, 0,0 ,-16 ,-10,0,0}, and 0,0,3,2,0, the filter of 20 taps of 0}}.Wherein,
d4＝(4*A3+3*A4+(-21)*B3+(-13)*B4+4*C1+(-21)*C2+141*C3+82*C4+(-16)*C5+3*C6+2*D1+(-13)*D2+82*D3+48*D4+(-10)*D5+2*D6+(-16)*E3+(-10)*E4+3*F3+2*F4)/256。
d6＝(3*A3+4*A4+(-13)*B3+(-21)*B4+3*C1+(-16)*C2+82*C3+141*C4+(-21)*C5+4*C6+2*D1+(-10)*D2+48*D3+82*D4+(-13)*D5+2*D6+(-10)*E3+(-16)*E4+2*F3+3*F4)/256。
f4＝(3*A3+2*A4+(-16)*B3+(-10)*B4+2*C1+(-13)*C2+82*C3+48*C4+(-10)*C5+2*C6+4*D1+(-21)*D2+141*D3+82*D4+(-16)*D5+3*D6+(-21)*E3+(-13)*E4+4*F3+3*F4)/256。
f6＝(2*A3+3*A4+(-10)*B3+(-16)*B4+2*C1+(-10)*C2+48*C3+82*C4+(-13)*C5+3*C6+3*D1+(-16)*D2+82*D3+141*D4+(-21)*D5+4*D6+(-13)*E3+(-21)*E4+2*F3+4*F4)/256。
According to the interpolating apparatus of 1/8 pixel precision of the embodiment of the invention, for all branch location of pixels interpolation, only need use whole pixel as the reference pixel, simplify interpolation process in the branch location of pixels, thereby reduced the time delay of interpolation process.The interpolating apparatus of the embodiment of the invention adopts high-precision interpolation filter simultaneously, can make motion vector be accurate to 1/8 Pixel-level in motion compensation, improves precision of prediction, reduces code check, and improves the compression efficiency of video coding.
In the description of this specification, concrete feature, structure, material or characteristics that the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means in conjunction with this embodiment or example description are contained at least one embodiment of the present invention or the example.In this manual, the schematic statement to above-mentioned term not necessarily refers to identical embodiment or example.And concrete feature, structure, material or the characteristics of description can be with the suitable manner combination in any one or more embodiment or example.
Although illustrated and described embodiments of the invention, for the ordinary skill in the art, be appreciated that without departing from the principles and spirit of the present invention and can carry out multiple variation, modification, replacement and modification that scope of the present invention is by claims and be equal to and limit to these embodiment.
Claims (11)
1. a pixel precision interpolation method is characterized in that, comprises the steps:
The position of branch pixel classification and described minute pixel is set, and pixel comprised in described minute: half-pix point, 1/4 pixel and 1/8 pixel,
Wherein, described half-pix point comprises a class half-pix point and 2 class half-pix points, a described class half-pix point for described whole pixel at half-pix point with delegation or same row, described 2 class half-pix points are the interior residue half-pix point of described half-pix point;
Described 1/4 pixel comprises a class 1/4 pixel, two classes, 1/4 pixel and three classes, 1/4 pixel, a described class 1/4 pixel be with described whole pixel in 1/4 pixel with delegation or same row, described two classes, 1/4 pixel be simultaneously with a described class half-pix point and 2 class half-pix points with delegation or while and a described class half-pix point and 2 class half-pix points 1/4 pixel at same row, described three classes, 1/4 pixel is interior residue 1/4 pixel of described 1/4 pixel;
Described 1/8 pixel comprises a class 1/8 pixel, two classes, 1/8 pixel, three classes, 1/8 pixel, four classes, 1/8 pixel, five classes, 1/8 pixel, six classes, 1/8 pixel, seven classes, 1/8 pixel, eight classes, 1/8 pixel and nine classes, 1/8 pixel, and a described class 1/8 pixel is 1/8 pixel between described whole pixel and a class 1/4 pixel; Described two classes, 1/8 pixel is 1/8 pixel between a described class half-pix point and a class 1/4 pixel, described three classes, 1/8 pixel is 1/8 pixel between a described class 1/4 pixel and three classes, 1/4 pixel, described four classes, 1/8 pixel is 1/8 pixel between a described class half-pix point and two classes, 1/4 pixel, described five classes, 1/8 pixel is 1/8 pixel between three classes, 1/4 pixel and two classes, 1/4 pixel, described six classes, 1/8 pixel is 1/8 pixel between described two classes, 1/4 pixel and 2 class half-pix points, described seven classes, 1/8 pixel is 1/8 pixel between a described class 1/8 pixel and three classes, 1/8 pixel, described eight classes, 1/8 pixel is for being positioned at described two classes, 1/8 pixel, three classes, 1/8 pixel, four classes, 1/8 pixel, 1/8 pixel between five classes, 1/8 pixel, described nine classes, 1/8 pixel are 1/8 pixel between five classes, 1/8 pixel and six classes, 1/8 pixel; And
From the original reference frame, choose whole pixel in nearest (M+5) * (N+5) the whole block of pixels of the branch block of pixels that constitutes with described minute pixel as the reference pixel, carry out interpolation according to the position of all kinds of minutes pixels that have been provided with and obtain described minute pixel, wherein, M is the number that every row divides pixel in the described minute block of pixels obtaining of interpolation, and N is the number that every row divide pixel in the described minute pixel obtaining of interpolation.
2. interpolation method as claimed in claim 1 is characterized in that, utilizes interpolation filter to obtain all kinds of minutes pixels according to the position of all kinds of minutes pixels that have been provided with, and wherein to divide the tap coefficient sum of the interpolation filter of pixel correspondence be 256 to each class.
3. interpolation method as claimed in claim 1 is characterized in that, every number of going the branch pixel is 1 in the described minute block of pixels, and it is 1 that every row divide the number of pixel.
4. interpolation method as claimed in claim 3 is characterized in that, the tap number of described interpolation filter is less than 36.
5. interpolation method as claimed in claim 4 is characterized in that, a described class half-pix point is { { 0,0,0,0,0 by tap coefficient, 0}, and 1 ,-3,2,2 ,-3,1}, 5 ,-27,150,150 ,-27,5}, { 1,-3,2,2 ,-3,1}, { 0,0,0,0,0,0}, { 0,0,0,0,0,0, the filter interpolation of 18 taps of 0}} is obtained;
Described 2 class half-pix points by tap coefficient are
0,0,3,3,0,0}, 0,0 ,-16 ,-16,0,0}, 3 ,-16,90,90 ,-16,3}, and 3 ,-16,90,90 ,-16,3}, 0,0 ,-16 ,-16,0, and 0}, { 0,0,3,3,0, the filter interpolation of 20 taps of 0}} is obtained;
A described class 1/4 pixel by tap coefficient is
0,0,0,0,0,0}, 1 ,-2,1,1 ,-2,1}, 5 ,-27,223,67 ,-14,2}, and 1 ,-2,1,1 ,-2,1}, 0,0,0,0,0, and 0}, { 0,0,0,0,0, the filter interpolation of 18 taps of 0}} is obtained;
Described two classes, 1/4 pixel by tap coefficient be 0,0,3,3,0,0}, 0,0 ,-15 ,-15,0,0}, 4 ,-23,132,132 ,-23,4}, 2 ,-9,41,41 ,-9,2}{0,0 ,-9 ,-9,0,0}, { 0,0,2,2,0, the filter interpolation of 20 taps of 0}} is obtained;
Described three classes, 1/4 pixel by tap coefficient is
0,0,4,2,0,0}, 0,0 ,-23 ,-8,0,0}, 4 ,-23,194,60 ,-12,2}, and 2 ,-8,60,20 ,-5,1}, 0,0 ,-12 ,-5,0, and 0}, { 0,0,2,1,0, the filter interpolation of 20 taps of 0}} is obtained;
A described class 1/8 pixel by tap coefficient is
0,0,0,0,0,0}, 0 ,-1,1,1 ,-1,0}, 3 ,-18,246,30 ,-6,1}, and 0 ,-1,1,1 ,-1,0}, 0,0,0,0,0, and 0}, { 0,0,0,0,0, the filter interpolation of 14 taps of 0}} is obtained;
Described two classes, 1/8 pixel by tap coefficient is
0,0,0,0,0,0}, 1 ,-3,2,1 ,-2,1}, 5 ,-29,189,108 ,-21,4}, and 1 ,-3,2,1 ,-2,1}, 0,0,0,0,0, and 0}, { 0,0,0,0,0, the filter interpolation of 18 taps of 0}} is obtained;
Described three classes, 1/8 pixel by tap coefficient is
0,0,3,1,0,0}, 1 ,-1 ,-14 ,-4 ,-1,0}, 4 ,-25,214,65 ,-13,2}, and 1 ,-5,27,9 ,-3,1}, 0,0 ,-6 ,-2,0, and 0}{0,0,1,1,0, the filter interpolation of 22 taps of 0}} is obtained;
Described four classes, 1/8 pixel by tap coefficient is
0,0,2,2,0,0}, 1 ,-1 ,-9 ,-9 ,-1,1}, 4 ,-26,145,145 ,-26,4}, and 1 ,-5,19,19 ,-5,1}, 0,0 ,-4 ,-4,0, and 0}, { 0,0,1,1,0, the filter interpolation of 24 taps of 0}} is obtained;
Described five classes, 1/8 pixel by tap coefficient is
0,0,4,2,0,0}, 0,0 ,-19 ,-11,0,0}, 4 ,-25,166,95 ,-18,3}, and 2 ,-9,51,31 ,-7,2}, 0,0 ,-11 ,-7,0, and 0}, { 0,0,2,1,0, the filter interpolation of 20 taps of 0}} is obtained;
Described six classes, 1/8 pixel by tap coefficient is
0,0,3,3,0,0}, 0,0 ,-17 ,-17,0,0}, 4 ,-20,113,113 ,-20,4}, and 2 ,-12,66,66 ,-12,2}, 0,0 ,-13 ,-13,0, and 0}, { 0,0,2,2,0, the filter interpolation of 20 taps of 0}} is obtained;
Described seven classes, 1/8 pixel by tap coefficient is
0,0,3,1,0,0}, 0 ,-1 ,-17 ,-2,0,0}, 3 ,-17,237,29 ,-6,1}, and 1 ,-2,29,5 ,-2,0}, 0,0 ,-6 ,-1,0, and 0}, { 0,0,1,0,0, the filter interpolation of 19 taps of 0}} is obtained;
Described eight classes, 1/8 pixel by tap coefficient is
0,0,2,1,0,0}, 1 ,-1 ,-12 ,-7 ,-1,0}, 5 ,-28,182,105 ,-20,4}, and 1 ,-5,24,15 ,-5,1}, 0,0 ,-5 ,-3,0, and 0}, { 0,0,1,1,0, the filter interpolation of 23 taps of 0}} is obtained;
Described nine classes, 1/8 pixel by tap coefficient is
0,0,4,3,0,0}, 0,0 ,-21 ,-13,0,0}, 4 ,-21,141,82 ,-16,3}, and 2 ,-13,82,48 ,-10,2}, 0,0 ,-16 ,-10,0, and 0}, { 0,0,3,2,0, the filter interpolation of 20 taps of 0}} is obtained.
6. a pixel precision interpolating apparatus is characterized in that, comprising:
Acquisition module is used for obtaining as the whole pixel with reference to pixel from the original reference frame;
The image element interpolation module, described image element interpolation module is connected with described acquisition module, be used to receive from the whole pixel of described acquisition module and to described whole pixel and carry out interpolation to obtain the branch pixel, pixel comprised in described minute: half-pix point, 1/4 pixel and 1/8 pixel, and the pixel interpolating module comprised in described minute:
One class half-pix interpolating unit is used for interpolation and obtains a class half-pix point, a described class half-pix point for described whole pixel at half-pix point with delegation or same row;
Two class half-pix interpolating unit are used for interpolation and obtain 2 class half-pix points, and described 2 class half-pix points are the residue half-pix point in the described half-pix point;
One class, 1/4 picture element interpolation unit is used for interpolation and obtains a class 1/4 pixel, a described class 1/4 pixel be with described whole pixel in 1/4 pixel with delegation or same row;
Two classes, 1/4 picture element interpolation unit, be used for interpolation and obtain two classes, 1/4 pixel, described two classes, 1/4 pixel be simultaneously with a described class half-pix point and 2 class half-pix points with delegation or while and a described class half-pix point and 2 class half-pix points 1/4 pixel at same row;
Three classes, 1/4 picture element interpolation unit is used for interpolation and obtains three classes, 1/4 pixel, and described three classes, 1/4 pixel is residue 1/4 pixel in described 1/4 pixel;
One class, 1/8 picture element interpolation unit is used for interpolation and obtains a class 1/8 pixel, and a described class 1/8 pixel is 1/8 pixel between described whole pixel and a class 1/4 pixel;
Two classes, 1/8 picture element interpolation unit is used for interpolation and obtains two classes, 1/8 pixel, and described two classes, 1/8 pixel is 1/8 pixel between a described class half-pix point and a class 1/4 pixel;
Three classes, 1/8 picture element interpolation unit is used for interpolation and obtains three classes, 1/8 pixel, and described three classes, 1/8 pixel is 1/8 pixel between a described class 1/4 pixel and three classes, 1/4 pixel;
Four classes, 1/8 picture element interpolation unit is used for interpolation and obtains four classes, 1/8 pixel, and described four classes, 1/8 pixel is 1/8 pixel between a described class half-pix point and two classes, 1/4 pixel;
Five classes, 1/8 picture element interpolation unit is used for interpolation and obtains five classes, 1/8 pixel, and described five classes, 1/8 pixel is 1/8 pixel between three classes, 1/4 pixel and two classes, 1/4 pixel;
Six classes, 1/8 picture element interpolation unit is used for interpolation and obtains six classes, 1/8 pixel, and described six classes, 1/8 pixel is 1/8 pixel between described two classes, 1/4 pixel and 2 class half-pix points;
Seven classes, 1/8 picture element interpolation unit is used for interpolation and obtains seven classes, 1/8 pixel, and described seven classes, 1/8 pixel is 1/8 pixel between a described class 1/8 pixel and three classes, 1/8 pixel;
Eight classes, 1/8 picture element interpolation unit is used for interpolation and obtains eight classes, 1/8 pixel, and described eight classes, 1/8 pixel is 1/8 pixel between described two classes, 1/8 pixel, three classes, 1/8 pixel, four classes, 1/8 pixel, five classes, 1/8 pixel;
Nine classes, 1/8 picture element interpolation unit is used for interpolation and obtains nine classes, 1/8 pixel, and described nine classes, 1/8 pixel is 1/8 pixel between five classes, 1/8 pixel and six classes, 1/8 pixel; And
Output module, described output module links to each other with described image element interpolation module, is used to export the branch pixel value of the branch pixel that interpolation obtains.
7. interpolating apparatus as claimed in claim 6, it is characterized in that, whole pixel in nearest (M+5) * (N+5) the whole block of pixels of the branch block of pixels that described whole pixel as the reference pixel constitutes for the branch pixel that obtains with interpolation, wherein, M is the number that every row divides pixel in the described minute block of pixels obtaining of interpolation, and N is the number that every row divide pixel in the described minute pixel obtaining of interpolation.
8. interpolating apparatus as claimed in claim 7 is characterized in that, every number of going the branch pixel is 1 in the described minute block of pixels, and it is 1 that every row divide the number of pixel.
9. interpolating apparatus as claimed in claim 8, it is characterized in that a described class half-pix interpolating unit, two class half-pix interpolating unit, a class 1/4 picture element interpolation unit, two classes, 1/4 picture element interpolation unit, three classes, 1/4 picture element interpolation unit, a class 1/8 picture element interpolation unit, two classes, 1/8 picture element interpolation unit, three classes, 1/8 picture element interpolation unit, four classes, 1/8 picture element interpolation unit, five classes, 1/8 picture element interpolation unit, six classes, 1/8 picture element interpolation unit, seven classes, 1/8 picture element interpolation unit, eight classes, 1/8 picture element interpolation unit and nine classes, 1/8 picture element interpolation unit are filter.
10. interpolating apparatus as claimed in claim 9, it is characterized in that, a described class half-pix interpolating unit, two class half-pix interpolating unit, one class, 1/4 picture element interpolation unit, two classes, 1/4 picture element interpolation unit, three classes, 1/4 picture element interpolation unit, one class, 1/8 picture element interpolation unit, two classes, 1/8 picture element interpolation unit, three classes, 1/8 picture element interpolation unit, four classes, 1/8 picture element interpolation unit, five classes, 1/8 picture element interpolation unit, six classes, 1/8 picture element interpolation unit, seven classes, 1/8 picture element interpolation unit, the tap coefficient sum of the filter of eight classes, 1/8 picture element interpolation unit and nine classes, 1/8 picture element interpolation unit is 256, and the tap of each a filter number average is less than 36.
11. interpolating apparatus as claimed in claim 10 is characterized in that, the filter of a described class half-pix interpolating unit is that tap coefficient is { { 0,0,0,0,0,0}, and 1 ,-3,2,2 ,-3,1}, 5 ,-27,150,150 ,-27,5}, { 1,-3,2,2 ,-3,1}, { 0,0,0,0,0,0}, { 0,0,0,0,0,0, the filter of 18 taps of 0}};
The filter of described two class half-pix interpolating unit is that tap coefficient is
0,0,3,3,0,0}, 0,0 ,-16 ,-16,0,0}, 3 ,-16,90,90 ,-16,3}, and 3 ,-16,90,90 ,-16,3}, 0,0 ,-16 ,-16,0,0}, and 0,0,3,3,0, the filter of 20 taps of 0}};
The filter of described two class half-pix interpolating unit is that tap coefficient is
0,0,3,3,0,0}, 0,0 ,-16 ,-16,0,0}, 3 ,-16,90,90 ,-16,3}, and 3 ,-16,90,90 ,-16,3}, 0,0 ,-16 ,-16,0,0}, and 0,0,3,3,0, the filter of 20 taps of 0}}
The filter of described two classes 1/4 picture element interpolation unit be tap coefficient be 0,0,3,3,0,0}, 0,0 ,-15 ,-15,0,0}, 4 ,-23,132,132 ,-23,4}, 2 ,-9,41,41 ,-9,2}{0,0 ,-9 ,-9,0,0}, 0,0,2,2,0, the filter of 20 taps of 0}};
The filter of described three classes 1/4 picture element interpolation unit is that tap coefficient is
0,0,4,2,0,0}, 0,0 ,-23 ,-8,0,0}, 4 ,-23,194,60 ,-12,2}, and 2 ,-8,60,20 ,-5,1}, 0,0 ,-12 ,-5,0,0}, and 0,0,2,1,0, the filter of 20 taps of 0}};
The filter of a described class 1/8 picture element interpolation unit is that tap coefficient is
0,0,0,0,0,0}, 0 ,-1,1,1 ,-1,0}, 3 ,-18,246,30 ,-6,1}, and 0 ,-1,1,1 ,-1,0}, 0,0,0,0,0,0}, and 0,0,0,0,0, the filter of 14 taps of 0}};
The filter of described two classes 1/8 picture element interpolation unit is that tap coefficient is
0,0,0,0,0,0}, 1 ,-3,2,1 ,-2,1}, 5 ,-29,189,108 ,-21,4}, and 1 ,-3,2,1 ,-2,1}, 0,0,0,0,0,0}, and 0,0,0,0,0, the filter of 18 taps of 0}};
The filter of described three classes 1/8 picture element interpolation unit is that tap coefficient is
0,0,3,1,0,0}, 1 ,-1 ,-14 ,-4 ,-1,0}, 4 ,-25,214,65 ,-13,2}, and 1 ,-5,27,9 ,-3,1}, 0,0 ,-6 ,-2,0,0}{0,0,1,1,0, the filter of 22 taps of 0}};
The filter of described four classes 1/8 picture element interpolation unit is that tap coefficient is
0,0,2,2,0,0}, 1 ,-1 ,-9 ,-9 ,-1,1}, 4 ,-26,145,145 ,-26,4}, and 1 ,-5,19,19 ,-5,1}, 0,0 ,-4 ,-4,0,0}, and 0,0,1,1,0, the filter of 24 taps of 0}};
The filter of described five classes 1/8 picture element interpolation unit is that tap coefficient is
0,0,4,2,0,0}, 0,0 ,-19 ,-11,0,0}, 4 ,-25,166,95 ,-18,3}, and 2 ,-9,51,31 ,-7,2}, 0,0 ,-11 ,-7,0,0}, and 0,0,2,1,0, the filter of 20 taps of 0}};
The filter of described six classes 1/8 picture element interpolation unit is that tap coefficient is
0,0,3,3,0,0}, 0,0 ,-17 ,-17,0,0}, 4 ,-20,113,113 ,-20,4}, and 2 ,-12,66,66 ,-12,2}, 0,0 ,-13 ,-13,0,0}, and 0,0,2,2,0, the filter of 20 taps of 0}};
The filter of described seven classes 1/8 picture element interpolation unit is that tap coefficient is
0,0,3,1,0,0}, 0 ,-1 ,-17 ,-2,0,0}, 3 ,-17,237,29 ,-6,1}, and 1 ,-2,29,5 ,-2,0}, 0,0 ,-6 ,-1,0,0}, and 0,0,1,0,0, the filter of 19 taps of 0}};
The filter of described eight classes 1/8 picture element interpolation unit is that tap coefficient is
0,0,2,1,0,0}, 1 ,-1 ,-12 ,-7 ,-1,0}, 5 ,-28,182,105 ,-20,4}, and 1 ,-5,24,15 ,-5,1}, 0,0 ,-5 ,-3,0,0}, and 0,0,1,1,0, the filter of 23 taps of 0}};
The filter of described nine classes 1/8 picture element interpolation unit is that tap coefficient is
0,0,4,3,0,0}, 0,0 ,-21 ,-13,0,0}, 4 ,-21,141,82 ,-16,3}, and 2 ,-13,82,48 ,-10,2}, 0,0 ,-16 ,-10,0,0}, and 0,0,3,2,0, the filter of 20 taps of 0}}.
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