CN103747269B - A kind of wave filter interpolation method and wave filter - Google Patents
A kind of wave filter interpolation method and wave filter Download PDFInfo
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Abstract
This application discloses a kind of wave filter interpolation method, including：Obtain the sequence information of video data sequences；The interpolation filter according to used in being determined the sequence information and pre-defined rule；Pixel precision is determined, and according to the pixel precision and the coefficient of the interpolation filter, insertion point pixel.Disclosed herein as well is a kind of wave filter.In the embodiment of the application, the interpolation filter according to used in being determined sequence information and pre-defined rule, and according to pixel precision and the coefficient of tap interpolation filter, calculate point pixel of insertion, the application according to sequence information, can automatically select the tap number of interpolation filter, be adaptively inserted a point pixel, coding efficiency is improved, the complexity of its interpolation calculation is reduced.
Description
Technical field
The application is related to field of video image processing, more particularly to a kind of wave filter interpolation method and wave filter.
Background technology
With numerous such as high definition digital products such as DTV, internet high-resolution video, digital camera, DVs
Gradually popularize, existing video encoding and decoding standard can not meet requirement, particularly with high resolution video, such as 4K × 2K
Very high resolution.It is therefore expected that adapting to the exploitation of the high-performance video coding standard of new generation of ultra high-definition video.
In video coding and decoding technology, image element interpolation technology can improve the degree of accuracy of motion prediction, so as to whole volume
The raising of decoding performance has very big positive role.Image element interpolation is only limitted to most early in just having been used in MPEG-1
Half pel motion estimates that precision and performance be not also high although being got well than the estimation of whole pixel motion；Carried since MPEG-4ASP
High interpolation precision, uses the interpolation of 1/4 pixel precision；H.264/AVC 6 tap filters are employed to obtain 1/2 picture
Element, then obtains 1/4 pixel with average filter, and performance has large increase；It is also in AVS Jizhun Profile
Employ 4 tap filters to obtain 1/2 pixel, 1/4 pixel is then drawn again；In nearest JCT-VC (the Joint
Collaborative Team on Video Coding) the high performance video encoding and decoding standard HEVC of future generation that is working out
In (High Efficiency Video Coding), it is further raising interpolation performance, employs high-performance detachable
Interpolation filter based on DCT, compared to many code checks are H.264/AVC reduced, can significantly improve coding efficiency, but it is inserted
It is worth the complexity calculated higher.
The content of the invention
The application technical problem to be solved is that there is provided a kind of wave filter interpolation method and filter in view of the shortcomings of the prior art
Ripple device.
According to the application's in a first aspect, the application provides a kind of wave filter interpolation method, including：
Obtain the sequence information of video data sequences；
The interpolation filter according to used in being determined the sequence information and pre-defined rule；
Pixel precision is determined, and according to the pixel precision and the coefficient of the tap interpolation filter, insertion point pixel
Point.
In the above method, the sequence information includes resolution ratio, frequency domain or texture.
In the above method, the sequence information is resolution ratio, and the pre-defined rule includes：
For the video data sequences of high resolution, using the interpolation filter of low tap；
For the low video data sequences of resolution ratio, using the interpolation filter of high tap.
In the above method, the pre-defined rule at least also includes：
When the resolution ratio of the video data sequences is more than or equal to 2560 × 1600, using 4 tap interpolation filters；
When the resolution ratio of the video data sequences is less than 2560 × 1600 and is more than or equal to 1280 × 720, taken out using 6
Head interpolation filter；
When the resolution ratio of the video data sequences is less than 1280 × 720, using 10 tap interpolation filters.
In the above method, the pixel precision is 1/4 pixel precision, and described point of pixel has 15.
In the above method, the interpolation coefficient of the 4 tap interpolation filter includes：The corresponding coefficient of 1/4 pixel for -6,
56,15,-1}；The corresponding coefficient of 2/4 pixel is { -4,36,36, -4 }；The corresponding coefficient of 3/4 pixel is { -1,15,56, -6 }.
In the above method, the interpolation coefficient of the 6 tap interpolation filter includes：The corresponding coefficient of 1/4 pixel for 2 ,-
9,57,17,-4,1}；The corresponding coefficient of 2/4 pixel is { 2, -9,39,39, -9,2 }；The corresponding coefficient of 3/4 pixel for 1, -4,
17,57,-9,2}。
In the above method, the interpolation coefficient of the 10 tap interpolation filter includes：The corresponding coefficient of 1/4 pixel for 1 ,-
2,4,-10,57,19,-7,3,-1,0}；The corresponding coefficient of 2/4 pixel is { 1, -2,5, -12,40,40, -12,5, -2,1 }, 3/4
The corresponding coefficient of pixel is { 0, -1,3, -7,19,57, -10,4, -2,1 }.
In the above method, the insertion point pixel is specifically included：
To the whole pixel of horizontal arest neighbors, the corresponding tap interpolation filter in 1/4,2/4 and 3/4 position is used
Coefficient, calculating obtains laterally point pixel；
To the whole pixel of longitudinal arest neighbors, the corresponding tap interpolation filter in 1/4,2/4 and 3/4 position is used
Coefficient, calculating obtains longitudinal direction point pixel；
For remaining point of pixel, first to the whole pixel of horizontal arest neighbors, respectively using 1/4,2/4 and 3/4 position
The coefficient of the corresponding tap interpolation filter, calculating obtains median, then to each median, respectively using 1/4,
The coefficient of the corresponding tap interpolation filter in 2/4 and 3/4 position, calculating obtains the remaining point of pixel.
According to the second aspect of the application, the application provides a kind of wave filter, right using above-mentioned wave filter interpolation method
Video image is handled.
As a result of above technical scheme, it is the beneficial effect that the application possesses：
(1) in the embodiment of the application, the tap used in being determined according to sequence information and pre-defined rule
Interpolation filter, and according to pixel precision and the coefficient of tap interpolation filter, insertion divides pixel, and the application can be according to sequence
Information, automatically selects the tap number of interpolation filter, is adaptively inserted a point pixel, improves coding efficiency, reduces it
The complexity of interpolation calculation.
(2) in the embodiment of the application, because sequence information includes resolution ratio, according to different resolution ratio, from
The interpolation filter of different taps is adaptively selected, high-resolution video sequence uses low tap filter, low resolution
Video sequence uses high tap filter, due to low tap filter better performances at high resolutions, and high tap filter
The better performances under low resolution, therefore optimal coding efficiency can be reached using the adaptive strategy of resolution ratio.
Brief description of the drawings
Fig. 1 is the flow chart of the wave filter interpolation method of the application in one embodiment；
Fig. 2 is the interpolation schematic diagram of the wave filter interpolation method of the application in one embodiment；
Fig. 3 is the actual Interpolation Process schematic diagram of the application.
Embodiment
The application is described in further detail below by embodiment combination accompanying drawing.
Embodiment one：
As shown in figure 1, the wave filter interpolation method of the application, a kind of its embodiment, comprise the following steps：
Step 102：Obtain the sequence information of video data sequences；Sequence information can include resolution ratio, frequency domain or line
The information such as reason.
Step 104：The tap interpolation filter according to used in being determined the sequence information and pre-defined rule；
Step 106：Pixel precision is determined, and according to the pixel precision and the coefficient of the tap interpolation filter, is inserted
Enter a point pixel.
The wave filter interpolation method of the application, its another embodiment comprises the following steps：
Step 202：Obtain the resolution ratio of video data sequences.Before this step, step can also be included：
In the data head of video data sequences, increase the syntactic element for flag sequence information.In present embodiment
In, increase the syntactic element for flag sequence information.
Step 204：The tap interpolation filter according to used in being determined resolution ratio and pre-defined rule.
In one embodiment, pre-defined rule includes：
For the video data sequences of high resolution, using the interpolation filter of low tap；
For the low video data sequences of resolution ratio, using the interpolation filter of high tap.
In another embodiment, pre-defined rule can also at least include：
When the resolution ratio of video data sequences is more than or equal to 2560 × 1600, using 4 tap interpolation filters；
When the resolution ratio of video data sequences is less than 2560 × 1600 and is more than or equal to 1280 × 720, inserted using 6 taps
Value filter；
When the resolution ratio of video data sequences is less than 1280 × 720, using 10 tap interpolation filters.
Step 206：Pixel precision is determined, and according to pixel precision and the coefficient of tap interpolation filter, insertion point pixel
Point.In present embodiment, pixel precision is 1/4 pixel precision, and a point pixel for insertion has 15.
The interpolation coefficient of 4 tap interpolation filters includes：The corresponding coefficient of 1/4 pixel is { -6,56,15, -1 }；2/4 picture
The corresponding coefficient of element is { -4,36,36, -4 }；The corresponding coefficient of 3/4 pixel is { -1,15,56, -6 }.
The coefficient of 4 tap interpolation filters is as shown in table 1：
| Divide location of pixels | Filter coefficient | Multiplication number | Addition number |
| 1/4 | { -6,56,15, -1 } | 3 | 3 |
| 2/4 | { -4,36,36, -4 } | 4 | 3 |
| 3/4 | { -1,15,56, -6 } | 3 | 3 |
Table 1
The interpolation coefficient of 6 tap interpolation filters includes：The corresponding coefficient of 1/4 pixel is { 2, -9,57,17, -4,1 }；2/
The corresponding coefficient of 4 pixels is { 2, -9,39,39, -9,2 }；The corresponding coefficient of 3/4 pixel is { 1, -4,17,57, -9,2 }.
The coefficient of 6 tap interpolation filters is as shown in table 2：
| Divide location of pixels | Filter coefficient | Multiplication number | Addition number |
| 1/4 | { 2, -9,57,17, -4,1 } | 5 | 5 |
| 2/4 | { 2, -9,39,39, -9,2 } | 6 | 5 |
| 3/4 | { 1, -4,17,57, -9,2 } | 5 | 5 |
Table 2
The interpolation coefficient of 10 tap interpolation filters includes：The corresponding coefficient of 1/4 pixel for 1, -2,4, -10,57,19, -
7,3,-1,0}；The corresponding coefficient of 2/4 pixel is { 1, -2,5, -12,40,40, -12,5, -2,1 }, the corresponding coefficient of 3/4 pixel
For { 0, -1,3, -7,19,57, -10,4, -2,1 }.
The coefficient of 10 tap interpolation filters is as shown in table 3：
Table 3
The wave filter interpolation method of the application, insertion point pixel, can specifically include：
To the whole pixel of horizontal arest neighbors, the corresponding tap interpolation filter in 1/4,2/4 and 3/4 position is used
Coefficient, calculating obtains laterally point pixel；
To the whole pixel of longitudinal arest neighbors, the corresponding tap interpolation filter in 1/4,2/4 and 3/4 position is used
Coefficient, calculating obtains longitudinal direction point pixel；
For remaining point of pixel, first to the whole pixel of horizontal arest neighbors, respectively using 1/4,2/4 and 3/4 position
The coefficient of the corresponding tap interpolation filter, calculating obtains median, then to each median, respectively using 1/4,
The coefficient of the corresponding tap interpolation filter in 2/4 and 3/4 position, calculating obtains the remaining point of pixel.
The wave filter interpolation method of the application, by taking 6 tap filters as an example, process is as follows：To the whole picture of horizontal arest neighbors
Vegetarian refreshments obtains a point pixel a using 6 tap filtering interpolations00、b00、c00；6 tap interpolation are used to the whole pixel of longitudinal arest neighbors
Filtering obtains a point pixel d00、h00、n00；It is that first the whole pixel of horizontal arest neighbors is inserted using 6 taps for remaining point of pixel
Value filtering obtains median, then uses 6 tap filtering interpolations of longitudinal direction to median again.
The wave filter interpolation method of the application, the calculating of its interpolation point, as shown in figure 3, specifically including：
The first step：According to table 4, point pixel of wanted interpolation is judged by x and y coordinate.Wherein, table 4 is
Divide pixel and coordinate position mapping table.
| X-coordinate | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 3 |
| Y-coordinate | 0 | 1 | 2 | 3 | 0 | 1 | 2 | 3 | 0 | 1 | 2 | 3 | 0 | 1 | 2 | 3 |
| Divide pixel | A | d | h | n | a | e | i | p | b | f | j | q | c | g | k | r |
Table 4
Point pixel of insertion is as shown in Fig. 2 the position A that capitalization is represented0,0、A0,1、A1,0And A1,1To be known whole
Pixel, the position that lowercase is represented is needs point pixel that interpolation obtains.
Second step：By the judgement of previous step, corresponding image element interpolation processing procedure is respectively enterd.Such as a point pixel
A, it is only necessary to carry out 6 horizontal tap filtering interpolations, use the corresponding filter coefficient in 1/4 position；It is first for a point pixel e
6 horizontal tap filtering interpolations are carried out, using the corresponding filter coefficient in 1/4 position, 6 longitudinal tap interpolation are then carried out again
Filtering, uses the corresponding filter coefficient in 1/4 position.
The Interpolation Process of each point is as follows：
(1) pixel a is divided00、b00、c00Interpolation：6 tap filtering interpolations are used to the whole pixel of horizontal arest neighbors, respectively
Using the corresponding filter coefficient in 1/4,2/4,3/4 position, calculating obtains corresponding point of pixel a00、b00、c00, calculation formula is such as
Under：
a0,0=(2 × A-2,0-9×A-1,0+57×A0,0+17×A1,0-4×A2,0+A3,0) ＞ ＞ shift1
b0,0=(2 × A-2,0-9×A-1,0+39×A0,0+39×A1,0-9×A2,0+2×A3,0) ＞ ＞ shift1
c0,0=(A-2,0-4×A-1,0+17×A0,0+57×A1,0-9×A2,0+2×A3,0) ＞ ＞ shift1
(2) pixel d is divided00、h00、n00Interpolation：6 tap filtering interpolations are used to the whole pixel of longitudinal arest neighbors, respectively
Using the corresponding filter coefficient in 1/4,2/4,3/4 position, calculating obtains corresponding point of pixel d00、h00、n00, calculation formula is such as
Under：
d0,0=(2 × A0,-2-9×A0,-1+57×A0,0+17×A0,1-4×A0,2+A0,3) ＞ ＞ shift1
h0,0=(2 × A0,-2-9×A0,-1+39×A0,0+39×A0,1-9×A0,2+2×A0,3) ＞ ＞ shift1
n0,0=(A0,-2-4×A0,-1+17×A0,0+57×A0,1-9×A0,2+2×A0,3) ＞ ＞ shift1
(3) pixel e is divided0,0、i0,0、p0,0Interpolation：6 tap filtering interpolations first are used to the whole pixel of horizontal arest neighbors,
Using the corresponding filter coefficient in 1/4 position, so as to obtain median a '0,i（Wherein i=- 3~4）, a '0,iWith a0,iDifference is
a′0,iThere is no last shift1 shifting functions；Then again to median a '0,iUsing 6 tap filtering interpolations of longitudinal direction, use respectively
The corresponding filter coefficient in 1/4,2/4,3/4 position, calculating obtains corresponding point of pixel e0,0、i0,0、p0,0, calculation formula is such as
Under：′
e0,0=(2 × a'0,-2-9×a'0,-1+57×a'0,0+17×a'0,1-4×a'0,2+a'0,3) ＞ ＞ shift2
i0,0=(2 × a'0,-2-9×a'0,-1+39×a'0,0+39×a'0,1-9×a'0,2+2×a'0,3) ＞ ＞ shift2
p0,0=(a'0,-2-4×a'0,-1+17×a'0,0+57×a'0,1-9×a'0,2+2×a'0,3) ＞ ＞ shift2
(4) pixel f is divided0,0、j0,0、q0,0Interpolation：6 tap filtering interpolations first are used to the whole pixel of horizontal arest neighbors,
Using the corresponding filter coefficient in 2/4 position, so as to obtain median b '0,i（Wherein i=- 3~4）；Then again to median
b′0,iUsing 6 tap filtering interpolations of longitudinal direction, respectively using 1/4, the corresponding filter coefficient in 2/4,3/4 position, calculating is obtained pair
Point pixel f answered0,0、j0,0、q0,0, calculation formula is as follows：
f0,0=(2 × b'0,-2-9×b'0,-1+57×b'0,0+17×b'0,1-4×b'0,2+b'0,3) ＞ ＞ shift2
j0,0=(2 × b'0,-2-9×b'0,-1+39×b'0,0+39×b'0,1-9×b'0,2+2×b'0,3) ＞ ＞ shift2
q0,0=(b'0,-2-4×b'0,-1+17×b'0,0+57×b'0,1-9×b'0,2+2×b'0,3) ＞ ＞ shift2
(5) pixel g is divided0,0、k0,0、r0,0Interpolation：6 tap filtering interpolations first are used to the whole pixel of horizontal arest neighbors,
Using the corresponding filter coefficient in 3/4 position, so as to obtain median c '0,i（Wherein i=- 3~4）；Then again to median
c′0,iUsing 6 tap filtering interpolations of longitudinal direction, respectively using 1/4, the corresponding filter coefficient in 2/4,3/4 position, calculating is obtained pair
Point pixel g answered0,0、k0,0、r0,0, calculation formula is as follows：
g0,0=(2 × c'0,-2-9×c'0,-1+57×c'0,0+17×c'0,1-4×c'0,2+c'0,3) ＞ ＞ shift2
k0,0=(2 × c'0,-2-9×c'0,-1+39×c'0,0+39×c'0,1-9×c'0,2+2×c'0,3) ＞ ＞ shift2
r0,0=(c'0,-2-4×c'0,-1+17×c'0,0+57×c'0,1-9×c'0,2+2×c'0,3) ＞ ＞ shift2
In above-mentioned formula, ">>" represent to move to right, shift1=6, shift2=12.So, 15 points of all pixels are all
It is interpolated out.
The wave filter interpolation method of the application and HEVC brightness interpolating are contrasted, each resolution video it is Encoding bright
Aobvious to improve, its Y, U, V code check reduces -1.0%, -0.6%, -0.6% respectively, especially for very HD video (2560x1600
Resolution ratio) performance improve be especially apparent.Table 5 is that the filter coefficients method of the application is contrasted with the code check of HEVC luminance interpolating methods
As a result table.
Table 5
The wave filter interpolation method of the application of table 6 and the maximum memory access pixel comparison result of HEVC luminance interpolating methods.
Table 6
Table 7 is the wave filter interpolation method of the application and the multiplication number comparing result of HEVC luminance interpolating methods.
Table 7
Table 8 is number of additions comparing result of the method with HEVC luminance interpolating methods of the present invention.
Table 8
Low tap filter is used at high resolutions, can substantially reduce memory access and computation complexity.Contrast the present invention with
HEVC computation complexity, and table 6~8 are understood（W and L represent the wide and length of an image block）；4 tap filters and 6 taps
Memory access, multiplication number and the addition number of wave filter of the wave filter with respect to HEVC are greatly reduced, the multiplication number of especially 4 taps and
Addition number only accounts for 1/3rd of HEVC or so respectively；The complexity of 10 tap filters is many compared with HEVC liftings, but for
The Video coding of low resolution, influence is little.Therefore the volume of high-definition picture can be greatly reduced using the method for the present invention
Code decoding complex degree, so as to accelerate the speed of coding.
Embodiment two：
The wave filter of the application, using the wave filter interpolation method in embodiment one, is handled video image.
Above content is to combine the further description that specific embodiment is made to the application, it is impossible to assert this Shen
Specific implementation please is confined to these explanations.For the application person of an ordinary skill in the technical field, do not taking off
On the premise of from the application design, some simple deduction or replace can also be made.
Claims (5)
1. a kind of wave filter interpolation method, it is characterised in that including：
Obtain the sequence information of video data sequences；
The interpolation filter according to used in being determined the sequence information and pre-defined rule；
Pixel precision is determined, and according to the pixel precision and the coefficient of the interpolation filter, insertion point pixel；
The pre-defined rule at least also includes：
When the resolution ratio of the video data sequences is more than or equal to 2560 × 1600, using 4 tap interpolation filters；
When the resolution ratio of the video data sequences is less than 2560 × 1600 and is more than or equal to 1280 × 720, inserted using 6 taps
Value filter；
When the resolution ratio of the video data sequences is less than 1280 × 720, using 10 tap interpolation filters；
The interpolation coefficient of the 4 tap interpolation filter includes：The corresponding coefficient of 1/4 pixel is { -6,56,15, -1 }；2/4 picture
The corresponding coefficient of element is { -4,36,36, -4 }；The corresponding coefficient of 3/4 pixel is { -1,15,56, -6 }；
The interpolation coefficient of the 6 tap interpolation filter includes：The corresponding coefficient of 1/4 pixel is { 2, -9,57,17, -4,1 }；2/
The corresponding coefficient of 4 pixels is { 2, -9,39,39, -9,2 }；The corresponding coefficient of 3/4 pixel is { 1, -4,17,57, -9,2 }；
The interpolation coefficient of the 10 tap interpolation filter includes：The corresponding coefficient of 1/4 pixel for 1, -2,4, -10,57,19, -
7,3,-1,0}；The corresponding coefficient of 2/4 pixel is { 1, -2,5, -12,40,40, -12,5, -2,1 }, the corresponding coefficient of 3/4 pixel
For { 0, -1,3, -7,19,57, -10,4, -2,1 }.
2. wave filter interpolation method as claimed in claim 1, it is characterised in that the sequence information includes resolution ratio, frequency
Domain or texture.
3. wave filter interpolation method as claimed in claim 2, it is characterised in that the sequence information is resolution ratio, described pre-
Set pattern then includes：
For the video data sequences of high resolution, using the interpolation filter of low tap；
For the low video data sequences of resolution ratio, using the interpolation filter of high tap.
4. wave filter interpolation method as claimed in claim 1, it is characterised in that the pixel precision is 1/4 pixel precision, institute
Stating a point pixel has 15.
5. wave filter interpolation method as claimed in claim 1, it is characterised in that the insertion point pixel, is specifically included：
To the whole pixel of horizontal arest neighbors, what it is using the corresponding tap interpolation filter in 1/4,2/4 and 3/4 position is
Number, calculating obtains laterally point pixel；
To the whole pixel of longitudinal arest neighbors, what it is using the corresponding tap interpolation filter in 1/4,2/4 and 3/4 position is
Number, calculating obtains longitudinal direction point pixel；
It is corresponding with 3/4 position using 1/4,2/4 respectively first to the whole pixel of horizontal arest neighbors for remaining point of pixel
The tap interpolation filter coefficient, calculating obtains median, then to each median, respectively using 1/4,2/4
The coefficient of the tap interpolation filter corresponding with 3/4 position, calculating obtains the remaining point of pixel.
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