CN102223538A - Parallel filtering method and device - Google Patents
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- CN102223538A CN102223538A CN2011101637691A CN201110163769A CN102223538A CN 102223538 A CN102223538 A CN 102223538A CN 2011101637691 A CN2011101637691 A CN 2011101637691A CN 201110163769 A CN201110163769 A CN 201110163769A CN 102223538 A CN102223538 A CN 102223538A
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- H04N19/85—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression
- H04N19/86—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression involving reduction of coding artifacts, e.g. of blockiness
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- H04N19/42—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation
- H04N19/436—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation using parallelised computational arrangements
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- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
- H04N19/61—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding in combination with predictive coding
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Abstract
The invention provides a parallel filtering method. The parallel filtering method comprises the following steps that: an image processing module I performs independent code processing except loop filtering on an i image in N images obtained by vertically dividing a frame image to be coded from left to right, wherein i is equal to one of 0 to (N-1), N is more than or equal to 2; the image processing module I parallelly performs loop filtering on the images which are respectively subjected to the independent code processing, wherein i is equal to one of 0 to (N-1); and the image processing module I does not perform loop filtering on the leftmost vertical boundary of a first-row macro block of the i image, wherein i is equal to one of 1 to (N-1). The invention also provides a parallel filtering device. The method and the device are simple in implementation, have low influence on the image quality, and greatly improve the processing efficiency.
Description
Technical field
The present invention relates to video image and handle, relate in particular to a kind of method and apparatus of parallel filtering.
Background technology
At present, HD video has become the focus in market, and than SD, the advantage of high-definition image is the resolution height, and details is clear.But thing followed problem is that it also is that index rises that the processing resource consumption that high-definition image brought is compared with SD.With regard to 720P, resolution is more than 2 times of 4cif, and 1080I/P is more than 5 times of 4cif, so high resolution means highdensity data processing, this is a challenge greatly for DSP (Digital Signal Processing, Digital Signal Processing) disposal ability.The high-definition image video is towards the development of 1440P ultra high-definition now, and multinuclear or multi-disc dsp code one road HD video become essential scheme.The video encoding standard of holding in both hands be heated most simultaneously in the market H.264, is a kind of agreement of high complexity, and this more makes the DSP disposal ability of original deficiency have too many difficulties to cope with.
So when the disposal ability of single dsp chip was not enough to independently finish high-definition image (particularly 1080I/P) task, many producers are numerous and confused to adopt many dsp chips to finish the high-definition image coding jointly also just to have become the way of having no idea.Below many dsp chips coding do not make specified otherwise, all refer to the biplate coding.
For agreement H.264, the main process of the two field picture of encoding has: prediction (comprising infra-frame prediction and inter prediction), dct transform, quantification, entropy coding, inverse quantization, anti-dct transform, filtering.Image after the filtering is as the predicted picture of successive image.These processes except filtering, all are that the reference value required such as infra-frame prediction can not surmount the slice border in slice (sheet) inside.So, when with image division into two the time, biplate can independent process, because required data are all in current slice inside, just the operational data of current dsp chip is concentrated, and can not exist the data of second DSP needs will wait for that first DSP handles and could begin.
But filtering H.264 is an exception, and its filtering is that whole frame carries out filtering, and carries out in strict accordance with the raster scan order of macro block, is the parallel part that breaks least easily.Concerning certain specific macroblock, the necessary condition that it can filtering is: the left adjacent macroblocks of current macro and last adjacent macroblocks have all been finished filtering.If strictly observe agreement, whole frame sequential filtering, two essential mutual grades of chip just can be carried out filtering, like this, first in filtering, in second its tangible idle waiting, this is beyond doubt to the waste of DSP resource.
H.264/AVC in the video encoding standard, the codec inverse transformation quantizes the back image and blocking artifact occurs, its reason: one introduces by quantizing, and two are introduced by motion compensated prediction.The way that addresses this problem is exactly filtering, and filtering has two kinds: post-filtering and loop filtering.Post-filtering is not standardized normative content, is an option in standard.Different therewith, loop filtering is handled the data in the coding loop.In coding, filtered image is as the reference frame of next code frame estimation, and in decoding, filtered image output shows.This requires the decoder of all and conformance to standard to adopt a filter and encoder synchronous.
H.264/AVC loop filtering is that unit carries out filtering with 4x4, has filtered a macro block and has filtered next macro block again.Interior macroblocks is the filter vertical boundary earlier, the flat border of back drainage, and vertical boundary is gone up afterwards earlier, and horizontal boundary is the left back right side earlier.As shown in Figure 1.
For each luminance macroblock earlier to the leftmost boundary filtering of macro block, a among Fig. 1, three vertical boundaries in the macro block from left to right successively then, as the b among Fig. 1 to d.To horizontal boundary earlier to top boundary filtering, as the e among Fig. 1, three horizontal boundaries in the macro block under last successively then, promptly from Fig. 1 f to h.
H.264 loop filtering is based on the macroblock basis, and previous macro block filtering just can carry out the filtering of next macro block, and filtering is to be undertaken by the macro block raster scan order.The filtered macroblock order as shown in Figure 2.Because H.264 loop filtering has strict filter sequence, so, in the multi-disc coding, multi-disc parallel not too easy.Sheet 1 wait sheet 0 has been filtered delegation's macro block and has been carried out filtering again, and DSP efficient is reduced greatly.
For the coding of HD video H.264 multi-disc solution, how parallel filtering is a difficult problem, and is the difficult problem that must solve.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of parallel filtering method and apparatus, improves resource utilization ratio and treatment effeciency.
In order to address the above problem, the invention provides a kind of parallel filtering method, comprising:
Image processing module i to a two field picture to be encoded from left to right the absolute coding that carries out except that loop filtering of the i picture in the N picture that obtains of vertical segmentation handle, i=0...N-1, N is more than or equal to 2;
Image processing module i, i=0...N-1 is parallel to carry out loop filtering to the image after absolute coding is handled separately and handles, and wherein, image processing module i, i=1...N-1 do not carry out loop filtering to the most left vertical boundary of the first row macro block of i picture to be handled.
Further, said method also can have following characteristics, and described method also comprises, data after image processing module i and the mutual filtering of image processing module i+1, and data are used for the absolute coding processing and the loop filtering processing of next frame, i=0...N-2 after this filtering.
Further, said method also can have following characteristics, and described N picture size is identical.
Further, said method also can have following characteristics, and described N picture size is not identical entirely.
Further, said method also can have following characteristics, and described image processing module i, i=0...N-1 are digital signal processing chip.
The present invention also provides a kind of parallel filtering device, comprising: N image processing module is numbered 0 to N-1, wherein:
Described image processing module 0 is used for: to a two field picture to be encoded from left to right the absolute coding that carries out except that loop filtering of the 0th picture of the N picture that obtains of vertical segmentation handle, and, with other N-1 image processing module is parallel image after absolute coding is handled is separately carried out the loop filtering processing, in the described N picture, its numbering is 0...N-1 from left to right;
Described image processing module i, i=1...N-1 is used for: to a two field picture to be encoded from left to right the absolute coding that carries out except that loop filtering of the i picture of the N picture that obtains of vertical segmentation handle, and, image after absolute coding is handled is separately carried out loop filtering handle with other N-1 image processing module is parallel, and the most left vertical boundary of the first row macro block of i picture is not carried out loop filtering and handle.
Further, said apparatus also can have following characteristics, described image processing module i, and i=0...N-2 also is used for: and data after the mutual filtering of image processing module i+1, data are used for the absolute coding processing and the loop filtering processing of next frame, i=0...N-2 after this filtering.
Further, said apparatus also can have following characteristics, and described N picture size is identical.
Further, said apparatus also can have following characteristics, and described N picture size is not identical entirely.
Further, said apparatus also can have following characteristics, and described image processing module i, i=0..N-1 are digital signal processing chip.
Parallel filtering method and apparatus provided by the invention is divided into multi-disc with the image vertical direction, during filtering, not to the most left vertical boundary filtering of each picture except that one picture of the left side, has realized the processing of multi-disc parallel filtering.The present invention realizes simply, and is less to the picture quality influence, improved treatment effeciency greatly.
Description of drawings
Fig. 1 is a luminance filtering order in the macro block;
Fig. 2 is the filtered macroblock order;
Fig. 3 is a handkerchief slice stripe sequence;
Fig. 4 is that right half part image the 1st row macro block is divided into same slice schematic diagram;
Fig. 5 is a biplate DSP parallel filtering method filter sequence schematic diagram simultaneously;
Fig. 6 is the biplate DSP filtering method of encoding simultaneously;
Fig. 7 is that multi-disc DSP situation hypograph slice divides schematic diagram;
Fig. 8 is the multi-disc DSP filtering method of encoding simultaneously.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, hereinafter will be elaborated to embodiments of the invention in conjunction with the accompanying drawings.Need to prove that under the situation of not conflicting, embodiment among the application and the feature among the embodiment be combination in any mutually.
Core concept of the present invention is: the image vertical direction is divided into multi-disc, during filtering, to the most left vertical boundary filtering of each picture except that Far Left one picture, does not realize the multi-disc parallel processing.
The invention provides a kind of parallel filtering method, comprising:
Image processing module i to a two field picture to be encoded from left to right the absolute coding that carries out except that loop filtering of the i picture in the N picture that obtains of vertical segmentation handle, i=0...N-1, N is more than or equal to 2;
Image processing module i, i=0...N-1 is parallel to carry out loop filtering to the image after absolute coding is handled separately and handles, and wherein, image processing module i, i=1...N-1 do not carry out loop filtering to the most left vertical boundary of the first row macro block of i picture to be handled.
Data after image processing module i and the mutual filtering of image processing module i+1, data are used for the absolute coding processing and the loop filtering processing of next frame, i=0...N-2 after this filtering.
Wherein, described N picture size is identical, and perhaps, described N picture size is not identical entirely.
Wherein, described image processing module is a dsp chip, certainly, also can be other picture processing chips.
The present invention uses handkerchief slice based on when coding, and the division of handkerchief slice is from top to bottom, from left to right divides slice, as shown in Figure 3.
Be encoded to example with biplate, the specific implementation of carrying out the two-way parallel filtering is described.
The present invention is at the image segmentation place, with the most left 1 row macroblock partitions of image right half part is a slice, forbid this slice vertical boundary filtering, like this, in fact for vertical filtering without any influence, unique influence be horizontal direction filtering because the just slice border of influence, still carry out filtering for non-border, so its influence is very little.Then do not need to do the normal filtering of any processing for the left-half image.Because partitioning portion does not carry out filtering, the filtering of two halves image can independently be carried out.The concrete division as shown in Figure 4.
As shown in Figure 6, comprising:
Step 601: image is divided into left and right sides two halves, the DSP0 left-half of encoding, the DSP1 right half part of encoding.
During division, left-half and right half part size can be identical or different.
With handkerchief slice order from top to bottom, partitioned image from left to right.
In step 602:DSP1 when coding, become same slice with the first row macroblock partitions of right half part image, and this slice is set does not carry out the slice boundary filtering.As shown in Figure 4.H.264 agreement becomes subimage one by one to encode separately image segmentation in order to adapt to network, and these subimages are exactly slice, its minimum unit is a macro block, that is to say that slice must comprise several macro blocks, can be 1, also can be all macro blocks of whole two field picture.Independently be independent of each other between the Slice, can encode separately by different chips.And filtering is not in slice inside, but after all slice finished coding, whole frame carried out filtering.The first row macro block of right half part image is included in a purpose in the slice, exactly because the filtering of this row macro block could begin filtering after need waiting for left-half filtering.The present invention program, the slice at this row macro block place is arranged to not filtering of border, so-called slice not filtering of border is specific to certain macro block, as shown in Figure 1, for vertical boundary, the a border is the left margin of macro block, also is simultaneously slice border herein, because this slice only comprises a row macro block, so border not filtering of e, other borders such as b, c, d then still can carry out filtering.So only influenced a border, for the not influence of other vertical boundaries.And for horizontal boundary, the division methods of this programme is to not influence of horizontal boundary.Because just border of influence does not influence picture quality substantially.
Step 603:DSP0 and the DSP1 two field picture that begins to encode mainly carries out independently slice cataloged procedure, comprises infra-frame prediction and inter prediction, dct transform, quantification, entropy coding, inverse quantization, anti-dct transform.These processes all can independently be carried out in slice inside.
Step 604:DSP0 and DSP1 absolute coding are finished, and need carry out loop filtering, if the single-chip coding is then put in order frame from left to right from top to bottom by the filtering of macro block raster scan order.As shown in Figure 5, because the slice at the right half part image first row macro block place has been arranged to not filtering of border, this just makes DSP1 not need to wait for that DSP0 filtering is finished just begins filtering, but can directly begin filtering, does not just carry out filtering at boundary.The complete independent filtering of DSP0 and DSP1 has improved treatment effeciency greatly.
Data after step 605:DSP0 and DSP1 exchange one row or the multiple row filtering, for referencial use for the absolute coding processing and the Filtering Processing of next frame.
Step 606: when subsequent frame is carried out filtering, repeating step 603～step 605.
If the situation of N (N＞2) dsp code filtering is an example with N=3, as shown in Figure 8, comprising:
Step 801: current pending high-definition image frame is divided into left half, mid portion and right half according to two vertical dividers;
The processing of follow-up other frames with step 803 to 805.
The situation of N＞3 and the processing of N=3 are similar.
The present invention also provides a kind of parallel filtering device, comprising: N image processing module is numbered 0 to N-1, wherein:
Described image processing module 0 is used for: to a two field picture to be encoded from left to right the absolute coding that carries out except that loop filtering of the 0th picture of the N picture that obtains of vertical segmentation handle, and, with other N-1 image processing module is parallel image after absolute coding is handled is separately carried out the loop filtering processing, in the described N picture, its numbering is 0..N-1 from left to right;
Described image processing module i, i=1...N-1 is used for: to a two field picture to be encoded from left to right the absolute coding that carries out except that loop filtering of the i picture of the N picture that obtains of vertical segmentation handle, and, image after absolute coding is handled is separately carried out loop filtering handle with other N-1 image processing module is parallel, and the most left vertical boundary of the first row macro block of i picture is not carried out loop filtering and handle.
Described image processing module i, i=0...N-2 also is used for: and data after the mutual filtering of image processing module i+1, data are used for the absolute coding processing and the loop filtering processing of next frame, i=0...N-2 after this filtering.
Wherein, described N picture size is identical.Described N picture size is not identical entirely.
Wherein, described image processing module i, i=0..N-1 are digital signal processing chip.
Under the situation that amount of exercise is big on some video scene vertical direction, more violent than horizontal direction such as traffic route high definition monitoring video moving scene vertical direction.With the image vertical segmentation into two, after cutting apart like this, a slice dsp chip is handled half image, handles left-half such as DSP0, and DSP1 handles the right half part image.At this moment, utilization the present invention program can realize more high compression efficiency, reaches the filtering of biplate independence simultaneously, the degree of parallelism height.
H.264 the present invention can be applied to, and also can be applied to other and similar agreement H.264.
The scheme that the present invention proposes, it is fairly simple on technology realizes, on the prerequisite that does not influence subjective picture quality, the data that well solved when multi-disc is carried out filtering rely on problem, make multi-disc filtering parallel fully, and complete protocol compliant, it is inconsistent and cause the phenomenon of flower screen to occur can not produce encoding and decoding.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
Claims (10)
1. a parallel filtering method is characterized in that, comprising:
Image processing module i to a two field picture to be encoded from left to right the absolute coding that carries out except that loop filtering of the i picture in the N picture that obtains of vertical segmentation handle, i=0...N-1, N is more than or equal to 2;
Image processing module i, i=0...N-1 is parallel to carry out loop filtering to the image after absolute coding is handled separately and handles, and wherein, image processing module i, i=1...N-1 do not carry out loop filtering to the most left vertical boundary of the first row macro block of i picture to be handled.
2. the method for claim 1 is characterized in that, described method also comprises, data after image processing module i and the mutual filtering of image processing module i+1, and data are used for the absolute coding processing and the loop filtering processing of next frame, i=0...N-2 after this filtering.
3. method as claimed in claim 1 or 2 is characterized in that, described N picture size is identical.
4. method as claimed in claim 1 or 2 is characterized in that, described N picture size is not identical entirely.
5. method as claimed in claim 1 or 2 is characterized in that, described image processing module i, i=0...N-1 are digital signal processing chip.
6. a parallel filtering device is characterized in that, comprising: N image processing module is numbered 0 to N-1, wherein:
Described image processing module 0 is used for: to a two field picture to be encoded from left to right the absolute coding that carries out except that loop filtering of the 0th picture of the N picture that obtains of vertical segmentation handle, and, with other N-1 image processing module is parallel image after absolute coding is handled is separately carried out the loop filtering processing, in the described N picture, its numbering is 0..N-1 from left to right;
Described image processing module i, i=1...N-1 is used for: to a two field picture to be encoded from left to right the absolute coding that carries out except that loop filtering of the i picture of the N picture that obtains of vertical segmentation handle, and, image after absolute coding is handled is separately carried out loop filtering handle with other N-1 image processing module is parallel, and the most left vertical boundary of the first row macro block of i picture is not carried out loop filtering and handle.
7. device as claimed in claim 6 is characterized in that,
Described image processing module i, i=0...N-2 also is used for: and data after the mutual filtering of image processing module i+1, data are used for the absolute coding processing and the loop filtering processing of next frame, i=0...N-2 after this filtering.
8. as claim 6 or 7 described devices, it is characterized in that described N picture size is identical.
9. as claim 6 or 7 described devices, it is characterized in that described N picture size is not identical entirely.
10. as claim 6 or 7 described devices, it is characterized in that described image processing module i, i=0..N-1 are digital signal processing chip.
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| PCT/CN2012/073777 WO2012171401A1 (en) | 2011-06-17 | 2012-04-11 | Parallel filtering method and apparatus |
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| WO2012171401A1 (en) * | 2011-06-17 | 2012-12-20 | 中兴通讯股份有限公司 | Parallel filtering method and apparatus |
| CN103636227A (en) * | 2012-02-03 | 2014-03-12 | 联发科技股份有限公司 | Method and apparatus for loop filtering cross tile or slice boundaries |
| CN103947213A (en) * | 2011-10-28 | 2014-07-23 | 高通股份有限公司 | Loop filtering control over tile boundaries |
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| CN102223538A (en) * | 2011-06-17 | 2011-10-19 | 中兴通讯股份有限公司 | Parallel filtering method and device |
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| WO2012171401A1 (en) * | 2011-06-17 | 2012-12-20 | 中兴通讯股份有限公司 | Parallel filtering method and apparatus |
| CN103947213A (en) * | 2011-10-28 | 2014-07-23 | 高通股份有限公司 | Loop filtering control over tile boundaries |
| CN103947213B (en) * | 2011-10-28 | 2017-05-24 | 高通股份有限公司 | Loop filtering control over tile boundaries |
| CN103636227A (en) * | 2012-02-03 | 2014-03-12 | 联发科技股份有限公司 | Method and apparatus for loop filtering cross tile or slice boundaries |
| CN103636227B (en) * | 2012-02-03 | 2017-07-07 | 寰发股份有限公司 | Through segment or the loop circuit filtering method and its device of band boundaries |
| US9967563B2 (en) | 2012-02-03 | 2018-05-08 | Hfi Innovation Inc. | Method and apparatus for loop filtering cross tile or slice boundaries |
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| WO2012171401A1 (en) | 2012-12-20 |
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Application publication date: 20111019 |