CN102447907A - Video sequence coding method aiming at HEVC (High Efficiency Video Coding) - Google Patents
Video sequence coding method aiming at HEVC (High Efficiency Video Coding) Download PDFInfo
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Abstract
The invention relates to a video sequence coding method aiming at HEVC (High Efficiency Video Coding), and the method is good in compaction effect, low in complexity and suitable for practical application. The video sequence coding method comprises the following steps of: (1) obtaining a prediction block according to the brightness component of a PU (Prediction Unit), subtracting an original value to obtain residual, and dividing based on the rate-distortion cost to obtain a TU (Transformation Unit); (2) determining whether the current TU selects to transform or not according to the minimum rate-distortion cost principle; (3) quantizing by utilizing a relative method, and transmitting marks of a quantization coefficient and transformation or non-transformation to a decoding end; (4) reading out the marks and judging whether inverse transformation is executed or not at the decoding end by each TU; (5) executing corresponding inverse quantization according to the read marks by each TU; (6) deciding whether the inverse transformation is executed according to the read marks, and executing corresponding operations; and (7) combining TUs to be the PU, and adding the PU with a prediction value, obtained through motion compensation, of the current PU to obtain a reconfiguration value of the PU so as to reconfigure a current CU (Coding Unit).
Description
Technical field
The invention belongs to the technical field of video coding, relate to a kind of coding method of video sequence particularly towards HEVC (High efficiency video coding, efficient video coding).
Background technology
The application of H.264 (perhaps being AVC) is very ripe, from the video monitoring to the Streaming Media, down to the personal consumption electron-like, has all adopted H.264 video encoding and decoding standard.H.265 (perhaps be HEVC), be in the process of standard formulation at present.HEVC is than coding standard more efficiently H.264, organize to set up by JCT-VC (A Joint Collaborative Team on Video Coding), target be same video quality (PSNR) down code check be reduced to H.264 50%.This is a very considerable index, if really can reach this target, high definition transmission will further reduce the requirement of bandwidth, and certain, the complexity of HEVC also will increase greatly, might be H.264 more than 3 times.
At present, proposed the new features of many codings in the discussion of JCT-VC tissue, might add in the HEVC standard, as shown in Figure 1.The big young pathbreaker of piece of coding breaks through traditional 16 * 16 macroblock size; Maximum can reach 64 * 64 size; This mainly is the application for the high definition compressed encoding, and like the video of 1080p even bigger resolution, the consistency on its space possibly have more large tracts of land after all; Therefore adopt 16 * 16 macroblock size no longer suitable, and adopt the redundancy that bigger macro block can more effective minimizing space.The matrix size of transition coding is also becoming big, have in H.264 and adopt 8 * 8 DCT, and HEVC breaks through 8 * 8, and maximum can arrive 32 * 32.For infra-frame prediction, the refinement more of the direction of prediction reaches 34 kinds of infra-frame prediction modes, and this will make infra-frame prediction more accurate, and more effective minimizing is redundant.Inter prediction has adopted more multitap filter when interpolation, and to 1/4 pixel precision, this can both improve the precision of inter prediction, and estimation is also more accurate in addition.Entropy coding always all is a link very important in the video compression coding; HEVC will adopt adaptability stronger based on contextual self adaptation coding (the Context-based Adaptive Binary Arithmetic Coding that counts; The entropy coding of a low complex degree has also been proposed abbreviation CABAC), simultaneously.Loop filtering also improves, and mainly is the content local edge of considering video, makes it more flexible, improves the subjective effect of video.
Transition coding part in HEVC, each converter unit are carried out 2 dimension dct transforms, and size from 8 * 8 to 32 * 32, but some image block are like vision-mix or some sparse graph pictures and be not suitable for the process of transition coding." Enable efficient compound image compression in is intra coding H.264/AVC " (Proc.Int.Conf.Image Processing; Oct.2007; Vol.2 pp.337-340) proposes some image blocks are skipped the process of transition coding, lets its adaptive selection whether adopt transition coding; But just be applied in the intraframe coding, compression effectiveness is not so good." Transform skip mode " (JCT-VC G575,7th Meet ing:Geneva, CH; 21-30November, 2011) propose an image block is adopted two-dimensional transform one-dimensional transform and transform method not; But the complexity of this method is high, and is not suitable for practical application.
Summary of the invention
Technology of the present invention is dealt with problems and is: overcome the deficiency of prior art, provide that a kind of compression effectiveness is good, complexity is low, be suitable for the coding method of video sequence to HEVC of practical application.
Technical solution of the present invention is: this coding method of video sequence to HEVC may further comprise the steps:
(1) for the luminance component among the predicting unit PU, obtain its predict blocks, and then subtract each other with original value and to obtain residual error, carry out division based on rate distortion costs, obtain converter unit TU;
(2) confirm that current TU selects whether to carry out conversion according to the minimum principle of rate distortion costs;
(3) quantize with corresponding method, and quantization parameter and the sign that whether carries out conversion are reached decoding end;
(4) in decoding end, each TU reads sign and judges whether to carry out inverse transformation;
(5) each TU carries out corresponding inverse quantization according to the sign of reading;
(6) whether carry out inverse transformation according to the sign decision of reading, and carry out corresponding operating;
(7) TU is combined as PU, carries out addition with the predicted value of the current PU that obtains that passes through motion compensation, obtains the reconstruction value of PU, and then rebuilds present encoding unit CU.
Because this method gives the extra selection that one of converter unit is skipped shift step; Each converter unit is according to the traditional transition coding of the minimum adaptive selection of principle of rate distortion costs or skip conversion and directly quantize, so this coding method of video sequence compression effectiveness to HEVC is good, complexity is low, be suitable for practical application.
Description of drawings
Fig. 1 shows the flow chart of the coding method of video sequence that is directed against HEVC of prior art.
Embodiment
This coding method of video sequence to HEVC may further comprise the steps:
(1) for the luminance component among the predicting unit PU, obtain its predict blocks, and then subtract each other with original value and to obtain residual error, carry out division based on rate distortion costs, obtain converter unit TU;
(2) confirm that current TU selects whether to carry out conversion according to the minimum principle of rate distortion costs;
(3) select after, quantize with corresponding method, and quantization parameter is reached the sign that whether carries out conversion reach decoding end;
(4) in decoding end, each TU reads sign and judges whether to carry out inverse transformation;
(5) each TU carries out corresponding inverse quantization according to the sign of reading;
(6) whether carry out inverse transformation according to the sign decision of reading, and carry out corresponding operating;
(7) TU is combined as PU, carries out addition with the predicted value of the current PU that obtains that passes through motion compensation, obtains the reconstruction value of PU, and then rebuilds present encoding unit CU.
Because this method gives the extra selection that one of converter unit is skipped shift step; Each converter unit is according to the traditional transition coding of the minimum adaptive selection of principle of rate distortion costs or skip conversion and directly quantize, so this coding method of video sequence compression effectiveness to HEVC is good, complexity is low, be suitable for practical application.
Preferably, quantification and inverse quantization are following:
UiQ=(uiQ*tsmScale)>> tsmmShift (* is a multiplication,>> displacement to the right, uiQ is a quantization parameter)
Wherein tsmScale, tsmmShift are the adjusting parameters that the TU according to different size is provided with, and when the size of TU was 4 * 4,8 * 8,16 * 16,32 * 32, tsmScale was respectively 128
2, 181
2, 256
2, 362
2
tsmShift＝SHIFT_INV_1ST+SHIFT_INV_2ND
SHIFT_INV_1ST and SHIFT_INV_2ND are made as 7 and 12 respectively.
We can have several kinds of following configurations:
1. high-performance configuration: have 4 * 4,8 * 8, whether the adaptive selection of the converter unit of 16 * 16,32 * 32 sizes skips transition coding;
2. low complex degree configuration: have 4 * 4; Whether the adaptive selection of the converter unit of 8 * 8 sizes skips transition coding, and all the other converter units directly carry out transition coding, and principle is all to concentrate on 4 * 4 according to the unit 96% of skipping transition coding; On the converter unit of 8 * 8 sizes; So we are according to this characteristic, only will skip in step application to 4 * 4 and 8 * 8 of transition coding, can reduce complexity significantly like this.
And we can adjust configuration, and this method is applied to the converter unit of various sizes, form different combinations.
Experimental result shows that our all configurations all can obtain higher compression efficiency.
The above; It only is preferred embodiment of the present invention; Be not that the present invention is done any pro forma restriction, every foundation technical spirit of the present invention all still belongs to the protection range of technical scheme of the present invention to any simple modification, equivalent variations and modification that above embodiment did.
Claims (2)
1. coding method of video sequence to HEVC is characterized in that: may further comprise the steps:
(1) for the luminance component among the predicting unit PU, obtain its predict blocks, and then subtract each other with original value and to obtain residual error, carry out division based on rate distortion costs, obtain converter unit TU;
(2) confirm that current TU selects whether to carry out conversion according to the minimum principle of rate distortion costs;
(3) quantize with corresponding method, and quantization parameter and the sign that whether carries out conversion are reached decoding end;
(4) in decoding end, each TU reads sign and judges whether to carry out inverse transformation;
(5) each TU carries out corresponding inverse quantization according to the sign of reading;
(6) whether carry out inverse transformation according to the sign decision of reading, and carry out corresponding operating;
(7) TU is combined as PU, carries out addition with the predicted value of the current PU that obtains that passes through motion compensation, obtains the reconstruction value of PU, and then rebuilds present encoding unit CU.
2. the coding method of video sequence to HEVC according to claim 1 is characterized in that: quantification and inverse quantization are following:
uiQ＝(uiQ*tsmScale)>>tsmShift
Wherein tsmScale, tsmShift are the adjusting parameters that the TU according to different size is provided with, and when the size of TU was 4 * 4,8 * 8,16 * 16,32 * 32, tsmScale was respectively 128
2, 181
2, 256
2, 362
2
tsmShift＝SHIFT_INV_1ST+SHIFT_INV_2ND
SHIFT_INV_1ST and SHIFT_INV_2ND are made as 7 and 12 respectively.
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