CN103533325A - Depth image intra-frame encoding and decoding methods, devices and encoder and decoder - Google Patents
Depth image intra-frame encoding and decoding methods, devices and encoder and decoder Download PDFInfo
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Abstract
The invention provides depth image intra-frame encoding and decoding methods, devices and an encoder and a decoder. The encoding method is applied to three-dimensional video encoding or multi-view video encoding, and comprises the steps of: judging whether to adopt an intra-frame skipping encoding mode when carrying out intra-frame encoding on a prediction unit of a depth image; setting the residual error data of the prediction unit to zero if determining to adopt the intra-frame skipping encoding mode, and not carrying out encoding on the residual error data. The decoding method is applied to three-dimensional video decoding or multi-view video decoding, and comprises the steps of: judging whether an encoder end adopts the intra-frame skipping encoding mode when carrying out intra-frame decoding on the prediction unit of the depth image; setting the residual error data of the prediction unit to zero if determining that the encoder end adopts the intra-frame skipping encoding mode, and not carrying out decoding on the residual error data. According to the invention, the code rate needed in the process of depth image encoding is lowered; on the basis that the efficiency of encoding and decoding is improved, the structure of the existing image is not damaged; and the realization of hardware is facilitated.
Description
Technical field
The present invention relates to video coding and decoding technology field, relate in particular to decoding method, device and codec in a kind of depth map picture frame.
Background technology
In 3 d video encoding or various visual angles application, depth image can be used to provide visual angle more flexibly.Depth information is different from texture information, and it is not used for directly showing, but first converts parallax information (disparity vector) to, is then used from and generates synthetic viewpoint with texture information one.
Generate in the process of synthetic viewpoint, the distortion of depth block is very little to the distortion effect of synthetic viewpoint in following two kinds of situations: 1. the distortion of depth value does not cause the distortion of parallax information, and the texture value near zone that 2. current depth value is corresponding is very level and smooth.
As fully visible, in above two kinds of situations, the residual error of coding or depth of decode piece need to take code check but can not bring the raising of synthesizing viewpoint quality.
Summary of the invention
The embodiment of the present invention provides decoding method, device and codec in a kind of depth map picture frame, to reduce coding or the required code check of depth of decode image, improves coding efficiency.
On the one hand, the embodiment of the present invention provides a kind of depth image inner frame coding method, and described depth image inner frame coding method is applied in 3 d video encoding or multi-view video coding, and described depth image inner frame coding method comprises:
When the predicting unit of a depth image is carried out to intraframe coding, judge whether to adopt and in frame, skip coding mode;
If determine, adopt in frame and skip coding mode, the residual error data of described predicting unit is set to zero, this residual error data is not encoded.
Preferably, in an embodiment of the present invention, it is described when the predicting unit of a depth image is carried out to intraframe coding, judge whether to adopt and in frame, skip coding mode, comprise: when the predicting unit of a depth image is carried out to intraframe coding, according to skipping coding maker position in a coded frame, judge whether to adopt and in frame, skip coding mode.
Preferably, in an embodiment of the present invention, if skip coding mode in described definite employing frame, the residual error data of described predicting unit is set to zero, this residual error data is not encoded, comprising: if determine, adopt in frame and skip coding mode, described predicting unit adopts Forecasting Methodology generation forecast value corresponding to intra-frame encoding mode in 35 kinds of high-performance video coding standard HEVC, and the residual error data of described predicting unit is set to zero, this residual error data is not encoded.
Preferably, in an embodiment of the present invention, if skip coding mode in described definite employing frame, the residual error data of described predicting unit is set to zero, this residual error data is not encoded, comprising: if skip coding mode in described definite employing frame, described predicting unit adopts a predictive mode generation forecast value of the rate distortion costs minimum in 3 kinds of most probable patterns in HEVC, and the residual error data of described predicting unit is set to zero, this residual error data is not encoded.
Preferably, in an embodiment of the present invention, described depth image inner frame coding method also comprises: the described predicting unit index value of encoding indicates this predicting unit to adopt which the predictive mode generation forecast value in 3 kinds of most probable patterns in described HEVC.
Preferably, in an embodiment of the present invention, described residual error data comprises: residual error coefficient and be respectively used to the brightness of indication predicting unit, and colourity, whether saturation residual error coefficient is 3 flag bits of zero entirely; When the dividing mode of intraframe coding unit is 2Nx2N, this coding unit inside only has a predicting unit, if this predicting unit adopts in frame and skips pattern-coding, the residual error data of whole coding unit inside is all zero, now, no longer need the information of converter unit, described residual error data also further comprises: be used to indicate the flag bit whether converter unit needs Further Division, wherein, N=2
k, k is more than or equal to 2 integer.
On the other hand, the embodiment of the present invention provides a kind of depth image intraframe decoder method, and described depth image intraframe decoder method is applied in 3 D video decoding or multi-angle video decoding, and described depth image intraframe decoder method comprises:
When the predicting unit of a depth image is carried out to intraframe decoder, judge whether encoder-side adopts in frame, to skip coding mode;
If determine, encoder-side adopts in frame skips coding mode, the residual error data of described predicting unit is set to zero, this residual error data is not decoded.
Preferably, in an embodiment of the present invention, it is described when the predicting unit of a depth image is carried out to intraframe decoder, judging whether encoder-side adopts skips coding mode in frame, comprise: when the predicting unit of a depth image is carried out to intraframe decoder, according to skipping coding maker position in a decoded frame, judge whether encoder-side adopts and in frame, skip coding mode.
Preferably, in an embodiment of the present invention, if adopting in frame, described definite encoder-side skips coding mode, the residual error data of described predicting unit is set to zero, this residual error data is not decoded, comprising: encoder-side adopts in frame if determine skips coding mode, and described predicting unit adopts Forecasting Methodology generation forecast value corresponding to intra-frame encoding mode in 35 kinds of HEVC, and the residual error data of described predicting unit is set to zero, this residual error data is not decoded.
Preferably, in an embodiment of the present invention, if adopting in frame, described definite encoder-side skips coding mode, the residual error data of described predicting unit is set to zero, this residual error data is not decoded, comprising: if encoder-side is determined to adopt in frame, skip coding mode, described predicting unit adopts a predictive mode generation forecast value of the rate distortion costs minimum in 3 kinds of most probable patterns in HEVC, and the residual error data of described predicting unit is set to zero, this residual error data is not decoded.
Preferably, in an embodiment of the present invention, if determining to adopt in frame, described encoder-side skips coding mode, described predicting unit adopts a predictive mode generation forecast value of the rate distortion costs minimum in 3 kinds of most probable patterns in HEVC, and the residual error data of described predicting unit is set to zero, this residual error data is not decoded, comprise: if encoder-side is determined to adopt in frame, skip coding mode, described predicting unit is determined and is adopted which the predictive mode generation forecast value in 3 kinds of most probable patterns in HEVC according to an index value, and the residual error data of described predicting unit is set to zero, this residual error data is not decoded.
Preferably, in an embodiment of the present invention, described residual error data comprises: residual error coefficient and be respectively used to the brightness of indication predicting unit, and colourity, whether saturation residual error coefficient is 3 flag bits of zero entirely; When the dividing mode of intraframe coding unit is 2Nx2N, this coding unit inside only has a predicting unit, if this predicting unit adopts in frame and skips pattern-coding, the residual error data of whole coding unit inside is all zero, now, no longer need the information of converter unit, described residual error data also further comprises: be used to indicate the flag bit whether converter unit needs Further Division, wherein, N=2
k, k is more than or equal to 2 integer.
Another aspect, the embodiment of the present invention provides a kind of depth image intraframe coding device, and described depth image inner frame coding method is applied in 3 d video encoding or multi-view video coding, and described depth image intraframe coding device comprises:
Coding judging unit, for when the predicting unit of a depth image is carried out to intraframe coding, judges whether to adopt and in frame, skips coding mode;
Coding processing unit, if skip coding mode for determining to adopt in frame, is set to the residual error data of described predicting unit zero, this residual error data is not encoded.
Preferably, in an embodiment of the present invention, described coding judging unit, while being further used for the predicting unit of a depth image to carry out intraframe coding, judging whether to adopt and in frame, skips coding mode according to skipping coding maker position in a coded frame.
Preferably, in an embodiment of the present invention, described coding processing unit comprises: the first coding processing module, if skip coding mode for determining to adopt in frame, described predicting unit adopts Forecasting Methodology generation forecast value corresponding to intra-frame encoding mode in 35 kinds of high-performance video coding standard HEVC, and the residual error data of described predicting unit is set to zero, this residual error data is not encoded.
Preferably, in an embodiment of the present invention, described coding processing unit comprises: the second coding processing module, if skip coding mode in described definite employing frame, described predicting unit adopts a predictive mode generation forecast value of the rate distortion costs minimum in 3 kinds of most probable patterns in HEVC, and the residual error data of described predicting unit is set to zero, this residual error data is not encoded.
Preferably, in an embodiment of the present invention, described coding processing unit also comprises: code index module, and for the described predicting unit index value of encoding, indicate this predicting unit to adopt which the predictive mode generation forecast value in 3 kinds of most probable patterns of described HEVC.
Preferably, in an embodiment of the present invention, described residual error data comprises: residual error coefficient and be respectively used to the brightness of indication predicting unit, and colourity, whether saturation residual error coefficient is 3 flag bits of zero entirely; When the dividing mode of intraframe coding unit is 2Nx2N, this coding unit inside only has a predicting unit, if this predicting unit adopts in frame and skips pattern-coding, the residual error data of whole coding unit inside is all zero, now, no longer need the information of converter unit, described residual error data also further comprises: be used to indicate the flag bit whether converter unit needs Further Division, wherein, N=2
k, k is more than or equal to 2 integer.
Another aspect, the embodiment of the present invention provides a kind of depth image intraframe decoder device, and described depth image intraframe decoder method is applied in 3 D video decoding or multi-angle video decoding, and described depth image intraframe decoder device comprises:
Decoding judging unit, for when the predicting unit of a depth image is carried out to intraframe decoder, judges whether encoder-side adopts in frame, to skip coding mode;
Codec processing unit, if skip coding mode for determining that encoder-side adopts in frame, is set to the residual error data of described predicting unit zero, this residual error data is not decoded.
Preferably, in an embodiment of the present invention, described decoding judging unit, while being further used for the predicting unit of a depth image to carry out intraframe decoder, judging whether encoder-side adopts and in frame, skips coding mode according to skipping coding maker position in a decoded frame.
Preferably, in an embodiment of the present invention, described codec processing unit comprises: the first decoding process module, if skip coding mode for determining that encoder-side adopts in frame, described predicting unit adopts Forecasting Methodology generation forecast value corresponding to intra-frame encoding mode in 35 kinds of HEVC, and the residual error data of described predicting unit is set to zero, this residual error data is not decoded.
Preferably, in an embodiment of the present invention, described codec processing unit comprises: the second decoding process module, if determine to adopt in frame for encoder-side and skip coding mode, described predicting unit adopts a predictive mode generation forecast value of the rate distortion costs minimum in 3 kinds of most probable patterns in HEVC, and the residual error data of described predicting unit is set to zero, this residual error data is not decoded.
Preferably, in an embodiment of the present invention, described the second decoding process module, if be further used for definite the employing in frame of encoder-side, skip coding mode, described predicting unit is determined and is adopted which the predictive mode generation forecast value in 3 kinds of most probable patterns in HEVC according to an index value, and the residual error data of described predicting unit is set to zero, this residual error data is not decoded.
Preferably, in an embodiment of the present invention, described residual error data comprises: residual error coefficient and be respectively used to the brightness of indication predicting unit, and colourity, whether saturation residual error coefficient is 3 flag bits of zero entirely; When the dividing mode of intraframe coding unit is 2Nx2N, this coding unit inside only has a predicting unit, if this predicting unit adopts in frame and skips pattern-coding, the residual error data of whole coding unit inside is all zero, now, no longer need the information of converter unit, described residual error data also further comprises: be used to indicate the flag bit whether converter unit needs Further Division, wherein, N=2
k, k is more than or equal to 2 integer.
Another aspect, the embodiment of the present invention provides a kind of encoder, and described encoder applies is in 3 d video encoding or multi-view video coding, and described encoder comprises above-mentioned depth image intraframe coding device.
On the one hand, the embodiment of the present invention provides a kind of decoder again, and described decoder application is in 3 d video encoding or multi-angle video decoding, and described decoder comprises above-mentioned depth image intraframe decoder device.
Technique scheme has following beneficial effect: because adopt the method be applied in 3 D video encoding and decoding or multi-angle video encoding and decoding to comprise: when the predicting unit of a depth image being carried out in frame encoding and decoding, judge whether encoder-side adopts in frame, to skip coding mode; If determine, adopt in frame and skip coding mode, the residual error data of described predicting unit is set to zero, this residual error data is not carried out the technological means of encoding and decoding, so reduced the required code check of encoding and decoding depth image, improved coding efficiency, improve video compression coding-decoding efficiency, and on the basis of improving encoding-decoding efficiency, do not destroyed the structure of conventional images unit, be conducive to the realization of hardware.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is a kind of depth image inner frame coding method of embodiment of the present invention flow chart;
Fig. 2 is a kind of depth image intraframe coding of embodiment of the present invention apparatus structure schematic diagram;
Fig. 3 is embodiment of the present invention coding processing unit structural representation;
Fig. 4 is a kind of depth image intraframe decoder of embodiment of the present invention method flow diagram;
Fig. 5 is a kind of depth image intraframe decoder of embodiment of the present invention apparatus structure schematic diagram;
Fig. 6 is embodiment of the present invention codec processing unit structural representation;
Fig. 7 is 3 kinds of most probable intra prediction mode coding schematic flow sheets of application example of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
The problem existing in order to solve prior art, this embodiment of the present invention proposes: in depth image intra-frame encoding mode, introduce in frame and skip coding mode, the residual error of coding depth image not in this pattern.
As shown in Figure 1, be a kind of depth image inner frame coding method of embodiment of the present invention flow chart, described depth image inner frame coding method is applied in 3 d video encoding or multi-view video coding, and described depth image inner frame coding method comprises:
101,, when the predicting unit of a depth image is carried out to intraframe coding, judge whether to adopt and in frame, skip coding mode;
If 102 definite employings in frame are skipped coding mode, the residual error data of described predicting unit is set to zero, this residual error data is not encoded.
Preferably, it is described when the predicting unit of a depth image is carried out to intraframe coding, judge whether to adopt and in frame, skip coding mode, comprise: when the predicting unit of a depth image is carried out to intraframe coding, according to skipping coding maker position in a coded frame, judge whether to adopt and in frame, skip coding mode.
Preferably, if skip coding mode in described definite employing frame, the residual error data of described predicting unit is set to zero, this residual error data is not encoded, comprise: if determine, adopt in frame and skip coding mode, described predicting unit adopts Forecasting Methodology generation forecast value corresponding to intra-frame encoding mode in 35 kinds of high-performance video coding standard HEVC, and the residual error data of described predicting unit is set to zero, this residual error data is not encoded.
Preferably, if skip coding mode in described definite employing frame, the residual error data of described predicting unit is set to zero, this residual error data is not encoded, comprise: if skip coding mode in described definite employing frame, described predicting unit adopts a predictive mode generation forecast value of the rate distortion costs minimum in 3 kinds of most probable patterns in HEVC, and the residual error data of described predicting unit is set to zero, this residual error data is not encoded.
Preferably, described depth image inner frame coding method also comprises: the described predicting unit index value of encoding indicates this predicting unit to adopt which the predictive mode generation forecast value in 3 kinds of most probable patterns in described HEVC.
Preferably, described residual error data comprises: residual error coefficient and be respectively used to the brightness of indication predicting unit, and colourity, whether saturation residual error coefficient is 3 flag bits of zero entirely; When the dividing mode of intraframe coding unit is 2Nx2N, this coding unit inside only has a predicting unit, if this predicting unit adopts in frame and skips pattern-coding, the residual error data of whole coding unit inside is all zero, now, no longer need the information of converter unit, described residual error data also further comprises: be used to indicate the flag bit whether converter unit needs Further Division, wherein, N=2
k, k is more than or equal to 2 integer.
Corresponding to said method embodiment, as shown in Figure 2, for a kind of depth image intraframe coding of embodiment of the present invention apparatus structure schematic diagram, described depth image inner frame coding method is applied in 3 d video encoding or multi-view video coding, and described depth image intraframe coding device comprises:
Preferably, described coding judging unit 21, while being further used for the predicting unit of a depth image to carry out intraframe coding, judging whether to adopt and in frame, skips coding mode according to skipping coding maker position in a coded frame.
Preferably, as shown in Figure 3, for embodiment of the present invention coding processing unit structural representation, described coding processing unit 22 comprises: the first coding processing module 221, if skip coding mode for determining to adopt in frame, described predicting unit adopts Forecasting Methodology generation forecast value corresponding to intra-frame encoding mode in 35 kinds of high-performance video coding standard HEVC, and the residual error data of described predicting unit is set to zero, this residual error data is not encoded.Preferably, described coding processing unit 22 comprises: the second coding processing module 222, if skip coding mode in described definite employing frame, described predicting unit adopts a predictive mode generation forecast value of the rate distortion costs minimum in 3 kinds of most probable patterns in HEVC, and the residual error data of described predicting unit is set to zero, this residual error data is not encoded.Preferably, described coding processing unit 22 also comprises: code index module 223, and for the described predicting unit index value of encoding, indicate this predicting unit to adopt which the predictive mode generation forecast value in 3 kinds of most probable patterns of described HEVC.
Preferably, described residual error data comprises: residual error coefficient and be respectively used to the brightness of indication predicting unit, and colourity, whether saturation residual error coefficient is 3 flag bits of zero entirely; When the dividing mode of intraframe coding unit is 2Nx2N, this coding unit inside only has a predicting unit, if this predicting unit adopts in frame and skips pattern-coding, the residual error data of whole coding unit inside is all zero, now, no longer need the information of converter unit, described residual error data also further comprises: be used to indicate the flag bit whether converter unit needs Further Division, wherein, N=2
k, k is more than or equal to 2 integer.
Embodiment of the present invention said method and device technique scheme have following beneficial effect: because adopt the method be applied in 3 d video encoding or multi-view video coding to comprise: when the predicting unit of a depth image is carried out to intraframe coding, judge whether encoder-side adopts in frame, to skip coding mode; If determine, adopt in frame and skip coding mode, the residual error data of described predicting unit is set to zero, the technological means of this residual error data not being encoded, so reduced the required code check of coding depth image, improved coding efficiency, improve video compression coding efficiency, and on the basis of improving code efficiency, do not destroyed the structure of conventional images unit, be conducive to the realization of hardware.
As shown in Figure 4, be a kind of depth image intraframe decoder of embodiment of the present invention method flow diagram, described depth image intraframe decoder method is applied in 3 D video decoding or multi-angle video decoding, and described depth image intraframe decoder method comprises:
401,, when the predicting unit of a depth image is carried out to intraframe decoder, judge whether encoder-side adopts in frame, to skip coding mode;
If 402 definite encoder-side adopt in frame, skip coding mode, the residual error data of described predicting unit is set to zero, this residual error data is not decoded.
Preferably, it is described when the predicting unit of a depth image is carried out to intraframe decoder, judging whether encoder-side adopts skips coding mode in frame, comprise: when the predicting unit of a depth image is carried out to intraframe decoder, according to skipping coding maker position in a decoded frame, judge whether encoder-side adopts and in frame, skip coding mode.
Preferably, if adopting in frame, described definite encoder-side skips coding mode, the residual error data of described predicting unit is set to zero, this residual error data is not decoded, comprise: if determine, encoder-side adopts in frame skips coding mode, described predicting unit adopts Forecasting Methodology generation forecast value corresponding to intra-frame encoding mode in 35 kinds of HEVC, and the residual error data of described predicting unit is set to zero, this residual error data is not decoded.
Preferably, if adopting in frame, described definite encoder-side skips coding mode, the residual error data of described predicting unit is set to zero, this residual error data is not decoded, comprise: if encoder-side is determined to adopt in frame, skip coding mode, described predicting unit adopts a predictive mode generation forecast value of the rate distortion costs minimum in 3 kinds of most probable patterns in HEVC, and the residual error data of described predicting unit is set to zero, this residual error data is not decoded.
Preferably, if determining to adopt in frame, described encoder-side skips coding mode, described predicting unit adopts a predictive mode generation forecast value of the rate distortion costs minimum in 3 kinds of most probable patterns in HEVC, and the residual error data of described predicting unit is set to zero, this residual error data is not decoded, comprise: if encoder-side is determined to adopt in frame, skip coding mode, described predicting unit is determined and is adopted which the predictive mode generation forecast value in 3 kinds of most probable patterns in HEVC according to an index value, and the residual error data of described predicting unit is set to zero, this residual error data is not decoded.
Preferably, described residual error data comprises: residual error coefficient and be respectively used to the brightness of indication predicting unit, and colourity, whether saturation residual error coefficient is 3 flag bits of zero entirely; When the dividing mode of intraframe coding unit is 2Nx2N, this coding unit inside only has a predicting unit, if this predicting unit adopts in frame and skips pattern-coding, the residual error data of whole coding unit inside is all zero, now, no longer need the information of converter unit, described residual error data also further comprises: be used to indicate the flag bit whether converter unit needs Further Division, wherein, N=2
k, k is more than or equal to 2 integer.
Corresponding to said method embodiment, as shown in Figure 5, for a kind of depth image intraframe decoder of embodiment of the present invention apparatus structure schematic diagram, described depth image intraframe decoder method is applied in 3 D video decoding or multi-angle video decoding, and described depth image intraframe decoder device comprises:
Decoding judging unit 51, for when the predicting unit of a depth image is carried out to intraframe decoder, judges whether encoder-side adopts in frame, to skip coding mode;
Preferably, described decoding judging unit 51, while being further used for the predicting unit of a depth image to carry out intraframe decoder, judging whether encoder-side adopts and in frame, skips coding mode according to skipping coding maker position in a decoded frame.
Preferably, as shown in Figure 6, for embodiment of the present invention codec processing unit structural representation, described codec processing unit 52 comprises: the first decoding process module 521, if skip coding mode for determining that encoder-side adopts in frame, described predicting unit adopts Forecasting Methodology generation forecast value corresponding to intra-frame encoding mode in 35 kinds of HEVC, and the residual error data of described predicting unit is set to zero, this residual error data is not decoded.Preferably, described codec processing unit 52 comprises: the second decoding process module 522, if determine to adopt in frame for encoder-side and skip coding mode, described predicting unit adopts a predictive mode generation forecast value of the rate distortion costs minimum in 3 kinds of most probable patterns in HEVC, and the residual error data of described predicting unit is set to zero, this residual error data is not decoded.Preferably, described the second decoding process module 522, if be further used for definite the employing in frame of encoder-side, skip coding mode, described predicting unit is determined and is adopted which the predictive mode generation forecast value in 3 kinds of most probable patterns in HEVC according to an index value, and the residual error data of described predicting unit is set to zero, this residual error data is not decoded.
Preferably, residual error coefficient and be respectively used to the brightness of indication predicting unit, colourity, whether saturation residual error coefficient is 3 flag bits of zero entirely; When the dividing mode of intraframe coding unit is 2Nx2N, this coding unit inside only has a predicting unit, if this predicting unit adopts in frame and skips pattern-coding, the residual error data of whole coding unit inside is all zero, now, no longer need the information of converter unit, described residual error data also further comprises: be used to indicate the flag bit whether converter unit needs Further Division, wherein, N=2
k, k is more than or equal to 2 integer.
Embodiment of the present invention said method or device technique scheme have following beneficial effect: because adopt the method be applied in 3 D video decoding or multi-angle video decoding to comprise: when the predicting unit of a depth image is carried out to intraframe decoder, judge whether encoder-side adopts in frame, to skip coding mode; If determine, adopt in frame and skip coding mode, the residual error data of described predicting unit is set to zero, the technological means of this residual error data not being decoded, so reduced the required code check of decoding depth image, improved video compression decode efficiency, and improving the structure of not destroying conventional images unit on the basis of decoding efficiency, be conducive to the realization of hardware.
Application example of the present invention provides a kind of encoder, and described encoder applies is in 3 d video encoding or multi-view video coding, and described encoder comprises above-mentioned depth image intraframe coding device.Application example of the present invention also provides a kind of decoder, and described decoder is also applied in 3 d video encoding or multi-angle video decoding, and described decoder comprises above-mentioned depth image intraframe decoder device.Below in conjunction with application example, technical solution of the present invention is described below:
Encoder:
When the predicting unit of a depth image (prediction unit) is carried out to intraframe coding, can adopt traditional intraframe coding method, also can adopt and in frame, skip coding (intra skip coding) pattern.Encoder needs to skip in a coded frame coding maker position and distinguishes to adopt in traditional intra-frame encoding mode or frame and skip coding mode.
In frame, skip in coding mode, the predicted value of predicting unit adopts Forecasting Methodology corresponding to intra-frame encoding mode in 35 kinds of traditional HEVC to obtain, but the residual error of predicting unit is directly set to zero, and residual error data is no longer encoded.
Decoder:
To a depth image predicting unit that adopts intra-frame encoding mode coding, decoder needs to skip in a decoded frame that coding maker position distinguishes that encoder-side adopts is to skip coding mode in traditional intra-frame encoding mode or frame.
If skip coding mode in employing frame, the predicted value of predicting unit adopts Forecasting Methodology corresponding to intra-frame encoding mode in 35 kinds of traditional HEVC to obtain, but the residual error of predicting unit does not need decoding, is not directly set to zero.
In frame, skip coding mode and adopt conventional method generation forecast value, but not coded residual information and coded prediction pattern information only.
In current 3DV-HEVC (3dimensional video coding – high efficiency video coding) coding, depth image can have at most 43 kinds of intra prediction modes, comprise 35 kinds of intra-frame encoding modes in HEVC, and 8 kinds of coding modes for depth image characteristics design.
In the frame proposing, skip in coding mode, predicting unit can adopt 35 kinds of Forecasting Methodology generation forecast values that the intra-frame encoding mode in HEVC is corresponding, but its residual error is all set to zero.The residual information of predicting unit does not need coding and only needs coded prediction pattern information, thereby saves code check.In order further to reduce the code check of skip mode in frame, predicting unit only allows to use 3 kinds of most probable patterns (most probable mode) of stipulating in HEVC intraframe coding rather than all 35 kinds of frame modes as candidate's predictive mode, and the encode predictive mode of present encoding unit of employing and the identical mode of most probable predictive mode of encoding in HEVC.
As shown in Figure 7, be 3 kinds of most probable intra prediction mode coding schematic flow sheets of application example of the present invention, detail is as follows:
701, obtain 3 kinds of most probable intra prediction modes of current predicting unit;
702, by i=0;
703, judge whether 3 kinds of predictive modes are completed, and in this way, go to step 707, otherwise, go to step 704;
704, with i kind most probable intra prediction mode, current predicting unit is predicted, residual error is set to zero, coding;
705, calculate rate distortion costs corresponding to i kind most probable intra prediction mode;
706,, by i=i+1, then go to step 703;
707, select 3 kinds of optimal prediction modes (i.e. a predictive mode of the rate distortion costs minimum in 3 kinds of most probable patterns) in most probable predictive mode;
708, finish.
Predicting unit coding:
In existing 3DV-HEVC coding, during coded frame inner estimation mode, the flag bit (being designated as flag1) of need to encoding is distinguished and has been used 35 kinds of coding modes or the new 8 kinds of coding modes for depth image that propose in HEVC.For skip mode in coded frame, when flag1 is true time, application example of the present invention has been introduced a new flag bit (being designated as flag2) and has been distinguished and adopted in 3DV-HEVC for skipping coding mode in 8 kinds of coding modes of depth image or frame.If current predicting unit has adopted in frame and skipped coding mode, the index value that also needs to encode indicates it to use which predictive mode in 3 kinds of most probable predictive modes.
Predicting unit syntactic element is amended as follows shown in table 1, revises part and carries out overstriking demonstration:
Wherein, use DIS flag: whether this variable uses while being used for presentation code current video is skipped coding mode in frame.If skip coding mode in use frame, use_DIS_flag is true, otherwise use_DIS_flag is false.
Log2MinDISSize:(1 < < log2MinDISSize) definition can be used height and the width of the minimum predicting unit of skipping coding mode in frame.
Pred_dir_larger_than_35_flag: this variable is used for representing whether the coding mode of predicting unit is greater than 35.If current predicting unit adopts 35 kinds of coding modes in HEVC, pred_dir_larger_than_35_flag is false; Otherwise pred_dir_larger_than_35_flag is true.
Pred_dir_larger_than_43_flag: whether this variable is used for representing to adopt skips coding mode in frame.If current predicting unit adopts in frame and skips coding mode, variable pred_dir_larger_than_43_flag is true; Otherwise pred_dir_larger_than_43_flag is false.
Mpm_idx[x0] [y0]: in frame, skipping in coding mode, only allow to use 3 kinds of most probable coding modes in HEVC as candidate pattern, mpm_idx[x0] which in these 3 kinds of patterns [y0] represent to have used.
Table 1 predicting unit syntactic element is revised
Converter unit coding:
In frame, in skip mode, do not need coded residual information, therefore do not need coded residual coefficient, do not need coding to be respectively used to the brightness of indication predicting unit simultaneously yet, colourity, whether saturation residual error coefficient is 3 zero flag bits entirely.(wherein, N=2 when the dividing mode of intraframe coding unit is 2Nx2N
k, k is more than or equal to 2 integer), its inside only has a predicting unit, if this predicting unit adopts in frame, skips pattern-coding, and the residual error of whole coding unit inside is all zero.Now, no longer need the information of converter unit, so in converter unit, be used to indicate also coding no longer of flag bit that whether converter unit need Further Division.
Converter unit syntactic element is amended as follows shown in table 2: revise part and carry out overstriking demonstration:
Table 2 converter unit syntactic element is revised
Wherein:
PredMode: the coding mode of Current Transform unit.If it equals MODE_INTRA, represent that Current Transform unit adopts intra-frame encoding mode:
IntraPredMode: the predictive mode that represents Current Transform unit.IntraPredMode[x0] [y0] > 43 represent that Current Transform unit have adopted and in frame, skip coding mode.
PartMode: the partition mode that represents the coding unit at place, Current Transform unit.PartMode==PART_2Nx2N represents that the coding unit at place, Current Transform unit does not have Further Division (namely only including a predicting unit).
Application example experimental result of the present invention: the method that application example of the present invention proposes has been integrated into 3DV-HTM(threedimensional video coding – High Efficiency Video Coding (HEVC) based test model, 3 d video encoding test model based on high-performance video coding standard) in 3.0, and compare with it.Although the method has been integrated into (the high efficiency video coding based on HEVC, high-performance video coding standard) in 3D encoding software, but the method also can be for based on AVC(advanced video coding, advanced video coding) in 3D coding, simultaneously can also be for the multi-view video coding based on HEVC or AVC.Cycle tests has adopted the balloons that resolution is 1024x768, kendo and (after colour correction) newspaper.
Experimental result is as shown in table 3 below, can find out, " synthetic viewpoint " code check reaches 0.2% to the method for proposition can reduce, and reduces " coded views and synthetic viewpoint " code check and reaches 0.4%.Because put forward the methods does not change the coded system of texture image, the code check of coded views does not change.
Table 3 experimental result
Application example technical scheme of the present invention has improved video compression coding-decoding efficiency, and on the basis of improving encoding-decoding efficiency, does not destroy the structure of conventional images unit, is conducive to the realization of hardware.
Those skilled in the art can also recognize the various illustrative components, blocks (illustrative logical block) that the embodiment of the present invention is listed, unit, and step can pass through electronic hardware, computer software, or both combinations realize.For the clear replaceability (interchangeability) of showing hardware and software, above-mentioned various illustrative components (illustrative components), unit and step have been described their function generally.Such function is to realize by hardware or software the designing requirement of depending on specific application and whole system.Those skilled in the art can, for every kind of specific application, can make in all sorts of ways and realize described function, but this realization should not be understood to exceed the scope of embodiment of the present invention protection.
Various illustrative logical block described in the embodiment of the present invention, or unit can pass through general processor, digital signal processor, application-specific integrated circuit (ASIC) (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or the design of above-mentioned any combination realizes or operates described function.General processor can be microprocessor, and alternatively, this general processor can be also any traditional processor, controller, microcontroller or state machine.Processor also can be realized by the combination of calculation element, for example digital signal processor and microprocessor, multi-microprocessor, a Digital Signal Processor Core of one or more microprocessors associating, or any other similarly configuration realize.
Method described in the embodiment of the present invention or the step of algorithm can directly embed hardware, the software module of processor execution or the two combination.Software module can be stored in the storage medium of other arbitrary form in RAM memory, flash memory, ROM memory, eprom memory, eeprom memory, register, hard disk, moveable magnetic disc, CD-ROM or this area.Exemplarily, storage medium can be connected with processor so that processor can be from storage medium reading information, and can deposit write information to storage medium.Alternatively, storage medium can also be integrated in processor.Processor and storage medium can be arranged in ASIC, and ASIC can be arranged in user terminal.Alternatively, processor and storage medium also can be arranged in the different parts in user terminal.
In one or more exemplary designs, the described above-mentioned functions of the embodiment of the present invention can realize in hardware, software, firmware or this three's combination in any.If realized in software, these functions can be stored on the medium with computer-readable, or are transmitted on the medium of computer-readable with one or more instructions or code form.Computer-readable medium comprises computer storage medium and is convenient to make to allow computer program transfer to other local communication medium from a place.Storage medium can be the useable medium that any general or special computer can access.For example, such computer readable media can include but not limited to RAM, ROM, EEPROM, CD-ROM or other optical disc storage, disk storage or other magnetic storage device, or other anyly can be read by general or special computer or general or special processor the medium of the program code of form with instruction or data structure and other for carrying or storage.In addition, any connection can be suitably defined as computer-readable medium, for example,, if software is by a coaxial cable, fiber optic cables, twisted-pair feeder, Digital Subscriber Line (DSL) or being also comprised in defined computer-readable medium with wireless way for transmittings such as infrared, wireless and microwave from a web-site, server or other remote resource.Described video disc (disk) and disk (disc) comprise Zip disk, radium-shine dish, CD, DVD, floppy disk and Blu-ray Disc, and disk is conventionally with magnetic duplication data, and video disc carries out optical reproduction data with laser conventionally.Above-mentioned combination also can be included in computer-readable medium.
Above-described embodiment; object of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only the specific embodiment of the present invention; the protection range being not intended to limit the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (26)
1. a depth image inner frame coding method, is characterized in that, described depth image inner frame coding method is applied in 3 d video encoding or multi-view video coding, and described depth image inner frame coding method comprises:
When the predicting unit of a depth image is carried out to intraframe coding, judge whether to adopt and in frame, skip coding mode;
If determine, adopt in frame and skip coding mode, the residual error data of described predicting unit is set to zero, this residual error data is not encoded.
2. depth image inner frame coding method as claimed in claim 1, is characterized in that, described when the predicting unit of a depth image is carried out to intraframe coding, judges whether to adopt in frame and skips coding mode, comprising:
When the predicting unit of a depth image is carried out to intraframe coding, according to skipping coding maker position in a coded frame, judge whether to adopt and in frame, skip coding mode.
3. depth image inner frame coding method as claimed in claim 1, is characterized in that, if skip coding mode in described definite employing frame, the residual error data of described predicting unit is set to zero, this residual error data is not encoded, and comprising:
If determine, adopt in frame and skip coding mode, described predicting unit adopts Forecasting Methodology generation forecast value corresponding to intra-frame encoding mode in 35 kinds of high-performance video coding standard HEVC, and the residual error data of described predicting unit is set to zero, this residual error data is not encoded.
4. depth image inner frame coding method as claimed in claim 1, is characterized in that, if skip coding mode in described definite employing frame, the residual error data of described predicting unit is set to zero, this residual error data is not encoded, and comprising:
If skip coding mode in described definite employing frame, described predicting unit adopts a predictive mode generation forecast value of the rate distortion costs minimum in 3 kinds of most probable patterns in HEVC, and the residual error data of described predicting unit is set to zero, this residual error data is not encoded.
5. depth image inner frame coding method as claimed in claim 4, is characterized in that, described depth image inner frame coding method also comprises:
The described predicting unit index value of encoding indicates this predicting unit to adopt which the predictive mode generation forecast value in 3 kinds of most probable patterns in described HEVC.
6. depth image inner frame coding method as described in any one in claim 1-5, is characterized in that, described residual error data comprises: residual error coefficient and be respectively used to the brightness of indication predicting unit, and colourity, whether saturation residual error coefficient is 3 flag bits of zero entirely; When the dividing mode of intraframe coding unit is 2Nx2N, this coding unit inside only has a predicting unit, if this predicting unit adopts in frame and skips pattern-coding, the residual error data of whole coding unit inside is all zero, now, no longer need the information of converter unit, described residual error data also further comprises: be used to indicate the flag bit whether converter unit needs Further Division, wherein, N=2
k, k is more than or equal to 2 integer.
7. a depth image intraframe decoder method, is characterized in that, described depth image intraframe decoder method is applied in 3 D video decoding or multi-angle video decoding, and described depth image intraframe decoder method comprises:
When the predicting unit of a depth image is carried out to intraframe decoder, judge whether encoder-side adopts in frame, to skip coding mode;
If determine, encoder-side adopts in frame skips coding mode, the residual error data of described predicting unit is set to zero, this residual error data is not decoded.
8. depth image intraframe decoder method as claimed in claim 7, is characterized in that, described when the predicting unit of a depth image is carried out to intraframe decoder, judges whether encoder-side adopts in frame to skip coding mode, comprising:
When the predicting unit of a depth image is carried out to intraframe decoder, according to skipping coding maker position in a decoded frame, judge whether encoder-side adopts and in frame, skip coding mode.
9. depth image intraframe decoder method as claimed in claim 7, is characterized in that, if described definite encoder-side adopts in frame, skips coding mode, the residual error data of described predicting unit is set to zero, this residual error data is not decoded, and comprising:
If determine, encoder-side adopts in frame skips coding mode, and described predicting unit adopts Forecasting Methodology generation forecast value corresponding to intra-frame encoding mode in 35 kinds of HEVC, and the residual error data of described predicting unit is set to zero, this residual error data is not decoded.
10. depth image intraframe decoder method as claimed in claim 7, is characterized in that, if described definite encoder-side adopts in frame, skips coding mode, the residual error data of described predicting unit is set to zero, this residual error data is not decoded, and comprising:
If determining to adopt in frame, encoder-side skips coding mode, described predicting unit adopts a predictive mode generation forecast value of the rate distortion costs minimum in 3 kinds of most probable patterns in HEVC, and the residual error data of described predicting unit is set to zero, this residual error data is not decoded.
11. depth image intraframe decoder methods as claimed in claim 10, it is characterized in that, if determining to adopt in frame, described encoder-side skips coding mode, described predicting unit adopts a predictive mode generation forecast value of the rate distortion costs minimum in 3 kinds of most probable patterns in HEVC, and the residual error data of described predicting unit is set to zero, this residual error data is not decoded, comprising:
If determining to adopt in frame, encoder-side skips coding mode, described predicting unit is determined and is adopted which the predictive mode generation forecast value in 3 kinds of most probable patterns in HEVC according to an index value, and the residual error data of described predicting unit is set to zero, this residual error data is not decoded.
12. as described in any one in claim 7-11 depth image intraframe decoder method, it is characterized in that, described residual error data comprises: residual error coefficient and be respectively used to the brightness of indication predicting unit, colourity, whether saturation residual error coefficient is 3 flag bits of zero entirely; When the dividing mode of intraframe coding unit is 2Nx2N, this coding unit inside only has a predicting unit, if this predicting unit adopts in frame and skips pattern-coding, the residual error data of whole coding unit inside is all zero, now, no longer need the information of converter unit, described residual error data also further comprises: be used to indicate the flag bit whether converter unit needs Further Division, wherein, N=2
k, k is more than or equal to 2 integer.
13. 1 kinds of depth image intraframe coding devices, is characterized in that, described depth image inner frame coding method is applied in 3 d video encoding or multi-view video coding, and described depth image intraframe coding device comprises:
Coding judging unit, for when the predicting unit of a depth image is carried out to intraframe coding, judges whether to adopt and in frame, skips coding mode;
Coding processing unit, if skip coding mode for determining to adopt in frame, is set to the residual error data of described predicting unit zero, this residual error data is not encoded.
14. depth image intraframe coding devices as claimed in claim 13, is characterized in that,
Described coding judging unit, while being further used for the predicting unit of a depth image to carry out intraframe coding, judging whether to adopt and in frame, skips coding mode according to skipping coding maker position in a coded frame.
15. depth image intraframe coding devices as claimed in claim 13, is characterized in that, described coding processing unit comprises:
The first coding processing module, if skip coding mode for determining to adopt in frame, described predicting unit adopts Forecasting Methodology generation forecast value corresponding to intra-frame encoding mode in 35 kinds of high-performance video coding standard HEVC, and the residual error data of described predicting unit is set to zero, this residual error data is not encoded.
16. depth image intraframe coding devices as claimed in claim 13, is characterized in that, described coding processing unit comprises:
The second coding processing module, if skip coding mode in described definite employing frame, described predicting unit adopts a predictive mode generation forecast value of the rate distortion costs minimum in 3 kinds of most probable patterns in HEVC, and the residual error data of described predicting unit is set to zero, this residual error data is not encoded.
17. depth image intraframe coding devices as claimed in claim 16, is characterized in that, described coding processing unit also comprises:
Code index module, indicates this predicting unit to adopt which the predictive mode generation forecast value in 3 kinds of most probable patterns of described HEVC for the described predicting unit index value of encoding.
18. as described in any one in claim 13-17 depth image intraframe coding device, it is characterized in that, described residual error data comprises: residual error coefficient and be respectively used to the brightness of indication predicting unit, colourity, whether saturation residual error coefficient is 3 flag bits of zero entirely; When the dividing mode of intraframe coding unit is 2Nx2N, this coding unit inside only has a predicting unit, if this predicting unit adopts in frame and skips pattern-coding, the residual error data of whole coding unit inside is all zero, now, no longer need the information of converter unit, described residual error data also further comprises: be used to indicate the flag bit whether converter unit needs Further Division, wherein, N=2
k, k is more than or equal to 2 integer.
19. 1 kinds of depth image intraframe decoder devices, is characterized in that, described depth image intraframe decoder method is applied in 3 D video decoding or multi-angle video decoding, and described depth image intraframe decoder device comprises:
Decoding judging unit, for when the predicting unit of a depth image is carried out to intraframe decoder, judges whether encoder-side adopts in frame, to skip coding mode;
Codec processing unit, if skip coding mode for determining that encoder-side adopts in frame, is set to the residual error data of described predicting unit zero, this residual error data is not decoded.
20. depth image intraframe decoder devices as claimed in claim 19, is characterized in that,
Described decoding judging unit, while being further used for the predicting unit of a depth image to carry out intraframe decoder, judging whether encoder-side adopts and in frame, skips coding mode according to skipping coding maker position in a decoded frame.
21. depth image intraframe decoder devices as claimed in claim 19, is characterized in that, described codec processing unit comprises:
The first decoding process module, if skip coding mode for determining that encoder-side adopts in frame, described predicting unit adopts Forecasting Methodology generation forecast value corresponding to intra-frame encoding mode in 35 kinds of HEVC, and the residual error data of described predicting unit is set to zero, this residual error data is not decoded.
22. depth image intraframe decoder devices as claimed in claim 19, is characterized in that, described codec processing unit comprises:
The second decoding process module, if determine to adopt in frame for encoder-side and skip coding mode, described predicting unit adopts a predictive mode generation forecast value of the rate distortion costs minimum in 3 kinds of most probable patterns in HEVC, and the residual error data of described predicting unit is set to zero, this residual error data is not decoded.
23. depth image intraframe decoder devices as claimed in claim 22, is characterized in that,
Described the second decoding process module, if be further used for definite the employing in frame of encoder-side, skip coding mode, described predicting unit is determined and is adopted which the predictive mode generation forecast value in 3 kinds of most probable patterns in HEVC according to an index value, and the residual error data of described predicting unit is set to zero, this residual error data is not decoded.
24. as described in any one in claim 19-23 depth image intraframe decoder device, it is characterized in that, described residual error data comprises: residual error coefficient and be respectively used to the brightness of indication predicting unit, colourity, whether saturation residual error coefficient is 3 flag bits of zero entirely; When the dividing mode of intraframe coding unit is 2Nx2N, this coding unit inside only has a predicting unit, if this predicting unit adopts in frame and skips pattern-coding, the residual error data of whole coding unit inside is all zero, now, no longer need the information of converter unit, described residual error data also further comprises: be used to indicate the flag bit whether converter unit needs Further Division, wherein, N=2
k, k is more than or equal to 2 integer.
25. 1 kinds of encoders, is characterized in that, described encoder applies is in 3 d video encoding or multi-view video coding, and described encoder comprises depth image intraframe coding device described in the claims 13-18 any one.
26. 1 kinds of decoders, is characterized in that, described decoder application is in the decoding of 3 d video encoding or multi-angle video, and described decoder comprises depth image intraframe decoder device described in the claims 19-24 any one.
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