CN104079945A - Multi-view distribution type video coding system frame arrangement selecting method - Google Patents
Multi-view distribution type video coding system frame arrangement selecting method Download PDFInfo
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Abstract
The invention belongs to the technical field of distribution type video coding and provides a criterion for selecting arrangement modes of multi-view distribution type video coding system frames according to requirements of a multi-view distribution type coding system. According to the adopted technical scheme, the multi-view distribution type video coding system frame arrangement selecting method comprises the following steps that three arrangement modes of the multi-view distribution type video coding system frames include the checkerboard type mode, the nonlinear mode and the low delay mode; the arrangement model and the arrangement characteristics of each frame are analyzed, different arrangement modes of the multi-view distribution type video coding system frames are selected according to the analysis results, and when the video system requires high reconstruction quality, the checkerboard type arrangement mode is selected; when the multiple views of the video system are in the nonlinear type, the nonlinear arrangement mode is selected; when the video system requires high real-time performance, the low delay arrangement mode is selected. The multi-view distribution type video coding system frame arrangement selecting method is mainly applied to distribution type video coding.
Description
Technical field
The invention belongs to distributed video coding technical field, relate in particular to a kind of many viewpoints distributed video coding system-frame and arrange system of selection.
Technical background
Distributed video coding is a kind of emerging video coding technique, it can make motion estimation and compensation prediction transfer to decoding end from coding side, effectively reduced coding side complexity, be applicable to the video system of low complex degree, low-power consumption, as wireless supervisory control system, wireless video system etc.Many viewpoints distributed video coding is compared more video scene information can be provided with traditional single view Video coding.
In many viewpoints distributed video coding, the acquisition of side information is the key component of whole system, directly affects the reconstruction quality of the non-key frame of decoding end.Side information in many viewpoints distributed video coding system comprises side information and time side information between viewpoint, and different side information generation methods is arranged with much relations with the frame of many viewpoints distributed video coding.Different frame arrangement modes adopts the generating mode of side information between different time side informations and viewpoint, in video reconstruction quality and the reconstitution time of decoding end decoding and the distribution situation of viewpoint is had to different impacts.For this impact, be badly in need of a kind of criterion of selecting many viewpoints distributed video coding system-frame arrangement mode according to many viewpoints distributed coding system requirements.
Summary of the invention
In order to overcome the deficiencies in the prior art, a kind of criterion of selecting many viewpoints distributed video coding system-frame arrangement mode according to many viewpoints distributed coding system requirements is proposed.For this reason, the technical scheme that the present invention takes is that many viewpoints distributed video coding system-frame is arranged system of selection, comprises the steps: that many viewpoints distributed video coding system-frame arrangement mode has three kinds, is respectively pattern, nonlinear type and low time delay type; Analyze every kind of frame arranged model and arrangement feature, according to analysis result, select different many viewpoints distributed video system-frame arrangement modes, when video system requires high reconstruction quality, select pattern arrangement mode; When a plurality of viewpoints of video system are distributed in non-rectilinear situation, select nonlinear type arrangement mode; When video system requires high real-time, select low time delay type arrangement mode.
Analyzing every kind of frame arranged model and arrangement feature is specially:
Many viewpoints of pattern distributed video coding frame arrangement mode, key frame and non-key frame period are arranged; On time orientation, non-key frame is that through motion compensated interpolation method, reconstruct obtains time side information according to former and later two key frames; In viewpoint direction, non-key frame is that the key frame by adjacent viewpoint with it obtains side information between viewpoint through difference vector interpolation method; By many viewpoints of pattern distributed video coding system-frame arrangement mode, the process such as between time side information, viewpoint, the acquisition of side information is all the estimation through two frames, motion compensation obtains, so the mass ratio of reconstructed frame is higher; But inner in viewpoint, motion compensated interpolation method cause decoding order and DISPLAY ORDER inconsistent, cause occurring certain decoding time delay; Between viewpoint, difference vector interpolation method requires viewpoint to distribute point-blank, or 3 at least adjacent viewpoints point-blank, and this just distributes and proposed certain requirement the viewpoint of coding side;
Many viewpoints of nonlinear type distributed video system-frame arrangement mode, on time orientation, key frame and non-key frame period are arranged, and the time side information of non-key frame is obtained through motion compensated interpolation method by former and later two key frames, and the reconstructed frame obtaining through reconstruct; In viewpoint direction, i.e. the frame of different points of view synchronization, is that key frame and non-key frame alternately occur in the arrangement of the frame of the different points of view of synchronization; The side information of the non-key frame of each viewpoint is that the key frame by the synchronization of adjacent with it viewpoint obtains by difference vector extrapolation; By many viewpoints of nonlinear type distributed video coding system-frame arrangement mode, the acquisition of time side information is the estimation through two frames, movement compensation process obtains, so the mass ratio of time side information is higher, but motion compensated interpolation method cause decoding order and DISPLAY ORDER inconsistent, there is certain decoding time delay; Between viewpoint, adopt difference vector extrapolation to obtain, only from a direction, carry out estimation, motion compensation etc., relatively between pattern distribution mode viewpoint, side information is more of poor quality, but difference vector extrapolation viewpoint can be distributed on non-rectilinear, is applicable to more viewpoint distribution situation;
Low many viewpoints of time delay type distributed video system-frame arrangement mode, the front cross frame of odd-viewpoint is all key frame, since the 3rd frame, occurs non-key frame, after this key frame, non-key frame alternately occur; The front cross frame of even number viewpoint is non-key frame, and the 3rd frame is key frame, and after this key frame, non-key frame alternately occur; A frame after the front cross frame of odd-viewpoint is extrapolated, the non-key frame after then extrapolated with a rear key frame using the non-key frame of current decoding as decoded frame; The second frame of even number viewpoint and extrapolated the 4th frame of the 3rd frame etc.; The second, in viewpoint direction, in the arrangement of the frame of the different points of view of synchronization, be that key frame and non-key frame alternately occur; The side information of the non-key frame of each viewpoint is that the key frame by the synchronization of adjacent with it viewpoint obtains by difference vector interpolation method; By low many viewpoints of time delay type distributed video coding system-frame arrangement mode, between viewpoint, the acquisition of side information is the estimation through two frames, the processes such as motion compensation obtain, so the mass ratio of side information is higher between viewpoint, but difference vector interpolation method requires viewpoint to distribute point-blank, or 3 at least adjacent viewpoints point-blank, this just distributes and has proposed certain requirement the viewpoint of coding side; In viewpoint, adopt motion compensation extrapolation to obtain, only from a direction, carry out estimation, motion compensation etc., between pattern distribution mode viewpoint, side information is more of poor quality relatively, but the decoding order of video is consistent with DISPLAY ORDER, decoding time delay reduces greatly, is suitable for the video system that requirement of real-time is high.
Compared with the prior art, technical characterstic of the present invention and effect:
By the comparison of frame aligning method, the present invention can select different many viewpoints distributed video system-frame arrangement modes according to the requirement of different video coded system, when video system requires high reconstruction quality, selects pattern arrangement mode; When a plurality of viewpoints of video system are distributed in non-rectilinear situation, select nonlinear type arrangement mode; When video system requires high real-time, select low time delay type arrangement mode.
Accompanying drawing explanation
Many viewpoints distributed video coding system-frame arrangement mode of Fig. 1 pattern of the present invention.
Fig. 2 nonlinear many viewpoints distributed video coding system-frame arrangement mode of the present invention.
Many viewpoints distributed video coding system-frame arrangement mode of Fig. 3 low time delay type of the present invention.
Fig. 4 flow chart of steps of the present invention.
Embodiment
Many viewpoints distributed video coding system, coding side complexity is transferred to decoding end, be applicable to the video coding system of low complex degree, for different video coding systems, the decode time of the distributing position of the reconstruction quality of video, viewpoint and video is had to different requirements, and the reconstruction quality of video and decode time are conflicts.Therefore for the requirement of different video systems, be badly in need of a kind of many viewpoints distributed video coding system-frame and arrange selection criterion.
The many viewpoints distributed video coding system-frame arrangement mode existing at present has three kinds, is respectively pattern, nonlinear type and low time delay type.Introduce respectively every kind of frame arranged model and arrangement feature, analyze and obtain many viewpoints distributed video coding system-frame arrangement choice criteria.
Many viewpoints of pattern distributed video coding frame arrangement mode, key frame and non-key frame period are arranged.On time orientation, non-key frame is that through motion compensated interpolation method, reconstruct obtains time side information according to former and later two key frames.In viewpoint direction, non-key frame is that the key frame by adjacent viewpoint with it obtains side information between viewpoint through difference vector interpolation method.By many viewpoints of pattern distributed video coding system-frame arrangement mode, the process such as between time side information, viewpoint, the acquisition of side information is all the estimation through two frames, motion compensation obtains, so the mass ratio of reconstructed frame is higher.But inner in viewpoint, motion compensated interpolation method cause decoding order and DISPLAY ORDER inconsistent, cause occurring certain decoding time delay.Between viewpoint, difference vector interpolation method requires viewpoint to distribute point-blank, or 3 at least adjacent viewpoints point-blank, and this just distributes and proposed certain requirement the viewpoint of coding side.
Many viewpoints of nonlinear type distributed video system-frame arrangement mode, on time orientation, key frame and non-key frame period are arranged, and the time side information of non-key frame is obtained through motion compensated interpolation method by former and later two key frames, and the reconstructed frame obtaining through reconstruct.In viewpoint direction, i.e. the frame of different points of view synchronization, is that key frame and non-key frame alternately occur in the arrangement of the frame of the different points of view of synchronization.The side information of the non-key frame of each viewpoint is that the key frame by the synchronization of adjacent with it viewpoint obtains by difference vector extrapolation.By many viewpoints of nonlinear type distributed video coding system-frame arrangement mode, the acquisition of time side information is the estimation through two frames, the processes such as motion compensation obtain, so the mass ratio of time side information is higher, but motion compensated interpolation method cause decoding order and DISPLAY ORDER inconsistent, there is certain decoding time delay.Between viewpoint, adopt difference vector extrapolation to obtain, only from a direction, carry out estimation, motion compensation etc., relatively between pattern distribution mode viewpoint, side information is more of poor quality, but difference vector extrapolation viewpoint can be distributed on non-rectilinear, goes for more viewpoint distribution situation.
Low many viewpoints of time delay type distributed video system-frame arrangement mode, the front cross frame of odd-viewpoint is all key frame, since the 3rd frame, occurs non-key frame, after this key frame, non-key frame alternately occur.The front cross frame of even number viewpoint is non-key frame, and the 3rd frame is key frame, and after this key frame, non-key frame alternately occur.A frame after the front cross frame of odd-viewpoint is extrapolated, the non-key frame after then extrapolated with a rear key frame using the non-key frame of current decoding as decoded frame.The second frame of even number viewpoint and extrapolated the 4th frame of the 3rd frame etc.The second, in viewpoint direction, in the arrangement of the frame of the different points of view of synchronization, be that key frame and non-key frame alternately occur.The side information of the non-key frame of each viewpoint is that the key frame by the synchronization of adjacent with it viewpoint obtains by difference vector interpolation method.By low many viewpoints of time delay type distributed video coding system-frame arrangement mode, between viewpoint, the acquisition of side information is the estimation through two frames, the processes such as motion compensation obtain, so the mass ratio of side information is higher between viewpoint, but difference vector interpolation method requires viewpoint to distribute point-blank, or 3 at least adjacent viewpoints point-blank, this just distributes and has proposed certain requirement the viewpoint of coding side.In viewpoint, adopt motion compensation extrapolation to obtain, only from a direction, carry out estimation, motion compensation etc., between pattern distribution mode viewpoint, side information is more of poor quality relatively, but the decoding order of video is consistent with DISPLAY ORDER, decoding time delay reduces greatly, is suitable for the video system that requirement of real-time is high.
The present invention will be described in more detail by reference to the accompanying drawings.
As shown in Figure 1, in many viewpoints distributed video coding system-frame Pareto diagram of described pattern, laterally represent the time, longitudinally represent viewpoint.K represents key frame, and WZ represents non-key frame.On time orientation, WZ frame is that through motion compensated interpolation method, reconstruct obtains time side information according to former and later two K frames.In viewpoint direction, WZ frame is that the K frame by adjacent viewpoint with it obtains side information between viewpoint through difference vector interpolation method.Frame aligning method for many viewpoints distributed video coding of pattern of the present invention, decoding order is as follows: for the edge information decoding between viewpoint, it is the first frame of No. 1 viewpoint of first decoding, the first frame of No. 3 viewpoints of simultaneously decoding, then by the first frame of No. 2 viewpoints of difference vector interpolation method decoding.Successively in this order, between viewpoint, decode, the K frame of first decoding, then pass through difference vector interpolation method decoding WZ frame by decoded K frame.Viewpoint inner (No. 1 viewpoint of take is example), first by reconstruct decoding No. 1 frame (K frame), No. 3 frames (K frame) of decoding again, then by decoded 2 K frames, through motion compensated interpolation method, obtain the side information of No. 2 frames (WZ) frame, thereby reconstruct frame No. 2, other interframe decoding by that analogy.
As shown in Figure 2, in described nonlinear many viewpoints distributed video coding system-frame Pareto diagram, laterally represent the time, longitudinally represent viewpoint.On time orientation, K frame and WZ frame period are arranged, and the time side information of WZ frame is obtained through motion compensated interpolation method by former and later two K frames, through reconstruct, obtain reconstruct WZ frame.In viewpoint direction, i.e. the frame of different points of view synchronization, is that K frame and WZ frame alternately occur in the arrangement of the frame of the different points of view of synchronization.The side information of the WZ frame of each viewpoint is that the K frame by the synchronization of adjacent with it viewpoint obtains by difference vector extrapolation.Frame aligning method for nonlinear many viewpoints distributed video coding of the present invention, decoding order is as follows: for the edge information decoding between viewpoint, it is the first frame of No. 1 viewpoint of first decoding, the first frame of No. 2 viewpoints of simultaneously decoding, then by the first frame of No. 3 viewpoints of difference vector extrapolation decoding.Successively in this order, between viewpoint, decode, the K frame of first decoding, then pass through difference vector extrapolation decoding WZ frame by decoded K frame.Viewpoint inner (No. 1 viewpoint of take is example), first by reconstruct decoding No. 1 frame (K frame), No. 3 frames (K frame) of decoding again, then by decoded 2 K frames, through motion compensated interpolation method, obtain the side information of No. 2 frames (WZ) frame, thereby reconstruct frame No. 2, other interframe decoding by that analogy.
As shown in Figure 3, in many viewpoints distributed video coding system-frame Pareto diagram of described low time delay type, laterally represent the time, longitudinally represent viewpoint.The front cross frame of odd-viewpoint is all K frame, since the 3rd frame, occurs WZ frame, and after this K frame, WZ frame alternately occur.The front cross frame of even number viewpoint is WZ frame, and the 3rd frame is K frame, and after this K frame, WZ frame alternately occur.A frame after the front cross frame of odd-viewpoint is extrapolated, the WZ frame after then extrapolated with a rear K frame using the WZ frame of current decoding as decoded frame.The second frame of even number viewpoint and extrapolated the 4th frame of the 3rd frame etc.The second, in viewpoint direction, in the arrangement of the frame of the different points of view of synchronization, be that K frame and WZ frame alternately occur.The side information of the WZ frame of each viewpoint is that the K frame by the synchronization of adjacent with it viewpoint obtains by difference vector interpolation method.Frame aligning method for many viewpoints distributed video coding of low time delay type of the present invention, decoding order is as follows: for the edge information decoding between viewpoint, it is the first frame of No. 1 viewpoint of first decoding, the first frame of No. 3 viewpoints of simultaneously decoding, then by the first frame of No. 2 viewpoints of difference vector interpolation method decoding.Successively in this order, between viewpoint, decode, the K frame of first decoding, then pass through difference vector interpolation method decoding WZ frame by decoded K frame.Viewpoint inner (No. 1 viewpoint of take is example), first by reconstruct decoding No. 1 frame (K frame), No. 2 frames (K frame) of decoding again, then by decoded 2 K frames, through motion compensation extrapolation, obtain the side information of No. 2 frames (WZ) frame, thereby reconstruct frame No. 2, other interframe decoding by that analogy.
Claims (2)
1. the distributed video coding of viewpoint more than system-frame is arranged a system of selection, it is characterized in that, comprises the steps: that many viewpoints distributed video coding system-frame arrangement mode has three kinds, is respectively pattern, nonlinear type and low time delay type; Analyze every kind of frame arranged model and arrangement feature, according to analysis result, select different many viewpoints distributed video system-frame arrangement modes, when video system requires high reconstruction quality, select pattern arrangement mode; When a plurality of viewpoints of video system are distributed in non-rectilinear situation, select nonlinear type arrangement mode; When video system requires high real-time, select low time delay type arrangement mode.
2. many viewpoints distributed video coding system-frame as claimed in claim 1 is arranged system of selection, it is characterized in that, analyzes every kind of frame arranged model and arrangement feature and is specially:
Many viewpoints of pattern distributed video coding frame arrangement mode, key frame and non-key frame period are arranged; On time orientation, non-key frame is that through motion compensated interpolation method, reconstruct obtains time side information according to former and later two key frames; In viewpoint direction, non-key frame is that the key frame by adjacent viewpoint with it obtains side information between viewpoint through difference vector interpolation method; By many viewpoints of pattern distributed video coding system-frame arrangement mode, the process such as between time side information, viewpoint, the acquisition of side information is all the estimation through two frames, motion compensation obtains, so the mass ratio of reconstructed frame is higher; But inner in viewpoint, motion compensated interpolation method cause decoding order and DISPLAY ORDER inconsistent, cause occurring certain decoding time delay; Between viewpoint, difference vector interpolation method requires viewpoint to distribute point-blank, or 3 at least adjacent viewpoints point-blank, and this just distributes and proposed certain requirement the viewpoint of coding side;
Many viewpoints of nonlinear type distributed video system-frame arrangement mode, on time orientation, key frame and non-key frame period are arranged, and the time side information of non-key frame is obtained through motion compensated interpolation method by former and later two key frames, and the reconstructed frame obtaining through reconstruct; In viewpoint direction, i.e. the frame of different points of view synchronization, is that key frame and non-key frame alternately occur in the arrangement of the frame of the different points of view of synchronization; The side information of the non-key frame of each viewpoint is that the key frame by the synchronization of adjacent with it viewpoint obtains by difference vector extrapolation; By many viewpoints of nonlinear type distributed video coding system-frame arrangement mode, the acquisition of time side information is the estimation through two frames, movement compensation process obtains, so the mass ratio of time side information is higher, but motion compensated interpolation method cause decoding order and DISPLAY ORDER inconsistent, there is certain decoding time delay; Between viewpoint, adopt difference vector extrapolation to obtain, only from a direction, carry out estimation, motion compensation etc., relatively between pattern distribution mode viewpoint, side information is more of poor quality, but difference vector extrapolation viewpoint can be distributed on non-rectilinear, is applicable to more viewpoint distribution situation;
Low many viewpoints of time delay type distributed video system-frame arrangement mode, the front cross frame of odd-viewpoint is all key frame, since the 3rd frame, occurs non-key frame, after this key frame, non-key frame alternately occur; The front cross frame of even number viewpoint is non-key frame, and the 3rd frame is key frame, and after this key frame, non-key frame alternately occur; A frame after the front cross frame of odd-viewpoint is extrapolated, the non-key frame after then extrapolated with a rear key frame using the non-key frame of current decoding as decoded frame; The second frame of even number viewpoint and extrapolated the 4th frame of the 3rd frame etc.; The second, in viewpoint direction, in the arrangement of the frame of the different points of view of synchronization, be that key frame and non-key frame alternately occur; The side information of the non-key frame of each viewpoint is that the key frame by the synchronization of adjacent with it viewpoint obtains by difference vector interpolation method; By low many viewpoints of time delay type distributed video coding system-frame arrangement mode, between viewpoint, the acquisition of side information is the estimation through two frames, the processes such as motion compensation obtain, so the mass ratio of side information is higher between viewpoint, but difference vector interpolation method requires viewpoint to distribute point-blank, or 3 at least adjacent viewpoints point-blank, this just distributes and has proposed certain requirement the viewpoint of coding side; In viewpoint, adopt motion compensation extrapolation to obtain, only from a direction, carry out estimation, motion compensation etc., between pattern distribution mode viewpoint, side information is more of poor quality relatively, but the decoding order of video is consistent with DISPLAY ORDER, decoding time delay reduces greatly, is suitable for the video system that requirement of real-time is high.
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| US20090147841A1 (en) * | 2007-12-11 | 2009-06-11 | Electronics And Telecommunications Research Institute | Distributed video coding apparatus and method capable of controlling encoding rate |
| CN102611893A (en) * | 2012-03-09 | 2012-07-25 | 北京邮电大学 | DMVC (distributed multi-view video coding) side-information integration method on basis of histogram matching and SAD (security association database) judgment |
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Application publication date: 20141001 |