CN102790892A - Depth map coding method and device - Google Patents
Depth map coding method and device Download PDFInfo
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Abstract
The invention provides a depth map coding method and a device. The depth map coding method includes establishing a plurality of partition lines which are used for performing wedge-shape partition to a depth macro block, and forming the partition lines into a partition set; using an intra coding mode to code the depth micro block to obtain a first rate-distortion cost value; judging whether an inter coding mode is used for coding the depth micro block and using the inter coding mode to code the depth micro block to obtain a second rate-distortion cost value if the inter coding mode is used for coding the depth micro block; and continuing judging whether the depth micro block contains a discontinuous motion vector field and using a geometric partitioning coding mode to code the depth micro block if the depth micro block contains the discontinuous motion vector field, wherein the geometric partitioning coding mode includes selecting an optimal partition line to partition the depth micro block to obtain a first depth subdomain and a second depth subdomain and subjecting the two subdomains to predictive coding to obtain a third rate-distortion cost value; and comparing the rate-distortion cost values in different coding modes so as to select the coding mode with the minimum rate-distortion cost value for coding the depth micro block. According to the depth map coding method and the device, depth map compression efficiencies are improved, and coding complexities are reduced.
Description
Technical field
The present invention relates to technical field of video coding, particularly a kind of depth map encoding method and apparatus.
Background technology
In three-dimensional video-frequency and free viewpoint video system, the data format that is made up of multi-view point video and multi-view depth figure has obtained to use widely.Wherein, the degree of depth is meant that each pixel in the frame of video corresponds to point in the three dimensions to the distance of camera plane.In three-dimensional video-frequency, in order to obtain the pairing video information of viewpoint that user expectation is watched through virtual viewpoint rendering, we need obtain the pairing depth map of each frame of video.Therefore, stereoscopic video sequence comprises multichannel color video information and the pairing depth map sequence of each road color video usually.Because the depth information of each pixel is an integer value between the 0-255 in the depth map, so depth map can be counted as the video sequence that a series of gray level image is formed.In order effectively to store and transmit the stereo video data of magnanimity, the three-dimensional video-frequency system adopts multi-view point video encoding method that multi-view point video and depth map sequence are compressed respectively usually.Through in the viewpoint and look a predictive coding, multi-view point video encoding method can compress the redundancy between the multichannel depth map effectively.
A kind of multiple view video coding that traditional multi-view point video encoding method is based on the coding standard is H.264/MPEG-4 expanded scheme.In traditional multiple view video coding, encoder is to encode to each two field picture in the unit with the macro block.The macro block of each 16 * 16 size can further be divided into the inferior piece of 16 * 8,8 * 16 and 8 * 8 sub-pieces and 8 * 4,4 * 8 and 4 * 4 again.Different sub-piece and inferior pieces are called as predicting unit.In cataloged procedure, encoder carries out estimation to each predicting unit, obtains the rate distortion costs of motion compensated prediction.Carry out model selection then, obtain each piece optimum coding mode and prediction residual, and residual error is carried out transition coding based on rate-distortion optimization.Experiment showed, that traditional multiple view video coding can obtain compression performance preferably on depth map.
Be different from traditional color video, depth map only comprises the range information of each pixel, does not comprise any video texture information.Therefore, the coded macroblocks that is in interior of articles in the depth map only comprises the depth texture of homogeneous, and the coded macroblocks that is in object edge then comprises two or more discontinuous depth areas.Traditional macroblock partitions can't be represented object edge effectively.Especially under the condition of low encoder bit rate, the sub-piece that obtains through division and inferior block mode is less is selected for use.Yet when adopting traditional multi-view point video encoding method to depth map encoding, encoder still need carry out estimation and mode decision to all macro block modes.The computational resource that this process need consumption is a large amount of has increased the complexity of coding side.
In order to obtain higher depth map compression efficiency, need characteristics design coding method more efficiently to depth map.For this reason, the present invention is directed to depth map and only comprise this characteristic of object profile information, propose a kind of depth map encoding method based on how much divisions.Divide through the degree of depth macro block that comprises the discontinuous fluid field being carried out adaptive geometric, obtained the better prediction result.Thereby improve the efficient of depth map encoding, reduce the complexity of depth map encoding simultaneously.
The patent more relevant with the present invention that can find at present has four; The depth map encoding compression method of a kind of 3DTV of being applied to and FTV system is disclosed respectively; Deepness image encoding method in a kind of stereo-television system, the coding method of the coding method of depth image and a kind of multi-view depth video in a kind of stereo-television system, application number is respectively 200810063741.9; 200810161597.2,200810120082.8 and 200910154138.6.Although four mentioned patents all relate to the coding method of depth map in the three-dimensional video-frequency, first, second and the 3rd patent have only proposed a kind of encoding scheme that the degree of depth macro block of zones of different is adopted the different quantized parameter respectively.Different degree of depth macro block classification method that difference has been these three conceptual designs; The 4th patent then limits the degree of depth macroblock encoding pattern in different zones, sets more coding mode for the degree of depth macro block in object edge zone, and the degree of depth macro block in non-object edge zone is set less coding mode.Yet the division methods that all corresponding predicting unit of coding mode remain based on defined in traditional H.264/MPEG-4 AVC coding standard in this invention obtains.Therefore, four mentioned patents all do not relate to the depth map encoding method of dividing based on how much.
Summary of the invention
The present invention is intended to one of solve the problems of the technologies described above at least.
For this reason, one object of the present invention is to propose a kind of depth map encoding method that can improve the depth map compression efficiency and reduce the encoder complexity of depth map.
Another object of the present invention is to propose a kind of depth map encoding device.
To achieve these goals, the embodiment of first aspect present invention has proposed a kind of depth map encoding method, may further comprise the steps: set up a plurality of dividing lines and form the division set, wherein, a plurality of dividing lines are used for that degree of depth macro block is carried out wedge shape and divide; With intra-frame encoding mode degree of depth macro block is encoded to obtain the first corresponding rate distortion costs value; Judge whether said degree of depth macro block to be encoded, if then said degree of depth macro block is encoded to obtain the second corresponding rate distortion costs value with interframe encoding mode with interframe encoding mode; Continue to judge whether said degree of depth macro block comprises discontinuous motion vector field; If said degree of depth macro block carries out interframe encode and comprises discontinuous motion vector field; Then dividing coding mode with how much encodes to said degree of depth macro block; Wherein, Said how much divide coding modes further comprises: from said division set, select the optimal dividing line that said degree of depth macro block is divided obtaining first and second degree of depth subregions according to the monochrome information of all pixels of said degree of depth macro block, and respectively said first and second degree of depth subregions are carried out estimation and predictive coding to obtain the 3rd rate distortion costs value of correspondence; And the rate distortion costs value that compares degree of depth macro block under the different coding pattern, said degree of depth macro block is encoded according to the minimum coding mode of comparative result selection rate distortion cost.
In addition, depth map encoding method according to the above embodiment of the present invention can also have following additional technical characterictic:
In some instances, said partition set is combined into:
G={ξ(ρ
i,θ
i)|i＝1,2,…,L}，
Wherein, ξ (ρ
i, θ
i) be the i bar dividing line in the said dividing line set, ρ
iBe the distance of degree of depth macro block to this dividing line, θ
iBe the angle of this dividing line and first direction, L is the number of dividing line.
In some instances, said degree of depth macro block to the distance of a plurality of dividing lines all be positioned at [0,8) between, the angle of a plurality of dividing lines and first direction all be positioned at [0,2 π) between.
In some instances, the said step of judging whether degree of depth macro block comprises discontinuous motion vector field further comprises: the brightness value that obtains all pixels in the said degree of depth macro block; Calculate the variance of the brightness value of all pixels in the said degree of depth macro block; And the size of more said variance and predetermined threshold value, if, then judging said degree of depth macro block greater than said predetermined threshold value, said variance comprises discontinuous motion vector field.
In some instances; Monochrome information according to all pixels of said degree of depth macro block is selected the optimal dividing line from said division set; The step that said degree of depth macro block is divided to obtain first and second degree of depth subregions further comprises: with each the bar dividing line in the said division set said degree of depth macro block is divided respectively, and the average brightness value that calculates in two parts of dividing gained all pixels separately respectively is to obtain the corresponding first and the average brightness value of second portion; Respectively the poor difference that obtains is done by the first of each bar dividing line correspondence and the average brightness value of second portion; And obtain the maximum dividing line of the absolute value that makes difference as said optimal dividing line, so that said degree of depth macro block is divided to obtain first and second degree of depth subregions.
In some instances; The said degree of depth macro block coding with intra-frame encoding mode comprises with the step of obtaining the first corresponding rate distortion costs value: the intra-frame encoding mode according in the AVC coding standard H.264/MPEG-4 carries out intraframe coding to said degree of depth macro block, and with the optimum rate distortion costs of correspondence as the said first rate distortion costs value; The said degree of depth macro block coding with interframe encoding mode comprises with the step of obtaining the second corresponding rate distortion costs value: the interframe encoding mode according in the coding standard H.264/MPEG-4AVC carries out coded in inter mode to said degree of depth macro block, and with the optimum rate distortion costs of correspondence as the said second rate distortion costs value.
In some instances; The rate distortion costs value of degree of depth macro block under the said relatively different coding pattern; Step according to the minimum coding mode of comparative result selection rate distortion cost said degree of depth macro block is encoded comprises: if judgement is not carried out interframe encode to said degree of depth macro block, then only said degree of depth macro block is carried out intraframe coding; Carry out interframe encode and do not comprise discontinuous motion vector field if judge said degree of depth macro block, then select less rate distortion costs value corresponding interframe encoding mode or intra-frame encoding mode that said degree of depth macro block is encoded according to the comparative result of the first and second rate distortion costs values; And if judge that said degree of depth macro block carries out interframe encode and comprises discontinuous motion vector field, then select the corresponding interframe encoding mode of minimum rate distortion costs value, intra-frame encoding mode or divide coding modes for how much said degree of depth macro block is encoded according to the comparative result of first to the 3rd rate distortion costs value.
The embodiment of second aspect present invention has proposed a kind of depth map encoding device, and comprising: dividing line is set up module, is used to set up a plurality of dividing lines and forms the division set, and wherein, a plurality of dividing lines are used for that degree of depth macro block is carried out wedge shape and divide; The intraframe coding module is used for intra-frame encoding mode degree of depth macro block being encoded to obtain the first corresponding rate distortion costs value; The interframe encode judge module is used to judge whether with interframe encoding mode said degree of depth macro block is encoded; The interframe encode module is used for when said interframe encode judge module judgement is encoded to said degree of depth macro block with interframe encoding mode, with interframe encoding mode degree of depth macro block being encoded to obtain the second corresponding rate distortion costs value; Divide judge module, be used to judge whether said degree of depth macro block comprises discontinuous motion vector field for how much; Divide coding module how much; Be used for when said how much division judge modules judge that said degree of depth macro block comprises discontinuous motion vector field; Dividing coding mode with how much encodes to said degree of depth macro block; Wherein, Said how much divide coding modes comprises: from said division set, select the optimal dividing line that said degree of depth macro block is divided obtaining first and second degree of depth subregions according to the monochrome information of all pixels of said degree of depth macro block, and respectively said first and second degree of depth subregions are carried out estimation and predictive coding to obtain the 3rd rate distortion costs value of correspondence; And coding mode selects module, is used for the rate distortion costs value of more said degree of depth macro block under the different coding pattern, with according to the minimum coding mode of comparative result selection rate distortion cost so that said degree of depth macro block is encoded.
In addition, depth map encoding device according to the above embodiment of the present invention can also have following additional technical characterictic:
In some instances, said partition set is combined into:
G={ξ(ρ
i,θ
i)|i＝1,2,…,L}，
Wherein, ξ (ρ
i, θ
i) be the i bar dividing line in the said dividing line set, ρ
iBe the distance of degree of depth macro block to this dividing line, θ
iBe the angle of this dividing line and first direction, L is the number of dividing line.
In some instances, said degree of depth macro block to the distance of a plurality of dividing lines all be positioned at [0,8) between, the angle of a plurality of dividing lines and first direction all be positioned at [0,2 π) between.
In some instances; Divide the brightness value that judge module is used for obtaining said all pixels of degree of depth macro block said how much; And calculate the variance of the brightness value of all pixels in the said degree of depth macro block; And the size of more said variance and predetermined threshold value, if, then judging said degree of depth macro block greater than said predetermined threshold value, said variance comprises discontinuous motion vector field.
In some instances; Said how much division coding modules are used for each bar dividing line of said division set said degree of depth macro block being divided respectively; And average brightness value that calculate to divide in two parts of gained all pixels separately respectively is to obtain the corresponding first and the average brightness value of second portion; Respectively the poor difference that obtains is done by the first of each bar dividing line correspondence and the average brightness value of second portion; And obtain the maximum dividing line of the absolute value that makes difference as said optimal dividing line, so that said degree of depth macro block is divided to obtain first and second degree of depth subregions.
In some instances, said intraframe coding module is used for according to the intra-frame encoding mode of AVC coding standard H.264/MPEG-4 said degree of depth macro block being carried out intraframe coding, and with the optimum rate distortion costs of correspondence as the said first rate distortion costs value; Said interframe encode module is used for according to the interframe encoding mode of AVC coding standard H.264/MPEG-4 said degree of depth macro block being carried out coded in inter mode, and with the optimum rate distortion costs of correspondence as the said second rate distortion costs value.In some instances; Said coding mode selects module to be used for when said degree of depth macro block not being carried out interframe encode; Only select intra-frame encoding mode; When said degree of depth macro block carries out interframe encode and does not comprise discontinuous motion vector field; Select less rate distortion costs value corresponding interframe encoding mode or intra-frame encoding mode according to the comparative result of the first and second rate distortion costs values; When said degree of depth macro block carries out interframe encode and comprises discontinuous motion vector field, select the corresponding interframe encoding mode of minimum rate distortion costs value, intra-frame encoding mode or divide coding mode how much according to the comparative result of first to the 3rd rate distortion costs value.
Depth map encoding method and device according to the embodiment of the invention; Through the depth map encoding method of design based on how much divisions; Select best coding mode that degree of depth macro block is encoded according to reasonable manner from interframe encoding mode, intra-frame encoding mode or how much division coding modes, thus, not only improved the depth map compression efficiency, reduced compression time; Also reduce the complexity of depth map encoding, realize high efficient coding depth map.
Additional aspect of the present invention and advantage part in the following description provide, and part will become obviously from the following description, or recognize through practice of the present invention.
Description of drawings
Above-mentioned and/or additional aspect of the present invention and advantage obviously with are easily understood becoming the description of embodiment from combining figs, wherein:
Fig. 1 is the flow chart of the depth map encoding method of the embodiment of the invention;
The schematic diagram that Fig. 2 divides degree of depth macro block for the dividing line of one embodiment of the invention depth map encoding method;
Fig. 3 is the detail flowchart of the depth map encoding method of one embodiment of the invention;
Fig. 4 divides the fundamental diagram of the encoder that coding mode encodes for how much for having of the employing of the depth map encoding method of one embodiment of the invention;
The predict figure that Fig. 5 encodes for the depth map encoding method employing encoder shown in Figure 4 of one embodiment of the invention to degree of depth macroblock prediction coding mode; And
Fig. 6 is the structure chart of the depth map encoding device of the embodiment of the invention.
Embodiment
Describe embodiments of the invention below in detail, the example of said embodiment is shown in the drawings, and wherein identical from start to finish or similar label is represented identical or similar elements or the element with identical or similar functions.Be exemplary through the embodiment that is described with reference to the drawings below, only be used to explain the present invention, and can not be interpreted as limitation of the present invention.
In description of the invention; It will be appreciated that; The orientation of indications such as term " " center ", " vertically ", " laterally ", " on ", D score, " preceding ", " back ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", " outward " or position relation are for based on orientation shown in the drawings or position relation; only be to describe with simplifying for the ease of describing the present invention; rather than the device or the element of indication or hint indication must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as limitation of the present invention.In addition, term " first ", " second " only are used to describe purpose, and can not be interpreted as indication or hint relative importance.
In description of the invention, need to prove that only if clear and definite regulation and qualification are arranged in addition, term " installation ", " linking to each other ", " connection " should be done broad understanding, for example, can be to be fixedly connected, also can be to removably connect, or connect integratedly; Can be mechanical connection, also can be to be electrically connected; Can be directly to link to each other, also can link to each other indirectly through intermediary, can be the connection of two element internals.For those of ordinary skill in the art, can concrete condition understand above-mentioned term concrete implication in the present invention.
For the coded system to the embodiment of the invention is verified; In following example of the present invention; It is the standard test sequences of " Book Arrival " that the cycle tests of stereo scopic video coding adopts the name of SD form; The resolution of this SD format video sequence is 1024 * 768, and this cycle tests comprises the video and corresponding depth map of 16 viewpoints.In following example of the present invention, all to test with the depth map in this cycle tests, the depth map sequence of the 8th viewpoint that adopts this sequence is as cycle tests.This sequence comprises 100 frame depth maps.As shown in Figure 4, codec adopts H.264/MPEG-4 MVC canonical reference software JMVC 6.0; The frame number of encoder GOP (Group of Pictures, image sets) is 8; The time domain prediction coding of coding adopts the Hierarchical B Picture predict of (stratification bi-directional predictive coding frame is called for short stratification B frame), and the coded prediction structure chart is as shown in Figure 5.The size of the degree of depth macro block of each coding is 16 * 16.The precision of estimation is 1/4th pixel precisions.Other coding parameters all adopt with AVC standard H.264/MPEG-4 in predetermined parameter setting in the main file time (Main Profile).
Below in conjunction with accompanying drawing the depth map encoding method according to the embodiment of the invention is described at first.
With reference to figure 1, the depth map encoding method according to the embodiment of the invention comprises the steps:
Step S101 sets up a plurality of dividing lines and forms the division set, and wherein, a plurality of dividing lines are used for that degree of depth macro block is carried out wedge shape and divide.In one embodiment of the invention, partition set is combined into: G={ ξ (ρ
i, θ
i) | i=1,2 ..., L}, wherein, ξ (ρ
i, θ
i) be the i bar dividing line during dividing line is gathered, ρ
iBe the distance of degree of depth macro block to this dividing line, θ
iBe the angle of this dividing line and first direction, L is the number of dividing line.
Division set as shown in Figure 2, that a plurality of dividing lines that the definition wedge shape is divided for how much are formed.The definition dividing line is straight line (dividing line as shown in Figure 2), this straight-line pass to degree of depth macro block central point apart from ρ and this straight line and y axle, promptly the angle theta of first direction is represented.In this embodiment, the distance of a plurality of dividing lines all be positioned at [0,8) between, the angle of a plurality of dividing lines and first direction all is positioned at [0; 2 π) between, promptly the span of two of each dividing line parameter ρ and θ be [0,8) and [0,2 π); The sampling interval of parameter ρ is 1, and its value set is ρ={ 0,1,2;, 7}, the sampling interval of parameter θ is π/16, its value set does
Therefore, divide set G={ ξ (ρ
i, θ
i) | i=1,2 ..., comprise 256 optional dividing lines, i.e. L=256 among the L} altogether.
Step S102 encodes to obtain the first corresponding rate distortion costs value to degree of depth macro block with intra-frame encoding mode.
Particularly, degree of depth macro block is carried out intraframe coding according to the intra-frame encoding mode in the AVC coding standard H.264/MPEG-4, and with the optimum rate distortion costs of correspondence as the first rate distortion costs value.More particularly, coding adopt with traditional H.264/MPEG-4 AVC coding standard in the identical method of the intra-frame encoding mode that defines to this degree of depth macro block, be designated as B
kCarry out intraframe predictive coding.In the present embodiment, current degree of depth macro block optimum rate distortion costs under the intraframe predictive coding pattern does
Promptly the first rate distortion costs value does
Step S103 judges whether with interframe encoding mode degree of depth macro block to be encoded, if then with interframe encoding mode degree of depth macro block is encoded to obtain the second corresponding rate distortion costs value.
Particularly, said degree of depth macro block is carried out coded in inter mode according to the interframe encoding mode in the AVC coding standard H.264/MPEG-4, and with the optimum rate distortion costs of correspondence as the said second rate distortion costs value.In this example, above-mentioned interframe encoding mode is traditional interframe encoding mode.
Step S104; Continue to judge whether degree of depth macro block comprises discontinuous motion vector field; If degree of depth macro block carries out interframe encode and comprises discontinuous motion vector field; Then dividing coding mode with how much encodes to degree of depth macro block; Wherein, how much divide coding modes further comprises: from divide set, select the optimal dividing line that degree of depth macro block is divided obtaining first and second degree of depth subregions according to the monochrome information of all pixels of degree of depth macro block, and respectively first and second degree of depth subregions are carried out estimation and predictive coding to obtain the 3rd rate distortion costs value of correspondence.
Particularly, in some instances, judge whether degree of depth macro block to be encoded, judge that promptly the step whether degree of depth macro block comprises discontinuous motion vector field comprises with how much partition modes:
1, obtains the brightness value of all pixels in the degree of depth macro block.The degree of depth macro block B of present encoding for example
kThe set of whole pixels do
Wherein N represents the number of pixel in this degree of depth macro block, in the present embodiment, and N=256.Suppose this degree of depth macro block B
kThe 529th degree of depth macro block for present frame.If B
kThe brightness value of whole pixels do
Wherein,
Numerical value shown in following matrix:
2, the variance of the brightness value of all pixels in the compute depth macro block.Can know that through calculating the variance of the brightness value of all pixels of this degree of depth macro block Bk is 838.
3, the size that compares variance and predetermined threshold value is if variance, judges then that degree of depth macro block comprises discontinuous motion vector field greater than predetermined threshold value.For example, this predetermined threshold value is T
S=100, B then
kThe variance of the brightness value of all pixels is greater than T
S, therefore judge that degree of depth macro block comprises discontinuous motion vector field.
The step of from divide set, selecting the optimal dividing line that said degree of depth macro block is divided to obtain first and second degree of depth subregions according to the monochrome information of all pixels of degree of depth macro block further comprises:
1, with each bar dividing line of dividing in the set degree of depth macro block is divided respectively, and the average brightness value that calculates in two parts of dividing gained all pixels separately respectively is to obtain corresponding first and second portion average brightness value.For example, encoder is searched for B through each the bar dividing line among the traversal set G
kPairing optimal dividing line.In ergodic process, to each bar dividing line ξ (ρ
i, θ
i), with B
kBe divided into two parts.Calculate in two parts the average brightness value of all pixels separately, for example when the value of parameter ρ and parameter θ was 0, this moment, dividing line was for being positioned at macro block B
kThe vertical line segment at center.This dividing line is with macro block B
kBe divided into the equal-sized two parts in the left and right sides, P
1(ρ
0, θ
0) and P
2(ρ
0, θ
0).At this moment, regional P
1(ρ
0, θ
0) in the average brightness value of all pixels be 40.2; Zone P
2(ρ
0, θ
0) in the average brightness value of all pixels be 68.1.
2, respectively the poor difference that obtains is done by the first of each bar dividing line correspondence and the average brightness value of second portion.According to the example in the step 1, P
1(ρ
0, θ
0) and P
2(ρ
0, θ
0) between average brightness value be poor result and be: d=40.2-68.1=-27.9
3, the dividing line that obtains the absolute value maximum that makes difference is as said optimal dividing line, so that said degree of depth macro block is divided to obtain first and second degree of depth subregions.According to the example in the step 2, the absolute value of difference is: Δ d=|40.2-68.1|=27.9.
In like manner, it is poor that all dividing lines among the dividing line set G are all asked for its degree of depth division of dividing the back correspondence with the mode of step 1-3, divides the dividing line of the dividing line of difference as said current macro optimum with obtaining depth capacity, and the optimal dividing line is designated as ξ (ρ
Opt, θ
Opt).In the present embodiment, for degree of depth macro block B
kDepth capacity divide difference and be Δ d
Max=65.6.The optimal dividing line ξ (ρ that it is corresponding
Opt, θ
Opt) parameter value be respectively ρ
Opt=4,
According to above-mentioned example, respectively first and second degree of depth subregions are carried out estimation to obtain the 3rd corresponding rate distortion costs value, be specially: to B
kAdopt optimum dividing line ξ (ρ
Opt, θ
Opt) be divided into first and second degree of depth subregions, be designated as P
1(ρ
Opt, θ
Opt) and P
2(ρ
Opt, θ
Opt).Then first and second degree of depth subregions are carried out estimation respectively, and calculate its corresponding rate distortion costs, in this example, B
kThe 3rd rate distortion costs of dividing under the coding mode at geometry does
Step S105, the rate distortion costs value of degree of depth macro block under the comparison different coding pattern is to encode to degree of depth macro block according to the minimum coding mode of comparative result selection rate distortion cost.Particularly, comprise the steps:
If 1 judgement is not carried out interframe encode to degree of depth macro block, then only degree of depth macro block is carried out intraframe coding.
If 2 judge that degree of depth macro block carries out interframe encode and do not comprise discontinuous motion vector field, then select less rate distortion costs value corresponding interframe encoding mode or intra-frame encoding mode that degree of depth macro block is encoded according to the comparative result of the first and second rate distortion costs values.
If 3 judge that degree of depth macro block carries out interframe encode and comprises discontinuous motion vector field, then select the corresponding interframe encoding mode of minimum rate distortion costs value, intra-frame encoding mode perhaps to divide coding mode for how much degree of depth macro block is encoded according to the comparative result of first to the 3rd rate distortion costs value.
As a concrete example, with above-mentioned B
kBe example: to B
kCarry out model selection based on rate-distortion optimization.In the present embodiment, since encoder to B
kCarried out the prediction of how much partition modes, therefore need divide coding mode at how much, the pattern of selection rate distortion cost minimum is as B in interframe encoding mode, these three kinds of patterns of intra-frame encoding mode
kThe optimum code pattern.For B
k, minimum rate distortion costs is:
Therefore, B
kThe optimum code pattern be how much to divide coding modes.This B then
kAdopt how much division coding modes to encode.
Referring to Fig. 3, as a concrete example, the depth map encoding method of the embodiment of the invention can be carried out according to following steps:
Step S110 is provided with how much dividing line set in the partition mode.
Step S120, current macro B begins to encode
k
Step S130 judges B
kWhether be inter-coded macroblocks,, otherwise go to step S220 if then go to step S140.
Step S140 is to B
kCarry out intraframe predictive coding and calculate the rate distortion costs under this pattern, and change step S150 over to.
Step S150 judges B
kWhether carry out coded in inter mode,, otherwise go to step S200 if then go to step S160.
Step S160 is to B
kEmploying conventional inter pattern is encoded and is calculated the rate distortion costs under this pattern, and changes step S170 over to.
Step S170 judges B
kWhether comprise the discontinuous fluid field.If then go to step S180, otherwise go to step S200.
Step S180 is according to B
kIn the corresponding optimal dividing line of monochrome information search of each pixel.
Step S190 carries out estimation and coding to two parts that the optimal dividing line is divided into, and calculates its corresponding rate distortion costs.
Step S200 chooses the minimum pattern of rate distortion costs as B
kThe optimum code pattern.
Step S210 adopts optimization model coding B
k
Step S220 judges B
kWhether be last macro block of present frame.If then end-of-encode, otherwise go among the step S120 so that next degree of depth macro block is encoded.
With reference to figure 6; The further embodiment of the present invention has proposed a kind of depth map encoding device 600; Comprise that dividing line sets up module 610, intraframe coding module 620, interframe encode judge module 630, interframe encode module 640, divide judge module 650 how much, divide coding module 660 how much and coding modes are selected modules 670.Wherein:
Dividing line is set up module 610 and is used to set up a plurality of dividing lines and forms the division set, and wherein, a plurality of dividing lines are used for that degree of depth macro block is carried out wedge shape and divide.Intraframe coding module 620 is used for intra-frame encoding mode degree of depth macro block being encoded to obtain the first corresponding rate distortion costs value.Interframe encode judge module 630 is used to judge whether with interframe encoding mode said degree of depth macro block is encoded.Interframe encode module 640 is used for when 630 judgements of interframe encode judge module are encoded to degree of depth macro block with interframe encoding mode, with interframe encoding mode degree of depth macro block being encoded to obtain the second corresponding rate distortion costs value.Divide judge module 650 how much and be used to judge whether degree of depth macro block comprises discontinuous motion vector field.Dividing coding module 660 for how much is used for when how much division judge modules 650 judge that degree of depth macro blocks comprise discontinuous motion vector field; Dividing coding mode with how much encodes to degree of depth macro block; Wherein, How much divide coding modes comprises: from said division set, select the optimal dividing line that degree of depth macro block is divided obtaining first and second degree of depth subregions according to the monochrome information of all pixels of degree of depth macro block, and respectively first and second degree of depth subregions are carried out estimation and predictive coding to obtain the 3rd rate distortion costs value of correspondence.Coding mode selects module 670 to be used for the rate distortion costs value of comparison degree of depth macro block under the different coding pattern, with according to the minimum coding mode of comparative result selection rate distortion cost so that said degree of depth macro block is encoded.
In some instances, partition set is combined into:
G={ξ(ρ
i,θ
i)|i＝1,2,…,L}，
Wherein, ξ (ρ
i, θ
i) be the i bar dividing line in the said dividing line set, ρ
iBe the distance of degree of depth macro block to this dividing line, θ
iBe the angle of this dividing line and first direction, L is the number of dividing line.
In some instances, degree of depth macro block to the distance of a plurality of dividing lines all be positioned at [0,8) between, the angle of a plurality of dividing lines and first direction all be positioned at [0,2 π) between.
In some instances; Divide the brightness value that judge module 650 is used for obtaining all pixels of degree of depth macro block how much; And the variance of the brightness value of all pixels in the compute depth macro block; And the size of comparison variance and predetermined threshold value, if variance, judges then that degree of depth macro block comprises discontinuous motion vector field greater than said predetermined threshold value.
Further; Dividing coding module 660 for how much is used for each bar dividing line of said division set said degree of depth macro block being divided respectively; And average brightness value that calculate to divide in two parts of gained all pixels separately respectively is to obtain the corresponding first and the average brightness value of second portion; Respectively the poor difference that obtains is done by the first of each bar dividing line correspondence and the average brightness value of second portion; And obtain the maximum dividing line of the absolute value that makes difference as said optimal dividing line, so that said degree of depth macro block is divided to obtain first and second degree of depth subregions.
In some instances, intraframe coding module 620 is used for according to the intra-frame encoding mode of AVC coding standard H.264/MPEG-4 said degree of depth macro block being carried out intraframe coding, and with the optimum rate distortion costs of correspondence as the said first rate distortion costs value.
In some instances, interframe encode module 640 is used for according to the interframe encoding mode of AVC coding standard H.264/MPEG-4 said degree of depth macro block being carried out interframe encode, and with the optimum rate distortion costs of correspondence as the said second rate distortion costs value.
In some instances; Coding mode selects module 670 to be used for when said degree of depth macro block not being carried out interframe encode; Only select intra-frame encoding mode; When said degree of depth macro block carries out interframe encode and does not comprise discontinuous motion vector field; Select less rate distortion costs value corresponding interframe encoding mode or intra-frame encoding mode according to the comparative result of the first and second rate distortion costs values; When said degree of depth macro block carries out interframe encode and comprises discontinuous motion vector field, select the corresponding interframe encoding mode of minimum rate distortion costs value, intra-frame encoding mode or divide coding mode for how much so that said degree of depth macro block is encoded according to the comparative result of first to the 3rd rate distortion costs value.
Depth map encoding method and device according to the embodiment of the invention; Through the depth map encoding method of design based on how much divisions; Select best coding mode that degree of depth macro block is encoded according to reasonable manner from interframe encoding mode, intra-frame encoding mode or how much division coding modes, thus, not only improved the depth map compression efficiency, reduced compression time; Also reduce the complexity of depth map encoding, realize high efficient coding depth map.
In the description of this specification, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means the concrete characteristic, structure, material or the characteristics that combine this embodiment or example to describe and is contained at least one embodiment of the present invention or the example.In this manual, the schematic statement to above-mentioned term not necessarily refers to identical embodiment or example.And concrete characteristic, structure, material or the characteristics of description can combine with suitable manner in any one or more embodiment or example.
Although illustrated and described embodiments of the invention; Those having ordinary skill in the art will appreciate that: under the situation that does not break away from principle of the present invention and aim, can carry out multiple variation, modification, replacement and modification to these embodiment, scope of the present invention is claim and be equal to and limit.
Claims (14)
1. a depth map encoding method is characterized in that, may further comprise the steps:
Set up a plurality of dividing lines and form the division set, wherein, a plurality of dividing lines are used for that degree of depth macro block is carried out wedge shape and divide;
With intra-frame encoding mode degree of depth macro block is encoded to obtain the first corresponding rate distortion costs value;
Judge whether said degree of depth macro block to be encoded, if then said degree of depth macro block is encoded to obtain the second corresponding rate distortion costs value with interframe encoding mode with interframe encoding mode;
Continue to judge whether said degree of depth macro block comprises discontinuous motion vector field; If said degree of depth macro block comprises discontinuous motion vector field and carries out interframe encode; Then dividing coding mode with how much encodes to said degree of depth macro block; Wherein, Said how much divide coding modes further comprises: from said division set, select the optimal dividing line that said degree of depth macro block is divided obtaining first and second degree of depth subregions according to the monochrome information of all pixels of said degree of depth macro block, and respectively said first and second degree of depth subregions are carried out estimation and predictive coding to obtain the 3rd rate distortion costs value of correspondence; And
The rate distortion costs value that compares degree of depth macro block under the different coding pattern is to encode to said degree of depth macro block according to the minimum coding mode of comparative result selection rate distortion cost.
2. depth map encoding method according to claim 1 is characterized in that, said partition set is combined into:
G={ξ(ρ
i,θ
i)|i＝1,2,…,L}，
Wherein, ξ (ρ
i, θ
i) be the i bar dividing line in the said dividing line set, ρ
iBe the distance of degree of depth macro block to this dividing line, θ
iBe the angle of this dividing line and first direction, L is the number of dividing line.
3. depth map encoding method according to claim 2 is characterized in that, said degree of depth macro block to the distance of a plurality of dividing lines all be positioned at [0,8) between, the angle of a plurality of dividing lines and first direction all be positioned at [0,2 π) between.
4. depth map encoding method according to claim 1 is characterized in that, the said step of judging whether degree of depth macro block comprises discontinuous motion vector field further comprises:
Obtain the brightness value of all pixels in the said degree of depth macro block;
Calculate the variance of the brightness value of all pixels in the said degree of depth macro block; And
The size of more said variance and predetermined threshold value comprises discontinuous motion vector field if said variance, is then judged said degree of depth macro block greater than said predetermined threshold value.
5. depth map encoding method according to claim 1; It is characterized in that; According to the monochrome information of all pixels of said degree of depth macro block, the step of from said division set, selecting the optimal dividing line that said degree of depth macro block is divided to obtain first and second degree of depth subregions further comprises:
With each the bar dividing line in the said division set said degree of depth macro block is divided respectively, and the average brightness value that calculates in two parts of dividing gained all pixels separately respectively is to obtain the corresponding first and the average brightness value of second portion;
Respectively each bar dividing line corresponding first and second portion average brightness value are done the poor difference that obtains; And
The dividing line that obtains the absolute value maximum that makes difference is as said optimal dividing line, so that said degree of depth macro block is divided to obtain first and second degree of depth subregions.
6. depth map encoding method according to claim 1 is characterized in that, the said degree of depth macro block coding with intra-frame encoding mode comprises with the step of obtaining the first corresponding rate distortion costs value:
Intra-frame encoding mode according in the AVC coding standard H.264/MPEG-4 carries out intraframe coding to said degree of depth macro block, and with the optimum rate distortion costs of correspondence as the said first rate distortion costs value;
The said degree of depth macro block coding with interframe encoding mode comprises with the step of obtaining the second corresponding rate distortion costs value:
Interframe encoding mode according in the AVC coding standard H.264/MPEG-4 carries out coded in inter mode to said degree of depth macro block, and with the optimum rate distortion costs of correspondence as the said second rate distortion costs value.
7. depth map encoding method according to claim 1; It is characterized in that; The rate distortion costs value of degree of depth macro block under the said relatively different coding pattern comprises with the step of said degree of depth macro block being encoded according to the minimum coding mode of comparative result selection rate distortion cost:
If judge and said degree of depth macro block do not carried out interframe encode, then only said degree of depth macro block is carried out intraframe coding;
Carry out interframe encode and do not comprise discontinuous motion vector field if judge said degree of depth macro block, then select less rate distortion costs value corresponding interframe encoding mode or intra-frame encoding mode that said degree of depth macro block is encoded according to the comparative result of the first and second rate distortion costs values; And
Carry out interframe encode and comprise discontinuous motion vector field if judge said degree of depth macro block, then select the corresponding interframe encoding mode of minimum rate distortion costs value, intra-frame encoding mode or geometry to divide coding mode said degree of depth macro block is encoded according to the comparative result of first to the 3rd rate distortion costs value.
8. a depth map encoding device is characterized in that, comprising:
Dividing line is set up module, is used to set up a plurality of dividing lines and forms the division set, and wherein, a plurality of dividing lines are used for that degree of depth macro block is carried out wedge shape and divide;
The intraframe coding module is used for intra-frame encoding mode degree of depth macro block being encoded to obtain the first corresponding rate distortion costs value;
The interframe encode judge module is used to judge whether with interframe encoding mode said degree of depth macro block is encoded;
The interframe encode module is used for when said interframe encode judge module judgement is encoded to said degree of depth macro block with interframe encoding mode, with interframe encoding mode degree of depth macro block being encoded to obtain the second corresponding rate distortion costs value;
Divide judge module, be used to judge whether said degree of depth macro block comprises discontinuous motion vector field for how much;
Divide coding module how much; Be used for when said how much division judge modules judge that said degree of depth macro block carries out interframe encode and comprises discontinuous motion vector field; Dividing coding mode with how much encodes to said degree of depth macro block; Wherein, Said how much divide coding modes comprises: from said division set, select the optimal dividing line that said degree of depth macro block is divided obtaining first and second degree of depth subregions according to the monochrome information of all pixels of said degree of depth macro block, and respectively said first and second degree of depth subregions are carried out estimation and predictive coding to obtain the 3rd rate distortion costs value of correspondence; And
Coding mode is selected module, is used for the rate distortion costs value of more said degree of depth macro block under the different coding pattern, with according to the minimum coding mode of comparative result selection rate distortion cost so that said degree of depth macro block is encoded.
9. depth map encoding device according to claim 8 is characterized in that, said partition set is combined into:
G={ξ(ρ
i,θ
i)|i＝1,2,…,L}，
Wherein, ξ (ρ
i, θ
i) be the i bar dividing line in the said dividing line set, ρ
iBe the distance of degree of depth macro block to this dividing line, θ
iBe the angle of this dividing line and first direction, L is the number of dividing line.
10. depth map encoding device according to claim 9 is characterized in that, said degree of depth macro block to the distance of a plurality of dividing lines all be positioned at [0,8) between, the angle of a plurality of dividing lines and first direction all be positioned at [0,2 π) between.
11. depth map encoding device according to claim 8; It is characterized in that; Said how much division judge modules are used for obtaining the brightness value of said all pixels of degree of depth macro block, and calculate the variance of the brightness value of all pixels in the said degree of depth macro block, and the size of more said variance and predetermined threshold value; If said variance, is then judged said degree of depth macro block greater than said predetermined threshold value and is comprised discontinuous motion vector field.
12. depth map encoding device according to claim 8; It is characterized in that; Said how much division coding modules are used for each bar dividing line of said division set said degree of depth macro block being divided respectively; And average brightness value that calculate to divide in two parts of gained all pixels separately respectively is to obtain the corresponding first and the average brightness value of second portion; Respectively the average brightness value of corresponding first of each bar dividing line and second portion is done difference and obtain difference, and the dividing line that obtains the absolute value maximum that makes difference is as said optimal dividing line, so that said degree of depth macro block is divided to obtain first and second degree of depth subregions.
13. depth map encoding device according to claim 8 is characterized in that,
Said intraframe coding module is used for according to the intra-frame encoding mode of H264/MPEG-4 AVC coding standard said degree of depth macro block being carried out intraframe coding, and with the optimum rate distortion costs of correspondence as the said first rate distortion costs value;
Said interframe encode module is used for according to the interframe encoding mode of H264/MPEG-4 AVC coding standard said degree of depth macro block being carried out coded in inter mode, and with the optimum rate distortion costs of correspondence as the said second rate distortion costs value.
14. depth map encoding device according to claim 8; It is characterized in that; Said coding mode selects module to be used for when said degree of depth macro block not being carried out interframe encode; Only select intra-frame encoding mode; When said degree of depth macro block carries out interframe encode and does not comprise discontinuous motion vector field; Select less rate distortion costs value corresponding interframe encoding mode or intra-frame encoding mode that said degree of depth macro block is encoded according to the comparative result of the first and second rate distortion costs values, when said degree of depth macro block carries out interframe encode and comprises discontinuous motion vector field, said degree of depth macro block is encoded according to the corresponding interframe encoding mode of the minimum rate distortion costs value of the comparative result selection of first to the 3rd rate distortion costs value, intra-frame encoding mode or how much division coding modes.
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