CN102752616A - Method for converting double-view three-dimensional video to multi-view three-dimensional video - Google Patents

Method for converting double-view three-dimensional video to multi-view three-dimensional video Download PDF

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CN102752616A
CN102752616A CN201210204472XA CN201210204472A CN102752616A CN 102752616 A CN102752616 A CN 102752616A CN 201210204472X A CN201210204472X A CN 201210204472XA CN 201210204472 A CN201210204472 A CN 201210204472A CN 102752616 A CN102752616 A CN 102752616A
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曾超
程远兵
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Sichuan Changhong Electric Co Ltd
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Abstract

The invention relates to a method for converting a double-view three-dimensional video to a multi-view three-dimensional video. The method comprises the following steps of: firstly, transmitting a pair of three-dimensional images into a buffering area to be processed according to a double-view three-dimensional video sequence; secondly, implementing three-dimensional matching on the double-view three-dimensional image, and calculating the maximum value of positive parallax of the left and right images; thirdly, determining the inserting position of a virtual view point and the parallax offset of adjacent view points, thus obtaining multi-view-point three-dimensional images according to the position of the virtual view point and the parallax offset of the adjacent view points; fourthly, carrying out the first step if the video conversion is not completed, and then carrying out the following step after the view conversion is completed; and fifthly, carrying out post-processing and compressing on the obtained multi-view-point three-dimensional images according to the properties of 3D (Three-dimensional) display with multiple view points. By virtue of the conversion method, the double-view three-dimensional range image can be obtained, and the position for inserting the virtual view point and the parallax information of the adjacent view points can be determined in a self-adaption way, thereby greatly improving the subjective quality and the comfortable degree in the conversion of the double-view three-dimensional video to the multi-view three-dimensional video.

Description

The method of binocular tri-dimensional video conversion multi-eye stereo video
Technical field
The present invention relates to video processing technique, is the method for binocular tri-dimensional video conversion multi-eye stereo video concretely.
Background technology
Compare with the two-dimensional video demonstration, the Stereoscopic Video Presentation of 3D form and people's visual signature mate more, can make people when watching image, more be rich in third dimension and feeling of immersion.At present, stereo display mainly is divided into two kinds of spectacle and bore hole formulas, and wherein eyeglass stereoscopic shows to be main with initiatively fast gate-type and passive polarization type mainly, and the bore hole formula mainly is divided into disparity barrier formula, lens pillar formula etc.The eyeglass stereoscopic technology mainly concentrates on consumer level market, and like stereoscopic TV, stereoprojection etc., bore hole formula stereo technology is because technology and cost factor, at present mainly in the airport, the commercial demonstration and the small size consumption electronic product such as exhibition.Bore hole formula stereo display technique is not because need additional apparatus can let spectators enjoy stereoeffect, thereby received consumer's the generally expectation and the attention of various countries producer, just becoming the developing direction of stereo display of future generation.
Existing large scale bore hole 3D TV is generally multi-view auto stereo display mode, and this just requires video signal source is the multi-viewpoint three-dimensional video.The sequence of a plurality of views that produce when the multi-viewpoint three-dimensional video is meant and same scene is taken in the identical moment by the different a plurality of video cameras in position, the corresponding viewpoint of view.Stereoscopic shooting mainly adopts binocular camera to realize three-dimensional production at present, and this has relatively high expectations to picture pick-up device and camera technique, and existing many both at home and abroad companies release stereo camera and stereocamera product.And also having certain technical bottleneck to multi-view video collection, multi-view point video adopts solid modelling to make or the generation of binocular tri-dimensional video commentaries on classics multi-eye stereo video mode usually at present.Solid modelling mainly is meant the 3-D cartoon making, and this mode cost is more expensive; It is the mode that a kind of similar automatic 2D changes 3D that binocular tri-dimensional video changes the multi-eye stereo video, because viewpoint is come out through the binocular solid virtually drawing, the major defect of this mode is that the multi-eye stereo video of conversion exists distortion.For existing binocular tri-dimensional video can on many viewpoints bore hole 3D TV, be shown, convert binocular tri-dimensional video into a research focus that the multi-eye stereo video has become bore hole 3D Video processing.
Summary of the invention
The invention provides a kind of method of binocular tri-dimensional video conversion multi-eye stereo video; Can be used for the generation of multi-viewpoint three-dimensional video, and satisfy 3D, particularly the broadcast request of bore hole 3D; The multi-viewpoint three-dimensional video image of conversion is changed continuously, thereby let the beholder obtain better three-dimensional experience.
The method of binocular tri-dimensional video conversion multi-eye stereo video of the present invention comprises:
A. obtain the binocular tri-dimensional video content; The binocular tri-dimensional video that obtains decoded obtain the binocular tri-dimensional frequency sequence; And a left side/right image of binocular tri-dimensional video separated; Obtain the single channel attributes of images, and a left side/right a pair of binocular stereo image is sent into buffering area and handled by the order of said binocular tri-dimensional frequency sequence;
B. the binocular stereo image of buffering area is carried out the solid coupling, calculates the parallax relation of a left side/right image, and obtain the corresponding depth map of a left side/right wing image, with a left side/right side wherein one road image be reference, a calculating left side/right image positive parallax maximum;
The parallax relation of a left side/right image that c. calculates according to step b is confirmed the insertion position of virtual view and the parallactic shift amount of adjacent viewpoint;
D. synthesize virtual view through the depth map of a left side/right wing image with correspondence the virtual view position and the side-play amount of adjacent viewpoint confirmed according to step c, obtains multi-viewpoint stereo image;
E. judge whether the conversion of binocular tri-dimensional frequency sequence finishes, if do not finish to get into step a, being through with gets into step f;
F. according to many viewpoints 3D display characteristic, the multi-viewpoint stereo image that obtains is carried out post-processed and compression, be met the multi-viewpoint three-dimensional video that 3D requires.
Method of the present invention be through to about the stereo-picture that separates carry out solid and mate; Can calculate the parallax depth map information of this stereoscopic image; Through view synthetic technology virtual view is generated again, finally obtain the multi-viewpoint three-dimensional video content based on depth map.
Concrete, step a if the binocular tri-dimensional video employing is that connecting method compresses, then calls 2D video decode storehouse and obtains the binocular tri-dimensional frequency sequence when obtaining the binocular tri-dimensional video content, then a left side/right image is separated; If image has resolution loss on level or vertical direction, then the lossy direction of resolution is reduced according to normal the ratio of width to height; To blue light 3D video compression format, call the storehouse of H.264MVC decoding and a left side/right wing image is decoded a left side that obtains separating/right wing image sequence.
Concrete, adopt matching process that this is carried out the solid coupling to image to binocular stereo image in the buffering area among the step b based on the zone.Suppose the pixel (x of left road image 1, y 1), can find the match point (x of this pixel through the solid coupling at the right wing image r, y r), adopt the sub-piece of M * N (M represents the number of pixels of Width, and N represents the number of pixels of short transverse) to carry out the pixel coupling for template.Suppose that left road image is with (x 1, y 1) for the template at center is T, the subimage of coupling right wing image is T ', can calculate the similarity of T and T' through formula:
C ( T , T ′ ) = Σ i = 1 M Σ j = 1 N [ ( T ′ ( i , j ) - T ( i , j ) ) ] 2 Σ i = 1 M Σ j = 1 N [ T ′ ( i , j ) ] 2 Σ i = 1 M Σ j = 1 N [ T ( i , j ) ] 2
Through relatively a left side/right anaglyph is in the coefficient correlation of each position, the maximum value of correlation is exactly an optimal match point, then can try to achieve the pixel (x of left road image 1, y 1) at the match point (x of right wing image r, y r); Calculate after the parallax of each point, parallax value is mapped to from small to large on 0～255 the gray scale, obtain the depth map of a left side/right wing image thus, and depth map is carried out smoothing processing.
Concrete, after the parallactic shift amount of definite adjacent viewpoint, calculate the parallax value between adjacent two-way pixel in a left side/right image among the step c.The maximum of supposing parallactic shift amount definite among the step b is D Max, the final multi-viewpoint three-dimensional video viewpoint number that generates is K, inserts the position of virtual view and can calculate through following formula:
In the inboard virtual view number of inserting of binocular stereo image be:
Figure BDA00001790080800031
Wherein
Figure BDA00001790080800032
rounds symbol under being.
The virtual view number of inserting in the binocular stereo image outside is:
Figure BDA00001790080800033
For guaranteeing each visual angle parallax continuity, the parallax value of calculating between adjacent two-way is:
D = D max K 1 + 1 .
Concrete, be the virtual view position of confirming according to step c and the side-play amount of adjacent viewpoint to the synthetic of virtual view described in the steps d, virtual viewpoint rendering is carried out in the inboard and the outside of binocular stereo image, the generation multi-viewpoint stereo image.
Concrete, the post-processed of telling a story among the step f comprises with compression arranges according to the video sequence order the virtual visual point image and the original binocular stereo image that obtain, adopts the mode of video-splicing that the multi-viewpoint stereo image sequence is compressed.
Preferably, the 3D described in the step f is the bore hole 3D rendering.
Method of the present invention is through carrying out the solid coupling to binocular stereo image; Can access the depth image of binocular solid; Viewpoint number according to pre-converted multi-viewpoint three-dimensional video can also adaptive judgement insert the position of virtual view and the parallax information of adjacent viewpoint simultaneously, has significantly improved subjective quality and comfort level that binocular tri-dimensional video changes the multi-eye stereo video.
Below in conjunction with the embodiment of accompanying drawing illustrated embodiment, foregoing of the present invention is remake further detailed description.But should this be interpreted as that the scope of the above-mentioned theme of the present invention only limits to following instance.Do not breaking away under the above-mentioned technological thought situation of the present invention, various replacements or change according to ordinary skill knowledge and customary means are made all should comprise within the scope of the invention.
Description of drawings
Fig. 1 is the flow chart of the method for binocular tri-dimensional video conversion multi-eye stereo video of the present invention.
Embodiment
The method of binocular tri-dimensional video conversion multi-eye stereo video of the present invention as shown in Figure 1 comprises:
A. obtain the binocular tri-dimensional video content,, then call 2D video decode storehouse and obtain the binocular tri-dimensional frequency sequence if the binocular tri-dimensional video employing is that connecting method compresses; If image has resolution loss on level or vertical direction, then the lossy direction of resolution is reduced according to normal the ratio of width to height; To blue light 3D video compression format, call the storehouse of H.264MVC decoding a left side/right wing image is decoded.The binocular tri-dimensional video that obtains decoded obtain the binocular tri-dimensional frequency sequence; And a left side/right image of binocular tri-dimensional video separated; Obtain the single channel attributes of images, and a left side/right a pair of binocular stereo image is sent into buffering area and handled by the order of said binocular tri-dimensional frequency sequence;
B. adopt matching process that this is carried out the solid coupling to image to binocular stereo image in the buffering area based on the zone; Calculate the parallax relation of a left side/right image; And obtain the corresponding depth map in a left side/right wing image, with a left side/right side wherein one road image be reference, calculate a left side/right image positive parallax maximum.Suppose the pixel (x of left road image 1, y 1), can find the match point (x of this pixel through the solid coupling at the right wing image r, y r), adopting the sub-piece of M * N (M represents the number of pixels of Width, and N represents the number of pixels of short transverse) is that template is carried out the pixel coupling.Suppose that left road image is with (x 1, y 1) for the template at center is T, the subimage of coupling right wing image is T', can calculate the similarity of T and T' through formula:
C ( T , T ′ ) = Σ i = 1 M Σ j = 1 N [ ( T ′ ( i , j ) - T ( i , j ) ) ] 2 Σ i = 1 M Σ j = 1 N [ T ′ ( i , j ) ] 2 Σ i = 1 M Σ j = 1 N [ T ( i , j ) ] 2
Through relatively a left side/right anaglyph is in the coefficient correlation of each position, the maximum value of correlation is exactly an optimal match point, then can try to achieve the pixel (x of left road image 1, y 1) at the match point (x of right wing image r, y r).Be reference for example, then in this image, be positioned at point (x with left road image 1, y 1) size of the corresponding parallax value of the pixel located is:
D(x 1,y 1)=x 1-x r
Work as x 1>x rThe time, parallax D (x 1, y 1) for just, this pixel is the protrusion stereoscopic display screen; Work as x 1<x rThe time, parallax D (x 1, y 1) for negative, this pixel is recessed stereoscopic display screen; Work as x 1=x rThe time, parallax D (x 1, y 1) be zero, this pixel is positioned on the stereoscopic display screen.Calculate after the parallax of each point, parallax value is mapped to from small to large on 0～255 the gray scale, obtain the depth map of a left side/right wing image thus, and depth map is carried out smoothing processing.With left road image is reference, and statistics left and right sides image slices vegetarian refreshments positive parallax maximum is: D Max=max{D (x 1, y 1) ..., D (x h, y v).
The parallax relation of a left side/right image that c. calculates according to step b is confirmed the insertion position of virtual view and the parallactic shift amount of adjacent viewpoint.After the parallactic shift amount of confirming adjacent viewpoint, calculate the parallax value between adjacent two-way pixel in a left side/right image.The maximum of supposing parallactic shift amount definite among the step b is D Max, the final multi-viewpoint three-dimensional video viewpoint number that generates is K, inserts the position of virtual view and can calculate through following formula:
In the inboard virtual view number of inserting of binocular stereo image be:
Figure BDA00001790080800042
Wherein
Figure BDA00001790080800051
rounds symbol under being.
The virtual view number of inserting in the binocular stereo image outside is:
Figure BDA00001790080800052
For guaranteeing each visual angle parallax continuity, the parallax value of calculating between adjacent two-way is:
D = D max K 1 + 1 .
D. the virtual view position and the side-play amount of adjacent viewpoint confirmed according to step c, the virtual view position of confirming according to step c and the side-play amount of adjacent viewpoint are carried out virtual viewpoint rendering to the inboard and the outside of binocular stereo image, the generation multi-viewpoint stereo image;
E. judge whether the conversion of binocular tri-dimensional frequency sequence finishes, if do not finish to get into step a, being through with gets into step f;
F. according to many viewpoints bore hole 3D display characteristic; Virtual visual point image and original binocular stereo image to obtaining are arranged according to the video sequence order; Adopt the mode of video-splicing that the multi-viewpoint stereo image sequence is compressed, be met the multi-viewpoint three-dimensional video that bore hole 3D requires.

Claims (7)

1. binocular tri-dimensional video is changed the method for multi-eye stereo video, it is characterized by to comprise:
A. obtain the binocular tri-dimensional video content; The binocular tri-dimensional video that obtains decoded obtain the binocular tri-dimensional frequency sequence; And a left side/right image of binocular tri-dimensional video separated; Obtain the single channel attributes of images, and a left side/right a pair of binocular stereo image is sent into buffering area and handled by the order of said binocular tri-dimensional frequency sequence;
B. the binocular stereo image of buffering area is carried out the solid coupling, calculates the parallax relation of a left side/right image, and obtain the corresponding depth map of a left side/right wing image, with a left side/right side wherein one road image be reference, a calculating left side/right image positive parallax maximum;
The parallax relation of a left side/right image that c. calculates according to step b is confirmed the insertion position of virtual view and the parallactic shift amount of adjacent viewpoint;
D. synthesize virtual view through the depth map of a left side/right wing image with correspondence the virtual view position and the side-play amount of adjacent viewpoint confirmed according to step c, obtains multi-viewpoint stereo image;
E. judge whether the conversion of binocular tri-dimensional frequency sequence finishes, if do not finish to get into step a, being through with gets into step f;
F. according to many viewpoints 3D display characteristic, the multi-viewpoint stereo image that obtains is carried out post-processed and compression, be met the multi-viewpoint three-dimensional video that 3D requires.
2. the method for binocular tri-dimensional video conversion multi-eye stereo video as claimed in claim 1; It is characterized by: step a is when obtaining the binocular tri-dimensional video content; If what binocular tri-dimensional video adopted is that connecting method compresses; Then call 2D video decode storehouse and obtain the binocular tri-dimensional frequency sequence, then a left side/right image is separated; If image has resolution loss on level or vertical direction, then the lossy direction of resolution is reduced according to normal the ratio of width to height; To blue light 3D video compression format, call the storehouse of H.264MVC decoding and a left side/right wing image is decoded a left side that obtains separating/right wing image sequence.
3. the method for binocular tri-dimensional video conversion multi-eye stereo video as claimed in claim 1; It is characterized by: adopt matching process that this is carried out the solid coupling to image to binocular stereo image in the buffering area among the step b based on the zone; Through relatively a left side/right anaglyph is in the coefficient correlation of each position, the maximum value of correlation is exactly an optimal match point; Calculate after the parallax of each point, parallax value is mapped to from small to large on 0～255 the gray scale, obtain the depth map of a left side/right wing image thus, and depth map is carried out smoothing processing.
4. the method for binocular tri-dimensional video conversion multi-eye stereo video as claimed in claim 1 is characterized by: after confirming the parallactic shift amount of adjacent viewpoint among the step c, calculate the parallax value between adjacent two-way pixel in a left side/right image.
5. the method for binocular tri-dimensional video conversion multi-eye stereo video as claimed in claim 1; It is characterized by: be the virtual view position confirmed according to step c and the side-play amount of adjacent viewpoint to virtual view synthetic described in the steps d; Virtual viewpoint rendering is carried out in the inboard and the outside to binocular stereo image, generates multi-viewpoint stereo image.
6. the method for binocular tri-dimensional video conversion multi-eye stereo video as claimed in claim 1; It is characterized by: the post-processed of telling a story among the step f comprises with compression arranges according to the video sequence order the virtual visual point image and the original binocular stereo image that obtain, adopts the mode of video-splicing that the multi-viewpoint stereo image sequence is compressed.
7. like the method for the described binocular tri-dimensional video conversion of one of claim 1 to 6 multi-eye stereo video, it is characterized by: the 3D described in the step f is the bore hole 3D rendering.
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Application publication date: 20121024