CN102447863A - Multi-viewpoint three-dimensional video subtitle processing method - Google Patents
Multi-viewpoint three-dimensional video subtitle processing method Download PDFInfo
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Abstract
The invention relates to three-dimensional display technologies and in particular relates to a multi-viewpoint three-dimensional video subtitle processing method. A subtitle generating and laminating method for a multi-viewpoint three-dimensional video, disclosed by the invention, comprises the following steps of: obtaining maximum parallax information of subtitle displaying areas at each subtitle displaying moment by analyzing three-dimensional picture pixel matching characteristics of picture subtitle display areas of any one pair of adjacent viewpoints of multiple view points, and inserting a subtitle into a three-dimensional video so as to be encoded together. The multi-viewpoint three-dimensional video subtitle processing method disclosed by the invention has the beneficial effects of greatly improving the subjective quality and comfortableness of the subtitle of the multi-viewpoint three-dimensional video and enabling audiences to have better subtitle effect experience during watching the multi-viewpoint three-dimensional video, and is suitable for processing the subtitle of the multi-viewpoint three-dimensional video.
Description
Technical field
The present invention relates to stereo display technique, relate to a kind of multi-viewpoint three-dimensional video caption processing method specifically.
Background technology
Compare with the two-dimensional video demonstration, Stereoscopic Video Presentation and people's visual signature matees more, makes people when watching image, be rich in third dimension and feeling of immersion.At present, stereoscopic TV 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.
Be generally multi-view auto stereo display mode for large-sized bore hole stereoscopic TV, this just requires video signal source is multi-view point video.The sequence of a plurality of views that produce when multi-view point 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, 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.
Because the captions processing of multi-viewpoint three-dimensional video is all different with planar video and binocular tri-dimensional video captions processing method, existing three-dimensional playback equipment is not supported common subtitle file toward contact.To the captions processing method of multi-viewpoint three-dimensional video, also there are not unified standards and norms at present.If the method that adopts manual mode to insert transparent captions picture in the multi-viewpoint three-dimensional video sequence is successively carried out the stack of three-dimensional captions, the very huge and depth perception of workload is difficult for adjustment and tests.Therefore, in the contents of making high-quality multi-viewpoint three-dimensional video, how caption information being handled is the research focus that the bore hole stereo content is made.
Summary of the invention
This reality invention technical problem to be solved is; A kind of multi-viewpoint three-dimensional video caption processing method is proposed; The captions that are used for the multi-viewpoint three-dimensional video generate and stack, improve the captions display quality, make the beholder in watching the multi-viewpoint three-dimensional video, have better captions effect and experience.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: a kind of multi-viewpoint three-dimensional video caption processing method, it is characterized in that, and may further comprise the steps:
A. write down multi-viewpoint three-dimensional video viewpoint number, obtain the resolution of single channel video image in the multi-viewpoint three-dimensional video, confirm the position of captions viewing area, guarantee that caption information can show in this zone fully;
B. read the multi-viewpoint three-dimensional video content, obtain the vision signal of any a pair of adjacent viewpoint;
C. read in subtitle file, obtain the temporal information of captions demonstration each time, the first sub-picture of adjacent left and right sides road viewpoint corresponding when each captions are shown is put into buffering area with to be analyzed;
D. stereo-picture pixel coupling is carried out in the captions viewing area, obtain the maximum disparity information of adjacent left and right sides road image, confirm to insert the parallax data of each viewpoint captions of multi-viewpoint three-dimensional video;
E. read in subtitle file, carry out the stack of captions, captions are compressed among the multi-viewpoint three-dimensional video content according to the parallax data of each viewpoint captions;
F. the time zone that shows according to captions in the subtitle file continues to insert three-dimensional caption information and encodes with the multi-viewpoint three-dimensional video content, when running into new subtitle file, returns step c.
Further, step f also comprises: when detecting all caption informations demonstration end, still must encode to follow-up uncoded multi-viewpoint three-dimensional video content.
Concrete, the multi-viewpoint stereo image of said multi-viewpoint three-dimensional video content for having spliced, then step a also comprises: each visual point image of multi-viewpoint three-dimensional video is separated.
More specifically, among the said step a, in the process of obtaining single channel video image resolution, there is the image of resolution loss to carry out resolution recovery, obtains the full resolution image sequence of one-channel signal for level or vertical direction.
Further, among the said step b, multi-viewpoint three-dimensional captions viewing area is the rectangular area, below of multi-viewpoint three-dimensional video content picture.
Concrete, in the steps d, stereo-picture pixel coupling being carried out in the captions viewing area, the concrete grammar that obtains the maximum disparity information of adjacent left and right sides road visual point image is: the horizontal pixel width of supposing this captions viewing area is M, then can this zone be divided into
The sub-piece of individual NxN; The coordinate of supposing the top left corner pixel point of certain the NxN piece in the image of left road is (x
i, y
i), after mating with adjacent right viewpoint stereo-picture pixel, the coordinate of the top left corner pixel point of corresponding right wing images match piece does
Note
If d is for just, then this sub-piece is positioned at outside the stereoscopic display screen, if d for negative, then this sub-piece is positioned at stereoscopic display screen;
Successively each sub-piece of image captions viewing area, left road is carried out stereo-picture coupling, writes down the maximum dmax of difference of abscissa of the top left corner pixel point of left way piece and adjacent right wing match block thereof, suppose that the viewpoint number of multi-viewpoint three-dimensional video is n, then have:
When dmax＞0, the parallax data of adjacent viewpoint captions is:
Ds=(1+k) dmax, wherein the value of k is between 0.10～0.15;
With the most left road video in the multi-viewpoint three-dimensional video is reference, and then the parallax data of i road video and the most left road caption information is from left to right:
ds＝(i-1)(1+k)dmax，(i≤n)；
When dmax≤0, then three-dimensional captions can not block the image information in original multi-viewpoint three-dimensional video, get ds＞0 and get final product.
More specifically; Among the step e; The concrete grammar that carries out subtitle superposition according to the parallax data of three-dimensional captions is: with the direct overlapping text information of left road viewpoint video image in the multi-viewpoint three-dimensional video content; The caption information horizontal offset is for according to the maximum disparity spacing of the adjacent left and right sides road visual point image that calculates in the steps d in the right wing viewpoint video image, left and right sides road caption information is added to encodes in the multi-viewpoint three-dimensional video content.
Beneficial effect of the present invention does; Multi-viewpoint stereo image through to caption area matees; The depth perception characteristics of multi-viewpoint three-dimensional video sequence have been considered; Avoid occurring the problem that image blocks captions in the stereoscopic picture plane, the caption information parallax of the adjacent left and right sides of the adaptive judgement of this method road visual point image simultaneously can significantly improve the subjective quality and the comfort level of multi-viewpoint three-dimensional video caption.
Description of drawings
Fig. 1 is a method flow diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing invention done further explanation:
The present invention proposes a kind of adaptive multi-viewpoint three-dimensional video caption processing method; The captions that can be used for the multi-eye stereo video generate and stack; This method shows the stereo-picture pixel matching characteristic that passes through to analyze any a pair of adjacent viewpoint image captions viewing area in many viewpoints constantly at each captions, obtains the maximum disparity information of captions viewing area.For avoiding captions viewing area neutral body picture to block the caption information of stack as much as possible; This method makes the beholder can in watching multi-viewpoint three-dimensional display mode process, obtain better three-dimensional captions experience effect according to the captions parallax information of multi-viewpoint three-dimensional video adjacent viewpoint picture characteristics adaptive judgement multi-view image.
Of Fig. 1, scheme of the present invention realizes through following steps:
A. write down multi-viewpoint three-dimensional video viewpoint number, obtain the resolution of single channel video image in the multi-viewpoint three-dimensional video, confirm the position of captions viewing area, guarantee that caption information can show in this zone fully, get into step b;
In the signal of left and right sides road, to add caption information different with binocular tri-dimensional video; Each viewpoint of multi-viewpoint three-dimensional video all need be added corresponding subtitle information, can calculate the caption information position of inserting in the signal of every road through record multi-view point video viewpoint number and subsequent step.If the multi-viewpoint three-dimensional video splices by common multi-view stereo image; Must carry out lock out operation to each visual point image,, can directly obtain the resolution of single channel video image for the multi-viewpoint three-dimensional video that separates; Simultaneously for the single channel vision signal; In level or vertical direction resolution loss is arranged like image, need the lossy direction of resolution is reduced according to normal the ratio of width to height, obtain the full resolution image sequence of one-channel signal;
When selecting the caption information insertion position; Be divided into and be inserted in the former video pictures caption information and the outer two kinds of situations of picture; When wherein being inserted into three-dimensional caption information outside original video pictures; Caption information needn't directly be added among original multi-viewpoint three-dimensional video content, and can not occurring caption information in this case, to block the situation so the implementation method of stereoscopic picture plane comparatively simple, and the present invention mainly considers caption information is inserted into the situation in original video pictures.Common two-dimensional video caption information is usually located at the video pictures lower zone;, the multi-viewpoint three-dimensional video caption also can subtitle position be placed on the video pictures lower zone when handling; Confirm that the rectangular area is the viewing area of three-dimensional captions, this zone must guarantee the demonstration fully of three-dimensional caption information;
B. read the multi-viewpoint three-dimensional video content, obtain the vision signal of any a pair of adjacent viewpoint, get into step c;
Because synchronization different points of view image has very strong correlation, therefore choose the depth of field relation that any a pair of adjacent viewpoint can reflect different objects in the picture basically;
C. read in subtitle file, obtain the temporal information of captions demonstration each time, the first sub-picture of adjacent left and right sides road viewpoint corresponding when each captions are shown is put into buffering area with to be analyzed, gets into steps d;
D. stereo-picture pixel coupling is carried out in the captions viewing area, obtain the maximum disparity information of adjacent left and right sides road image, confirm to insert the parallax data of each viewpoint captions of multi-viewpoint three-dimensional video, get into step e;
Concrete grammar is: the brightness of supposing left road image captions viewing area interior pixel point C (k, 1) is I
l(k, l), the brightness of corresponding this pixel of right wing image C (k, 1) be Ir (k, l).Adopt NxN piece to carry out the pixel coupling, adopt mean absolute error MAD (Meanabsolute deviation) criterion to mate.Wherein,
Adopt full-search algorithm to search for, consider the parallax distance of the adjacent right and left eyes of common multi-viewpoint three-dimensional video, getting N usually is 3, and search radius is chosen for 64.The horizontal pixel width of supposing this caption area is M, then can this zone be divided into the sub-piece of
individual NxN.Suppose that certain horizontal coordinate is x on the image NxN piece of left road
i, after mating with adjacent right viewpoint stereo-picture pixel, the coordinate of corresponding right wing images match piece does
Note
If d is being for just, then this sub-piece is positioned at stereoscopic display screen outer (because the left and right sides image sequence of three-dimensional video-frequency does not form standard as yet, for just, this block is positioned at stereoscopic display screen and is as the criterion with d in the present invention) outward, if d is for bearing, then this sub-piece is positioned at stereoscopic display screen.
Successively each sub-piece of image captions viewing area, left road is carried out stereo-picture coupling, write down the maximum dmax of difference of the horizontal coordinate of left way piece and adjacent right wing match block thereof, suppose that the viewpoint number of multi-viewpoint three-dimensional video is n, then have
When dmax＞0, the parallax spacing of adjacent viewpoint caption information is:
Ds=(1+k) dmax, wherein the k value is between 0.10～0.15,
With the most left road video in the multi-viewpoint three-dimensional video is reference, and then i road video can calculate by following formula with the parallax distance of the most left road caption information from left to right:
ds＝(i-1)(1+k)dmax (i≤n)
When dmax≤0, then three-dimensional captions can not block the image information in original multi-viewpoint three-dimensional video, get ds＞0 and get final product;
E. read in subtitle file, carry out the stack of captions, captions are compressed among the multi-viewpoint three-dimensional video content, get into step f according to the parallax data of each viewpoint captions;
Concrete stacking method is: the left road viewpoint video image two-dimentional caption information that directly superposes; In the right wing viewpoint video image two-dimentional caption information horizontal offset according to calculate in the steps d with the three-dimensional captions parallax of the most left road visual point image spacing, caption information is added to encodes in the existing multi-viewpoint three-dimensional video;
F. the time zone that shows according to captions in the subtitle file continues to insert three-dimensional caption information and encodes with the multi-viewpoint three-dimensional video content; The overlapping text method is consistent with step e with video-frequency compression method; When running into new subtitle file; Return step c, as detect all caption informations and show when finishing, still must encode follow-up uncoded binocular tri-dimensional video content images.
The present invention adopts said method; Multi-viewpoint stereo image through to caption area matees; The depth perception characteristics of multi-viewpoint three-dimensional video sequence have been considered more; Avoid the problem that image blocks captions in the stereoscopic picture plane, can significantly improve the subjective quality and the comfort level of multi-viewpoint three-dimensional video caption.
Claims (7)
1. a multi-viewpoint three-dimensional video caption processing method is characterized in that, may further comprise the steps:
A. write down multi-viewpoint three-dimensional video viewpoint number, obtain the resolution of single channel video image in the multi-viewpoint three-dimensional video, confirm the position of captions viewing area, guarantee that caption information can show in this zone fully;
B. read the multi-viewpoint three-dimensional video content, obtain the vision signal of any a pair of adjacent viewpoint;
C. read in subtitle file, obtain the temporal information of captions demonstration each time, the first sub-picture of adjacent left and right sides road viewpoint corresponding when each captions are shown is put into buffering area with to be analyzed;
D. stereo-picture pixel coupling is carried out in the captions viewing area, obtain the maximum disparity information of adjacent left and right sides road image, confirm to insert the parallax data of each viewpoint captions of multi-viewpoint three-dimensional video;
E. read in subtitle file, carry out the stack of captions, captions are compressed among the multi-viewpoint three-dimensional video content according to the parallax data of each viewpoint captions;
F. the time zone that shows according to captions in the subtitle file continues to insert three-dimensional caption information and encodes with the multi-viewpoint three-dimensional video content, when running into new subtitle file, returns step c.
2. a kind of multi-viewpoint three-dimensional video caption processing method according to claim 1 is characterized in that step f also comprises: when detecting all caption informations demonstration end, still must encode to follow-up uncoded multi-viewpoint three-dimensional video content.
3. a kind of multi-viewpoint three-dimensional video caption processing method according to claim 1; It is characterized in that; The multi-viewpoint stereo image of said multi-viewpoint three-dimensional video content for splicing, then step a also comprises: each visual point image of multi-viewpoint three-dimensional video is separated.
4. according to any described a kind of multi-viewpoint three-dimensional video caption processing method of claim 1-3; It is characterized in that; Among the said step a; In the process of obtaining single channel video image resolution, there is the image of resolution loss to carry out resolution recovery for level or vertical direction, obtain the full resolution image sequence of one-channel signal.
5. a kind of multi-viewpoint three-dimensional video caption processing method according to claim 4 is characterized in that, among the step b, multi-viewpoint three-dimensional captions viewing area is the rectangular area, below of multi-viewpoint three-dimensional video content picture.
6. a kind of multi-viewpoint three-dimensional video caption processing method according to claim 5; It is characterized in that; In the steps d; Stereo-picture pixel coupling is carried out in the captions viewing area, and the concrete grammar that obtains the maximum disparity information of adjacent left and right sides road visual point image is: the horizontal pixel width of supposing this captions viewing area is M, then can this zone be divided into
The sub-piece of individual NxN; The coordinate of supposing the top left corner pixel point of certain the NxN piece in the image of left road is (x
i, y
i), after mating with adjacent right viewpoint stereo-picture pixel, the coordinate of the top left corner pixel point of corresponding right wing images match piece does
Note
If d is for just, then this sub-piece is positioned at outside the stereoscopic display screen, if d for negative, then this sub-piece is positioned at stereoscopic display screen;
Successively each sub-piece of image captions viewing area, left road is carried out stereo-picture coupling, writes down the maximum dmax of difference of abscissa of the top left corner pixel point of left way piece and adjacent right wing match block thereof, suppose that the viewpoint number of multi-viewpoint three-dimensional video is n, then have:
When dmax＞0, the parallax data of adjacent viewpoint captions is:
Ds=(1+k) dmax, wherein the value of k is between 0.10～0.15;
With the most left road video in the multi-viewpoint three-dimensional video is reference, and then the parallax data of i road video and the most left road caption information is from left to right:
ds＝(i-1)(1+k)dmax，(i≤n)；
When dmax≤0, then three-dimensional captions can not block the image information in original multi-viewpoint three-dimensional video, get ds＞0 and get final product.
7. a kind of multi-viewpoint three-dimensional video caption processing method according to claim 6; It is characterized in that; Among the step e; The concrete grammar that carries out subtitle superposition according to the parallax data of three-dimensional captions is: with the direct overlapping text information of left road viewpoint video image in the multi-viewpoint three-dimensional video content; The caption information horizontal offset is for according to the maximum disparity spacing of the adjacent left and right sides road visual point image that calculates in the steps d in the right wing viewpoint video image, left and right sides road caption information is added to encodes in the multi-viewpoint three-dimensional video content.
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Application publication date: 20120509 |