CN106162139B - Coding method, video output device, coding/decoding method and video play device - Google Patents
Coding method, video output device, coding/decoding method and video play device Download PDFInfo
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- CN106162139B CN106162139B CN201610630020.6A CN201610630020A CN106162139B CN 106162139 B CN106162139 B CN 106162139B CN 201610630020 A CN201610630020 A CN 201610630020A CN 106162139 B CN106162139 B CN 106162139B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
- H04N19/597—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding specially adapted for multi-view video sequence encoding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/10—Processing, recording or transmission of stereoscopic or multi-view image signals
- H04N13/106—Processing image signals
- H04N13/122—Improving the 3D impression of stereoscopic images by modifying image signal contents, e.g. by filtering or adding monoscopic depth cues
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/10—Processing, recording or transmission of stereoscopic or multi-view image signals
- H04N13/106—Processing image signals
- H04N13/161—Encoding, multiplexing or demultiplexing different image signal components
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/20—Image signal generators
- H04N13/275—Image signal generators from 3D object models, e.g. computer-generated stereoscopic image signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/30—Image reproducers
- H04N13/388—Volumetric displays, i.e. systems where the image is built up from picture elements distributed through a volume
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Abstract
The invention provides a kind of coding method, video output device, coding/decoding method and video play device, reduces the data redundancy in compression algorithm.The coding method comprises the following steps；A polyhedral model is provided, the polyhedral model is spliced to form by two bottom surfaces identical pyramid bottom surface is opposed；By the spherical picture in spherical video to projecting on the face of the polyhedral model, each sprite of self-forming one on each face；The sprite in polyhedral each face is spliced into a Flat-picture.
Description
Technical field
The present invention relates to multimedia technology field, more particularly to a kind of method that coding is planarized to spherical video,
Video output device, the video to planarization coding carry out the method and video play device of sphere decoding.
Background technology
Virtual reality technology is a kind of computer simulation system that can be created with the experiencing virtual world.It can present virtual
The 3 D video file of real effect is the important component of virtual reality technology, and this document can be in virtual reality device
In, such as virtual reality glasses, three-dimensional panoramic vision effect is shown to user.But current transmission of video agreement can only be transmitted
Planar graph, therefore need the video for being translated into plane form literary when transmitting 3 D video file to virtual reality device
Part can transmit.
Common transform mode of the prior art has two kinds, and a kind of is the transform mode using original sphere model, another
Kind is projected using square.
It is the schematic diagram changed in the prior art using original sphere model to 3 D video file shown in Figure 1A.Figure
It is the plan after being changed using above-mentioned model to the stereoscopic picture plane in the 3 D video file of the earth shown in 1B.Right side square
The height of shape is the half of spheroid circumference, isometric with the hemisphere arc of the arctic to the South Pole；Length is then the circumference of the spheroid,
The rectangle on right side is wrapped up onto left side spheroid, can be with all standing.Therefore original area is that spherome surface accumulates 4 π r2, and equidistant column
It is the π of rectangular area 2 after projection2r2, the former divided by the latter, valid data only have 63.66%, and redundant data is a lot.
It is the schematic diagram changed in the prior art using square projection model to 3 D video file shown in Fig. 2A.
It is that the stereoscopic picture plane in the 3 D video file of sea floor world is changed and spelled using above-mentioned model shown in accompanying drawing 2B and 2C
Plan after connecing.Hexahedron is 0.25 π per one side2r2, the hexahedron length of side is 0.5 π r, the i.e. a quarter of circumference.Six faces
The body expansion gross area is 1.5 π2r2, 2 π are projected equivalent to equidistant column2r275%.
The shortcomings that prior art, is substantial amounts of redundant data be present.Spherical coding at utmost ensures image quality, but
There is data redundancy.And hexahedron coding reduces redundancy, compression ratio is the 75% of spherical coding, but it is superfluous to still suffer from substantial amounts of data
It is remaining.
The content of the invention
The technical problem to be solved by the invention is to provide a kind of coding method, video output device, coding/decoding method, with
And video play device, reduce the data redundancy in compression algorithm.
In order to solve the above problems, the invention provides a kind of method that coding is planarized to spherical video, including
Following steps；A polyhedral model is provided, the polyhedral model is by the opposed splicing structure in two bottom surfaces identical pyramid bottom surface
Into；By the spherical picture in spherical video to projecting on the face of the polyhedral model, each of self-forming one is drawn on each face
Face；The sprite in polyhedral each face is spliced into a Flat-picture.
Optionally, it is described by the spherical picture in spherical video on the face of the polyhedral model the step of projection
Polyhedral center overlaps with the centre of sphere of the spherical video；The bottom surface of pyramid in the polyhedral model with it is described spherical
The spherical equatorial plane of video overlaps.
Optionally, the pyramid is identical；The pyramid is orthopyramid；Described two pyramids are rectangular pyramid.
Present invention also offers a kind of video output device, including：Modeling unit, for establishing a polyhedral model, institute
Polyhedral model is stated to be spliced to form by two bottom surfaces identical pyramid bottom surface is opposed；Converting unit, for by spherical video
Spherical picture to projecting on the face of the polyhedral model, each sprite of self-forming one on each face；Concatenation unit, it is used for
The sprite in polyhedral each face is spliced into a Flat-picture.
Present invention also offers a kind of method that video to planarization coding carries out sphere decoding, comprise the following steps；
By the Flat-picture received according to default splicing sequential concatenation into a polyhedral model, the polyhedral model is by two
Bottom surface identical pyramid bottom surface is opposed to be spliced to form；By the Flat-picture being recorded on the polyhedral model on a spheroid
Projection, form a spherical picture.
Optionally, it is described by the Flat-picture being recorded on the polyhedral model on a spheroid the step of projection
Polyhedral center overlaps with the centre of sphere of the spheroid；The bottom surface of pyramid in the polyhedral model and the ball of the spheroid
The shape equatorial plane overlaps.
Optionally, the pyramid is identical；The pyramid is orthopyramid；Described two pyramids are rectangular pyramid.
Present invention also offers a kind of video play device, including：Decoding unit, for the Flat-picture that will be received
According to default splicing sequential concatenation into a polyhedral model, the polyhedral model is by two bottom surfaces identical pyramid bottom surface
It is opposed to be spliced to form；Reduction unit, for by the Flat-picture being recorded on the polyhedral model to projecting on a spheroid, shape
Into a spherical picture.
The present invention does plane projection as polyhedral model using the opposed pyramid in bottom surface to spherical video pictures, reduces
Data redundancy in conversion process and then improve data transmission efficiency.
Brief description of the drawings
It is the schematic diagram changed in the prior art using original sphere model to 3 D video file shown in Figure 1A；Figure
It is to be changed in the prior art using the stereoscopic picture plane in accompanying drawing 1A institutes representation model over the ground the 3 D video file of ball shown in 1B
Plan afterwards.
It is the schematic diagram changed in the prior art using square projection model to 3 D video file shown in Fig. 2A；
It is in the prior art using accompanying drawing 2A institute's representation models to the solid in the 3 D video file of sea floor world shown in accompanying drawing 2B and 2C
Picture is changed and spliced plan.
It is the step for the method for being planarized coding described in the embodiment of the invention to spherical video shown in accompanying drawing 3
Rapid schematic diagram.
It is the schematic shapes of polyhedral model used by the embodiment of the invention shown in accompanying drawing 4.
It is that the embodiment of the invention uses polyhedral model shown in accompanying drawing 4 in spherical video shown in accompanying drawing 5
The schematic diagram that spherical picture is projected.
It is the schematic diagram after eight sprites of polyhedral model shown in accompanying drawing 4 tile shown in accompanying drawing 6A；Shown in accompanying drawing 6B
It is the schematic diagram that accompanying drawing 6A is spliced to form to a seamless rectangle plane picture again；It is to use accompanying drawing 6A shown in Fig. 6 C
The seamless rectangle plane that the spherical picture actual to a width is changed and formed after being spliced with accompanying drawing 6B connecting method is drawn
The design sketch in face.
It is the schematic diagram after six sprites of the embodiment of the invention tile shown in accompanying drawing 7A, corresponding to Rhizoma Sparganii
Cone；It is the schematic diagram that accompanying drawing 7A is spliced to form to a seamless rectangle plane picture again shown in accompanying drawing 7B；Accompanying drawing 7C
Shown is that two identical but highly different pyramids of bottom surface are spliced to form into a seamless rectangle plane picture again
Schematic diagram.
It is the structural representation of video output device described in the embodiment of the invention shown in accompanying drawing 8.
It is that the video of pair planarization coding described in the embodiment of the invention carries out the side of sphere decoding shown in accompanying drawing 9
The step schematic diagram of method.
It is the structural representation of video play device described in the embodiment of the invention shown in accompanying drawing 10.
Embodiment
Below in conjunction with the accompanying drawings to coding method provided by the invention, video output device, coding/decoding method and video playback
The embodiment of device elaborates.
It is the step for the method for being planarized coding described in the embodiment of the invention to spherical video shown in accompanying drawing 3
Rapid schematic diagram, including：Step S30 a, there is provided polyhedral model, the polyhedral model is by two bottom surfaces identical pyramid bottom
Face is opposed to be spliced to form；Step S31, by the spherical picture in spherical video to projecting on the face of the polyhedral model, every
Each sprite of self-forming one on individual face；Step S32, the sprite in polyhedral each face is spliced into a Flat-picture.
With reference to step S30, there is provided a polyhedral model, the polyhedral model is by two bottom surfaces identical pyramid bottom surface
It is opposed to be spliced to form.In this embodiment, the polyhedral model is with bottom surface pair by two positive rectangular pyramids of identical
What the mode put was spliced to form.It is the schematic shapes of polyhedral model used by present embodiment shown in accompanying drawing 4.
In other embodiments, the pyramid can also be triangular pyramid, pentagonal pyramid and the pyramid with other seamed edge numbers
Body, its form are also not necessarily limited to orthopyramid, and the height of two pyramids can also be identical or different.It is at most clear that seamed edge number is got over
Degree is higher, but projection therewith and stitching algorithm are also more complicated.The non-orthopyramid pyramid different with height, its different zones have
Different definition, hot spot region can be protruded, but stitching algorithm complexity can be increased.The advantages of using orthopyramid is can be with
It is relatively easy to each sprite of pyramid is seamless spliced rectangular.
With reference to step S31, by the spherical picture in spherical video to projecting on the face of the polyhedral model, in each face
Upper each sprite of self-forming one.It is that the spherical picture in spherical video is thrown using above-mentioned polyhedral model shown in accompanying drawing 5
The schematic diagram of shadow.Because the first person of user is located at spherical center, and main viewing areas be generally concentrated at it is red
On road face, therefore preferred polyhedral center overlaps with the centre of sphere of the spherical video in this step, and further preferably
The bottom surface of pyramid in the polyhedral model overlaps with the spherical equatorial plane of the spherical video.In eight faces, each face
The length of side beDeveloped area isCompression ratio is relative to spherical coding (etc. corner post shape project)About
For 43%, this result is better than square projection model.
With reference to step S32, the sprite in polyhedral each face is spliced into a Flat-picture.It is shown in accompanying drawing 6A
Schematic diagram after eight sprites tiling of polyhedral model shown in accompanying drawing 4, the corresponding coding in each face；It is shown in accompanying drawing 6B
Two kinds of schematic diagrames that accompanying drawing 6A is spliced to form to a seamless rectangle plane picture again, two ways offset by half
The distance of subgraph.The splicing order of wherein each sprite is not limited to the order shown in accompanying drawing 6B, can be according to any one
Default order arrangement.Write due to existing transmission of video agreement both for rectangular frame, therefore splice rectangular picture
The advantages of face is being capable of compatible existing transmission of video agreement.Connecting method above is symmetrical, that is to say, that left
The connecting method of four sprites of four, side sprite and the right is identical, therefore above-mentioned connecting method is applied to all seamed edges
Number is the orthopyramid of even number.It is the seamless square that the spherical picture actual to a width is changed and formed after being spliced shown in Fig. 6 C
The design sketch of shape Flat-picture.
In other embodiments, for the orthopyramid that seamed edge number is odd number, following splicing can also be used
Mode.It is the schematic diagram after six sprite tilings shown in accompanying drawing 7A, corresponding to triangular pyramid；It is to enter accompanying drawing 7A shown in accompanying drawing 7B
Row is spliced to form the schematic diagram of a seamless rectangle plane picture again.For the orthopyramid that seamed edge number is odd number, can tear open
Separate hexad sprite using aforesaid way to splice, remaining splices by the way of shown in accompanying drawing 6A and 6B.Cause
This, the pyramid of any seamed edge number, can be spliced into a width rectangle plane picture.And for the embodiment of orthopyramid,
Spliced rectangular frame is seamless, therefore is preferred embodiment.
Identical for bottom surface but highly different two pyramids are, it is necessary to upper and lower two pyramids are combined into rectangle respectively, then up and down
Merge.Need to spin upside down part sprite in splicing, can just be spliced into a secondary rectangle plane picture, such as
It is that two identical but highly different pyramids of bottom surface are spliced to form into a seamless rectangle plane again to draw shown in Fig. 7 C
The schematic diagram in face.
It is the structural representation of video output device described in the embodiment of the invention shown in accompanying drawing 8, including：Modeling
Unit 80, for establishing a polyhedral model, the polyhedral model is by the opposed splicing in two bottom surfaces identical pyramid bottom surface
Form；Converting unit 81, for by the spherical picture in spherical video to projecting on the face of the polyhedral model, in each face
Upper each sprite of self-forming one；Concatenation unit 82, for the sprite in polyhedral each face to be spliced into a plane picture
Face.The pyramid is preferably two positive rectangular pyramids of height identical.It is preferred that polyhedral center and the spherical video
The centre of sphere overlap, and the bottom surface of the pyramid further preferably in the polyhedral model and the spherical equator of the spherical video
Face overlaps.
It is that the video of pair planarization coding described in the embodiment of the invention carries out the side of sphere decoding shown in accompanying drawing 9
The step schematic diagram of method, including：Step S90, by the Flat-picture received according to the default sequential concatenation that splices into more than one
Face body Model, the polyhedral model are spliced to form by two bottom surfaces identical pyramid bottom surface is opposed；Step S91, it will record
Flat-picture on the polyhedral model forms a spherical picture to projecting on a spheroid.
In step S90, the predetermined splicing order refer to accompanying drawing 6A and 6B, and the splicing described in 7A, 7B and 7C
Mode, the connecting method of decoding must be carried out in strict accordance with the backward of the connecting method.The pyramid is preferably two height
The positive rectangular pyramid of identical.
In step S91, preferably described polyhedral center overlaps with the centre of sphere of the spherical video, and further preferred institute
The bottom surface for stating the pyramid in polyhedral model overlaps with the spherical equatorial plane of the spherical video
It is the structural representation of video play device described in the embodiment of the invention shown in accompanying drawing 10, including：Solution
Code unit 100 is described more for the Flat-picture that will receive according to default splicing sequential concatenation into a polyhedral model
Face body Model is spliced to form by two bottom surfaces identical pyramid bottom surface is opposed；Reduction unit 101 is described more for that will be recorded in
Flat-picture on the body Model of face forms a spherical picture to projecting on a spheroid.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
Member, under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be regarded as
Protection scope of the present invention.
Claims (14)
- A kind of 1. method that coding is planarized to spherical video, it is characterised in that comprise the following steps；A polyhedral model is provided, the polyhedral model is spliced to form by two bottom surfaces identical pyramid bottom surface is opposed；By the spherical picture in spherical video to projecting on the face of the polyhedral model, each of self-forming one is drawn on each face Face；The sprite in polyhedral each face is spliced into a Flat-picture.
- 2. the method according to claim 1 that coding is planarized to spherical video, it is characterised in thatBy the spherical picture in spherical video on the face of the polyhedral model the step of projection, polyhedral center Overlapped with the centre of sphere of the spherical video.
- 3. the method according to claim 1 or 2 that coding is planarized to spherical video, it is characterised in that described more The bottom surface of pyramid in the body Model of face overlaps with the spherical equatorial plane of the spherical video.
- 4. the method according to claim 1 that coding is planarized to spherical video, it is characterised in thatDescribed two pyramids are identical.
- 5. the method that coding is planarized to spherical video according to claim 1 or 4, it is characterised in that the rib Cone is orthopyramid.
- 6. the method that coding is planarized to spherical video according to claim 1 or 4, it is characterised in that described two Individual pyramid is rectangular pyramid.
- A kind of 7. video output device, it is characterised in that including：Modeling unit, for establishing a polyhedral model, the polyhedral model is by two bottom surfaces identical pyramid bottom surface pair Put and be spliced to form；Converting unit, for by the spherical picture in spherical video to projecting on the face of the polyhedral model,Each sprite of self-forming one on each face；Concatenation unit, for the sprite in polyhedral each face to be spliced into a Flat-picture.
- 8. a kind of method that video to planarization coding carries out sphere decoding, it is characterised in that comprise the following steps；By the Flat-picture received according to default splicing sequential concatenation into a polyhedral model, the polyhedral model by Two bottom surfaces identical pyramid bottom surface is opposed to be spliced to form；By the Flat-picture being recorded on the polyhedral model to projecting on a spheroid, a spherical picture is formed.
- 9. the method that the video according to claim 8 to planarization coding carries out sphere decoding, it is characterised in that will remember Record in the Flat-picture on the polyhedral model into the step of projection on a spheroid,Polyhedral center overlaps with the centre of sphere of the spheroid.
- 10. the method that sphere decoding is carried out to the video of planarization coding according to claim 8 or claim 9, it is characterised in that The bottom surface of pyramid in the polyhedral model overlaps with the spherical equatorial plane of the spheroid.
- 11. the method that the video according to claim 8 to planarization coding carries out sphere decoding, it is characterised in that institute It is identical to state two pyramids.
- 12. the method for carrying out sphere decoding to the video of planarization coding according to claim 8 or 11, its feature exist In the pyramid is orthopyramid.
- 13. the method for carrying out sphere decoding to the video of planarization coding according to claim 8 or 11, its feature exist In described two pyramids are rectangular pyramid.
- A kind of 14. video play device, it is characterised in that including：Decoding unit, for the Flat-picture that will receive according to default splicing sequential concatenation into a polyhedral model, institute Polyhedral model is stated to be spliced to form by two bottom surfaces identical pyramid bottom surface is opposed；Reduction unit, for by the Flat-picture being recorded on the polyhedral model to projecting on a spheroid,Form a spherical picture.
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| US20180075576A1 (en) * | 2016-09-09 | 2018-03-15 | Mediatek Inc. | Packing projected omnidirectional videos |
| CN108111851B (en) * | 2016-11-25 | 2020-12-22 | 华为技术有限公司 | Deblocking filtering method and terminal |
| US10573076B2 (en) | 2016-12-14 | 2020-02-25 | Mediatek Inc. | Method and apparatus for generating and encoding projection-based frame with 360-degree content represented by rectangular projection faces packed in viewport-based cube projection layout |
| BR112019007282A2 (en) * | 2016-12-14 | 2019-07-09 | Mediatek Inc | method and apparatus for 360-degree projection-based frame generation and coding represented by rectangular projection faces packaged in viewport-based cube projection layout |
| US10999602B2 (en) * | 2016-12-23 | 2021-05-04 | Apple Inc. | Sphere projected motion estimation/compensation and mode decision |
| KR102503342B1 (en) * | 2017-01-10 | 2023-02-28 | 삼성전자주식회사 | Method and apparatus for transmitting stereoscopic video content |
| US11057643B2 (en) * | 2017-03-13 | 2021-07-06 | Mediatek Inc. | Method and apparatus for generating and encoding projection-based frame that includes at least one padding region and at least one projection face packed in 360-degree virtual reality projection layout |
| US11004173B2 (en) | 2017-03-13 | 2021-05-11 | Mediatek Inc. | Method for processing projection-based frame that includes at least one projection face packed in 360-degree virtual reality projection layout |
| GB2573951A (en) | 2017-04-05 | 2019-11-20 | Mediatek Inc | Method and apparatus for processing projection-based frame with at least one projection face generated using non-uniform mapping |
| CN108520232B (en) * | 2017-08-16 | 2020-07-24 | 威盛电子股份有限公司 | Method and device for generating three-dimensional panoramic film |
| CN111034191A (en) * | 2017-08-18 | 2020-04-17 | 联发科技股份有限公司 | Method and apparatus for reducing artifacts in projection-based frames |
| CN109906468B (en) * | 2017-09-27 | 2023-08-22 | 联发科技股份有限公司 | Method for processing a projection-based frame comprising at least one projection surface encapsulated in a 360 degree virtual reality projection layout |
| CN107864370A (en) * | 2017-11-14 | 2018-03-30 | 暴风集团股份有限公司 | A kind of spherical panoramic image processing method, device, server and system |
| CN108040260B (en) * | 2017-12-13 | 2020-09-18 | 江苏视博云信息技术有限公司 | Watching method, system and server of high-definition panoramic video under C/S architecture |
| US10922783B2 (en) * | 2018-03-02 | 2021-02-16 | Mediatek Inc. | Cube-based projection method that applies different mapping functions to different square projection faces, different axes, and/or different locations of axis |
| CN108307166A (en) * | 2018-03-09 | 2018-07-20 | 嘀拍信息科技南通有限公司 | A kind of new panoramic video transmission projection model |
| US11095912B2 (en) * | 2019-10-28 | 2021-08-17 | Mediatek Inc. | Video decoding method for decoding part of bitstream to generate projection-based frame with constrained guard band size, constrained projection face size, and/or constrained picture size |
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| JP5745435B2 (en) * | 2012-02-01 | 2015-07-08 | 東芝プラントシステム株式会社 | 3D data processing apparatus, 3D data processing program, and 3D data processing method |
| CN105245838A (en) * | 2015-09-29 | 2016-01-13 | 成都虚拟世界科技有限公司 | Panoramic video playing method and player |
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