WO2012099352A2 - Dispositif et procédé de codage/décodage d'images à points de vue multiples - Google Patents

Dispositif et procédé de codage/décodage d'images à points de vue multiples Download PDF

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Publication number
WO2012099352A2
WO2012099352A2 PCT/KR2012/000138 KR2012000138W WO2012099352A2 WO 2012099352 A2 WO2012099352 A2 WO 2012099352A2 KR 2012000138 W KR2012000138 W KR 2012000138W WO 2012099352 A2 WO2012099352 A2 WO 2012099352A2
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image
block
real image
encoding
real
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PCT/KR2012/000138
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English (en)
Korean (ko)
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WO2012099352A3 (fr
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이진영
이재준
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삼성전자주식회사
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Priority claimed from KR1020110015948A external-priority patent/KR20120084628A/ko
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Publication of WO2012099352A2 publication Critical patent/WO2012099352A2/fr
Publication of WO2012099352A3 publication Critical patent/WO2012099352A3/fr

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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

Definitions

  • Embodiments of the present invention relate to an apparatus and method for encoding / decoding an image, and more particularly, to an apparatus and method for encoding / decoding an image of a current view using an image that is already encoded / decoded.
  • the stereoscopic image refers to a 3D image that simultaneously provides depth and space information. Unlike stereo images, which provide images of different viewpoints to the left and right eyes, stereoscopic images provide different images according to the viewer's viewpoint. As a result, the stereoscopic image is composed of a plurality of images taken from the observer's point of view.
  • Images taken from a plurality of viewpoints have a large amount of data.
  • images captured from a plurality of viewpoints are encoded by a single-view video encoding method such as MPEG-2 and H.264 / AVC, it is impossible to realize network infrastructure and terrestrial bandwidth.
  • An encoding apparatus includes an image generator for generating a virtual image of a current view to be encoded; And an image encoder which encodes an actual image of a current view using the virtual image.
  • Decoding apparatus includes an image generating unit for generating a virtual image of the current view to be decoded; And an image decoder which decodes an actual image of a current view using the virtual image.
  • An encoding method includes generating a virtual image of a current view to be encoded; And encoding the real image of the current view by using the virtual image.
  • Decoding method comprises the steps of generating a virtual image of the current view to be decoded; And decoding the real image of the current view by using the virtual image.
  • the encoding efficiency of the actual image may be improved by synthesizing the image of the neighboring view, which is already encoded, to generate a virtual image of the current view, and using the virtual image to encode the actual image.
  • the coding efficiency may be improved by changing the coding scheme according to the motion information of the neighboring view.
  • the encoding efficiency may be improved by changing the encoding scheme according to the encoding mode information of the neighboring view.
  • FIG. 1 is a diagram illustrating an encoding device and a decoding device according to an embodiment of the present invention.
  • FIG. 2 is a block diagram illustrating a detailed configuration of an encoding apparatus according to an embodiment of the present invention.
  • FIG. 3 is a block diagram showing a detailed configuration of a decoding apparatus according to an embodiment of the present invention.
  • FIG. 4 is a diagram illustrating a structure of a multiview video according to an embodiment of the present invention.
  • FIG. 5 is a diagram illustrating an example of an image of a neighboring view used to encode an actual image of a current view according to an embodiment of the present invention.
  • FIG. 6 is a diagram illustrating a process of generating a virtual image of a current view using an image of a neighboring view according to an embodiment of the present invention.
  • FIG. 7 illustrates a process of synthesizing an image according to an embodiment of the present invention.
  • FIG. 8 illustrates contour information of a virtual image according to an embodiment of the present invention.
  • FIG. 9 is a diagram illustrating a process of encoding an actual image based on contour information of a virtual image according to one embodiment of the present invention.
  • FIG. 10 is a flowchart illustrating an encoding method according to an embodiment of the present invention.
  • FIG. 1 is a diagram illustrating an encoding device and a decoding device according to an embodiment of the present invention.
  • the encoding apparatus 101 may encode the real image of the current view by using the virtual image of the current view to be encoded.
  • the encoding apparatus 101 may generate a virtual image by synthesizing an image corresponding to a neighboring viewpoint.
  • the virtual image and the real image may include all images, such as a color image, a depth image, a disparity image, and an occlusion image.
  • the depth image refers to an image representing a distance between an object and a viewer in a color image with a value of 0 to 255 (8 bits).
  • synthesis means generating a virtual image of the current view by using the image of the neighboring view that is already encoded.
  • the encoding apparatus 101 may generate a virtual image of another B view by synthesizing an image of an I view, a B view, or a P view that is already encoded.
  • a virtual image of another P view may be generated by synthesizing an image of an I view or a P view that is already encoded.
  • the encoding apparatus 101 may generate virtual images of all views except the I view by using the information of at least one view that is already encoded. The generated virtual image may be utilized when encoding the actual image.
  • the encoding apparatus 101 may encode the real image by replacing the real image with the virtual image of the current view generated from the image of the neighboring view, which is already encoded, without encoding the real image of the current view.
  • the encoding apparatus 101 may encode the real image by partially using the virtual image according to the area of the real image.
  • the encoding apparatus 101 may encode the actual image for each block based on at least one of contour information of the actual image, encoding mode information of the neighboring viewpoint, or motion information of the neighboring viewpoint.
  • the encoding apparatus 101 may extract contour information of an actual image from contour information of a virtual image.
  • the encoding apparatus 101 may encode according to an existing scheme.
  • the encoding apparatus 101 may encode the real image by substituting the virtual image without encoding the real image or by setting a strong encoding level.
  • the encoding apparatus 101 does not have an outline when the encoding mode information of the peripheral view of the actual image is preset encoding mode information (Skip mode, direct mode, intra 16 * 16 mode, inter 16 * 16 mode). It can be processed in the same way as if not. In addition, when the motion information of the neighboring view is relatively small, the encoding apparatus may process the same as when the contour does not exist.
  • decoding apparatus 102 Since the decoding apparatus 102 is almost the same as the operation of the encoding apparatus 101, a detailed description thereof will be omitted.
  • FIG. 2 is a block diagram illustrating a detailed configuration of an encoding apparatus according to an embodiment of the present invention.
  • the encoding apparatus 101 may include an image generator 201 and an image encoder 202.
  • the image generator 201 may generate a virtual image of the current view by synthesizing the images corresponding to the neighboring views of the current view.
  • the current view means a view of the current block to be encoded
  • the neighbor view means a view different from the current view.
  • the image encoder 202 may encode the actual image of the current view by using the virtual image.
  • the image encoder 202 may replace the real image of the current view with a virtual image without directly encoding the image.
  • the image encoder 202 may encode the real image by partially using the virtual image according to the area of the real image.
  • the image encoder 202 may encode the real image using the virtual image partially for each region according to at least one of contour information of the actual image, encoding mode information of the neighboring viewpoint, or motion information of the neighboring viewpoint. .
  • the image encoder 202 may extract contour information of the real image using the virtual image, and encode the real image based on the contour information of the real image.
  • the image encoder 202 may encode the block of the real image based on the motion search and the shift search according to a conventional method. In contrast, when no contour line exists in the block of the real image, the image encoder 202 may skip the encoding process for the block of the real image.
  • the image encoder 202 when the contour is present in the block of the real image, the image encoder 202 may encode the block of the real image with a relatively low quantization coefficient. In contrast, when no contour line exists in the block of the real image, the image encoder 202 may encode the block of the real image with a relatively high quantization coefficient.
  • the image encoder 202 may encode a block of the actual image with a relatively high bit amount. In contrast, when no contour line exists in a block of the real image, the image encoder 202 may encode a block of the real image with a relatively low bit amount.
  • the image encoder 202 may encode the original block size of the actual image.
  • the image encoder 202 may downsample the block of the actual image, reduce the block size to a smaller block size than the original block size, and then encode the same.
  • whether or not the contour exists in the block of the actual image may be determined according to the contour information of the virtual image.
  • Contour information of the virtual image may be determined based on a difference in brightness values of pixels in the virtual image.
  • the contour information of the virtual image may be determined through the contour detector.
  • the encoding apparatus 101 may encode the encoding by varying the strength of the encoding according to whether or not the contour exists in the actual image.
  • the image encoder 202 when the encoding mode information of the peripheral view is the skip mode, the direct mode, the inter 16 * 16 mode, or the intra 16 * 16 mode, the image encoder 202 is as if the outline does not exist. Can be processed. That is, when the encoding mode of the peripheral view is the skip mode, the direct mode, the inter 16 * 16 mode, or the intra 16 * 16 mode, the image encoder 202 increases the coding strength of the real image or the virtual image. Can be replaced with
  • the image encoder 202 may process the same as in the case where no contour line exists. That is, when the motion information of the neighboring view is relatively small, the image encoder 202 may increase the coding strength of the actual image or replace it with a virtual image.
  • the encoding result of the actual image may be transmitted to the decoding apparatus 102 through the bitstream.
  • FIG. 3 is a block diagram showing a detailed configuration of a decoding apparatus according to an embodiment of the present invention.
  • the decoding apparatus 102 may include an image generator 301 and an image decoder 302.
  • the image generator 301 performs the same operation as the image generator 201 described above, a detailed description thereof will be omitted.
  • the image decoder 302 may decode the actual image of the current view using the virtual image. For example, the image decoder 302 may replace the actual image of the current view with a virtual image without directly decoding the image.
  • the image decoder 302 may decode the real image by partially using the virtual image according to the area of the real image.
  • the image decoder 302 may decode the real image using the virtual image partially for each region according to at least one of contour information of the actual image, decoding mode information of the neighboring viewpoint, or motion information of the neighboring viewpoint. .
  • the image decoder 302 may extract the contour information of the real image using the virtual image, and decode the real image based on the contour information of the real image.
  • the image decoder 302 may decode the block of the actual image based on the motion search and the disparity search according to a conventional method without using a virtual image. Can be.
  • the image decoder 302 may decode the block of the real image using the block of the virtual image.
  • the image decoder 302 may decode the block of the actual image with a relatively low quantization coefficient.
  • the image decoder 302 may decode the block of the real image with a relatively high quantization coefficient.
  • the quantization coefficients used by the image decoder 302 correspond to the quantization coefficients used by the image encoder 202.
  • the image decoder 302 may decode the block of the actual image with a relatively high bit amount.
  • the image decoder 302 may decode the block of the actual image with a relatively low bit amount.
  • the image decoder 302 may decode the original block size of the actual image.
  • the image decoder 302 may desample the block of the actual image to a block size smaller than the original block size and then upsample it.
  • the decoding apparatus 102 may decode by varying the strength of decoding depending on whether the contour exists in the actual image.
  • the image decoder 302 when the decoding mode information of the peripheral view is the skip mode, the direct mode, the inter 16 * 16 mode, and the intra 16 * 16 mode, the image decoder 302 is as if the outline does not exist. Can be processed. That is, when the decoding mode of the peripheral view is the skip mode, the direct mode, the inter 16 * 16 mode, the intra 16 * 16 mode, the image decoder 302 increases the decoding strength of the actual image or the virtual image. Can be replaced with
  • the image decoder 302 may process the same as in the case where the contour does not exist. That is, when the motion information of the neighboring view is relatively small, the image decoder 302 may increase the decoding strength of the actual image or replace it with the virtual image.
  • FIG. 4 is a diagram illustrating a structure of a multiview video according to an embodiment of the present invention.
  • a multiview video coding method of encoding GOP (Group of Picture) '8' is shown.
  • GOP Group of Picture
  • a hierarchical B picture is basically applied to a temporal axis and a view axis, thereby reducing redundancy between images.
  • the multiview video encoding apparatus 101 first encodes a left picture (I-view), and then a right picture (P-view) and a center picture (Center).
  • a picture corresponding to three viewpoints can be encoded by sequentially encoding Picture: B-view.
  • the left image may be encoded in such a manner that temporal redundancy is removed by searching for similar regions from previous images through motion estimation.
  • the right image since the right image is encoded by using the previously encoded left image as a reference image, the right image may be encoded in such a manner that temporal redundancy based on motion estimation and view redundancy based on disparity estimation are removed. have.
  • the center image since the center image is encoded by using both the left image and the right image, which are already encoded, as a reference image, the inter-view redundancy may be removed according to the estimation of the shift in both directions.
  • an image encoded without using a reference image of another view may be encoded by predicting and encoding a reference image of another view in one direction, such as an I-View and a right image.
  • An image that is predicted and encoded in both directions, such as a P-View and a center image, is defined as a B-View.
  • Frames of MVC are largely classified into six groups according to the prediction structure.
  • the six groups include an I-view anchor frame for intra coding, an I-view non-anchor frame for inter-time inter-coding, a P-view anchor frame for inter-view unidirectional inter coding, and a unidirectional inter-coding between views.
  • FIG. 5 is a diagram illustrating an example of an image of a neighboring view used to encode an actual image of a current view according to an embodiment of the present invention.
  • the encoding apparatus 101 compresses the current block located in the current frame, which is the current image 501, the reference images 502 and 503 located in time around the current frame and the reference images 504 and 505 located in the periphery in view. Can be used.
  • the encoding apparatus 101 may search a prediction block most similar to the current block in the reference images 502 ⁇ 505 and compress the residual signal between the current block and the prediction block.
  • the compression mode for searching the prediction block using the reference image may include P Slice Only / Direct (B Slice Only), 16x16, 16x8, 8x16, and P8x8 modes.
  • the encoding apparatus 101 may use the Ref1 image 502 and the Ref2 image 503 to search for motion information of the current image 501, and the Ref3 image 504 to search for variation information of the current image 501. ) And the Ref4 image 505 can be used.
  • the encoding apparatus 101 may generate a virtual image of the current view by synthesizing the images of the reference images 504 and 505 corresponding to the neighboring view of the current view.
  • the encoding apparatus 101 may encode the actual image using the contour information of the virtual image.
  • the encoding apparatus 101 may change the encoding scheme according to the contour information of the real image, and the contour information of the real image may be extracted from the contour information of the virtual image.
  • the decoding device 102 may also be performed in substantially the same manner as the encoding device 101.
  • FIG. 6 is a diagram illustrating a process of generating a virtual image of a current view using an image of a neighboring view according to an embodiment of the present invention.
  • the encoding apparatus 101 generates a virtual image 601 at V n , which is the current view, by synthesizing an image 602 of V n-1 , which is a neighboring view, and an image 603 of V n + 1 . Can be. At this time, the image 602 of V n-1 and the image 603 of V n + 1 which are peripheral viewpoints need to be encoded already. If the current view is a B-view, the virtual image 601 of the B-view may be generated by synthesizing the virtual image of the already-coded I-view and the virtual image of the P-view. In this case, camera information may also be utilized when generating the virtual image 601 of the B-view.
  • FIG. 7 illustrates a process of synthesizing an image according to an embodiment of the present invention.
  • the encoding apparatus 101 may generate the virtual image 703 of the current view by synthesizing the images 701 and 702 of the surrounding view.
  • the encoding apparatus 101 may extract contour information from the generated virtual image 703 of the current view.
  • the encoding apparatus 101 may encode the actual image of the current view using the virtual image 703.
  • the encoding apparatus 101 generates a virtual image of the current view by synthesizing the image of the neighboring view, which is already encoded, and uses the virtual image to encode the actual image, thereby encoding the actual image. Can improve.
  • the encoding apparatus 101 may improve encoding efficiency and minimize distortion due to the outline by changing the encoding scheme according to the outline information of the actual image.
  • the encoding apparatus 101 may increase the strength of the encoding in the region where the contour does not exist, without weakening the strength of the encoding in the region where the contour exists in the actual image or by utilizing the virtual image.
  • the contour information of the actual image may be derived from the contour information of the virtual image.
  • FIG. 8 illustrates contour information of a virtual image according to an embodiment of the present invention.
  • a black block is an area not including an outline
  • a white block is an area including an outline.
  • the encoding apparatus 101 may encode a relatively high bit amount for an area including an outline and a relatively low bit amount for an area not including an outline.
  • FIG. 9 is a diagram illustrating a process of encoding an actual image based on contour information of a virtual image according to one embodiment of the present invention.
  • the virtual image 901 and the real image 902 are shown.
  • the virtual image 901 and the real image 902 mean an image of a current view to be encoded.
  • the virtual image 901 is generated by synthesizing an image of a neighboring viewpoint.
  • the virtual image and the real image may include all images, such as a color image, a depth image, a disparity image, and an occlusion image.
  • the encoding apparatus 101 may differently set a coding scheme of the real image 902 based on the contour information of the real image 902.
  • the contour information of the real image 902 may be derived from the contour information of the virtual image 901.
  • block 1 does not include an outline and block 2 means an area including an outline.
  • block 2 means an area including an outline.
  • whether the blocks of the actual image 902 include the contour may be determined according to the contour information of the virtual image 901.
  • the encoding apparatus 101 may encode the first block of the actual image 902 with a relatively low bit amount or may encode the virtual image 901. In addition, the encoding apparatus 101 may encode block 2 of the actual image 902 with a relatively high bit amount or directly encode it according to an existing method without using the virtual image 901.
  • FIG. 10 is a flowchart illustrating an encoding method according to an embodiment of the present invention.
  • the encoding method of FIG. 10 may be equally applied to the decoding method performed by the decoding apparatus.
  • the encoding apparatus 101 may encode an image corresponding to a peripheral view of the current view.
  • the encoding apparatus 101 may generate a virtual image of the current view by synthesizing the image of the neighboring view that is already encoded. For example, the encoding apparatus 101 may generate a virtual image of another B view by synthesizing an image of an I view, a B view, or a P view that is already encoded. In addition, a virtual image of another P view may be generated by synthesizing an image of an I view or a P view that is already encoded. As a result, the encoding apparatus 101 may generate virtual images of all views except the I view by using the information of at least one view that is already encoded. The generated virtual image may be utilized when encoding the actual image.
  • the encoding apparatus 101 may extract the outline from the virtual image.
  • the encoding apparatus 101 may determine an encoding criterion of a block of an actual image.
  • the encoding apparatus 101 may change the encoding scheme in consideration of whether an outline is included in a block of an actual image, whether motion information of a neighboring view is relatively small, and whether the encoding mode of the neighboring view is encoding mode 1.
  • the encoding mode 1 may include a skip mode, a direct mode, an inter 16 * 16 mode, an intra 16 * 16 mode, and the type of the encoding mode 1 may vary according to the configuration of the system.
  • Encoding mode 2 may include other encoding modes except encoding mode 1.
  • the encoding apparatus 101 may substitute a virtual image without directly encoding an actual image. If the block of the actual image does not include an outline, the motion information of the neighboring view is relatively small, or the encoding mode of the neighboring view is the encoding mode 1, in operation S1005, the encoding apparatus 101 may perform the first encoding scheme. According to the real video can be encoded.
  • step S1006 the encoding apparatus 101 according to the second encoding scheme.
  • the actual image can be encoded.
  • the first encoding method means replacing the real video with the virtual video without encoding the real video or encoding the real video with a relatively low bit amount.
  • the second encoding method means encoding an actual video with a relatively high bit amount.
  • Methods according to an embodiment of the present invention can be implemented in the form of program instructions that can be executed by various computer means and recorded in a computer readable medium.
  • the computer readable medium may include program instructions, data files, data structures, etc. alone or in combination.
  • Program instructions recorded on the media may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts.

Abstract

L'invention concerne un dispositif et un procédé de codage/décodage d'images à points de vue multiples. Le dispositif de codage synthétise une image d'un point de vue environnant afin de générer une image virtuelle de la vue actuelle devant être codée, et code une image réelle de la vue actuelle en utilisant l'image virtuelle.
PCT/KR2012/000138 2011-01-20 2012-01-06 Dispositif et procédé de codage/décodage d'images à points de vue multiples WO2012099352A2 (fr)

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US201161434614P 2011-01-20 2011-01-20
US61/434,614 2011-01-20
KR10-2011-0015948 2011-02-23
KR1020110015948A KR20120084628A (ko) 2011-01-20 2011-02-23 다시점 영상 부호화／복호화 장치 및 방법

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WO2017090988A1 (fr) * 2015-11-23 2017-06-01 한국전자통신연구원 Procédé de codage/décodage vidéo à points de vue multiples
US10477247B2 (en) 2015-11-18 2019-11-12 Electronics And Telecommunications Research Institute Method for decoding video using in-loop filter, and device therefor

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US10477247B2 (en) 2015-11-18 2019-11-12 Electronics And Telecommunications Research Institute Method for decoding video using in-loop filter, and device therefor
WO2017090988A1 (fr) * 2015-11-23 2017-06-01 한국전자통신연구원 Procédé de codage/décodage vidéo à points de vue multiples
US10701396B2 (en) 2015-11-23 2020-06-30 Electronics And Telecommunications Research Institute Multi-viewpoint video encoding/decoding method

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