公开(公告)号：WO2018130473A1

公开(公告)日：2018-07-19

申请号：PCT/EP2018/050295

申请日：2018-01-05

Applicant: THOMSON LICENSING

Inventor： LELEANNEC, Fabrice ,  GALPIN, Franck ,  POIRIER, Tangi

IPC: H04N19/176 ,  H04N19/122 ,  H04N19/157 ,  H04N19/61

Abstract: A coding unit having a size multiple of three in horizontal or vertical direction is coded through one of several embodiments. In one embodiment, for some block sizes, the coding unit is coded and decoded systematically through SKIP mode. In another embodiment, the coding units can be coded in SKIP mode or with a DC coefficient. In another embodiment, an asymmetric division of a common coding unit parent is performed and transform coefficients are factorized among at least two sub-blocks to encode a coding unit. In another embodiment, a separable two dimensional transform can be applied by applying a transform over the block in one direction, and using two one- dimensional transforms on sub-blocks in the other direction to code. Methods, apparatus, and signal embodiments are provided for encoding and decoding.

公开(公告)号：WO2018130472A1

公开(公告)日：2018-07-19

申请号：PCT/EP2018/050294

申请日：2018-01-05

Applicant: THOMSON LICENSING

Inventor： POIRIER, Tangi ,  GALPIN, Franck ,  LELEANNEC, Fabrice

IPC: H04N19/176 ,  H04N19/119 ,  H04N19/136

Abstract: A block of video data is split and coded using existing transform sizes through one of several embodiments. In one embodiment, the block is split in alternate dimensions, depending on the block size. In another embodiment, the video block can be coded after splitting the block into at least two rectangular sub-blocks using horizontal or vertical divisions. Successive divisions using asymmetric splitting are forbidden if an equivalent split can be attained using only symmetrical splitting, and only one succession of divisions is permitted when there are other successions of asymmetric splitting that result in the identical sub-blocks. In another embodiment, a video block is split using successive splits, but the second type of split is dependent on the first type of split. Methods, apparatus, and signal embodiments are provided for encoding and decoding.

公开(公告)号：WO2018130470A1

公开(公告)日：2018-07-19

申请号：PCT/EP2018/050292

申请日：2018-01-05

Applicant: THOMSON LICENSING

Inventor： BORDES, Philippe ,  RACAPE, Fabien ,  GALPIN, Franck

IPC: H04N19/70 ,  H04N19/192 ,  H04N19/82

CPC classification number: H04N19/82 ,  H04N19/192 ,  H04N19/70

Abstract: Sample Adaptive Offset (SAO) can be used for artifact reduction in video coding. In a multi-pass SAO filtering approach, the output filtered samples of a previous SAO pass become input to the current SAO pass. Information for SAO in a current pass can be inferred depending on the information of SAO in one or more previous passes, and thus signaling of some information may be omitted in the current pass to save bits. In one embodiment, when SAO filtering is turned off for a color component in the previous pass, the SAO filtering is also turned off for the color component in the current pass. In addition, signaling of SAO syntax elements may be omitted when the SAO filtering is turned off in the current pass in order to save bits.

公开(公告)号：WO2018060358A1

公开(公告)日：2018-04-05

申请号：PCT/EP2017/074672

申请日：2017-09-28

Applicant: THOMSON LICENSING

Inventor： RACAPE, Fabien ,  GALPIN, Franck ,  BORDES, Philippe

IPC: H04N19/597 ,  H04N19/593 ,  H04N19/51 ,  H04N19/61 ,  H04N19/147 ,  H04N19/46 ,  H04N19/11 ,  H04N19/174 ,  G06T9/00 ,  G06T15/00

Abstract: In omnidirectional videos, a straight line in the rendering space may no longer appear as a straight line in the frame to be encoded, due to the projection between the encoding space and the rendering space. To adapt to the geometry of omnidirectional videos, intra prediction is performed along non-straight curves. In particular, references samples in neighboring reconstructed blocks of a current block are copied along non-straight curves to form a predicted block for the current block. The non-straight curves may be computed online based on a single intra prediction directional mode for the current block. The parameters of non-straight curves may be based on the mapping used in forming the omnidirectional videos, and the location/size of the current block. The non-straight curves may be obtained using a look-up table or an analytical function that is dependent on the location and size of the current block.

Abstract translation: 在全向视频中，由于编码空间和渲染空间之间的投影，渲染空间中的直线可能不再在要编码的帧中显现为直线。 为了适应全向视频的几何形状，帧内预测是沿非直线曲线进行的。 具体而言，当前块的相邻重构块中的参考样本沿着非直线曲线被复制以形成当前块的预测块。 可以基于当前块的单个帧内预测定向模式在线计算非直线曲线。 非直线曲线的参数可以基于用于形成全向视频的映射以及当前块的位置/大小。 非直线曲线可以使用查找表或取决于当前块的位置和大小的分析函数来获得。

公开(公告)号：WO2017194312A3

公开(公告)日：2017-11-16

申请号：PCT/EP2017/059967

申请日：2017-04-26

Applicant: THOMSON LICENSING

Inventor： GALPIN, Franck ,  RACAPE, Fabien ,  BORDES, Philippe

IPC: H04N19/70 ,  H04N19/117 ,  H04N19/463 ,  H04N19/136 ,  H04N19/182 ,  H04N19/82 ,  H04N19/86

Abstract: Clipping may be applied during various operations at an encoder or decoder. The lower and upper bounds for clipping can be differentially encoded with respect to predictors. Fixed predictors can be used, for example, 0 and 2 bitdepth for the lower and upper bounds, respectively. Adaptive predictors can also be used. Adaptive predictors can be derived from clipping bounds in previously encoded or decoded pictures, or explicitly signaled in a bitstream. Whether to encode the clipping bounds can be determined based on the number of pixels that have values close to the clipping bounds. Additionally, taking advantage of the clipping operation, the prediction residuals can be smoothed, while the distortion for the block may not necessarily increase.

Abstract translation: 剪辑可以在编码器或解码器的各种操作期间应用。 削波的下限和上限可以相对于预测变量进行差分编码。 可以使用固定的预测变量，例如分别为0和2 bitdepth作为下限和上限。 自适应预测器也可以使用。 自适应预测器可以从先前编码或解码图片中的削波边界导出，或者在比特流中显式发送信号。 是否对剪裁边界进行编码可以基于具有接近剪裁边界的值的像素的数量来确定。 另外，利用削波操作，预测残差可以被平滑，而块的失真可能不一定会增加。

公开(公告)号：WO2017162594A1

公开(公告)日：2017-09-28

申请号：PCT/EP2017/056570

申请日：2017-03-20

Applicant: THOMSON LICENSING

Inventor： DOYEN, Didier ,  GALPIN, Franck ,  THIEBAUD, Sylvain

IPC: H04N13/00

Abstract: The disclosure relates to a method for obtaining a modified multi-view content from an original multi-view content, said method being characterized in that it comprises: - determining (20), from a disparity-related map, a separation line separating adjacent first and second image regions, comprising at least one line portion each separating adjacent first and second image portions belonging respectively to the first image region and the second image region and such that a disparity-related value difference between the first and the second image portion is higher than a disparity- related value difference threshold; - obtaining (40) a modified multi-view content by blurring a visual discomfort area that is an area of the second image region, which extends from the separation line over a given distance.

Abstract translation: 本公开涉及用于从原始多视图内容获得修改后的多视图内容的方法，所述方法的特征在于其包括： - 根据视差相关性确定（20） 分离相邻的第一图像区域和第二图像区域的分隔线，所述分隔线包括至少一个线条部分，所述至少一个线条部分分别分离属于所述第一图像区域和所述第二图像区域的相邻的第一图像部分和第二图像部分，并且使得所述 第一和第二图像部分高于视差相关值差阈值; - 通过模糊作为从分隔线延伸给定距离的第二图像区域的区域的视觉不适区域来获得（40）经修改的多视图内容。

公开(公告)号：WO2017137311A1

公开(公告)日：2017-08-17

申请号：PCT/EP2017/052316

申请日：2017-02-03

Applicant: THOMSON LICENSING

Inventor： URBAN, Fabrice ,  GALPIN, Franck ,  POIRIER, Tangi ,  LELEANNEC, Fabrice

IPC: H04N19/176 ,  H04N19/70 ,  H04N19/119 ,  H04N19/147 ,  H04N19/186

CPC classification number: H04N19/119 ,  H04N19/147 ,  H04N19/176 ,  H04N19/186 ,  H04N19/70

Abstract: The present principles relates to a method for encoding an image unit comprising image data represented by a luminance channel and at least one chrominance channel, the method comprising obtaining a luma coding-tree by splitting a luminance unit representative of the luminance channel of said image unit and obtaining a chroma coding-tree by splitting a chrominance unit representative of at least one chrominance channel of said image unit. The method is characterized in that obtaining said chroma coding-tree comprises: - determining whether said chroma coding-tree and said luma coding-tree are identical; and - signaling an information data indicating whether said chroma coding-tree and said luma coding-tree are identical.

Abstract translation: 本原理涉及一种用于对包括由亮度通道和至少一个色度通道表示的图像数据的图像单元进行编码的方法，所述方法包括通过将亮度单元代表 通过分割代表所述图像单元的至少一个色度通道的色度单元来获得色度编码树。 该方法的特征在于获得所述色度编码树包括： - 确定所述色度编码树和所述亮度编码树是否相同; 以及 - 用信号发送指示所述色度编码树和所述明度编码树是否相同的信息数据。

公开(公告)号：WO2017108815A1

公开(公告)日：2017-06-29

申请号：PCT/EP2016/081962

申请日：2016-12-20

Applicant: THOMSON LICENSING

Inventor： BORDES, Philippe ,  GALPIN, Franck ,  ANDRIVON, Pierre

IPC: H04N19/172 ,  H04N19/132 ,  H04N19/156 ,  H04N19/43 ,  H04N19/53

CPC classification number: H04N19/132 ,  H04N19/156 ,  H04N19/172 ,  H04N19/428 ,  H04N19/43 ,  H04N19/53

Abstract: Images to be used as reference images in an adaptive resolution coder or decoder undergo resizing to match the resolution of an image being processed. The resizing process is carried out using extended resolution bit lengths to more accurately represent the processed image. The internal bit depth is retained through the resizing process, and kept as a reference image is stored. When a reference image is used in motion compensation processing, the resized reference matches the resolution of a current image being processed and has an expanded bit depth precision to achieve better fidelity.

Abstract translation: 要在自适应分辨率编码器或解码器中用作参考图像的图像经历调整大小以匹配正在处理的图像的分辨率。 调整大小过程是使用扩展的分辨率位长来执行的，以更准确地表示处理后的图像。 内部比特深度在调整大小过程中保留，并保存为参考图像。 在运动补偿处理中使用参考图像时，调整大小的参考与正在处理的当前图像的分辨率相匹配，并且具有扩展的比特深度精度以实现更好的保真度。

公开(公告)号：WO2018130471A1

公开(公告)日：2018-07-19

申请号：PCT/EP2018/050293

申请日：2018-01-05

Applicant: THOMSON LICENSING

Inventor： BORDES, Philippe ,  RACAPE, Fabien ,  GALPIN, Franck

IPC: H04N19/70 ,  H04N19/117 ,  H04N19/463 ,  H04N19/186 ,  H04N19/82

CPC classification number: H04N19/70 ,  H04N19/117 ,  H04N19/154 ,  H04N19/176 ,  H04N19/186 ,  H04N19/463 ,  H04N19/82

Abstract: In multi-pass SAO filtering, the output filtered samples of a previous SAO pass become input to the current SAO pass. We observe that different SAO passes demonstrate different statistics. Therefore, we propose to use different syntax structures for different passes. In one embodiment, in the first pass, we still use sao_type_idx_luma and sao_type_idx _chroma flags to indicate the SAO types for luma and chroma components, respectively, and in the subsequent passes, we propose to use an additional flag to indicate whether the SAO filtering is turned off for both luma and chroma components. Also, instead of coding syntax element sao_type_idx_chroma itself, we may code (sao_type_idx_chroma – 1) at the encoder side and add "1" back at the decoder side, when both sao_type_idx_off and sao_type_idx_luma are zero.

公开(公告)号：WO2018095890A1

公开(公告)日：2018-05-31

申请号：PCT/EP2017/079867

申请日：2017-11-21

Applicant: THOMSON LICENSING

Inventor： GALPIN, Franck ,  LELEANNEC, Fabrice ,  RACAPE, Fabien ,  POIRIER, Tangi ,  VIELLARD, Thierry ,  URBAN, Fabrice

IPC: H04N19/124 ,  H04N19/176 ,  H04N19/154 ,  H04N19/192

Abstract: Methods and apparatuses for encoding and decoding video are disclosed. The method of encoding video includes assigning (12) a distortion versus quantization curve to a block in a picture of a video based on a perceptual metric classification of the block, determining a quantization parameter (132) for the block based on the distortion versus quantization curve and a target distortion for the block, the target distortion being an overall target distortion for the picture and encoding (16) the block based on the quantization parameter. A bitstream formatted to include encoded data, and computer-readable storage mediums and computer- readable program products for encoding and decoding video are also disclosed.