Abstract: A method and device for reconstructing image data is provided that is representative of an original image data from a decoded image data and parameters obtained from a bitstream, the parameters having been processed from said original image data. The method provides a desaturating of a luma component, an inverse-mapping of desaturated luma component and a correction of chroma components. These operations are being modulated according to the value of a single modulation factor mod representative of a peak luminance of a presentation display on which the reconstructed image is intended to be displayed, a peak luminance of a particular range image and a peak luminance of the original image data or the mastering display used to grade the original image data.

Abstract: A method and an apparatus for encoding a video into a bitstream carrying windows processing coordinates for locally post-processing a video is presented. Such a method comprises:—encoding at least one picture of said video into a bitstream (301),—encoding (302) at least one Supplemental Enhancement Information nesting message, wherein encoding said at least one Supplemental Enhancement Information nesting message comprises:—encoding (303) at least one set of parameters representative of a location of a region in said picture,—encoding (304) at least one Supplemental Enhancement Information message, wherein said at least one Supplemental Enhancement Information message encodes processing information for processing pixels comprised in said region of said picture.

Abstract: The present disclosure generally relates to a method and device for encoding a frame. The method includes the steps of determining a backlight frame from the frame, calculating a residual frame responsive to the frame and the backlight frame, and predictive-encoding of the residual frame using a predictor of the residual frame calculated from an imposed frame (IMF), where the imposed frame is a low-dynamic version of the frame to be encoded. The disclosure relates also a method and device for decoding at least one bitstream representing a frame.

Abstract: A method is described for reconstructing a current block of a current image from at least one block of a reconstructed reference image at a different size from the size of the current image. The method comprises the steps: motion compensate the reference block with at least one interpolation filter that depends on the size of said reference image and on the size of said current image, decode, for the current block, a residue block, and reconstruct the current block from the residue block and from the motion compensated reference block.

Abstract: A method, device, computer program product and a processor readable medium is provided for signaling, in a bitstream representing a LDR picture obtained from an HDR picture. In one embodiment, both a picture/video format of a decoded version of the LDR picture, denoted an output LDR format, and a picture/video format of a decoded version of the HDR picture, denoted an output HDR format is provided. In one embodiment, the method includes encoding in the bitstream a second syntax element which is distinct from the first syntax element and which defines the output HDR format.

Abstract: The present disclosure generally relates to a method and device of converting a HDR version of a picture to a SDR version of this picture. The method is characterized in that it converts the HDR version to the SDR version of the picture according to: a first indicator that indicates the presence of color mapping parameters; a second indicator that indicates whether a device is configured to convert the HDR version to the SDR version of the picture by taking into account said color mapping parameters; and a third indicator that indicates whether converting without taking into account said color mapping parameters is inhibited.

Abstract: A method for encoding a LUT defined as a lattice of vertices is disclosed. At least one value is of each vertex of the lattice. The method comprises for a current vertex: predicting the at least one value of said current vertex from another value which is for example obtained from reconstructed values of neighboring vertices; and encoding in a bitstream at least one residue computed between the at least one value of the current vertex and its prediction in a bitstream.

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: The present disclosure generally relates to a method and device of encoding a High Dynamic Range (HDR) color picture and at least one first Standard Dynamic Range (SDR) color picture, said method comprising encoding (101) a second Standard Dynamic Range (SDR) color picture obtained from the HDR color picture; According to the present disclosure, said method further comprises determining (102) at least one piece of color remapping information, from said second Standard Dynamic Range (SDR) color picture to said at least one first Standard Dynamic Range (SDR) color picture, said at least one piece of color remapping information being used to obtain an approximation of said at least one first Standard Dynamic Range (SDR) color picture from said second Standard Dynamic Range (SDR) color picture.

Abstract: The present disclosure relates to a method and device for adapting a video content decoded from elementary streams to the characteristics of a display from at least one type of metadata giving information regarding said elementary streams. Such a method comprises:—obtaining (102) an additional information (HDR DESCR.) indicating the presence of one particular type of metadata;—determining if said video content decoded from elementary streams is display-able on said display (11) from said additional information (HDR DESCR.) and the characteristics of the display (EDID); and—if said video content decoded from elementary streams is determined as being displayable, selecting (105) a process from said additional information and the characteristics of the display and adapting (106) the video content according to the selected process.

Abstract: The present disclosure generally relates to a method and device of converting a high-dynamic-range (HDR) version of a picture to a standard-dynamic-range (SDR) version of this picture. The method is characterized in that it converts the high-dynamic-range version to the standard-dynamic-range version of the picture according to: a first indicator (I1) that indicates the presence of color mapping parameters; a second indicator (I2) that indicates whether a device is configured to convert the high-dynamic-range version to the standard-dynamic-range version of the picture by taking into account said color mapping parameters; and a third indicator (I3) that indicates whether converting without taking into account said color mapping parameters is inhibited.

Abstract: A method for encoding a LUT defined as a lattice of vertices is disclosed. At least one value is of each vertex of the lattice. The method comprises for a current vertex: predicting the at least one value of said current vertex from another value which is for example obtained from reconstructed values of neighboring vertices; and encoding in a bitstream at least one residue computed between the at least one value of the current vertex and its prediction in a bitstream.

Abstract: Inducing a particular behavior/process among a set of pre-determined behaviors/processes by implicitly signaling the selection of the particular behavior/process though a particular combination of specific values of said set of information data driven the process. Typically, enables re-using parameters already carried with a signal to signal how those parameters are used by a specific process.

Abstract: A method for encoding a colour transform is disclosed that comprises encoding first parameters representative of video signal characteristics of colour output decoded pictures remapped by said at least one color transform and encoding second parameters representative of said at least one colour transform.

Abstract: A method for decoding a video stream representative of a sequence of pictures is disclosed that obtains at least a first color component and a second color component of a picture unit, decodes at least one parameter of a post-processing of the second component, the at least one parameter being defined as a function of the first color component, applies the at least one post-processing to the second color component of the picture unit responsive to the at least one decoded parameter, where the value of the at least one decoded parameter is responsive to the first color component. Corresponding decoding device, encoding method and device, non-transitory computer readable medium are also disclosed.

Abstract: Synchronization of two video streams that have been processed in different ways is achieved by generation of logical maps representative of characteristics, such as differences, between sample values and their spatial neighbors in a current stream and in a reference stream. For samples in a current stream and co-located samples in the reference stream, logical maps are generated. Those frames in each stream that have the best fit regarding equal logical map values are aligned to synchronize the streams.

Abstract: A method or device for reconstructing image data representative of original image data from decoded image data and parameters obtained from a bitstream is described. The parameters having been processed from the original image data. The method includes checking if parameters are lost, corrupted or not aligned with the decoded image data whose graphics or overlay is added to, when at least one of the parameters is lost, corrupted or not aligned with the decoded image data whose graphics or overlay is added to; selecting a recovery mode according to an information data indicating how the parameters have been processed; and recovering the at least one lost, corrupted or not aligned parameter by applying the selected recovery mode, the reconstruction of image data then taking also into account the recovered parameters.

Abstract: The present invention relates to a method for encoding a color transform. The method includes encoding first parameters representative of video signal characteristics of color output decoded pictures remapped by at least one color transform; and encoding second parameters representative of the at least one color transform.

Abstract: A method is disclosed that comprises: obtaining (S10) a video from a stream; obtaining (S12) information representative of one version of color mapping information; determining (S14) a color mapping information responsive to said information representative of one version; and color mapping (S16) the decoded video with said determined color mapping information.

Abstract: The present disclosure generally relates to a method for signaling, in a bitstream representing a LDR picture and an illumination picture both obtained from an HDR picture, both a picture/video format of a decoded version of said LDR picture, called an output LDR format, and a picture/video format of a decoded version of said HDR picture, called an output HDR format, the method comprising encoding in the bitstream a first syntax element defining the output LDR format. The method is characterized in that it further comprises encoding in the bitstream a second syntax element which is distinct from the first syntax element and which defines the output HDR format. The disclosure further relates to an encoding/decoding method/device, a computer program product, a processor readable medium, a non-transitory storage medium and a signal.