# US 11,310,532 B2 · Method and device for reconstructing image data from decoded image data > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,310,532 B2 - Document ID: US11310532B2 - Status: Granted - Kind: B2 - Application number: 15/868,111 - Filed: 2018-01-11 - Published: 2018-08-30 - Granted: 2022-04-19 - Earliest claimed: 2018-01-11 - Assignees: InterDigital VC Holdings, Inc. - Applicants: Interdigital Vc Holdings, Inc. - Inventors: Pierre Andrivon; David Touze; Nicolas Caramelli - Web page: https://patentgrep.com/patent/US11310532B2 ## CPC - H04N 19/65: using error resilience - G06T 5/50: using two or more images, e.g. averaging or subtraction - G06T 5/92: based on global image properties - G06T 9/00: Image coding (bandwidth or redundancy reduction for static pictures H04N1/41; coding or decoding of static colour picture signals H04N1/64; methods or arrangements for coding, decoding, compressing or decompressing digital video signals H04N19/00) - H04N 19/184: the unit being bits, e.g. of the compressed video stream - H04N 19/186: the unit being a colour or a chrominance component - H04N 19/20: using video object coding - H04N 19/30: using hierarchical techniques, e.g. scalability (H04N19/63 takes precedence) - H04N 19/44: Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder - H04N 19/46: Embedding additional information in the video signal during the compression process (H04N19/517, H04N19/68, H04N19/70 take precedence) - H04N 19/98: Adaptive-dynamic-range coding [ADRC] - G06T 2207/20208: High dynamic range [HDR] image processing - H04N 19/70: characterised by syntax aspects related to video coding, e.g. related to compression standards - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL ## 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. ## Claims ### Claim 1 A method for reconstructing image data representative of original image data from decoded image data and parameters obtained from a bitstream, the parameters having been processed from the original image data, wherein the method comprises: in response to a determination that a graphic is to be overlaid on a decoded image: selecting a recovery mode according to information data indicating how the parameters have been processed; recovering the parameters by applying the selected recovery mode; and reconstructing image data based on the decoded image data and the recovered parameters, comprising at least inverse mapping of luminance of the decoded image data and chroma correcting of the decoded image data; wherein the decoded image data and the reconstructed image data have different dynamic ranges. ### Claim 2 A device for reconstructing image data representative of original image data from decoded image data and parameters obtained from a bitstream, the parameters having been processed from the original image data, wherein the decoded image data and the reconstructed image data have different dynamic ranges and wherein the device comprises: at least one processor; and at least one memory having stored instructions operative, when executed by the at least one processor, to cause the device to, in response to a determination that a graphic is to be overlaid on a decoded image: select a recovery mode according to an information data indicating how the parameters have been processed; recover the parameters by applying the selected recovery mode; and reconstruct image data based on the decoded image data and the recovered parameters, comprising at least inverse mapping of luminance of the decoded image data and chroma correcting of the decoded image data; wherein the decoded image data and the reconstructed image data have different dynamic ranges. ### Claim 3 (depends on 1) The method of claim 1, wherein the information data is explicitly signaled by a syntax element in a bitstream. ### Claim 4 (depends on 1) The method of claim 1, wherein the information data is implicitly signaled. ### Claim 5 (depends on 1) The method of claim 1, wherein the information data identifies the processing that is applied to the original image data to process the parameters. ### Claim 6 (depends on 1) The method of claim 1, wherein selecting the recovery mode comprises selecting a recovery mode based on at least one characteristic of the original image data or of a mastering display used to grade the original image data, or at least one characteristic of the reconstructed image data or of a target display. ### Claim 7 A non-transitory computer-readable storage medium having stored instructions that, when executed by a processor, cause the processor to reconstruct image data representative of original image data from decoded image data and parameters obtained from a bitstream, the parameters having been processed from the original image data, by: in response to a determination that a graphic is to be overlaid on a decoded image: selecting a recovery mode according to information data indicating how the parameters have been processed; recovering the parameters by applying the selected recovery mode; and reconstructing image data based on the decoded image data and the recovered parameters, comprising at least inverse mapping of luminance of the decoded image data and chroma correcting of the decoded image data; wherein the decoded image data and the reconstructed image data have different dynamic ranges. ### Claim 8 (depends on 2) The device of claim 2, wherein the information data is explicitly signaled by a syntax element in a bitstream. ### Claim 9 (depends on 2) The device of claim 2, wherein the information data is implicitly signaled. ### Claim 10 (depends on 2) The device of claim 2, wherein the information data identifies the processing that is applied to the original image data to process the parameters. ### Claim 11 (depends on 2) The device of claim 2, wherein selecting the recovery mode comprises selecting a recovery mode based on at least one characteristic of the original image data or of a mastering display used to grade the original image data, or at least one characteristic of the reconstructed image data or of a target display.