Error concealment apparatus for a compressed video signal processing system
AssigneeRCA Thomson Licensing Corporation
InventorsSheau-Bao Ng, Eric P. Herrmann
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Abstract
Apparatus in a receiver includes error detection circuitry for detecting segments of transmitted encoded image data having non correctable errors. Further apparatus generates error maps for respective frames in the transmitted sequence. Responsive to the data in the error maps, known good image data or interpolated image data is substituted for data corresponding to the segments containing errors. Error indications for anchor frames, from which predictive frames are encoded, are propagated into error maps corresponding to the predictive encoded frames to accommodate error concealment of errors that may propagate into successive dependently encoded frame data.
Claims7
Error concealment apparatus for a video signal processor of the type for decompressing a compressed image representative signal which has been compressed in groups of frames, with at least the first frame in each group of frames having been intraframe encoded, and ones of the remaining frames of each group having been predictive encoded, and wherein frames of respective groups of frames from which other frames have been predictive encoded are herein designated as anchor frames, said compressed image representative signal occurring in segments of data of less than a frame and susceptible of incurring errors during transmission, said segments including error check bits from which errors in segments may be detected, said apparatus comprising:
- receiver means for detecting transmitted said compressed image representative signal and providing a detected compressed image representative signal;
- error detection/correction means, responsive to detected compressed image representative signal, for detecting and correcting correctable errors and detecting further errors which are not correctable and generating error indications E for respective segments of data having uncorrectabe errors;
- means responsive to said error indications E for mapping said uncorrectable errors in an error map for respective frames;
- means for propagating, in said error map, error indications occurring in at least said anchor frames, into corresponding spatial locations of successive anchor frames within a group of frames;
- and
- means responsive to said propagated error indications for providing substitute image data for image data corresponding to said corresponding spatial locations.
A video signal processor of the type for decompressing a compressed image representative signal which has been compressed in groups of frames, with at least the first frame in each group of frames having been intraframe encoded, and ones of the remaining frames of each group having been predictive encoded, and wherein frames of respective groups of frames from which other frames have been predictive encoded are herein designated as anchor frames, said compressed image representative signal occurring in segments of data of less than a frame and susceptible of incurring errors during transmission, said segments including error check bits from which errors in segments may be detected, said apparatus comprising:
- error detection/correction means, responsive to said compressed image representative signal, for detecting errors in respective segments of data which are not correctable and generating error indications E for respective segments of data containing such errors;
- means responsive to said error indications E for mapping said uncorrectable errors in an error map, and propagating error indications E of said anchor frames, into corresponding map locations of successive anchor frames within a group of frames;
- and
- means responsive to said propagated error indications for providing substitute image data for portions of respective frames having errors indicated by the mapped indications E.
Dependencies are inferred from the claim text.