Patent ID: 6512795
Filing Date: 2003-01-28
Classification: G06T,H04N

Abstract:
A video processing system including:a) error detection means arranged to detect errors in and/or loss of information in a primary video signal and to identify a particular picture and a region within the picture of the primary video signal containing each such error in or loss of information; and b) video signal processing means for producing a secondary video signal as an error concealed version of the primary video signal, wherein regions of the primary video signal that do not contain errors in or loss of information are copied directly to the secondary signal from the primary signal and in which each error concealed region in the secondary signal corresponding to an error region in the primary signal containing errors in or loss of information is generated by means of motion-compensated prediction from a previous picture in the secondary video signal, the video signal processing means including error concealment means for generating each error concealed region in the secondary signal, the error concealment means including: i) identification means for identifying, in relation to each error region in the primary signal, a primary tag region of the current picture of the secondary signal located in a known location in close proximity to the respective error region; ii) scanning means for scanning a previous picture of the secondary signal to locate a secondary tag region substantially identical to each primary tag region of the current picture; iii) prediction means for generating error concealed regions of the current picture of the secondary signal by identifying a substitution region located in the same relative location with respect to the secondary tag region as the error region of the current picture of the primary signal is located with respect to the primary tag region; and iv) copying means for copying the substitution region to the respective error region in the current picture of the secondary signal.