H - Electricity – 04 – N
Patent
H - Electricity
04
N
H04N 5/21 (2006.01) H04N 7/30 (2006.01) H04N 7/68 (2006.01)
Patent
CA 2090382
A method and apparatus are presented for compensating for lost blocks of image data in transmitted signals, for instance television signals. The method involves a series of steps performed in the receiving apparatus alone. The first step is the detection of a lost image data block. Then an average value is calculated for each data block adjacent to the lost data block, and an average value is also calculated for each data block at those same positions in the preceding frame. A difference value between the pair of average values for each of the respective block positions is determined, and compared to a predetermined threshold value. The lost data block is replaced by either the average value of the adjacent data blocks in the same frame or by the corresponding data block in the preceding frame, the choice depending upon the difference values determined.
Adams Patent & Trademark Agency
Mitsubishi Denki Kabushiki Kaisha
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