Method for correcting television signals

Details Method for correcting television signals Method for correcting television signals

H - Electricity

04

N

350/81

H04N 7/68 (2006.01) H04N 7/30 (2006.01)

Patent

CA 1287164

ABSTRACT OF THE DISCLOSURE A method of correcting television signals transmitted in frames is described. Typically, each frame has different fields composed of blocks wherein each block is constituted by a matrix of pixels defining gray or chromaticity values. Some of these values may be in error, rendering the block defective. The defective block is detected by means of an error detection circuit and the effect of errors in a defective block is reduced with an error concealment circuit which is activated by the error detection circuit when a defective block is detected. The reducing step includes calculating, for a block detected to be defective, substitute information from one of information contained in blocks in an environment of the defective block and information from a signal preceding in time the signal containing the defective block; and replacing the defective block with the calculated substitute information. The calculating step includes calculating the substitute information recursively from pixels at the borders of the defective block to the interior of such block.

519506

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