VIDEO SIGNAL CODING AND DECODING METHOD

The feature points of the input video signal are detected by canny edge detecting method, the coordinates of the feature points detected are detected is chain coded, the length of the region, including the feature points, of which edge intensity is the specified value or more in the edge intensity maximum change direction at the feature point coordinates obtained when the feature point is detected, are coded. The chain-coded data and the region length coded data are then multiplexed. Thereby, the amount of bits required for coding of the coordinates information can be reduced, as a result the total amount of codes can be reduced.