| 摘要 |
A set of first errors selected from sets of errors indexed as, e.g., sets of first to Kth errors between contour segments and corresponding line segments at a predetermined number of sample points on each of line segments, K being a positive integer, fitted to a contour of an object in a video signal by using a polygonal approximation method is encoded and decoded after being transformed and quantized to thereby generate an encoded set of first errors and a decoded set of first errors. Thereafter, the process described hereinafter is repeated for all the remaining sets of errors, from a set of second errors to a set of Kth errors, to thereby generate all the remaining encoded and decoded sets of errors. If a sum of each absolute value of errors in a set of ith errors is not greater than that in a set of ith subtracted errors obtained by subtracting a set of (i-1)st decoded errors from the set of ith errors, the set of ith errors is encoded and decoded after being transformed and quantized to thereby generate an encoded set of ith errors and a decoded set of ith errors. But if otherwise, the set of ith subtracted errors is encoded and decoded after being transformed and quantized to thereby generate an encoded set of ith errors and a decoded set of ith errors, wherein i is a positive integer ranging from 2 to K.
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