Patent ID: 7136416
Filing Date: 2006-11-14
Classification: H04N

Abstract:
1. A video decoding method comprising: receiving encoded data of a video signal containing a variable length code generated by encoding transform coefficients obtained by orthogonal transformation of the video signal by using code words decodable in both a forward direction and a backward direction; detecting a sync section of the encoded data; decoding the encoded data in the forward direction in the detected sync section; decoding the encoded data in the backward direction in the detected sync section; and determining a final decode result from decode results obtained by decoding the encoded data in the forward direction and the backward direction, wherein each of the decoding in the forward direction and the decoding in the backward direction includes detecting an error in the encoded data, and the determining includes determining a decode value by using an error detection position in the encoded data in units of bits and an error detection position in the decoded data in units of syntax, which are detected by the decoding in the forward direction and indicate an error position in the encoded data, and an error detection position in the encoded data in units of bits and an error detection position in units of syntax, which are detected by the decoding in the backward direction and indicate an error position in the encoded data wherein when an error is detected in the encoded data in the sync section, the determining includes discarding part or all of encoded data composed of macroblock transform coefficients having undergone intraframe encoding within a macroblock in which no error has been detected.