Patent ID: 6360016
Filing Date: 2002-03-19
Classification: H04N

Abstract:
An image prediction decoding apparatus for decoding an input bit stream, the bit stream including variable length encoded DCT coefficients and an indication bit, said image prediction decoding apparatus comprising:a variable length decoder operable to decode the variable length encoded DCT coefficients into a one-dimensional array of DCT coefficients; and an inverse scanning device operable to inverse scan the one-dimensional array of DCT coefficients into a two-dimensional array of DCT coefficients; wherein said inverse scanning device is operable to perform either one of following scans: (1) a zigzag scan when the indication bit indicates that AC coefficients of a current block are not predicted from an adjacent block in coding; and (2) either a vertical scan or a horizontal scan adaptively selected when the indication bit indicates that the AC coefficients of a current block are predicted from an adjacent block.