Patent ID: 6580830
Filing Date: 2003-06-17
Classification: G06F,H04N

Abstract:
A picture decoding apparatus for decoding moving picture data of a second resolution from compressed picture data of a first resolution, obtained on predictive coding by motion prediction in terms of a pre-set pixel block as a unit and on compression coding in terms of a predefined pixel block as a unit, the second resolution being lower than the first resolution, comprising:first inverse orthogonal transform means for inverse orthogonal transforming an orthogonal transform block of the compressed picture data, orthogonal transformed by an orthogonal transform system associated with interlaced scanning; second inverse orthogonal transform means for inverse orthogonal transforming an orthogonal transform block of said compressed picture data, orthogonal transformed in accordance with an orthogonal transform system associated with sequential scanning; addition means for summing the compressed picture data, inverse orthogonal transformed by said first inverse orthogonal transform means or said second inverse orthogonal transform means, to motion compensated reference picture data to output moving picture data of the second resolution; memory means for storing moving picture data outputted by said addition means as reference picture data; and motion compensation means for motion compensating a macro-block of the reference picture data stored in said memory means; wherein said motion compensation means includes: first motion compensation means for motion compensating a macro-block of reference picture data motion-predicted in accordance with a motion prediction system associated with interlaced scanning; and second motion compensation means for motion compensating a macro-block of reference picture data motion-predicted in accordance with a motion prediction system associated with sequential scanning; said first motion compensation means and the second motion compensation means interpolating respective pixels of the macro-block of reference picture data stored in said memory means to generate a macro-block constituted by pixels of Â¼ pixel precision for the reference picture data stored in said memory means to execute motion compensation on the generated macro-block.