Patent ID: 7024052
Filing Date: 2006-04-04
Classification: H04N

Abstract:
1. A motion image decoding apparatus for decoding compressed image data obtained through timebase predictive coding effected to compress a motion image, comprising: an image reproduction portion receiving said compressed image data to generate reproduced image data; an orthogonal transform and compression portion receiving an output from said image reproduction portion to effect orthogonal transform for each predetermined data transform block for data compression, said orthogonal transform and compression portion switching for each said predetermined data transform block a rounding system applied after said orthogonal transform, said switching of the rounding system corresponding to alternating between a first rounding process including adding a first value to or subtracting the first value from a numeral value and dividing result by a second value, and a second rounding process including adding a third value to or subtracting the third value from the numeral value and dividing result by the second value, the third value being equal to two times the first value; and a storage receiving an output from said orthogonal transform and compression portion for storing therein reference image data for said predictive coding.