SYSTEM FOR SUB-BAND ENCODING BETWEEN MOTION COMPENSATION FRAMES

摘要

PURPOSE:To enable the sub-band encoding between motion compensation frames with high pixel precision by performing inter-frame prediction and in-frame encoding for data in a frequency domain. CONSTITUTION:An input image 1 is compared with the image of a preceding frame stored in a frame memory 9 and a 1st-stage sub-band division filter processing part 10 filters the image of the preceding frame stored in the frame memory 9 in the unit of macroblock corresponding to a shift quantity by using a motion vector obtained by calculation. Then a 2nd-(N)th-stage sub-band division filter processing part 11 performs normal sub-band division. The filter output of a final stage, i.e., a prediction filter output coefficient 3 is compared with the filter output coefficient obtained as a result of dividing in sub bands from the input image 1 by the sub-band division of a 1st-(N)th-stage sub-band division filter processing part 2 and when the power of a difference filter coefficient 4 between motion compensation frames is smaller than the power of input data, the coefficient 3 is handled as an object of encoding in inter-frame difference mode.