Data compression apparatus and data compression program...

Details Data compression apparatus and data compression program... Data compression apparatus and data compression program...

2006-12-20

2010-12-14

Ge, Yuzhen (Department: 2624)

Image analysis

Color image processing

Compression of color images

C382S239000

Reexamination Certificate

active

07853077

ABSTRACT:
A data compression apparatus has: first difference creating section that creates first difference data including a succession of numerical values representing differences between adjacent numerical values on numerical values constituting the color data; second difference creating section that creates second difference data including a succession of numerical values representing a difference between first difference data and another first difference data of respectively different color data; offset section that offsets the numerical values of individual difference data by a predetermined value; dividing section that divides the individual numerical values into upper order data comprising a succession of numerical values of the upper order unit bit portion and lower order data comprising a succession of numerical values of the lower order of unit bit portion; upper order data compression section and lower order data compression section that respectively apply reversible compression processing to the upper order data and the lower order data.

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