Compression device and decompression device

Details Compression device and decompression device Compression device and decompression device

2004-06-30

2008-08-26

Dang, Duy M (Department: 2624)

Image analysis

Image compression or coding

Shape, icon, or feature-based compression

C382S232000, C382S233000

Reexamination Certificate

active

07418145

ABSTRACT:
In a compression device, a central processing unit acquires data containing a plurality of element points for specifying the shape of an object composing the map image, and thereafter calculates a second-order differential value of a predetermined one of the plurality of element points acquired. The second-order differential value is a differential value between a first-order differential value of the predetermined element point and a first-order differential value of an immediately preceding element point, and the first-order differential value is a differential value between a coordinate value of the predetermined element point and a coordinate value of the immediately preceding element point. The central processing unit further generates compressed data containing the second-order differential value calculated thereby.

REFERENCES:
patent: 5572605 (1996-11-01), Toraichi
patent: 6167155 (2000-12-01), Kostrzewski et al.
patent: 1134674 (2001-09-01), None
patent: 2001-56823 (2001-02-01), None
patent: 2001-66146 (2001-03-01), None
patent: 2002-107169 (2002-04-01), None

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