Multidimensional multi-valued color image compression and decomp

Image analysis – Image compression or coding

Patent

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382166, G06K 900

Patent

active

056218192

ABSTRACT:
A multidimensional multi-valued image compression and decompression method obtains feature points satisfying a specific condition on an equi-luminance line set for each specific luminance value previously determined for an image luminance function, and transmits and records positions and luminance values at the feature points to restore an image. In compression, pixel contours are traced on the equi-luminance line set. Specific equi-luminance line passing point coordinates on the pixel contours are shifted to a central position of each pixel. In decompression, a region where the equi-luminance line on the image is a boundary is divided into a bright and a dark region according to a luminance threshold. The divided regions are filled with bright and dark symbols, respectively, to form a mask representative of the image based on the bright and dark symbols.

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