Color image compressing method and device

Details Color image compressing method and device Color image compressing method and device

2004-07-01

2010-06-01

Tran, Douglas Q (Department: 2625)

Facsimile and static presentation processing

Natural color facsimile

Specific image-processing circuitry

C358S001900

Reexamination Certificate

active

07729025

ABSTRACT:
It is an object of the present invention to improve the compression ratio of a color image and to clearly display the outlines of characters and the like. A hue cluster classifying/unifying unit reduces the number of hue values of each pixel in a color image, based on a hue histogram, allocates the number-reduced hue value to each pixel and classifies pixels with the same hue value into one cluster. Furthermore, the unit unifies clusters whose hue values are below a predetermined value. The unit also traces the outline of a cluster whose size is below a reference value and determines that a cluster that has a lot of change points belongs to a character area. An encoding unit determines the characteristic of each cluster, based on both an area determined by an area determining unit and whether the cluster belongs to a ruled line area or a character area, and encodes pixels in each cluster by a coding method suitable for the characteristic of the cluster.

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