Method and device for compressing image data

Details Method and device for compressing image data Method and device for compressing image data

2006-07-10

2010-06-29

Zimmerman, Mark K (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S003130, C358S003190, C382S270000, C382S273000

Reexamination Certificate

active

07746501

ABSTRACT:
A method for compressing image data includes a first step for dividing image data into predetermined areas and determining a representative value about density of pixels in each area, a second step for determining density of pixels included in each area by using the representative value of the area and an interpolation rule, a third step for determining reproducibility of an image obtained, on the basis of the density of pixels determined in the second step, by using the image data and a dither pattern that is used for a pseudo gradation process performed on the image data, and a fourth step for encoding, on the basis of the representative value determined in the first step, for areas that are determined to have a good reproducibility in the third step.

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