Image processing apparatus and method to reduce gray levels...

Details Image processing apparatus and method to reduce gray levels... Image processing apparatus and method to reduce gray levels...

2005-10-18

2005-10-18

Grant, II, Jerome (Department: 2626)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S003020, C358S003030, C358S003040, C358S003190

Reexamination Certificate

active

06956673

ABSTRACT:
An image processing apparatus capable of providing an output image which is close to an actual image observed with human eyes is structured in the following way. An image data from an input unit is supplied from an output unit with a reduced number of gray levels. Based on an input value, an occurrence probability determining unit outputs dot occurrence probabilities d1-d3for reproducing respective gray levels. Initial thresholds t1-t3from an initial threshold generating unit are corrected based on a processed pixel in the vicinity of a pixel to be processed, and thus correction thresholds t′1-t′3are derived. A selecting unit selects which dot is to be output based on the correction thresholds and occurrence probabilities.

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