Facsimile and static presentation processing – Static presentation processing – Attribute control
Reexamination Certificate
2006-04-29
2011-10-11
Park, Chan S (Department: 2625)
Facsimile and static presentation processing
Static presentation processing
Attribute control
C358S003060, C358S003140
Reexamination Certificate
active
08035860
ABSTRACT:
Disclosed is a method for processing FM-AM mixed halftone images on a multi-bit depth imaging apparatus, which relates to a method for producing halftone dots in the field of image hard copying. In the prior art, since it is hard to avoid the impact of the error diffusion for the output apparatus to control the mixed dots with multi-bit imaging depth based on the error diffusion, the output of the mixed dots with multi-bit imaging depth cannot satisfy requirements of the apparatus. According to the method of the present invention, the dynamic algorithm for controlling the multi-bit mixed dots is used for screening based on the existing mixed screening process using dual-feedback error diffusion. Furthermore, multi-bit halftone images with high quality and rich gradations can be output by the multi-bit depth imaging apparatus. The method of the present invention can solve the phenomenon of sawtooth in the margins of the mixed dots output by the conventional single-bit apparatus and obtain the FM-AM mixed dots with the effect of high resolution and continuous gradations, which are output under low resolution.
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Li Haifeng
Yang Bin
Beijing Founder Electronics Co., Ltd.
Nguyen Allen H
Park Chan S
Peking University
Peking University Founder Group Co., Ltd.
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