Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1990-06-20
1992-04-28
Fuller, Benjamin R.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358443, 358458, 358465, 358466, H04N 123, H04N 140
Patent
active
051092824
ABSTRACT:
Apparatus and methods for converting continuous grey tone images into high resolution halftone images utilize an iterative, multi-level, multi-resolution error convergence process. The continuous grey tone image is first binarized. At each level of the process, the binarized image is compared with the grey tone image over a larger window of pixels. Within each window, selected binarized image pixels are tested for possible change in binary assignment. The binary assignment of a given test pixel is changed if the change would result in a lower average error over the entire window. By varying the selection of test pixels, the process can provide clustered dot patterns and dithering.
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Eye Research Institute of Retina Foundation
Frahm Eric
Fuller Benjamin R.
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