Method and apparatus for generating screened halftone images
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United States of America Patent
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Dec 3, 1985
Grant Date -
N/A
app pub date -
Dec 21, 1983
filing date -
Dec 27, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Apparatus and method for generating screened halftone images, which includes means for assuming an area of halftone dots with desired periodicity and tone reproducibility, subdividing the area into minute cells and setting address values (X, Y) for each of the minute cells, computing out a threshold value of density for each of said cells as a function f (X, Y) of the relevant address values (X, Y), and using the computed value as threshold value of density for the cell, means for obtaining a density-related video signal of the portion of the original corresponding to each of said cells by scanning the original, and means for producing halftone dot signals by comparing the video signals and the threshold value of density with each other.
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