H - Electricity – 04 – N
Patent
H - Electricity
04
N
H04N 1/405 (2006.01)
Patent
CA 2146104
A method of generating a threshold array made up of a plura- lity of dot profiles, each of which is made up of a plurality of black or white pixels, certain of the pixels in certain of the dot profiles being constrained to be either black or white. The steps of the method are: (1) assigning a value to each unconstrained pixel of one of the dot profiles, each such value being interpre- table as black or white; (2) based upon whether a function of the values of the pixels within a predetermined area of the dot profile is different from a predetermined desired value, adjusting the value assigned to a particular pixel within the predetermined area such that in a fraction of the cases, the adjusted value is inter- pretable as the opposite color from the unadjusted value; and (3) repeating step (2) for additional predetermined areas of the dot profile until the entire dot profile has been covered; and repeat- ing steps (1) through (3) for each of the dot profiles in the threshold array, whereby the dot profiles in the resulting thres- hold array are substantially free of annoying visible patterns.
Adobe Systems Inc.
Riches Mckenzie & Herbert Llp
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