Image analysis – Image enhancement or restoration – Variable threshold – gain – or slice level
Patent
1996-12-17
1998-04-07
Shalwala, Bipin
Image analysis
Image enhancement or restoration
Variable threshold, gain, or slice level
382265, 382275, 358455, 358460, 358465, H04N 140, G06K 938, G06K 940
Patent
active
057374520
ABSTRACT:
A method of generating a threshold array made up of a plurality 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 interpretable 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 interpretable 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 repeating steps (1) through (3) for each of the dot profiles in the threshold array, whereby the dot profiles in the resulting threshold array are substantially free of annoying visible patterns.
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Yao et al., Modified Approach to the construction of a blue noise mask, J. Electronic Imaging, Jan. 1994.
Adobe Systems Incorporated
Shalwala Bipin
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