Image analysis – Histogram processing – For setting a threshold
Patent
1990-12-14
1991-09-03
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
382 43, 382 39, 364726, G06K 962
Patent
active
050461168
ABSTRACT:
A symbol analyzing system processes spectral power data of an input test symbol for deriving line width and line count information about the symbol, and for generating a reliability confidence for each line count. An excellent controller progressively reduces the spectral power by progressively excluding a larger portion of the upper frequency end of the power spectrum. The excluded power levels are compared to a set of predetermined reference power levels from an ideal reference symbol. Each excluded power level that compares with a reference level is matched with reference coefficients Kw and Kc for that reference level. Each matched excluded power level has a remaining non-excluded power level Pbw in the non-excluded bandwidth BW at the lower end of the frequency spectrum. These included power levels and bandwidths are matched with the reference coefficients. The line width LW and line count LC of the input test symbol are calculated based on the included power levels Pbw, the included bandwidth BW, and the coefficients Kw and Kc.
REFERENCES:
patent: 4674125 (1987-06-01), Carlson et al.
patent: 4764973 (1988-08-01), O'Hair
patent: 4843631 (1981-06-01), Steinpichler et al.
Boudreau Leo H.
Canon Research Center America, Inc.
Hentzel Paul
Klocinski Steven
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