Image analysis – Histogram processing – For setting a threshold
Patent
1986-12-01
1990-01-23
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
382 27, 382 52, G06K 948
Patent
active
048963640
ABSTRACT:
A method of detecting edge structures in a video signal, with a decision criterion being derived from the environment pixels of an image pixel so as to realize image coding with the least number of bits possible. The object of detecting all of the oblique edges i.e. edges which are not horizontal or vertical, is accomplished in that an average is formed from the environment pixels of an image pixel and this average is then compared with each environment pixel so as to obtain an output signal having one of three-values (1, 0, -1) dependiing on whether the luminance or chrominance values of the particular environment pixel is above, within or below a given tolerance range. A conclusion as to the existence of an edge and its orientation is then drawn from the number of immediately consecutive identical positive or negative values (1 or -1) of this possible three-valued signal for an image pixel and from the position of the changes in value within the sequence of environment pixels.
REFERENCES:
patent: 3717847 (1973-02-01), Kakuta
patent: 3899771 (1975-08-01), Saraga
patent: 3982227 (1976-09-01), Joynson
patent: 4156231 (1979-05-01), Edamatsu
patent: 4174514 (1979-11-01), Sternberg
patent: 4189711 (1980-02-01), Frank
patent: 4205341 (1980-05-01), Mitsuya
patent: 4326190 (1982-04-01), Borland
patent: 4399461 (1983-08-01), Powell
patent: 4501016 (1985-02-01), Persoon
patent: 4506382 (1985-03-01), Hada
patent: 4577235 (1986-03-01), Kannapell
patent: 4578715 (1986-03-01), Yamaguchi
patent: 4593325 (1986-06-01), Kannapell
patent: 4669123 (1987-05-01), Kobayashi
patent: 4677479 (1987-06-01), Hatori
William K. Pratt, "Two-Dimensional Unitary Transforms", Digital Image Processing (1978), pp. 232 to 278 and pp. 471-499.
Hyde et al, "Subpixel Edge Estimation", Pattern Recognition, vol. 16, No. 4, 1983, pp. 413-420.
Patent Abstracts of Japan, vol. 6, No. 12, Jan. 23, 1982.
ANT Nachrichtentechnik GmbH
Boudreau Leo H.
Mancuso Joseph
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