Method and apparatus for detecting edge spectral features

Details Method and apparatus for detecting edge spectral features Method and apparatus for detecting edge spectral features

1985-03-21

1987-08-04

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

382 22, 382 21, 382 18, G06K 952, G06K 962

Patent

active

046851437

ABSTRACT:
Edge maps (40) derived from images are used to compute edge spectra (44), an edge spectrum having a plurality of components (41, 43) corresponding to the angular bins (60) of edge vectors having equal angular widths. Various feature detectors (56) process the edge spectrum to yield information identifying the image. A linear detector correlates a shifted prototype edge spectrum (45) to an input spectrum (44). Nonlinear detectors analyze edge spectra to detect mutually orthogonal edges and edge reversal features (90). Higher level logic (30) is used to select certain detected edge reversal features (90) as the ends of an object (16) depicted in the image.

REFERENCES:
patent: 4156230 (1979-05-01), Riganati et al.
patent: 4319243 (1982-03-01), Vachenauer
patent: 4545067 (1985-10-01), Juvin et al.
patent: 4567610 (1986-01-01), McConnell
patent: 4653107 (1987-03-01), Shojima

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