Method and a circuit for determining a contour in an image

Details Method and a circuit for determining a contour in an image Method and a circuit for determining a contour in an image

1982-01-21

1984-02-28

Rosenberger, R. A.

Optics: measuring and testing

Angle measuring or angular axial alignment

Sides of angle or axes being aligned transverse to optical...

356152, 250202, G05B 19405

Patent

active

044339127

ABSTRACT:
In a method and a circuit for determining a contour-defining angle formed by a contour in an image within a relatively small region thereof with a predetermined direction, the steps include selecting the region so that said contour passes as closely as possible through a center thereof, and subdividing the region into a number of sectors of substantially equal areas distributed substantially symmetrically about its center, and separated from one another by respective separation lines, the number being an even number and at least four, and one of the separation lines coinciding with the predetermined direction, obtaining brightness signals from each of the sectors in dependence of the proportion of the dark-to-light areas extending over each respective sector, generating difference signals from respective oppositely disposed sectors, processing the difference signals so as to identify the sector in which the transition from the light area to the dark area occurs, and determining by further processing the contour-defining angle.

REFERENCES:
patent: 3497694 (1970-02-01), Jura et al.
patent: 3634689 (1972-01-01), Ejiri et al.
patent: 3970391 (1976-07-01), Johnson et al.
patent: 4160199 (1979-07-01), Bardwell
patent: 4277169 (1981-07-01), Krieg
patent: 4300170 (1981-11-01), Sakamoto

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