Image scanning process and unit for detecting set forms

Details Image scanning process and unit for detecting set forms Image scanning process and unit for detecting set forms

1985-04-17

1987-09-22

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

382 48, G06K 920

Patent

active

046960490

ABSTRACT:
Image scanning process for detecting set forms, the main characteristic of the process being that it includes a first stage consisting in analysing signals representing points on the said image, in selecting first points defining areas in which the variation in contrast exceeds a given threshold, and in determining the direction of the tangent line relative to each of the said first points; a second stage consisting in detecting whether, for each of the said first points there exist other first points lying on at least one line having a set length and angle in relation to the direction of the line tangent with the point in question and in projecting onto said tangent line if the direction of the said other point lying on the said line has a second set angle in relation to said tangent line; a third stage consisting in memorizing and accumulating the number of the said projections relative to the said projection points and in extracting the said projection points whose accumulated value exceeds a given number threshold; and a fourth stage consisting in selecting from among the said extracted points those defining the set form.

REFERENCES:
patent: 4115803 (1978-09-01), Morton
patent: 4428077 (1984-01-01), Shimada et al.
patent: 4566124 (1986-01-01), Yamamoto et al.

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