Apparatus for detecting sudden changes of a feature in a region

Details Apparatus for detecting sudden changes of a feature in a region Apparatus for detecting sudden changes of a feature in a region

1986-05-21

1988-05-24

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 22, 382 41, G06K 948

Patent

active

047471506

ABSTRACT:
The invention concerns an apparatus for detecting sudden changes of a feature in a region of an image that is divided into discrete picture elements, the feature being represented by complex valued signals, one for each picture element, the signal phase representing the feature class and the signal magnitude representing the certainty in the feature assertion. The apparatus includes a first unit (3) for providing the complex valued signals (10) within the region and at least a second unit for providing at least two collections of complex valued multiplication factor signals (11, 12, 13) that corresponds to the complex valued signals. The apparatus further has a third unit (4) for forming a measurement signal for each collection of multiplication factors, the measurement signal consisting of the sum of the squares of the magnitudes of a first sum signal, which consists of the complex valued products of the complex valued signals (10) and corresponding complex valued multiplication factor signals (11, 12, 13), and a second sum signal, which consists of the complex valued products of the complex valued signals and corresponding conjugate of the complex valued multiplication factor signals. A fourth unit (5) is provided for a complex valued coefficient weighted summation of a function, which depends on the complex valued multiplication factor signals, of the measurement signals from the third unit (4).

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Reprinted from Proceedings of the IEEE Computer Society Conference on Pattern Recognition and Image Processing, PRIP 82, Las Vegas, Jun. 1982. "A Consistency Operation for Line and Curve Enhancement"--Martin Hedlund et al., pp. 1-4.

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