Image analysis – Histogram processing – For setting a threshold
Patent
1985-02-22
1986-12-02
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
73 81, 358107, G06K 900
Patent
active
046270965
ABSTRACT:
The specimen (P) carrying the impression (I) is illuminated to create a variation of the impression luminance respect to the neighboring zone, and the image magnification of the impression is then performed by an optical system (OS). The magnified image is scanned with a telecamera (VC) to generate image electrical signals carrying informations indicative of the image luminance. By a technique of image segmentation, a computer (CS) draws from these image signals, position data of a group of image points taken, according to predetermined selection criteria, as belonging to the sides of the impression contour (I). Through the position data of at least some of such points, the position of characteristic points of the impression, for example the impression vertices in the Vickers hardness test, is then extrapolated or interpolated.
REFERENCES:
patent: 4147052 (1979-04-01), Tsujiuchi et al.
patent: 4255966 (1981-03-01), Batie et al.
patent: 4275966 (1981-06-01), Kleesattel
Abdou et al, "Quantitative Design and Evaluation of Enhancement/Thresholding Edge Detectors", Proceedings of the IEEE, vol. 67, No. 5, May 1979.
Barbato Giulio
Grattoni Paolo
Boudreau Leo H.
Consiglio Nazionale Delle Ricerche
Couso Jose Le
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