Method of and apparatus for detecting heights of points on surfa

Details Method of and apparatus for detecting heights of points on surfa Method of and apparatus for detecting heights of points on surfa

1985-04-15

1987-10-13

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

356 2, 356 3, G06? 900

Patent

active

047003987

ABSTRACT:
Several properties are assigned to the regions of an image having light and shade and obtained by photographing a surface of an object. Several properties are also assigned to the regions of the picture, which are extracted on the basis of the first proper-assigning operation, and the boundary lines therebetween. The angles of inclination of these regions and the condition of the unevenness of the regions of the surface which are on these boundary lines are estimated by utilizing the relation between the above-mentioned properties and the direction of a light source. Thus, the relative elevation of the surface of the object is determined. The above-mentioned properties are determined with respect to images of the same object from different directions, and the properties thus determined of these images are compared to determine the corresponding points, which are utilized to determine the quantitative elevation of the surface.

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patent: 4539701 (1985-09-01), Galbreath et al.
Futamura et al., "Problem Analysis Diagram", JARECT, vol. 12, 1984, pp. 97-115.
Duda et al., Pattern Classification and Scene Analysis, pp. 44-49.
Barnea et al., "A Class of Algorithms for Fast Digital Image Registration", IEEE Transactions on Computers, Feb. 1972, pp. 179-186.

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