Method of and apparatus for detecting heights of points on...

G - Physics – 06 – K

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G06K 9/46 (2006.01) G06T 7/00 (2006.01)

Patent

CA 1220276

- 1 - Abstract: Several characteristics are assigned to the regions of a picture having light and shade and obtained by photographing a surface of an object. Several characteristics are also assigned to the regions of the picture, which characteristics are extracted on the basis of the results of the first property-assigning operation, and the boundary lines therebetween. The angles of inclination of these regions and the unevenness of the regions of the surface that are on these boundary lines are estimated by utilizing the relation between the above-mentioned characteristics and the direction in which the light is applied to the object while it is photographed. The relative elevation of the surface of the object is thus determined. The above-mentioned characteristics are determined with respect to pictures that have been obtained by photographing a surface of the same object from different positions, and the characteristics thus determined of these pictures are compared to determine the corresponding points. The quantitative elevation of the surface of the object is then determined in accordance with the principle of triangulation using the corresponding points thus determined.

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