Three-dimensional imaging technique using sharp gradient of illu

Details Three-dimensional imaging technique using sharp gradient of illu Three-dimensional imaging technique using sharp gradient of illu

1989-11-24

1992-03-31

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

382 8, 382 62, 358 88, 356 12, G06K 900

Patent

active

051014424

ABSTRACT:
A three-dimensional image of a substrate (10) is obtained by separately spanning the substrate with each of two lines of light (30,32) directed at the substrate surface (12) at the same angle but offset from each other, to illuminate a separate one of a pair of strips (34,36). A linescan camera (38) is trained on the substrate surface (12) to sense the intensity of the light reflected from a strip (40) lying between the strips (34,36) separately illuminated by the lines of light (30,32). The height (or depth) of each attribute (e.g. a component 17) lying in the strip may be obtained in accordance with a prescribed relationship between the sensed reflectance intensity attributed to each of the lines of light (30,32). A slide (50) is provided for displacing the substrate (10) relative to the linescan camera (38) and the two lines of light (30 and 32) to enable the height of the attributes in each of a plurality of contiguous strips of area on the surface (12 ) to be established, allowing a three-dimensional image to be obtained.

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B. Carrihill and R. Hummel, "Experiments with the Intensity Ratio Depth Sensor", Computer Vision, Graphics, and Image Processing, 32, 337-358 (1985).

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