In-focus detection method and method and apparatus using the sam

Details In-focus detection method and method and apparatus using the sam In-focus detection method and method and apparatus using the sam

1993-07-12

1995-04-04

Britton, Howard W.

Television

Special applications

Object or scene measurement

348345, 348357, H04N 718

Patent

active

054041635

ABSTRACT:
An image of the surface of a measuring object is picked up by a video camera while the distance to the measuring object is changed, and the in-focus state of the video camera is detected from the fact that the contrast, which is defined by the sum of the n-th (n: integer greater than 1) power of differences in brightness between adjoining pixels in the image, has reached its maximum. Further, the position of the surface of the measuring object is measured according to the position of the video camera in the in-focus state.

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Ligthart, Guido et al., "A comparison of Different Autofocus Algorithms," IEEE International Conference on Pattern Recognition, 1982, pp. 597-600.
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Yoshimasa Oshima, et al., "Automatic Optical Focusing Method Applicable to Semiconductor Wafers (Aluminum Patterns)," The 22nd SICE Scientific Lecture (Jul. 27-28-29, 1983), pp. 223-224.

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