Method of detecting solid shape of object with autofocusing and

Details Method of detecting solid shape of object with autofocusing and Method of detecting solid shape of object with autofocusing and

1990-08-02

1992-09-29

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356376, 2502017, G01N 2186

Patent

active

051516098

ABSTRACT:
The solid shape of an object is detected by viewing the objects along a Z-axis direction. A plurality of images of the object are picked up at different focus levels having correspondingly different Z-axis coordinate values. Focus measure values are calculated with respect to each of the pixels that are in each of the object images and that are designated by the same X- and Y-coordinate values. The focus measure values of the pixels in the object images having the same X- and Y-coordinate values are compared with each other to detect maximum focus measure values. The solid shape of the object is then estimated based on the Z-coordinate value of the focus level of the object image having the maximum detected focus measure values.

REFERENCES:
patent: 4929843 (1990-05-01), Chmielewski, Jr. et al.
patent: 4996415 (1991-02-01), Tanaka et al.
Takatoshi Ota et al., "A Method for Image Composition Using Image Variance", Journal of the Institute of Electronics and Communication Engineers of Japan, 83/10 vol. J66-D, No. 10, pp. 1245-1246.
A. P. Pentland, "A New Sense for Depth of Field", IEEE Transactions on Pattern Analysis and Machine Intelligence, vol. PAMI-9, No. 4, pp. 523-531 (Jul. 1987).
P. Grossmann, "Depth from focus", Pattern Recognition Letters, vol. 5, No. 1, pp. 63-69 (Jan. 1987).
T. Darrel et al., "Pyramid Based Depth from Focus", Proceedings of Computer Vision and Pattern Recognition, pp. 504-509, The Computer Society, Ann Arbor, MI, Jun. 5-9, 1988.

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