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

Television – Special applications – Object or scene measurement

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

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.

REFERENCES:
patent: 4473750 (1984-09-01), Oshida et al.
patent: 4564296 (1986-01-01), Oshida et al.
patent: 4743771 (1988-05-01), Sacks et al.
patent: 4816919 (1989-03-01), Coates
patent: 4829374 (1989-05-01), Miyamuto
patent: 4924247 (1990-05-01), Suzuki et al.
patent: 4985777 (1991-01-01), Kawada
patent: 5107337 (1992-04-01), Ueda et al.
patent: 5126849 (1992-06-01), Senuma et al.
patent: 5204739 (1993-04-01), Pomenicali
patent: 5218395 (1993-06-01), Taniguchi et al.
Ligthart, Guido et al., "A comparison of Different Autofocus Algorithms," IEEE International Conference on Pattern Recognition, 1982, pp. 597-600.
Yoshitada Oshida, "Thickness Measurement of Printed Circuit Patterns Using Automatic Focusing Sensor," Automation, 7, vol. 25, No. 5, 1980, pp. 65-67.
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.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

In-focus detection method and method and apparatus using the sam does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with In-focus detection method and method and apparatus using the sam, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and In-focus detection method and method and apparatus using the sam will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-2382888

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.