Photography – With exposure objective focusing means – focusing aid – or... – Processing circuit
Patent
1995-06-30
1997-03-18
Gray, David M.
Photography
With exposure objective focusing means, focusing aid, or...
Processing circuit
G03B 300
Patent
active
056127634
ABSTRACT:
A focus detection device is disclosed that establishes a focus detection algorithm range on photoelectric conversion element arrays and detects the contrast distribution of the output signal strings of the arrays corresponding to this algorithm range. Moreover, the focus detection device determines transformation coefficients for the algorithm range based on a detected contrast distribution and coefficients predefined for some of a plurality of photo-electric conversion elements of the photo-electric conversion element arrays. The focus detection device computes the relative shift amount of the output signal strings corresponding to the algorithm range, and converts the shift amount into a defocus amount of a shooting lens based on the determined transfer coefficients. Moreover, while relatively shifting the pair of output signal strings of the pair of photo-electric conversion element arrays by a specific amount within the predetermined shift range, the invention computes a correlation-amount at each shift position and detects the focus adjustment condition of the shooting lens based on the shift position yielding the minimum correlation amount. The detected focus adjustment condition is determined to have a high level of confidence if the amount of change in the correlation amount in the vicinity of the shift position yielding the relatively minimum correlation amount satisifies specified conditions.
REFERENCES:
patent: 4561749 (1985-12-01), Utagawa
patent: 5068682 (1991-11-01), Utagawa
patent: 5258801 (1993-11-01), Kusaka et al.
patent: 5389995 (1995-02-01), Uchiyama
patent: 5469240 (1995-11-01), Uchiyama et al.
patent: 5481329 (1996-01-01), Uchiyama et al.
patent: 5483318 (1996-01-01), Hamada et al.
patent: 5485002 (1996-01-01), Kusaka
patent: 5485003 (1996-01-01), Kusaka
Gray David M.
Nelson Eric
Nikon Corporation
LandOfFree
Focus detection device and method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Focus detection device and method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Focus detection device and method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1709430