Contrast detecting apparatus for controlling an automatic focusi

Details Contrast detecting apparatus for controlling an automatic focusi Contrast detecting apparatus for controlling an automatic focusi

1990-10-25

1994-11-29

Mancuso, Joseph

Television

Camera, system and detail

Optics

354400, H04N 5232

Patent

active

053694350

ABSTRACT:
A contrast detecting apparatus includes first extracting means for extracting a signal component of a first frequency band from a luminance signal obtained by imaging a subject, second extracting means for extracting a signal component of a second frequency band lower than the first frequency band from the luminance signal obtained by imaging the subject, and determining means for determining a state of contrast of the subject in accordance with extracted outputs of the first and second extracting means. Therefore, when the contrast detecting apparatus is used, it can be exactly and automatically determined whether the contrast of the subject exists or not in accordance with a luminance signal obtained from the subject. In addition, when the contrast detecting apparatus is applied to the automatic focusing apparatus, it is possible to control the drive of lens or information supplying means to users in accordance with whether the contrast of the subject exists or not, and as a result when the subject having no contrast is imaged, the lens is stopped to be driven so that function and operability of the automatic focusing apparatus can be improved.

REFERENCES:
patent: 4542289 (1985-09-01), Yokoyama et al.
patent: 4804831 (1989-02-01), Baba et al.
patent: 4872058 (1989-10-01), Baba et al.
patent: 4882601 (1989-11-01), Taniguchi et al.
patent: 4903134 (1990-02-01), Murashima et al.
patent: 4967279 (1990-10-01), Murashima
patent: 4967280 (1990-10-01), Takuma et al.
"T.V. Camera Automatic Focal Point Adjustment by Hill-Climbing Servo Mechanism", vol. 17, No. 1, pp. 26, 1965, in NHK Technical Report.

Affiliated with

Also associated with

Rating

Contrast detecting apparatus for controlling an automatic focusi does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Contrast detecting apparatus for controlling an automatic focusi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Contrast detecting apparatus for controlling an automatic focusi will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-76505