Back light detecting method, back light detecting device and image pick-up camera
AssigneeSony Corporation
InventorKoji Inoue
Life of this patent
Estimating the term…
Abstract
A back light detecting method, a back light detecting device and an image pick-up camera for detecting a back light state in view of the pick-up state of a subject. Concerning a pixel other than the pixel within the brightness level between two slice levels given from the outside, its brightness level is integrated to distinguish a subject area AR.sub.M from a background area AR.sub.L. A back light state BLS is estimated from the area HIST.sub.M and the brightness level Y.sub.M of the subject area AR.sub.M. Thereby the back light state can be detected more correctly.
Claims8
An image pick-up apparatus comprising:
- image pick-up means for imaging an optical image from a subject and generating a pick-up signal;
- medium brightness area detecting means for detecting an area of a medium brightness level area, which has a brightness level between a first brightness level and a second brightness level higher than said first brightness level, in a picture formed by said pick-up signal;
- average brightness level of medium brightness region detecting means for detecting an average brightness level of the pick-up signal included in said medium brightness level area;
- and
- back light state detecting means for detecting a back light state showing whether the subject is imaged or not in a back light state on the basis of both said area of the medium brightness level area and said average brightness level.
A back light detecting method for detecting whether a subject is imaged or not in a back light state on the basis of a pick-up signal, comprising the steps of:
- detecting an area of a medium brightness level area, which has a brightness level between a first brightness level and a second brightness level higher than said first brightness level, in a picture formed by said pick-up signal;
- detecting an average brightness level of the pick-up signal included in said medium brightness level area;
- and
- detecting a back light state showing whether the subject is imaged or not in a back light state on the basis of both said area of the medium brightness level area and said average brightness level.
Dependencies are inferred from the claim text.