Detecting compositional change in image

Television – Camera – system and detail – Optics

Patent

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Details

348347, 348354, G03B 1300

Patent

active

060671149

ABSTRACT:
A method obtains an electrical signal from the photoelectric detector, which signal corresponds to the illumination of the image formed by the focusing lens. The image screen is divided into a plurality of subdivision areas. The method then calculates for the respective subdivision areas a focus evaluation value representative of a high frequency component contained in the electrical signal and a brightness value representative of a brightness of the image. The subdivision areas are sorted in accordance with a object distance classification. The method weights with different weights the subdivision areas on the basis of the subdivision area to which a main object belongs. Variations in the focus evaluation and brightness values are calculated by comparing the values after a focus and the values for an in-focus image. Compositional changes are detected based on the weights and the variation in the focus evaluation and brightness values.

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patent: 5343246 (1994-08-01), Arai et al.
patent: 5422671 (1995-06-01), Yamada et al.
patent: 5703644 (1997-12-01), Mori et al.
patent: 5920349 (1999-07-01), Okino et al.

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