|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||250/201 ; 354/408|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 4 인용 특허 : 5|
An automatic focal point control apparatus for optical equipment such as cameras can properly respond to different objects and changes in objects, thus providing stable operation. In the apparatus, defocus signals are calculated according to object image data concerning an object to be photographed, information effective for focal point calculation is extracted from the object image data, and the defocus signals are weighted and averaged by weighting coefficients corresponding to the effective information signals, thereby obtaining a statistical defocus ...
An apparatus for causing a focusing optical system to form an object image on a predetermined surface, including: (a) means for detecting a light intensity distribution of light from an object on the predetermined surface and sequentially producing object image data; (b) defocus signal producing means responsive to said object image data for time-serially producing defocus signals representing a positional relationship between said predetermined surface and said object image; (c) contrast detecting means responsive to said object image data for time-seri...