The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 27, 2015
Filed:
Sep. 13, 2011
Hideharu Ono, Tokyo, JP;
Hideharu Ono, Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An imaging device that images a subject includes a focus lens group that collects a light beam from the subject and forms an image of the subject, a focus motor that drives the focus lens group in the optical axis direction, and an imaging element that performs photoelectric conversion of the light beam and outputs a video signal. The imaging device further includes a contrast signal generator that generates and outputs a lower-frequency contrast signal from a luminance component of the video signal, an AF processor that employs the lower-frequency contrast signal as an auto focus evaluation value and moves the focus lens group to the in-focus position with wobbling the focus lens group, and a histogram signal generator that generates and outputs a high-luminance pixel count of the video signal. The AF processor varies the amplitude of the wobbling of the focus lens group based on the high-luminance pixel count.