Imaging device with autofocus operation
US9172864B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 13, 2011 |
| Grant date | Oct 27, 2015 |
| Priority date | — |
| Expiry date | Nov 13, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B13/36
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.