IMAGING DEVICE

摘要

The present invention is to correctly perform auto focus operation with various subjects. An imaging device (10) that images a subject includes a focus lens group (16) that collects a light beam from the subject and forms an image of the subject, a focus motor (13) that drives the focus lens group (16) in the optical axis direction, and an imaging element (30) that performs photoelectric conversion of the light beam and outputs a video signal. The imaging device (10) further includes a contrast signal generator (42-1) that generates and outputs a lower-frequency contrast signal C0 from a luminance component of the video signal, an AF processor (53) that employs the lower-frequency contrast signal C0 as an auto focus evaluation value and moves the focus lens group (16) to the in-focus position with wobbling the focus lens group (16), and a histogram signal generator (45-1) that generates and outputs a high-luminance pixel count Hb of the video signal. The AF processor (53) varies the amplitude of the wobbling of the focus lens group (16) based on the high-luminance pixel count Hb.

主权项

1. An imaging device that images a subject, the imaging device comprising:
a focus lens that collects a light beam from the subject and forms an image of the subject; a drive section that drives the focus lens in optical axis direction; an imaging section that performs photoelectric conversion of the light beam collected by the focus lens and outputs a video signal; a contrast signal generator that extracts a first high-frequency component from the video signal and integrates the first high-frequency component to generate and output a first contrast signal; an auto focus controller that employs the first contrast signal as an evaluation value and moves the focus lens to an in-focus position with wobbling of the focus lens by the drive section; and a histogram signal generator that generates and outputs a histogram signal relating to luminance and a pixel count in the video signal; wherein the auto focus controller varies amplitude of the wobbling of the focus lens based on the histogram signal output by the histogram signal generator.