Patent ID: 7932949
Filing Date: 2011-04-26
Classification: G03B,H04N

Abstract:
1. A manual focus adjustment apparatus, comprising: an operation device which moves a lens for forming an image of a subject on an image pickup device in a manual operation; a focal information calculating device which calculates focal information depending on contrast of the subject from an image signal output from the image pickup device each time the lens travels in an operation by the operation device; a focal information display device for graphing focal information about each lens position from a starting point to a current point of a manual focus adjustment corresponding to the lens position according to focal information about each lens position calculated by the focal information calculating device, the focal information display device displaying the focal information about the current point and the focal information about another point as possibly identified on the graph; and a brightness detection device which detects brightness of the subject in the image, wherein the focal information calculating device comprises: wherein the focal information calculating device comprises: a plurality of high pass filters having different passbands for extracting a contrast component of the subject from an image signal output from the image pickup device; and a filter selection device which selects from the plurality of high pass filters, a high pass filter for passing a lower frequency component when the brightness of the subject detected by the brightness detection device is lower, and the focal information calculating device calculates the focal information by adding up contrast components which pass through the high pass filter selected by the filter selection device.