US 7,538,816 B2
Image-taking apparatus and control method of image-taking apparatus
Yoshihito Harada, Yokohama (Japan)
Assigned to Canon Kabushiki Kaisha, Tokyo (Japan)
Filed on Aug. 29, 2005, as Appl. No. 11/214,486.
Claims priority of application No. 2004-255940 (JP), filed on Sep. 02, 2004; and application No. 2005-241061 (JP), filed on Aug. 23, 2005.
Prior Publication US 2006/0087573 A1, Apr. 27, 2006
Int. Cl. H04N 5/235 (2006.01)
U.S. Cl. 348—362  [348/363] 24 Claims
OG exemplary drawing
 
1. An image-taking apparatus comprising:
an image-pickup device which accumulates charge in accordance with an amount of light received thereon;
a light-shielding device which changes a light-shielded area in the image-pickup device by causing a light-shielding blade to travel, the light-shielding blade shielding a light-receiving surface of the image-pickup device;
a scan circuit which performs a first scan for starting accumulation of charge for each area of the image-pickup device and performs a second scan for reading the accumulated charge for each area of the image-pickup device; and
a control circuit which calculates a travel characteristic of the light-shielding device based on an amount of first charge accumulated in a time period between one of the first and second scans and the travel of the light-shielding device.