US 9,813,624 B2
Image pickup apparatus including infrared light reduction section, method of controlling the same, and storage medium
Ryo Kawasaki, Yokohama (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Oct. 19, 2015, as Appl. No. 14/886,403.
Claims priority of application No. 2014-220204 (JP), filed on Oct. 29, 2014; application No. 2014-220205 (JP), filed on Oct. 29, 2014; and application No. 2014-220206 (JP), filed on Oct. 29, 2014.
Prior Publication US 2016/0127659 A1, May 5, 2016
Int. Cl. H04N 5/33 (2006.01); H04N 5/232 (2006.01); H04N 5/225 (2006.01)
CPC H04N 5/23245 (2013.01) [H04N 5/2254 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An image pickup apparatus including an image pickup device that has an optical image formed thereon through a photographic optical system, and outputs an image signal corresponding to the optical image, the image pickup apparatus comprising:
an infrared light reduction unit configured to be inserted between the photographic optical system and the image pickup device so as to reduce an amount of infrared light contained in the optical image reaching the image pickup device;
a first detection unit configured to detect a luminance of an object according to the image signal to thereby obtain a first detection result;
a second detection unit disposed at a location different from a location of the image pickup device and configured to detect a luminance of the object to thereby obtain a second detection result;
a processing unit configured to, in a case where the first detection result is lower than a first switching threshold value set in advance, generate a second switching threshold value used for comparison with the first detection result and a third switching threshold value used for comparison with the second detection result, based on the first detection result, the second detection result, and the first switching threshold value, and make one of the second switching threshold value and the third switching threshold value equal to or higher than the other of the second switching threshold value and the third switching threshold value, wherein (a) the processing unit is further configured to perform a comparison between (i) a difference between the first detection result and the second detection result and (ii) a difference threshold value set in advance, and the making one of the second switching threshold value and the third switching threshold value equal to or higher than the other of the second switching threshold value and the third switching threshold value is performed in accordance with the comparison, or (b) the processing unit is further configured to perform a comparison between (i) a ratio between the first detection result and the second detection result and (ii) a ratio threshold value set in advance, and the making one of the second switching threshold value and the third switching threshold value equal to or higher than the other of the second switching threshold value and the third switching threshold value is performed in accordance with the comparison, or (c) the processing unit is further configured perform a comparison between the first detection result and the second detection result, and the making one of the second switching threshold value and the third switching threshold value equal to or higher than the other of the second switching threshold value and the third switching threshold value is performed in accordance with the comparison; and
an insertion/removal control unit configured to perform insertion/removal control for selectively inserting or removing said infrared light reduction unit into or from an optical path between the photographic optical system and the image pickup device, based on the first detection result, the second detection result, the second switching threshold value, and the third switching threshold value.