US 6,982,757 B2
Image sensing apparatus
Motoi Tariki, Kanagawa (Japan)
Assigned to Canon Kabushiki Kaisha, Tokyo (Japan)
Filed on Jul. 11, 2001, as Appl. No. 9/903,174.
Claims priority of application No. 2000-210069 (JP), filed on Jul. 11, 2000.
Prior Publication US 2002/0008766 A1, Jan. 24, 2002
Int. Cl. H04N 9/64 (2006.01); H04N 5/76 (2006.01); H04N 5/228 (2006.01); H04N 1/38 (2006.01); H04N 1/40 (2006.01)
U.S. Cl. 348—243 11 Claims
OG exemplary drawing
 
1. An image sensing apparatus comprising:
an image sensor;
a shielding member capable of shielding a light to said image sensor from an object;
a storage area adapted to store first signals for at least two frames independently, wherein the first signals are generated by said image sensor when a light to said image sensor from the object is shielded by said shielding member;
a first controller adapted to repeatedly overwrite new first signals in said storage area of the at least two frames in an alternative order;
a second controller adapted to stop overwriting a new first signal in the storage area when a capturing operation of a second signal is designated after the new first signal begins to overwrite in the storage area, wherein the second signal is generated by said image sensor when a light to said image sensor from the object is not shielded by said shielding member; and
a correction unit adapted to correct the second signal based on a most recent first signal stored with a complete frame in said storage area before the capturing operation of the second signal is initiated.