| US 7,479,993 B2 | ||
| Image device and method for removing noise | ||
| Ken Nakajima, Tokyo (Japan); and Nobuyuki Sato, Tokyo (Japan) | ||
| Assigned to Sony Corporation, Tokyo (Japan) | ||
| Appl. No. 10/432,134 PCT Filed Sep. 03, 2002, PCT No. PCT/JP02/08953 § 371(c)(1), (2), (4) Date Nov. 03, 2003, PCT Pub. No. WO03/028367, PCT Pub. Date Apr. 03, 2003. |
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| Claims priority of application No. 2001-287036 (JP), filed on Sep. 20, 2001. | ||
| Prior Publication US 2004/0135922 A1, Jul. 15, 2004 | ||
| Int. Cl. H04N 5/217 (2006.01) | ||
| U.S. Cl. 348—241 [348/246] | 8 Claims |
| 1. An image capturing apparatus for capturing an object using a solid-state imaging device, comprising:
subtraction means for subtracting second image data, which is captured with a shutter closed under a same exposure condition
as an ordinary capturing, immediately before or after thereof and digitalized, from first image data, which is captured by
an ordinary capturing mode with the shutter opened and digitalized;
adder means for adding an offset, for negative noise, to a signal value from said subtraction means;
limiter means for limiting a signal level from said adder means;
bright spot position detection means for detecting an occurrence position of a bright spot noise, which is a high level noise
which produces a bright spot on a captured image, in said second image data; and
noise compensation means for compensating for data of a pixel corresponding to the occurrence position of said bright spot
noise detected by said bright spot position detection means, with respect to output data from said limiter means, wherein:
said bright spot position detection means comprises detecting the occurrence position of said bright spot noise if a signal
level of said pixel reaches a predetermined value.
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