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US 7,804,532 B2Granted
Noise reducing device, electronic camera, and image processing program for reducing image noise by using blackout image
AssigneeNikon Corporation
InventorsKazuhiro Takahashi, Masahiro Suzuki, Daiki Ito
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Abstract
A noise reducing device captures image data obtained by capturing a field with an image capturing part and a plurality of blackout image data obtained by capturing the field with the image capturing part under a light shielded state. This device reduces non-correlative random noise in the plural blackout image data. With random noise reduced, fixed pattern noise appears more accurately in resultant as blackout image data B. This device reduces the fixed pattern noise in the image data by using this blackout image data B.
Claims6
A noise reducing device comprising:
- an input part that captures image data and a plurality of blackout image data, the image data being obtained by capturing an optical image with an image capturing part, the plurality of blackout image data being obtained by capturing the optical image with said image capturing part under a light shielded state after capturing the image data;
- a blackout image processing part that reduces non-correlative random noise in the plural blackout image data to generate blackout image data B;
- and
- a noise reducing part that reduces noise in said image data according to the blackout image data B;
- wherein
- when a total charge storage time for the plural blackout image data is set shorter than a charge storage time for the image data, said blackout image processing part multiplies the blackout image data B by a compensation gain which compensates gain decrease of a fixed pattern noise ascribable to the set shorter time.
3 more elements
Dependencies are inferred from the claim text.