| 摘要 |
A noise reduction apparatus of a digital camera which uses an imaging device for imaging a photographic subject, carries out a specified number of dark exposure operations, to obtain the same specified number of dark output values for each picture element of the imaging device, in which the photographic subject is imaged, under the condition where the imaging device is shaded, after a normal exposure operation in which the photographic subject is imaged. The apparatus calculates a representative value for each dark exposure operation, based on the dark output values. The apparatus calculates a ratio based on the representative values. The apparatus calculates noise components caused by the dark current in each picture element of the imaging device in the normal exposure operation on the basis of the ratio. The apparatus reduces the noise components from respective output values of each picture element, produced in the normal exposure operation.
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