| 摘要 |
Image data having a high S/N ratio is obtained even when the exposure time is relatively long. To achieve the above object, there is provided an image input apparatus in which an accumulation mode is set with the shutter open, thereby acquiring image data A 1 . The shutter is then closed, and the accumulation mode is set to acquire subtraction data between the image data and black image data A 2 . This processing is repeated to acquire image data A 1 and subtraction data A 2, and these subtraction data are added. These operations A 1, A 2, and A 3 are repeated a predetermined number of times to update addition data, and image processing is performed on the basis of the updated addition data.
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