Image input apparatus having addition and subtraction processing
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United States of America Patent
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Apr 4, 2006
Issued Date -
N/A
app pub date -
May 14, 2001
filing date -
May 16, 2000
priority date (Note) -
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Abstract
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 A1. The shutter is then closed, and the accumulation mode is set to acquire subtraction data between the image data and black image data A2. This processing is repeated to acquire image data A1 and subtraction data A2, and these subtraction data are added. These operations A1, A2, and A3 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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