METHOD FOR DETECTING STREAK NOISES IN DIGITAL IMAGE
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United States of America Patent
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Issued Date -
Jul 5, 2012
app pub date -
Aug 18, 2011
filing date -
Dec 31, 2010
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A method for detecting streak noises in a digital image including the following steps is provided. Firstly, an exposure value of a camera is decreased, and a digital image is captured under exposure with a homogeneous background light source by the camera. Secondly, a circular region of interest (ROI) is extracted from the digital image. Next, projection values of the circular ROI corresponding to a plurality of rotation angles are calculated. Then, the projection values are respectively converted into amplitudes of the rotation angles. Afterwards, a maximum amplitude is found from the amplitudes. Finally, the maximum amplitude is compared with a threshold value to judge whether a streak noise exists in the digital image.
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