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1 April 2009 Blemish detection in camera production testing using fast difference filtering
Leena Lepistö, Jarno Nikkanen, Matti Suksi
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Journal of Electronic Imaging, Vol. 18, Issue 2, 020501 (April 2009). https://doi.org/10.1117/1.3132004
Abstract
In the camera manufacturing, special methods are needed to detect blemishes occurring on the camera sensor pixels. A blemish is referred as a region of pixels in the camera sensor that are somewhat darker than the background. The blemishes are difficult to detect accurately, but on the other hand, they cause a significant reduction in camera quality. We present a novel filtering method for the blemish detection. The method is based on image scaling, filtering, and difference image calculation that is very fast and accurate in the detection of blemishes. In addition, the algorithm can cope with unprocessed raw image data, in which various distortions, such as noise and vignetting, can be present.
©(2009) Society of Photo-Optical Instrumentation Engineers (SPIE)
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Leena Lepistö, Jarno Nikkanen, and Matti Suksi "Blemish detection in camera production testing using fast difference filtering," Journal of Electronic Imaging 18(2), 020501 (1 April 2009). https://doi.org/10.1117/1.3132004
Published: 1 April 2009
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Cited by 1 scholarly publication and 1 patent.
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KEYWORDS
Image filtering
Cameras
Sensors
Vignetting
Digital filtering
Optical filters
Inspection
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