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Journal of Electronic Imaging • Open Access

Blemish detection in camera production testing using fast difference filtering
Author(s): Leena Lepistö; Jarno Nikkanen; Matti Suksi

Paper 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.

Paper Details

Date Published: 1 April 2009
PDF: 3 pages
J. Electron. Imaging. 18(2) 020501 doi: 10.1117/1.3132004
Published in: Journal of Electronic Imaging Volume 18, Issue 2
Show Author Affiliations
Leena Lepistö, Nokia Research Ctr. (Finland)
Jarno Nikkanen, Nokia Research Ctr. (Finland)
Matti Suksi, Nokia Research Ctr. (Finland)


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