Special Section on Image Quality

Analysis and assessment of the effects of fixed pattern and quantization noise on the accuracy of color rendition in wide-dynamic-range complementary metal-oxide semiconductor imagers

[+] Author Affiliations
Stephen O. Otim

Oxford University, Department of Engineering Science, OX1 3PJ, United Kingdom

Steve Collins

Oxford University, Department of Engineering Science, OX1 3PJ, United Kingdom

J. Electron. Imaging. 19(1), 011011 (January 08, 2010). doi:10.1117/1.3272597
History: Received April 13, 2009; Revised August 10, 2009; Accepted September 21, 2009; Published January 08, 2010
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For wide-dynamic-range cameras that achieve a logarithmic response using a load transistor operating in weak inversion, fixed pattern noise is a particular problem. The effects of fixed pattern noise can be reduced using one of a variety of methods that compensate for different forms of fixed pattern noise. In choosing between these methods, it becomes important to know the level of fixed pattern noise that is tolerable for the application in question. Similarly, when deciding on the number of bits that should be used when digitizing the image, it is important to know the level of quantization noise that is tolerable to maintain color image quality. In this work, a method of determining the tolerable levels of fixed pattern and quantization noise is proposed. This leads to the conclusion that for one type of wide-dynamic-range pixel, a relatively simple fixed pattern noise correction procedure gives acceptable results for applications of medium complexity. A more generally applicable result is that if quantization levels equivalent to a contrast change of less than 2% in logarithmic imagers are obtainable, then excellent color image rendition can be achieved.

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Citation

Stephen O. Otim and Steve Collins
"Analysis and assessment of the effects of fixed pattern and quantization noise on the accuracy of color rendition in wide-dynamic-range complementary metal-oxide semiconductor imagers", J. Electron. Imaging. 19(1), 011011 (January 08, 2010). ; http://dx.doi.org/10.1117/1.3272597


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