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Technical note: Signal resolution increase and noise reduction in a CCD digitizer
Author(s) -
González A.,
Martı́nez J. A.,
Tobarra B.
Publication year - 2004
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.1644672
Subject(s) - noise reduction , noise (video) , reduction (mathematics) , resolution (logic) , signal to noise ratio (imaging) , signal (programming language) , computer science , physics , optics , acoustics , artificial intelligence , mathematics , geometry , programming language , image (mathematics)
Increasing output resolution is assumed to improve noise characteristics of a CCD digitizer. In this work, however, we have found that as the quantization step becomes lower than the analog noise (present in the signal before its conversion to digital) the noise reduction becomes significantly lower than expected. That is the case for values of σ an/ Δ larger than 0.6, where σ anis the standard deviation of the analog noise and Δ is the quantization step. The procedure is applied to a commercially available CCD digitizer, and noise reduction by means of signal resolution increase is compared to that obtained by low pass filtering.