Definition: The contrast-to-noise ratio (CNR) is the detection sensitivity per sampling unit. In the context of fNIRS, this can refer to the ratio of the amplitude variation
of a hemodynamic response to the level of noise
in the data, i.e. CNR =
or in the context of general image data analysis, it can refer to the average signal/intensity recovered in a selected region-of-interest (ROI) subtracting that of the background region, and divided by the spatial variations of the recovered image data in either the background or ROI.
Category: Analysis
Related terms: signal-to-noise ratio, noise
Abbreviation or symbol: CNR
Synonym:
References: https://doi.org/10.1117/1.NPh.8.1.012101https://doi.org/10.1117/1.1852553
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Davies, E. R. (2004). Machine vision: theory, algorithms, practicalities. Elsevier.
Digital Image Processing (3rd Edition)February 2006. Gonzalez and Woods. Prentice-Hall
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