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SNRstandard is often a poor representation of scene appearance because it is strongly affected by the slope of S with respect to Lscene ( dS/dLscene), which is often not constant over the range of L. For example, the slope is reduced in the “shoulder” region. A low value of the slope will result in a high value of SNRstandard that doesn’t represent the scene. 

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isMissingRequiredParameterssnrref
truesnrref
To remedy this situation we define a scene-referenced noise, Nscene-ref, that gives the same SNR as the scene itself: SNRscene = Lscene / Nscene. The resulting SNR = SNRscene-ref is a much better representation of the scene appearance. 

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