Journal
OPTICS EXPRESS
Volume 24, Issue 24, Pages 27280-27287Publisher
Optica Publishing Group
DOI: 10.1364/OE.24.027280
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The optical transfer function (OTF) is widely used to compare the performance of different optical systems. Conventionally, the OTF is normalized to unity for zero spatial frequency, but in some cases it is better to consider the unnormalized OTF, which gives the absolute value of the image signal. Examples are in confocal microscopy and image scanning microscopy, where the signal level increases with pinhole or array size. Comparison of the respective unnormalized OTFs gives useful insight into their relative performance. The significance of other properties of the general OTF is discussed. (C) 2016 Optical Society of America
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