NDLI: Image Evaluation Techniques in Visible and Infrared Regions

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Image Evaluation Techniques in Visible and Infrared Regions

Content Provider	Springer Nature Link
Author	Datta, P. K.
Copyright Year	2005
Abstract	Image evaluation of an optical system, both in visible and infrared region, may be based upon a mathematical model before the system has been actually constructed. Additionally/alternatively, the evaluation coule be an experimental one, where the sample is physically available.In the mathematical model, from the various lens parameters, the distribution of rays in the neighbourhood of an image point can be found out, which is known as geometrical interpretation. Secondly the evaluation may be based on computation of contour map of the emergent wavefront and determining the departure from the desired wavefront. Thirdly, the distribution of intensity in the diffraction pattern may be computed.In the physical model, the experimental method which is analogous to geometrical interpretation is the Hartman test and its variations by which the geometrical paths of the rays are determined. The idea of emergent wavefront can be obtained from the interferometry test. The distribution of energy within the diffraction pattern may be measured by scanning method or its variations.Depending on the types of applications, the image sensor could be eye, film, image intensifier, camera tube or a thermal detector and the final image could be viewed directly by an eye or could be first displayed on a video monitor before presenting to the eye. When the eye is the only sensor, measurement of MTF alone would be an execellent tool for describing the overall performance of the system. However, in the visible region, when some intermediate detectors are used, the MTF data have to be supplemented with the Demand Modulation Function (DMF) in order to have a complete analysis of the imagery. The intersection of the MTF and DMF curves gives the limiting spatial frequency of the complete system and the Modulation Transfer Function Area (MTFA) i.e., the area bounded within the origin by the MTF curve, DMF curve and the limiting spatial frequency could be described as the single number figure of merit of the system. For thermal detectors in infrared region, the equivalence of DMF data are the MRTD values at different spatial frequencies.In the present paper, it has been endeavoured to project a brief overview of the various image evaluation techniques, in both visible and infrared regions, for various optical and electro-optical systems.
Starting Page	115
Ending Page	139
Page Count	25
File Format	PDF
ISSN	09728821
Journal	Journal of Optics
Volume Number	34
Issue Number	3
e-ISSN	09746900
Language	English
Publisher	Springer India
Publisher Date	2015-04-30
Publisher Place	New Delhi
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Physics Laser Technology, Photonics Optics, Optoelectronics, Plasmonics and Optical Devices
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics

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