Journal ArticleDOI
Walsh Functions in Lens Optimization: II. Evaluation of the Diffraction-based OTF for On-axis Imagery
P. K. Purkait,L. N. Hazra,M. De +2 more
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This article is published in Journal of Modern Optics.The article was published on 1981-03-01. It has received 2 citations till now. The article focuses on the topics: Lens (optics).read more
Citations
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Journal ArticleDOI
Far-field diffraction properties of radial Walsh filters
Lakshminarayan Hazra,A. Guha +1 more
TL;DR: In this paper, a set of orthogonal radial filters for the pupil of an imaging system is presented, with analytical expressions for members of the set and their Hankel transforms of order zero.
Journal ArticleDOI
Numerical evaluation of a class of integrals for image assessment.
TL;DR: A new quadrature technique is presented that obviates the need for knowledge of derivatives of the argument of the exponential integrand in the calculation of image assessment critiera.
References
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Journal ArticleDOI
The Application of Frequency Response Techniques in Optics
TL;DR: In this article, a resume of the treatment of image formation from the standpoint of the theory of passive linear systems is given, it being shown that image formation for an incoherent object satisfies the basic postulates of superposition and stationarity.
Journal ArticleDOI
A New 'Analytic' Method for Computing the Optical Transfer Function
Eric C. Kintner,R.M. Sillitto +1 more
TL;DR: Using a series expansion in Zernike polynomials to express the pupil function of an optical system, a means for computing the Optical Transfer Function has been found which avoids explicit numerica as discussed by the authors.
Journal ArticleDOI
The Calculation of the Optical Transfer Function
TL;DR: In previous OTF computer programs, various geometrical optical aspects of image formation appear often to have been ignored, leading to considerable errors in the computed values of the transfer function, particularly for high-aperture or wide-angle systems.
Journal ArticleDOI
Walsh Functions in Problems of Optical Imagery
M. De,Lakshminarayan Hazra +1 more
TL;DR: A reformulation of Walsh functions in polar coordinates facilitates the analysis which is presented, along with a restatement of the basic properties of these functions pertinent to the purpose.
Journal ArticleDOI
The Calculation of the Optical Transfer Function Using Gaussian Quadrature
TL;DR: In this paper, a Gaussian quadrature-based program for the calculation of the optical transfer function (OTF) using symmetry considerations is described. But the program uses considerations of symmetry to save computer time, and several means of checking intermediate results are described.