In a triangular path cyclic interferometer employing a polarizing beam splitter (PBS), the two counter-propagating beams are orthogonally polarized. A sample placed almost equidistant from the PBS is imaged by a lens placed in the path of the emerging beams so that two defocused images of the sample are recorded on a CCD. Using a linear polarizer in the path of the orthogonally polarized imaging beams, it is possible to achieve amplitude subtraction between the two images, resulting in an edge-enhanced image of the sample. The proposed real-time edge-enhancement technique is experimentally demonstrated. © 2014 Optical Society of America.

KALLOL BHATTACHARYA

Applied Optics and Photonics

S CHAKRABORTY

University of Calcutta (informally known as Calcutta University or CU) is a collegiate public state university located in Kolkata, West Bengal, India.&nbsp;Within India it is recognized as a &quot;Five-Star University&quot; and accredited &quot;A&quot; Grade by National Assessment and Accreditation Council.

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The University of Calcutta has secured the Fifth position among the Universities of India in the prestigious &quot;Indian University Ranking 2019&quot; list, released by the NIRF of the Ministry of Human Resource Development, Government of India.

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It was established on 24 January 1857, and was one of the first institutions in Asia to be established as a multidisciplinary and Western-style university. Its alumni and faculty include several heads of state, heads of government, social reformers, prominent artists, only academy award winner and Dirac medal winner in India, many Fellows of the Royal Society and five Nobel laureates as of 2019 which is highest in South Asia.

University Of Calcutta

Real-time edge detection by cyclic-path polarization interferometer

Applied Optics

It is well known that a suitably shaped birefringent material, placed between two polarizers, exhibits a spatial variation in amplitude transmittance. The present article explores the possibility of using such an arrangement as a spatial frequency filter. The advantage of such filters is that the nature of filtering achievable can be changed by rotating any of the two polarizers. The specific case of a biconvex quartz lens as a spatial frequency filter is considered and techniques for real-time edge enhancement and periodic noise removal are discussed. Experimental results are also presented. © 1994 Taylor and Francis Ltd.

Journal of Modern Optics

Optical processing using a birefringence-based spatial filter

The present article reports a new optical method for achieving high frequency enhancement utilising polarisation technique. A birefringent lens is used for producing two images of the test transparency with different amount of defocus on a grating which are subsequently subtracted by optical means. Some experimental results are presented. © 1982.

Journal	Data powered by TypesetApplied Optics
Publisher	Data powered by TypesetOSA - The Optical Society
ISSN	1559-128X
Impact Factor	1.230
Open Access	No
Citation Style	unsrt
Sherpa RoMEO Archiving Policy	Green