Acquisition Of Characteristics Of Simple Images By Using A Novel Technique Based On Lateral Interferometry

Sandor Holly

doi:10.1117/12.954065

1 March 1975 Acquisition Of Characteristics Of Simple Images By Using A Novel Technique Based On Lateral Interferometry

Sandor Holly

Proceedings Volume 0048, Acquisition and Analysis of Pictorial Data; (1975) https://doi.org/10.1117/12.954065
Event: Acquisition and Analysis of Pictorial Data, 1974, San Diego, United States

Abstract

A novel method to identify simple shapes defined by straight line segments is described. The Atlantic Research Corporation technique uses a laterally moving optical fringe pattern that is generated by two laser beams, converging at a small angle. The two laser beams are identical in intensity derived from the same laser by using a Bragg cell as a beamsplitter. One of the two laser beams is shifted in frequency by an amount, determined by the ultrasonic frequency of the Bragg cell, which causes the fringes to move in a direction perpendicular to their plane. In addition, the shifting fringe pattern is continuously rotated about the bisector of the two converging beams. Transmitted (or scattered) radiation is detected, the RF component amplified and displayed on an oscilloscope, providing an angular spectrum of the image. In the case of a triangle for example, made up of 3 lines (or 3 slits on an otherwise opaque negative plate), the acquired spectrum consists of 3 vertical lines displayed along the base line. A detailed description of the method is presented, including experimental data. In conclusion, the paper describes interesting application areas.

Citation Download Citation

Sandor Holly "Acquisition Of Characteristics Of Simple Images By Using A Novel Technique Based On Lateral Interferometry", Proc. SPIE 0048, Acquisition and Analysis of Pictorial Data, (1 March 1975); https://doi.org/10.1117/12.954065

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