Method and apparatus for radon transformation and angular correlation in optical processors
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United States of America Patent
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Mar 31, 1992
Grant Date -
N/A
app pub date -
Dec 13, 1990
filing date -
Dec 13, 1990
priority date (Note) -
Expired
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Abstract
A method and electro-optical apparatus for generating the Radon transform and angular correlation of input images using optical signal processing techniques is disclosed. In the preferred embodiment, video feedback of raster scanned images is utilized to perform the Radon transform and angular correlation separately or in combination. The basic video feedback architecture implements angular rotation of the input image via successive passes through a video feedback loop in which the feedback focal plane array is rotated by a fixed amount relative to the input/feedback miniature display unit. Subsequently, the Radon transform is derived by using anamorphic output optics, which image the Radon transform onto a linear self-scanned detector array. By projecting the rotated feedback image through a two-dimensional spatial light modulator, such as a liquid crystal television having a transmittance proportional to the intensity pattern of the unrotated input image, angular correlation is obtained by focusing the output light from the spatial light modulator onto a single photodetector using a spherical lens.
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