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Analog Image Processing in Two Dimensions by Omnidirectional Scanning

National Institute of Radiological Sciences, Anagawa, Chiba-shi, Japan

Correspondence: For reprints contact: N. Nohara, Division of Physics, National Institute of Radiological Sciences, 9-1, 4-chome, Anagawa, Chiba-shi, Japan.

ABSTRACT

A new method of two-dimensional image processing by analog techniques is introduced. The original image stored on a film is rescanned by a flying spot scanner with a special raster, so-called omnidirectional scanning, by which the film is scanned in any direction with constant speed and with uniform scan-line density. The extracted image information is fed through an electronic filter to a display CRT. The asymmetric impulse response of the filter can be canceled out by superposition of video signals in all directions on the screen of the CRT. Therefore two-dimensional image processing can be accomplished with the one-dimensional filter. The preliminary processor was constructed and tested for phantom images obtained with a scintillation camera.