Abstract

A new technique for noise suppression has been designed and tested that allows detection of small and extremely low-contrast images. The procedure entails a double scan. A first scan is made with an aperture that provides about ten quantized levels (±2 sigma apart). Isolated spots are removed and the scene is rescanned with an aperture half the original diameter. Another quantization is performed, with the original quantization intervals, but only for points in the vicinity of object boundaries. The density values that can be assigned for these points are further restricted to those that occur in a surrounding region of that point, as determined by the primary scan.

© 1975 Optical Society of America

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