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19 December 1985 An Object-Pass Filter For Image Processing
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An object-pass filter for image processing is defined as a filter that passes or enhances objects in an image that are larger than a minimum threshold and smaller than a maximum threshold. Objects outside the pass band, i.e. too large or too small, are suppressed by replacing the pixel gray scale level with zero. An object-pass filter that is realizable in today's technology is presented. It is shown that an object-pass filter can be realized with cascaded sort-selection filters, which select the Nth largest element in a neighborhood of elements. The object-pass filter's pass region can be determined by selecting the appropriate sort-selection filter window sizes. Due to recent advances in sort-selection filter architectures and VHSIC level technology, such an object-pass filter can be built using three of the recently developed Harris custom VHSIC Phase I level chips. Such a configuration can process imagery at a rate of better than 10 Mpixels/second. Simulation results are shown for object-pass filtering on binary images and also on several forward looking infrared images.
© (1985) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
J. Steven Mott and James A. Roskind "An Object-Pass Filter For Image Processing", Proc. SPIE 0575, Applications of Digital Image Processing VIII, (19 December 1985);

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