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A Comparison of Halftoning-Inspired Methods for Foveation in Variable-Acuity Cameras

By Thayne Coffman


Our objective is to compare how different halftoning-inspired approaches perform at generating the binary control signal used by Variable Acuity Superpixel Imager (VASI) foveating cameras, in the context of automatic target acquisition and recognition (ATA/ATR) applications. To compare performance, we foveate a small set of test images with a variety of halftoning-inspired approaches and then measure five objective figures of merit (FOMs). We explore seven standard halftoning variations and two specialized methods of our own design (also presented) named vasiHalftone and vasiHalftone2. Our control signal generation approaches require an inverse function operation to counteract the effects of the pixel geometries produced by each particular halftoning approach, as explained in the paper. We find that the vasiHalftone and vasiHalftone2 approaches provide superior FOM values but are unable to accurately produce a target bandwidth reduction, making them unsuitable for use with VASI cameras. Floyd and Steinberg error diffusion is found to give the best FOM values while allowing precise bandwidth control. Other halftoning approaches are characterized by inferior FOM values, inferior bandwidth control, or both

Year: 2009
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