FIXED-RATIO ADAPTIVE THRESHOLDING USING CMOS CIRCUITS

A CMOS chip that thresholds an array of analogue inputs and produces a fixed-ratio, corresponding array of binary outputs has been designed and tested. By adapting the threshold level, the circuit maintains a d esired, selectable ratio of high-value to low-value outputs. This tech nique allows the primitive evaluation of quality in a sensory image th at is easily adjustable for different thresholding ratios and is resil ient to global offsets in the sensing environment.