IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS—II: ANALOG AND DIGITAL SIGNAL PROCESSING, VOL. 45 , NO. 12, DECEMBER 1998
OBJECT-BASED SELECTION WITHIN AN ANALOG VLSI VISUAL ATTENTION SYSTEM
MORRIS, T., HORIUCHI, T., DEWEERTH, S.
An object-based analog very large-scale integration (VLSI) model of selective attentional processing has been implemented using a standard 2.0-mm CMOS process. This chip extends previous work on modeling a saliency-map-based selection and scanning mechanism to incorporate the ability to group pixels into objects. This grouping, or segmentation, couples the circuitry of the object’s pixels to act as a single, larger pixel. The grouping of pixels is dynamic, driven solely by the segmentation criterion at the input. In this demonstration circuit, image intensity has been chosen for the input saliency map and the segmentation is based on spatial low-pass filtering followed by an intensity threshold. We present experimental results from a one-dimensional implementation of the object-based analog VLSI selective-attention system.
Keywords: Focal-plane processing, neuromorphic analog VLSI, object segmentation, subthreshold circuits, visual attention, winner-take-all.