title: Temporal photoreception for adaptive dynamic range image sensing and encoding.
abstract: We have implemented two analog VLSI computational sensors for sensing and encoding high dynamic range images by exploiting temporal dimension of photoreception. The first sensor is a multi-integration time photoreceptor that automatically adapts to use different integration periods depending on light intensity. It exhibits a dynamic range 128 times larger than that of a single integration period photoreceptor, approximately 1:128000. The second sensor is an intensity-to-time processing paradigm that is based on the notion that stronger stimuli elicit responses before weaker ones. The paradigm sorts pixels of sensed images by their intensities, thus achieving information-theoretic optimal encoding of images. It handles dynamic range of approximately 1:1000000. Both implementations can operate at standard video rate of 30framess(-1).
authors.affiliation: The Robotics Institute, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, USA
authors.forename: Vladimir M.
authors.initials: VM
authors.lastname: Brajovic
authors.forename: Ryohei
authors.initials: R
authors.lastname: Miyagawa
authors.forename: Takeo
authors.initials: T
authors.lastname: Kanade