Temporal photoreception for adaptive dynamic range image sensing and encoding.
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).
Brajovic
Vladimir M.
VM
The Robotics Institute, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, USA
Miyagawa
Ryohei
R
Kanade
Takeo
T