Temporal photoreception for adaptive dynamic range image sensing and encoding

✍ Scribed by Vladimir M. Brajovic; Ryohei Miyagawa; Takeo Kanade

• Book ID: 104348890
• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 953 KB
• Volume: 11
• Category: Article
• ISSN: 0893-6080
• DOI: 10.1016/s0893-6080(98)00070-7

✦ Synopsis

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 1:128 000. 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 1:1 000 000. Both implementations can operate at standard video rate of 30 frames s ¹1 .