Optimum detectors for artificial object recognition
Lead Research Organisation:
University of Oxford
Department Name: Engineering Science
Abstract
Current digital cameras have a linear response and are only really suitable for simple picture imaging under controlled light conditions. In fact compared to human vision these cameras have two critical and debilitating limitations, a limited dynamic range and variability in object colour. The first of these limitations causes saturation when the dynamic range of a scene is larger than that of the camera. The second limitation is subtler and means that unlike human vision it is difficult to use colour information from linear cameras in artificial object recognition systems. Both these limitations can be overcome using pixels with a relatively narrow spectral response and an output that is proportional to the logarithm of the detected photocurrent. We intend to overcome these limitations by developing a new camera technology based upon organic photodiodes and a logarithmic response.
Organisations
People |
ORCID iD |
Steve Collins (Principal Investigator) | |
Paul Burn (Researcher) |
Publications
Cheng H
(2007)
A High-Dynamic-Range Integrating Pixel With an Adaptive Logarithmic Response
in IEEE Photonics Technology Letters
Cheng H
(2009)
An Integrating Wide Dynamic-Range Image Sensor With a Logarithmic Response
in IEEE Transactions on Electron Devices
Jansen Van Vuuren R
(2010)
Determining the absorption tolerance of single chromophore photodiodes for machine vision
in Applied Physics Letters
Ratnasingam S
(2011)
Extending "color constancy" outside the visible region.
in Journal of the Optical Society of America. A, Optics, image science, and vision
Das D
(2013)
Fixed-Pattern-Noise Correction for an Integrating Wide-Dynamic-Range CMOS Image Sensor
in IEEE Transactions on Electron Devices
Ratnasingam S
(2010)
Optimum sensors for color constancy in scenes illuminated by daylight.
in Journal of the Optical Society of America. A, Optics, image science, and vision
Ratnasingam S
(2010)
Study of the photodetector characteristics of a camera for color constancy in natural scenes.
in Journal of the Optical Society of America. A, Optics, image science, and vision