12 May 2006 New high-dynamic-range camera architecture
Author Affiliations +
The need for high (wide) dynamic range cameras in the Security and Defense sectors is self-evident. Still the development of a cost-effective and viable system proves to be an elusive goal. To this end we take a new approach which meets a number of requirements, most notably a high "fill" factor for the associated APS (active pixel sensor) array and a minimal technology development curve. The approach can be used with any sensor array technology supporting, on a granular level, random pixel access. To achieve high dynamic range one of the presented camera systems classifies image pixels according to their probable brightness levels. Then it scans the pixels according to their probable brightness, with the pixels most likely to be the brightest being scanned first and the pixels most likely to be the darkest, last. Periodically the system re-adjusts the scanning strategy based on collected data or operator inputs. The overall exposure time is dictated by the sensitivity of the selected array and by the content and frame rate of the image. The local exposure time is determined by the predicted pixel brightness levels. The prediction method we use in this paper is simple duplication; i.e. the brightness of the vast majority of pixels is assumed to change little from frame to frame. This allows us to dedicate resources only to the few pixels undergoing large output excursions. Such approach was found to require only minimal modifications to standard APS array architectures and less "off-sensor" resources than CAMs (Content Addressable Memory) or other DSP intensive methods.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Andrei Cernasov "New high-dynamic-range camera architecture", Proc. SPIE 6246, Visual Information Processing XV, 624608 (12 May 2006); doi: 10.1117/12.666573; https://doi.org/10.1117/12.666573


Frameless representation and manipulation of image data
Proceedings of SPIE (March 03 2015)
NV-CMOS HD camera for day/night imaging
Proceedings of SPIE (June 08 2014)
High dynamic range adaptive real time smart camera an...
Proceedings of SPIE (April 29 2015)
Real-time implementation of image alignment and fusion
Proceedings of SPIE (December 05 2004)
BLINC a 640x480 CMOS active pixel video camera with...
Proceedings of SPIE (May 14 2001)
Video-based sensor for tracking three-dimensional targets
Proceedings of SPIE (January 30 2001)

Back to Top