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Real-time single-exposure ROI-driven HDR adaptation based on focal-plane reconfiguration

AuthorsFernández-Berni, J. ; Carmona-Galán, R. ; Río, Rocío del; Kleihorst, R.; Philips, Wilfried; Rodríguez-Vázquez, Ángel
KeywordsViola-Jones algorithm
Smart imaging
Sensing-processing arrays
Mixed-signal circuitry
Haar-like features
OpenCV library
Integral images
Issue Date2015
PublisherThe International Society for Optics and Photonics
CitationProc. SPIE 9400, Real-Time Image and Video Processing 2015, 94000K (February 27, 2015)
AbstractThis paper describes a prototype smart imager capable of adjusting the photo-integration time of multiple regions of interest concurrently, automatically and asynchronously with a single exposure period. The operation is supported by two intertwined photo-diodes at pixel level and two digital registers at the periphery of the pixel matrix. These registers divide the focal-plane into independent regions within which automatic concurrent adjustment of the integration time takes place. At pixel level, one of the photo-diodes senses the pixel value itself whereas the other, in collaboration with its counterparts in a particular ROI, senses the mean illumination of that ROI. Additional circuitry interconnecting both photo-diodes enables the asynchronous adjustment of the integration time for each ROI according to this sensed illumination. The sensor can be reconfigured on-the-fly according to the requirements of a vision algorithm. © (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Publisher version (URL)http://dx.doi.org/10.1117/12.2078356
Appears in Collections:(IMSE-CNM) Comunicaciones congresos
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