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A QCIF 145dB imager for focal plane processor chips using a tone mapping technique in standard 0.35μm CMOS technology

AuthorsVargas-Sierra, S. ; Liñán-Cembrano, G. ; Rodríguez-Vázquez, Ángel
Issue Date2011
CitationInternational Image Sensor Workshop (IISW-2011)
AbstractThis paper presents a QCIF HDR imager where visual informatioin is simultaneously captured and adptively compressed by means of an in-pixel tone mapping scheme. The tone mapping curve (TCM) is calculated from a non-linear histogram of the previous image, wich serves as a probability indicator of the distribution of illuminations within the present frame. The chip produces 7-bit/pixel images that can map illuminations from 311x10-6lux to 5875 lux in a single frame in a way that each pixel decides when to stop observing photocurrent integration -with exttreme values captured at 8s and 20μs respectively. Pixels use a 3x3μm2 Nwell-Psubstrate photodiode and an autozeroing technique for establishing the reset voltage, which cancels most of the offset contributions created by the analog processing circuitry. Measured sensitivity is 5.79 v/lux.s. Dark current effects in the final image are attenuated by an automatic programming of the DAC top voltage. The chip has been designed in the 0.35 μm OPTO technology from AMS.
DescriptionComunicación presentada al "International Image Sensor Workshop (IISW)" celebrado del 8 al 11 de Junio del 2011 en Hokkaido (Japón).
Appears in Collections:(IMSE-CNM) Comunicaciones congresos
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