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A 148dB focal-plane tone-mapping QCIF imager


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Opened Access A 148dB focal-plane tone-mapping QCIF imager

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Author: Vargas Sierra, Sonia
Liñán Cembrano, Gustavo
Rodríguez Vázquez, Ángel Benito
Department: Universidad de Sevilla. Departamento de Electrónica y Electromagnetismo
Date: 2012
Published in: IEEE International Symposium on Circuits and Systems (ISCAS), 1616-1619
ISBN/ISSN: 978-1-4673-0218-0
Document type: Presentation
Abstract: This paper presents a QCIF HDR imager where visual information is simultaneously captured and adaptively compressed by an in-pixel tone-mapping scheme [1]. The tone mapping curve (TMC) is calculated from the histogram of an auxiliary previous image, which serves as a probability indicator of the distribution of illuminations within the current frame. The chip maps 148dB scenes onto 7-bit/pixel coding, containing illuminations from 2.2mlux (SNR10) to 55.33klux -with extreme values captured at 8s and 2.34µs, respectively. Pixels use an Nwell-Psubstrate photodiode and autozeroing for establishing the reset voltage. Measured sensitivity is 5.79 V over lux·s. Dark current effects in the final image are attenuated by an automatic programming of the DAC levels. The chip has been fabricated in the 0.35µm OPTO technology from AMS.
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