18 January 2010 On pixel detection threshold in the gigavision camera
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Recently, we have proposed a new image device called gigavision camera whose most important characteristic is that pixels have binary response. The response function of a gigavision sensor is non-linear and similar to a logarithmic function, which makes the camera suitable for high dynamic range imaging. One important parameter in the gigavision camera is the threshold for generating binary pixels. Threshold T relates to the number of photo-electrons necessary for the pixel output to switch from "0" to "1". In this paper, a theoretical analysis of the threshold influence in the gigavision camera is given. If the threshold in the gigavision sensor is large, there will be a "dead zone" in the response function of a gigavision sensor. A method of adding artificial light is proposed to solve the "dead zone" problem. Through theoretical analysis and experimental results based on synthesized images, we show that for high light intensity, the gigavision camera with a large threshold and added light works better than one with unity threshold. Experimental results with a prototype camera based on a single photon avalanche diodes (SPAD) camera are also presented.
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Feng Yang, Luciano Sbaiz, Edoardo Charbon, Sabine Süsstrunk, Martin Vetterli, "On pixel detection threshold in the gigavision camera", Proc. SPIE 7537, Digital Photography VI, 75370G (18 January 2010); doi: 10.1117/12.840015; https://doi.org/10.1117/12.840015

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