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Sensors 2011, 11(9), 8412-8429; doi:10.3390/s110908412
Article

A Novel Method to Increase LinLog CMOS Sensors’ Performance in High Dynamic Range Scenarios

1
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2,* , 2
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Received: 28 July 2011 / Revised: 25 August 2011 / Accepted: 26 August 2011 / Published: 29 August 2011
(This article belongs to the Section Physical Sensors)

Abstract

Images from high dynamic range (HDR) scenes must be obtained with minimum loss of information. For this purpose it is necessary to take full advantage of the quantification levels provided by the CCD/CMOS image sensor. LinLog CMOS sensors satisfy the above demand by offering an adjustable response curve that combines linear and logarithmic responses. This paper presents a novel method to quickly adjust the parameters that control the response curve of a LinLog CMOS image sensor. We propose to use an Adaptive Proportional-Integral-Derivative controller to adjust the exposure time of the sensor, together with control algorithms based on the saturation level and the entropy of the images. With this method the sensor’s maximum dynamic range (120 dB) can be used to acquire good quality images from HDR scenes with fast, automatic adaptation to scene conditions. Adaptation to a new scene is rapid, with a sensor response adjustment of less than eight frames when working in real time video mode. At least 67% of the scene entropy can be retained with this method.
Keywords: adaptive control; HDR imaging; image sensors; LinLog CMOS sensor; outdoor vision adaptive control; HDR imaging; image sensors; LinLog CMOS sensor; outdoor vision
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Martínez-Sánchez, A.; Fernández, C.; Navarro, P.J.; Iborra, A. A Novel Method to Increase LinLog CMOS Sensors’ Performance in High Dynamic Range Scenarios. Sensors 2011, 11, 8412-8429.

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