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A Novel Method to Increase LinLog CMOS Sensors’ Performance in High Dynamic Range Scenarios
Supercomputing and Algorithms Group, CSIC-UAL Associated Unit, University of Almeria, 04120 Almeria, Spain
DSIE, Universidad Politécnica de Cartagena, Campus Muralla del Mar, s/n. E-30202 Cartagena, Spain
* Author to whom correspondence should be addressed.
Received: 28 July 2011; in revised form: 25 August 2011 / Accepted: 26 August 2011 / Published: 29 August 2011
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
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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.
Martínez-Sánchez A, Fernández C, Navarro PJ, Iborra A. A Novel Method to Increase LinLog CMOS Sensors’ Performance in High Dynamic Range Scenarios. Sensors. 2011; 11(9):8412-8429.
Martínez-Sánchez, Antonio; Fernández, Carlos; Navarro, Pedro J.; Iborra, Andrés. 2011. "A Novel Method to Increase LinLog CMOS Sensors’ Performance in High Dynamic Range Scenarios." Sensors 11, no. 9: 8412-8429.