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

Sensors

Antonio Martínez-Sánchez¹  Carlos Fernández²  Pedro J. Navarro² 

[1] Supercomputing and Algorithms Group, CSIC-UAL Associated Unit, University of Almeria, 04120 Almeria, Spain; E-Mail:;DSIE, Universidad Politécnica de Cartagena, Campus Muralla del Mar, s/n. E-30202 Cartagena, Spain; E-Mails:

关键词: adaptive control;    HDR imaging;    image sensors;    LinLog CMOS sensor;    outdoor vision;   

DOI  :  10.3390/s110908412

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2011 by the authors; licensee MDPI, Basel, Switzerland.