%0 Conference Proceedings %F Marchand07b %A Marchand, E. %T Control camera and light source positions using image gradient information %B IEEE Int. Conf. on Robotics and Automation, ICRA'07 %P 417-422 %C Roma, Italy %X In this paper, we propose an original approach to control camera position and/or lightning conditions in an environment using image gradient information. Our goal is to ensure a good viewing condition and good illumination of an object to perform vision-based task (recognition, tracking, etc.). Within the visual servoing framework, we propose solutions to two different issues: maximizing the brightness of the scene and maximizing the contrast in the image. Solutions are proposed to consider either a static light and a moving camera, either a moving light and a static/moving camera. The proposed method is independent of the structure, color and aspect of the objects. Experimental results on both synthetic and real images are finally presented %U http://rainbow-doc.irisa.fr/pdf/2007_icra_marchand_light.pdf %U http://dx.doi.org/10.1109/ROBOT.2007.363822 %8 April %D 2007