LIP operators: Simulating exposure variations to perform algorithms independent of lighting conditions

Logarithmic Image Processing (LIP) Model consists of a mathematical and physical framework dedicated to image processing. In this paper, a novel application of LIP operators is presented: we explain how LIP addition and subtraction can be used to simulate a variation of sensor sensitivity or changes in source intensity depending on the transmitted or reflected imaging context. Such a property generates an interesting result on another LIP operator: the LIP additive contrast is independent of brightness variations, due to exposure time modification for instance. The results are presented through different image processing techniques like image enhancement, contour detection and a lot of other possible applications.