Diffusion-Based Face Selective Smoothing in DCT Domain to Illumination Invariant Face Recognition

In this paper, a diffusion-based iterative algorithm is proposed for illumination invariant face representation using image selective smoothing in DCT domain. In fact, we split the image I into three parts (R+w)+L of an illumination invariant component, an oscillating component and a smooth component. At each iteration, the influence of different frequency sub-bands of image is determined and the additive oscillating component is reduced. The experimental results confirmed that our approach provides a suitable representation for overcoming illumination variations.