The main lighting direction estimation for the uniform texture images

In this paper, a method for lighting directions estimation of the uniform texture images has been proposed. The proposed algorithm does not require training database, and only utilizes one input image for estimating the lighting directions. By detecting the largest direction of the brightness changes of the input image, the azimuth angle of the light source can be estimated. The slant angle is estimated by generating a random texture, whose density parameter and lighting directions are controllable. By comparing the intensity distribution between the input image and the generated texture, the slant angle can also be estimated.