Relations between Surface Gradient Maps in Frequency Domain and Application in Diffuse Component Detection

This paper examines the relationships between surface gradient maps in frequency domain and applies the relationships to detect the diffuse component using a set of images. In our method, we first assume the diffuse component can be expressed by the Lambertian model, and then we obtain a set of surface gradient pairs by selecting different pixel values produced by different illumination directions. We use the relation between surface gradient maps as a constraint to select the optimized surface gradient maps pair, which can be further used to obtain diffuse parameters. Experimental results based on real surface textures are presented.