Shadow removal in gradient domain

Shadow removal is of significance in computer vision. Shadow usually adheres to texture, and it is difficult to decouple shadow from texture without any assumptions. In this paper, we suppose that the texture beneath shadow should bear the similar patterns, which makes the problem of simultaneously recovering the reflectance and light attenuation factor solvable with sole image. A novel shadow removal method is proposed, which is fulfilled by complementing the lost radiance in shadow region. Experiments show that our proposed approach could maintain the texture structure and the coherent lighting with the intact region.