1. A method for controlling an LCOS reflector in imaging system, proceeded by a computation processor dealing with an input image, comprising steps of: establishing a model describing the input image is a linear combination of a body reflection and an interface reflection, from objects; eliminating the minimum component of RGB for each pixel of the input image; adding a mean of a sum of the minimum RGB chromaticity of the pixels to the input image, and converting into a modified image; determining whether the difference between the input image and the modified image is greater/less than a threshold value to identify at least one highlight region and at least one non-highlight region in the input image; reconstructing color information of the at least one highlight region, by copying similar colors from a predetermined non-highlight area next to the at least one highlight region, and obtaining a reconstructed image considering as the body reflection; evaluating the weights of the body reflection and the interface reflection for the linear combination by the use of least-square estimation; eliminating the interface reflection term of the input image and considering the body reflection term as a reference image; and controlling the LCOS reflector to modify the input image according to the reference image.