Depth information extraction of the image defocus area based on frequency domain

This paper presents a depth extraction method based on frequency domain to process the image defocus area-the region can be treated as a degradation model by using optical principle, point spread function (PSF) and Hough transform. The key point is the radius of circle of confusion, to obtain which we proposed two innovation points: an approach for estimating PSF parameters based on Hough Transform; a degradation model for expressing the image defocus area. A detailed analysis of experimental data is taken while the relative error is obtained, according to that we conclude that the algorithm can relatively accurately extract the depth information.