Image enhancement with Green function

Due to the uncomfortable visual effect which was caused by traditional image enhancement algorithms, this paper proposes an effective image enhancement algorithm. Firstly, the digital image was divided into circular regions and the Dirichlet boundary conditions were calculated by adaptive luminance mapping. Secondly, the Poisson equation in gradient domain was obtained according to the information for each region. At last, we employed the method of image to get the solution of Possion equation. By making comparison with other algorithms, the experimental result shows that our algorithm improves the visual effect effectively.