关键词: 图像增强, Retinex, 泊松方程, 格林函数, 梯度域, 电像法, 狄利克雷边界条件

Abstract: As the traditional image enhancement is suffered from uncomfortable details and visual effect, this paper proposes a new algorithm. The details are ensured by using Retinex model. The consistency in gradient domain between original image and restoration is guaranteed by solving the Poission equation. It adopts the adaptive luminance method to obtain the Dirichlet boundary condition. To reduce the complexity, boundary sampling method is executed. By making comparison with restorations, it shows that this algorithm effectively improves contrast, meanwhile the restorations represent excellent effect of sense.

Key words: image enhancement, Retinex, Poission equation, Green’s function, gradient domain, method of images, Dirichlet boundary condition