应用视觉保真度（ＶＩＦ）的方法对图像增强方法的优劣做客观的评价。从而达到用客观的评价方法评价一种增强方法的优劣性。-The application of visual fidelity (VIF) to do an objective evaluation of the pros and cons of the image enhancement method. So as to achieve an enhanced method of objective evaluation methods