In our fast going life, digital cameras and smart phones have been widely used to acquire photographs. In fact, digital cameras and smart phones have a limited dynamic range, which is very much lower than that our eyes can perceive. So, the pictures taken in high dynamic range scenes often exhibit under-exposure or overexposure artifacts in shadow or highlight regions. Here, an image fusion based approach, called classified exposure image fusion, is proposed for enhancement of image. First, a function following the F-stop concept in photography is designed to generate several pseudo images...