Figure 4

Comparison of radiographs before and after anisotropic diffusion. In this figure, a child's left hand bone radiograph is used to demonstrate the anisotropic diffusion effect: (a) Hand radiograph image before diffusion (b) Hand radiograph image after diffusion. As the result presents, the bone area has been smoothed to become homogenous area; the black holes and dots in have been filled by similar pixel intensity with the surrounding bone. Despite this filtering process, the edges of hand structure are preserved and can be clearly seen.