1. A method for improving image sharpness, comprising: detecting each pixel of an image; labeling each pixel in the image as one of an edge/texture type and a non-edge/texture type; determining a type of pixel by classifying each labeled pixel as the edge/texture type as one of a border point type, a transition point type, and a peak point type; and using a shrinking/expanding filter to filter each border point type pixel, and subsequently using a high boost filter to first filter each peak point type pixel and then filter each transition point type pixel to sharpen the image.