1. A caricature generating system, comprising: an image acquisition unit capturing a facial image; a feature detecting unit identifying and positioning the features of the facial image; an edge-tracing and stroking unit detecting the contours of the facial image and converting the facial image into an outline image with artistic stroking styles; a posterizing and texturing unit posterizing the continuous tone of the facial image and converting the facial image into a texture image with various texture filling styles; and an image blending unit blending the outline image and the texture image to synthesize a hand drawing-like cartoon image.