Distilling image character is based on image edge detection. Image edge has become the important character to pattern recognition, vision of computer, homing etc. And it has been paid more attention, which has broad use.In this paper, three aspect that is theory discussion, algorithms realization and applications are introduced, which aim at edge detection in distilling image character. All kind of methods which are widely used in image edge detection are presented by author. Multiwavelet transform as a new...