1. An image processing method for boundary resolution enhancement, comprising steps of: transferring an image into an image layer; removing noise of said image layer by using a bilateral filter to generate a resolution image layer; and performing a gradient analysis of said resolution image layer by using a sharpness filter to remove at least one unbalance boundary of said resolution image layer and then to generate a sharpened image layer, and interpolating said sharpened image layer by using an interpolation filter to generate a high resolution image layer.