运用5种不同的梯度增强法进行图像锐化，图像的高通滤波和掩模处理，利用巴特沃斯（Butterworth）低通滤波器对受噪声干扰的图像进行平滑处理，利用巴特沃斯（Butterworth）高通滤波器对图像进行锐化处理-The use of five kinds of different gradient method to enhance image sharpening, image of the high-pass filtering and mask treatment, using Butte