说明：  数字图像处理，设计并分别应用罗伯茨梯度、拉普拉斯算子、Sobel算子、Prewitt算子、Isotropic算子对图象进行锐化操作，达到图象锐化效果。
(Digital image processing, design and application respectively, Laplace operator Roberts gradient, Sobel operator, Prewitt operator, Isotropic operators on image sharpen operation, achieve image sharpen effect.)