At the same time,the edges of image always are obscured because of noises in image capturing process.So it is pop all along to study on the edge detection technique of digital image.

• 同时,图像获取过程中受到各种噪声的影响,必然会引起图像边缘的模糊,因此对图像边缘提取技术的研究一直是一个热门。