So an edge detection method based on phase information is presented, which is more efficiency in detecting the NOSM image edges than the method based on intensity.

• 针对这种情况，本文提出采用基于相位信息的边缘检测方法，克服了基于图像强度信息进行边缘检测的不足，有效地提取了近场光学图像的边缘信息。