By using knife edge as object,and CMOS sensor as device for image analyzing,we get edge spread function from the image and use differential operation and FFT to obtain modulation transfer function of the lens,then its image quality is known.

• 以刀口作为目标物，以CMOS作为图像分析器件，从图像中获取刀口函数，经微分和FFT运算，得到成像镜头的MTF(调制传递函数)，从而得知其成像品质。