基于傅里叶光学原理，建立了数值计算客观及主观激光散斑图样的方法.利用几何光学成像原理，推导了主观散斑现象中散斑及光斑漂移速率的表达式.搭建了成像实验装置，观察主客观散斑及其漂移现象. 结合相关函数、快速傅里叶变换算法以及卷积定理，建立了基于图像处理定量计算散斑及光斑漂移量的方法.实验结果、数值计算结果、几何光学理论均互相符合，表明了数值方法与几何光学理论的正确性，为激光散斑漂移现象提供了系统性的研究方法和直观的理解.

A numerical method of calculating objective and subjective laser speckle

patterns are developed based on the principles of Fourier optics. Expressions for the drift

velocities of laser speckle and light spot in a sub- jective pattern are derived based on

geometrical optical principles. Devices of imaging experiments are set up to ob- serve the

objective and subjective laser speckle patterns and their respective drift phenomena. Methods

to quantify the drift velocities of speckles and spots are established based on image processing

techniques，which combine cor- relation function，the Fast Fourier Transform algorithm and

convolution theorem. Both experimental and numerical results match perfectly with our

theoretical expressions，which validates the numerical method and geometrical opti- cal model. This

work provides a systematic method to research and an intuitive way to understand the laser speckle

drift phenomenon.