图像增强技术在工业、国防和科学研究等部门都有重要的应用，其中用光学方法实现图像增强更具有它独特的优点。自激光出现以后，人们便把它作为一种理想光源，发展了各种相干 Image enhancement technology in industry, defense and scientific research and other departments have important applications, including the use of optical methods to achieve image enhancement has its unique advantages. Since the advent of lasers, people have used it as an ideal source of light, developing a variety of coherence