利用计算全息，提出了一种新的彩色全息图制作技术。给出了设计原理，实现了真彩色计算全息图的光学再现，对实验结果和相关问题进行了讨论。基于Matlab实现了这一种新的制作真彩色计算全息图的技术。得以下结果： 利用傅里叶变换平移不变性，可以解决三基色再现像的复位问题；利用真彩色计算全息图进行滤波再现，可提高再现像的质量； 利用傅里叶变换(FT)平移不变性，平行拼接多幅计算全息图，可有效地提高再现像强度；实现全息图简单快捷，成本低。并且还可以方便地调节各种参数，提高全息图的品质。

A method has been developed in this paper to gain effective speckle reduction in medical ultrasound images. To exploit full knowledge of the speckle distribution, here maximum likelihood was used to estimate speckle parameters corresponding to its statistical mode. Then the results were incorporated into the nonlinear anisotropic diffusion to achieve adaptive speckle reduction. Verified with simulated and ultrasound images, we show that this algorithm is capable of enhancing features of clinical interest and reduces speckle noise more efficiently than just applying classical filters. To avoid edge contribution, changes of contrast-to-noise ratio of different regions are also compared to investigate the performance of this approach.