该程序SSIM（结构相似度）是基于matlab平台，用于图像的客观质量评价，是FR中精典算法,The program SSIM (structural similarity) is based on matlab platform for an objective image quality evaluation, is in the classical algorithm FR

首先利用形态学开运算将图像中小于结构元素的亮点去掉，利用源图像与处理后的图像作差，对差图像进行阈值分割，得到二值图像，将二值图像中的一些干扰区域去掉，提取二值图像中的圆形区域，并在源图像上对小目标进行标记，实现对圆形亮目标的检测-Remove the area in the image smaller than structural element by morphologic open operation，receive image A，original image subtract imag

ssim是结构化相似度，描述两个图像之间在结构上的相似程度，一般用与检测图像的不可见性。-Ssim is structural similarity, described in structural similarity between two images, and is commonly used in testing the invisibility of the image。

beso双向渐进结构拓扑优化原始代码，采用软杀伤法(the source code of Bidirectional evolutionary structural topology optimization with the soft kill law BESO)