对灰度图像进行小波变换，再对其低频子图像进行相似度的计算

自动识别图像中的圆形，并计算半径，及其相似度，希望有所帮助-Automatic identification of image circle, and calculate the radius, and its similarity, Hope that helps

SSIM的全称为structural similarity index，即为结构相似性，是一种衡量两幅图像相似度的指标。结构相似性计算方法，可以用于图像质量评估，(structural similarity is an index to measure the similarity of two images. The method of structural similarity calculation can be used for image quality assessment,)

采用Gist算法提取图像特征，采用欧式距离进行相似度计算，返回相似性图像。完整的GUI界面，完整的图像库 注意；根据需要调整图像根目录。(Gist algorithm is used to extract image features, and Euclidean distance is used for similarity computation, and the similarity image is returned. Complete GUI interface, complete