在使用OpenCV的三维立体重建的库时，一个重要的步骤就是生成左右视图的差异图Disparity，而控制生成disparity的参数的类是cv::StereoBM，我们有时候需要拷贝一份cv::StereoBM，然后改变其中的参数值，但是如果用默认的等号‘=’来进行拷贝，其实是浅拷贝，如果改变拷贝项的参数值，原来的参数值也会跟着改变，所以我们需要自己写一个深拷贝的函数，如下所示：
/** * Deep copy cv::StereoBM bm1 to bm2 */ void copy_bm(const cv::StereoBM &bm1, cv::StereoBM &bm2) { if (!bm1.state) { return; } bm2.init(CV_STEREO_BM_NORMALIZED_RESPONSE, 0, 21); bm2.state->preFilterSize = bm1.state->preFilterSize; bm2.state->preFilterCap = bm1.state->preFilterCap; bm2.state->SADWindowSize = bm1.state->SADWindowSize; bm2.state->minDisparity = bm1.state->minDisparity; bm2.state->numberOfDisparities = bm1.state->numberOfDisparities; bm2.state->textureThreshold = bm1.state->textureThreshold; bm2.state->uniquenessRatio = bm1.state->uniquenessRatio; bm2.state->speckleWindowSize = bm1.state->speckleWindowSize; bm2.state->speckleRange = bm1.state->speckleRange; }
原文：http://www.cnblogs.com/grandyang/p/5610251.html