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vector<matchesinfo> pairwise_matches;
BestOf2NearestMatcher matcher(false, 0.3f);

Mat matchMask(features.size(),features.size(),CV_8U,Scalar(0));
for (int i = 0; i < num_images -1; ++i)
matchMask.at<char>(i,i+1) =1;

matcher(features, pairwise_matches, matchMask);
matcher.collectGarbage();

Replace this code in your stitching_detailed.cpp and you'll be able to perform linear pairwise matching, as you already know the sequence of images.