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Hi I am new to opencv, right now. i want to do the images comparison. For example, i have 4 images as my database. Firstly, i get all the descriptors and cluster them into several groups. After that, i have a query image which is one image, i also get the descriptors. Right now, i want to match the query image descriptors with the existing cluster centers and group them. But i can not find any functions for doing that. Thanks for helping