Correct aspect ratio handling

[Alex18947]

Thanks for the OpenCV contribution, trying to undestand the code, it seems to me (see here), that sample images are resized without keeping their aspect ratio (same goes for the C++ sample). How does that affect the features extraction and similarity calculations? Does an aspect ratio modification not affect some of the features? With other words, wouldn"t a different approach like resizing with cropping or even with letter boxing be a better approach?

Thanks for clarification.