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How to recognize detection fact

Hello everyone. I'm new with opencv. I read tutorials and forums, related to opencv, but still have some problem...

My task is to find object on the photo using Keypoint descriptors scheme (Feature Detection/ Descriptor Extraction / Matcher). How can I determine that object is found on the image?

For now, I found method of calculating SVD ratio of singular values of homography. But when the image is rotated close to 180 degrees clockwise it's singular ratio becomes very large. Is there any way to fix this?

Maybe this task has other standard solution?

Thanks in advance!