arnold780114's profile - activity

Thanks for your all answers!

When I use this code "float x = keypoints_object[0].pt.x;" , it show the message as the following.

how do I deal with this problem?

The following is my code.

std::vector<KeyPoint> keypoints_object, keypoints_scene;
detector.detect( img_object, keypoints_object );
detector.detect( img_scene, keypoints_scene );

I'm trying to get the coordinate in the keypoints_object & keypoints_scene to store in another variable. Does someone know how to do it? (PS:My opencv version is 2.4.2)

thanks for your help!

oh! What I'm talking about is how to get every vector because I want to use that to do image matching by myself.

I use SiftDescriptorExtractor to compute the descriptors of keypoints. I'm trying to get the descriptor value. Does someone know how to do it?

(PS:My opencv version is 2.4.2)

This is the part of the code

//-- Step 2: Calculate descriptors (feature vectors)
SiftDescriptorExtractor extractor;
Mat descriptors_object, descriptors_scene;
extractor.compute( img_object, keypoints_object, descriptors_object );
extractor.compute( img_scene, keypoints_scene, descriptors_scene );