Feature Matching (Homography) Brute Force - OpenCV with Python for Image and Video Analysis 14

Welcome to a feature matching tutorial with OpenCV and Python. Feature matching is going to be a slightly more impressive version of template matching, where a perfect, or very close to perfect, match is required.

We start with the image that we're hoping to find, and then we can search for this image within another image. The beauty here is that the image does not need to be the same lighting, angle, rotation...etc. The features just need to match up.

[billylee]

Very disappointed that there is no other similar video introducing opencv-python. This tutorial is just a copy of code from opencv documentation website. Nearly zero explanation of the functions of the code, instead of typing in the code, why not just copy & paste and make some explanation.

[anonymouscoward]

@5:06 "we've got the butthole here...apparently" - LOL

[divyanshchaudhary]

why don't you explain the code properly?

[cl]

omg exactly what I was looking for, thank you!!

[RexIbaraki]

is there anyway of detecting irregularly shaped object, like for example liquids, in opencv? or in image processing in general. It would be a great help if this is answered because it's for my project at school. thanks in advance.

[mochicat]

Thank You so much Sir, from phillippines

[dual_]

can you train feature extraction? in opencv just like haartraining. i want identify paper bills and i want it to be accurate so i want to train the program

[thehellraiserap]

Hi @sentdex really appreciate your videos, they are a great help. But i feel some of the videos in the OpenCV series, such as this one, do not have the usual amount of explanation you provide. Hope you would go into a little more detail in future videos. Thanks again!

[bricssi]

can we use this feature matching to match two images of same person?
or is there is better way to do this?

[ayushjaiswal]

@sentdex my cam doesnt goes off as its light keeps on even after command cap.release(). What to do?

[carolinaloch]

So, when i use your images everything goes really well. I use mine and this error appears:
matches = bf.match(des1, des2)
cv2.error: OpenCV(4.2.0) error: (-215:Assertion failed) _queryDescriptors.type() == trainDescType in function 'cv::BFMatcher::knnMatchImpl'
I don't know if there is an specific measure for the images, maybe the maximum is 200 by 200 pixels for the template? or does the template has to be of a similar size of the object in the image?

[isus]

This is good. Can this method be used to stitch Ariel images together to create a map

[marciocaster]

Can you do this comparing a database with images with VideoCapture?

[gutsultv]

Now robots can recognize buttholes.. Dear human, be careful

[MichelMrz]

Hi i really enjoy ur channel its great, i wonder why you choose ORB::operator() there many many feature detection methods in openCV docs, and I don't know which one i should choose

[musicjunction]

+sentdex You can change the minimum distance between corners parameter to say 1 in order to get that one left corner inside the letter 'e'.
corners = cv2.goodFeaturesToTrack(gray, 100, 0.01, 1)

[RnFChannelJr]

greatt tutorial sir, what type of webcam you use for make this video ?

[benghalemaziz]

How to use SURF/KMeans classifer for image matching ?

[ogporon]

Can I storage a array of images with name X and compare one image Whith name Y to all the array X, in least amount of time ?

[sathishrs]

How do i rotate after finding the features, i need to flip/rotate 90, 180, 270 degrees.. how can we do that?