Image processing: Image recognition and classification on fish I need to identify the type of fish caught from fish images. How can I locate anchor points/landmark points to extract features from the image?

Namely, I  want to locate eye position, dorsal and pelvic fin. Need to get Fish mouth length, Dorsal and Caudal fin length.

Right now I am trying with SIFT method to get key points.

Can someone suggest me how can I get the specific key points?

Example images can be found in Fish Recognition Based on Robust Features Extraction from Size and Shape Measurements Using Neural Network, 2010, Journal of Computer Science (online version).
How can I get the specific key points?


I'm not sure but I think you are talking about Feature matching using SIFT.


Extract keypoints using SIFT from reference images of what you are trying to match.
Extract keypoints using SIFT from the test images.
Try to match the keypoints from reference images to test images using algorithms like RANSAC to get the position of the features(in your case eye,dorsal and pelvic fin).


You can find more information here.