Is SIFT a function in MATLAB ?

What features of image will I get after applying SIFT on that image ?

What is training image?

Answer 1

[Image Analyst]

No, it was patented by the professor who invented it. Fortunately there is another algorithm that is faster and performs about as well called SURF. It is in the Computer Vision System Toolbox: http://www.mathworks.com/help/vision/functionlist.html

[Mark Petty]

One could argue that although SURF maybe faster than SIFT, it is not as accurate.