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README.md

Using OpenCV Contrib

The OpenCV Contrib library contains experimental or non-free (aka patented) algorithms.

GoCV support for OpenCV Contrib can be found here in the "gocv.io/x/gocv/contrib" package.

For more information about OpenCV Contrib, please go to:

https://github.com/opencv/opencv_contrib

How to use

If you have followed the installation instructions from the main README, then the OpenCV contrib modules have already been compiled and installed.

First, you must include the contrib subpackage:

import (
    "gocv.io/x/gocv"
    "gocv.io/x/gocv/contrib"
)

Then you will be able to use the functions within the contrib subpackage. For example, this uses the SIFT feature identitification algorithm that is within the xfeatures2d module of OpenCV:

si := contrib.NewSIFT()
kp := si.Detect(img)

Note that some of the features in this package require building OpenCV with the OPENCV_ENABLE_NONFREE=ON option. You can run make build_nonfree to build with this option.