614e250fd3
Rename features2d #26405 This PR renames the module _features2d_ to _features_ as one of the Big OpenCV Cleanup #25007. Related PR: opencv/opencv_contrib: [#3820](https://github.com/opencv/opencv_contrib/pull/3820) opencv/ci-gha-workflow: [#192](https://github.com/opencv/ci-gha-workflow/pull/192)
2.1 KiB
Features + Homography to find a known object
@tableofcontents
@prev_tutorial{tutorial_feature_flann_matcher} @next_tutorial{tutorial_detection_of_planar_objects}
| Original author | Ana Huamán |
| Compatibility | OpenCV >= 3.0 |
Goal
In this tutorial you will learn how to:
- Use the function @ref cv::findHomography to find the transform between matched keypoints.
- Use the function @ref cv::perspectiveTransform to map the points.
\warning You need the OpenCV contrib modules to be able to use the SURF features (alternatives are ORB, KAZE, ... features).
Theory
Code
@add_toggle_cpp This tutorial code's is shown lines below. You can also download it from here @include samples/cpp/tutorial_code/features/feature_homography/SURF_FLANN_matching_homography_Demo.cpp @end_toggle
@add_toggle_java This tutorial code's is shown lines below. You can also download it from here @include samples/java/tutorial_code/features/feature_homography/SURFFLANNMatchingHomographyDemo.java @end_toggle
@add_toggle_python This tutorial code's is shown lines below. You can also download it from here @include samples/python/tutorial_code/features/feature_homography/SURF_FLANN_matching_homography_Demo.py @end_toggle
Explanation
Result
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And here is the result for the detected object (highlighted in green). Note that since the homography is estimated with a RANSAC approach, detected false matches will not impact the homography calculation.
