Feature Detection using OpenCV 1.01



Publisher Description



This app demonstrates several of the OpenCV Feature Detection algorithms.


When you first run it, it will prompt you to download opencv from Google Play. This is painless and necessary.

There is a video that explains how to use it here: https://youtu.be/cXuRiw--KH4

Or, read on:

To start, point the camera at an object you'd like to track. Then hit 'Train'. The object should be on a solid background so that no extraneous feature points are detected.

Then try moving the camera around and watch the app try to locate your object on the screen.

There are 3 modes which are accessible from the '...' menu in the upper right:
1. Match mode. This is the default. It shows the original object and draws lines to the feature points it is able to match.
2. Box mode. This uses findHomography() routine to draw a box around the object. Not perfect if the object is too small. Designed for planar objects.
3. Draw key points. Just shows you the detected key points.

You can choose one of several algorithms:
1. ORB Detector, ORB Descriptor Extractor.
2. ORB Detector, FREAK Descriptor Extractor.
3. BRISK Detector, BRIEF Descriptor Extractor.
4. STAR Detector, BRIEF Descriptor Extractor.

There are several matching modes you can experiment with.
1. KNN: K-nearest neighbor matcher. Finds the 15 nearest matches for each feature.
2. Ratio Check: Finds the 2 nearest neighbors and rejects any feature where the 2 nearest matches are too similar.
3. Cross-check: Filters matches to those which agree backwards and forwards.

Ratio Check, Cross-Check filter matches, reduce the total count. You can also filter on 'distance' which is really a quality measure, using the slider.

There are 2 Seek Bars in the app:

The first one controls the max distance beyond which a match will be excluded.
The second one controls the Ransac threshold. It is only used for Homography. (Drawing the box).

Source Code is at: https://github.com/rwoodley/SteamSpace/tree/master/AndroidApps/FeatureDetectorApp



About Feature Detection using OpenCV

Feature Detection using OpenCV is a free app for Android published in the Teaching & Training Tools list of apps, part of Education.

The company that develops Feature Detection using OpenCV is Robert Woodley. The latest version released by its developer is 1.01.

To install Feature Detection using OpenCV on your Android device, just click the green Continue To App button above to start the installation process. The app is listed on our website since 2016-01-31 and was downloaded 7 times. We have already checked if the download link is safe, however for your own protection we recommend that you scan the downloaded app with your antivirus. Your antivirus may detect the Feature Detection using OpenCV as malware as malware if the download link to net.steamspace.cv.featuredetection is broken.

How to install Feature Detection using OpenCV on your Android device:

  • Click on the Continue To App button on our website. This will redirect you to Google Play.
  • Once the Feature Detection using OpenCV is shown in the Google Play listing of your Android device, you can start its download and installation. Tap on the Install button located below the search bar and to the right of the app icon.
  • A pop-up window with the permissions required by Feature Detection using OpenCV will be shown. Click on Accept to continue the process.
  • Feature Detection using OpenCV will be downloaded onto your device, displaying a progress. Once the download completes, the installation will start and you'll get a notification after the installation is finished.



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Users Rating:  
  0.0/5     0
Downloads: 7
Updated At: 2024-03-19
Publisher: Robert Woodley
Operating System: Android
License Type: Free