It compares the known size of the marker to its size in a given image frame. OpenCV does not use the ZED’s depth features to determine the 3D position of a marker. If you use a different marker, you will need to change this value. It’s 0 by default - this tells it to detect ArUco marker of index 0, which corresponds to the one you are displaying (aruco_4x4_0). Note the Marker ID value in MarkerObject_MoveToMarker. Create a cube object and add a MarkerObject_MoveToMarker component to it.Create another empty GameObject, name it “ArUco Detection Manager” and add a ZEDArUcoDetectionManager component to it.Create an empty GameObject, rename it “ZED to OpenCV Retriever” and add a ZEDToOpenCVRetriever component to it.In the Projects tab, go to ZED -> Prefabs and drag a ZED_Rig_Mono into your scene (use ZED_Rig_Stereo instead if you want to use pass-through AR).Create a new scene and delete the main camera.These scripts are excluded from compilation when the OpenCV for Unity package isn’t imported. You won’t actually touch these assets during the tutorial - they are required for the marker detection scripts in the ZED Unity plugin to work. You can use the free trial version for the tutorial, but you won’t be able to build a standalone app.ĭownload and import the OpenCV for Unity package. The fastest way to use OpenCV within Unity is to use Enox Software’s OpenCV for Unity package on the Asset Store. Display the marker on your cell phone and turn the brightness all the way up.Open the file and leave it open on a second monitor.

You need to display this image somewhere in the real world for your app to see. We’ll use aruco_4x4_0.png for this tutorial. You’ll find five example markers that OpenCV looks for in the ZED -> Examples -> OpenCV ArUco Detection -> ArUco Marker Images folder. All you need to do is get some real-world markers to look at. OpenCV natively includes a collection of these markers, and scripts from the ZED Unity plugin already tell OpenCV which markers to look for. Our app will be looking for “ArUco” style markers.

In this tutorial, you’ll learn how to detect visual markers and place virtual objects on top of them using OpenCV, Unity and the ZED.

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