How to Set Up Image Recognition in AR Foundation Unity Project

Project Preparation

• **Ensure AI Deployment Readiness: **
  • Go to build settings and check iOS
  • Import all XR packages from the package manager

Package Version

• Minimum Required Version:
  • Version 2.2.0 for using image recognition
  • Preview versions can be used if necessary

Adding AR Tracked Image Manager

1. **Navigate to Session Origin: **

• Add component "AR Tracked Image Manager"

2. AR Tracked Image Manager Options:

• Reference Library: Defines which images to track
  • Max number of moving images: Set how many images to detect
  • AR Tracked Image Prefab: Prefab instantiated when image recognized

Creating XR Reference Image Library

1. **Create Scriptable Object: **

• Right-click: Create > XR > Reference Image Library
  • Add images from your desktop to this library

2. **Specify Image Properties: **

• Set size (e.g., 30 cm) and Keep Texture Runtime option

Scripting the Image Recognition

1. Create C# Script:

• Name it ImageRecognitionExample

2. Script Edits:

• Add references for AR Tracked Image Manager and necessary Unity libraries
  • Implement the OnEnable and OnDisable methods for event subscription
  • Write OnImageChanged method to handle image recognition events
  • Iterate through the list of arcs.added to handle recognized images

Instantiating Recognized Images

1. **Create Prefab: **

• Create a 3D cube in the hierarchy
  • Adjust position and size, then convert it into a prefab

2. **Assign Prefab: **

• Assign this prefab in the AR Tracked Image Prefab

Building the Project

1. **Build Settings: **

• Switch to iOS or Android depending on requirements
  • Build and save the project

Final Steps

• **Test Image Recognition: **
  • Open the recognized image, and observe the instantiation and movement of the prefab (e.g., a cube)
• **Customization: **
  • Use animations, add sounds, or implement additional functionalities as needed

Conclusion

• Wrap Up:
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