Image Targets represent images that Vuforia Engine can detect and track. The image is tracked by comparing extracted natural features from the camera image against a known target resource database. Once the Image Target is detected, Vuforia Engine will track the image and augment your content seamlessly using the best image-tracking technology in the market.
Using Image Targets
Common uses of Image Targets include recognizing and augmenting printed media and product packaging for marketing campaigns, gaming, and product visualizations.
The Vuforia Core Samples demonstrate Vuforia’s core features, including Image Targets, and can be a great starting point for implementing and configuring Image Targets in an application.
TIP: Customize these samples with your own targets and content!
Prerequisites
Supported Formats
Image Targets can be created using JPG or PNG images in RGB or grayscale with the Target Manager. The size of the input images must be 2.25 MB or less and have a minimum width of 320 pixels. Features extracted from these images are stored in a cloud or device database, of which the latter can be downloaded and packaged together with the application. The database can then be used by Vuforia Engine for runtime comparisons. Another option is to create Image Targets within the Unity Editor by directly using image assets or at runtime using the corresponding API.
NOTE: Image Targets are affected by glossiness and reflections from lighting sources. To maintain the best experience, the Image Target should be viewed under moderately bright and evenly lit diffused lighting. Please review the Best Practices for Designing and Developing Image-Based Targets and Physical Properties of Image Targets pages for further recommendations.
Creating and Managing Image Targets
Preparing and Designing Images
Image Targets can use any planar image that provides sufficient detail to be detected by the Vuforia Engine. Creating Image Targets consists of two steps. The first step is to design or select your target images and ensure they adhere to the directions in the following guides for sizing, defining, and optimizing the images.
See the guide Image Targets Optimization Techniques for recommendations on choosing or designing images for better AR quality experiences.
Create Image Targets
The second step is to create the actual Image Targets. Several options exist:
- Upload the images to the Target Manager for evaluation and processing. The Target Manager processes the images to generate both data and visual representations of the target’s features. It also lets you review the target's expected detection and tracking performance rating. The Image Targets can thereafter be downloaded as a package suitable for integration in both native and Unity. See the Target Manager for a detailed guide.
- As an alternative, Image Targets can also be created at runtime in both native IDEs and in the Unity Editor, which does not require you to upload the images. Specific guides for each can be found here:
- For use cases with thousands of images or a constantly updated set of images, such as product labels, newspapers, or magazines, Vuforia Engine also offers powerful cloud recognition technology. See the Cloud Reco feature description for detailed guides.
To further aid in selecting which solution best fits your use case, please see Comparison of Device and Cloud Databases
Advanced Topics
Using Device Tracking with Image Targets
The Device Pose Observer improves tracking robustness by using features of the environment surrounding the target. It enables you to use smaller targets and track targets farther away from the camera. Additionally, it enables Extended Tracking, where your target can be tracked even when no longer in the camera view.
See: Device Tracking
Using Multiple Image Targets Simultaneously
For your specific scenarios and better use cases, Vuforia offers simultaneous tracking of targets and target types. You can also manage the number of tracked targets to limit the performance strain on the devices. Let multiple Image Target cards activate based on proximity or deliver an event when all targets have been found and collected to provide your users with an immersive and interactive experience.
Visit Detect and Track Multiple Targets Simultaneously for more information.
Image Target API Overview
To track the Image Target it is associated with an Image Target Observer. The corresponding Observations return the tracking data of the Image Target.
Refer to the Image Target API Overview for more information.
Next Steps
Learn More about Image Targets and Best Practices for Preparing Images
Best Practices for Designing and Developing Image-Based Targets
Physical Properties of Image-Based Targets
Creating Image Targets
How to Access and Modify Targets at Run Time
Comparison of Device and Cloud Databases