AugmentedImageExampleController.cs

foreach (var image in m_TempAugmentedImages)
            {
                AugmentedImageVisualizer visualizer = null;
                m_Visualizers.TryGetValue(image.DatabaseIndex, out visualizer);
                if (image.TrackingState == TrackingState.Tracking && visualizer == null)
                {
                    // Create an anchor to ensure that ARCore keeps tracking this augmented image.
                    Anchor anchor = image.CreateAnchor(image.CenterPose);
                    visualizer = (AugmentedImageVisualizer)Instantiate(AugmentedImageVisualizerPrefab, anchor.transform);
                    visualizer.Image = image;
                    m_Visualizers.Add(image.DatabaseIndex, visualizer);
                }
                else if (image.TrackingState == TrackingState.Stopped && visualizer != null)
                {
                    m_Visualizers.Remove(image.DatabaseIndex);
                    GameObject.Destroy(visualizer.gameObject);
                }
            }