ImaageQ_Unity_App/Assets/Scripts/ObjectDetection/ObjectDetectionSample.cs

using Niantic.Lightship.AR.ObjectDetection;
using UnityEngine;

public class ObjectDetectionSample : MonoBehaviour
{
    private ARObjectDetectionManager _objectDetectionManager;
    [SerializeField]
    private DrawRect _drawRect;

    private Camera _mainCamera;
    private Canvas _canvas;

    private Color[] _colors = new Color[]
    {
        Color.red, Color.blue, Color.green, Color.yellow, Color.magenta,
        Color.cyan, Color.white, Color.black
    };

    private Vector3 _lastCameraPosition;
    private float _movementThreshold = 0.005f; // Adjust for sensitivity
    private float _detectionSlowdownRate = 0.0f; // Detection frame rate for stationary camera
    private float _detectionNormalRate = 1.0f;   // Detection frame rate for moving camera
    private bool _isCameraMoving = false;
    private float confidencePercentage = 0.65f;

    private void Awake()
    {
        _mainCamera = Camera.main;
        if (_mainCamera == null)
        {
            Debug.LogError("Main Camera not found.");
        }

        _objectDetectionManager = FindObjectOfType<ARObjectDetectionManager>();
        if (_objectDetectionManager == null)
        {
            Debug.LogError("ARObjectDetectionManager not found.");
        }

        _canvas = FindObjectOfType<Canvas>();
        if (_canvas == null)
        {
            Debug.LogError("Canvas not found.");
        }
    }

    private void Start()
    {
        if (_objectDetectionManager != null)
        {
            _objectDetectionManager.enabled = true;
            _objectDetectionManager.ObjectDetectionsUpdated += ObjectDetectionsUpdated;
            Debug.Log("Object detection started.");
        }

        _lastCameraPosition = _mainCamera.transform.position;
    }

    private void Update()
    {
        DetectCameraMovement();
    }

    private void DetectCameraMovement()
    {
        if (_mainCamera == null) return;

        Vector3 currentCameraPosition = _mainCamera.transform.position;
        float movement = Vector3.Distance(currentCameraPosition, _lastCameraPosition);

        Debug.Log($"Camera Movement Detected: {movement}");

        if (movement > _movementThreshold)
        {
            if (!_isCameraMoving)
            {
                // Resume full frame rate for detection
                _isCameraMoving = true;
                SetDetectionFrameRate(_detectionNormalRate);
                Debug.Log("Camera is moving, increasing detection rate.");
            }
        }
        else
        {
            if (_isCameraMoving)
            {
                // Slow down detection to save performance
                _isCameraMoving = false;
                SetDetectionFrameRate(_detectionSlowdownRate);
                Debug.Log("Camera is stationary, slowing detection rate.");
            }
        }

        _lastCameraPosition = currentCameraPosition;
    }

    private void SetDetectionFrameRate(float frameRate)
    {
        if (_objectDetectionManager != null)
        {
            _objectDetectionManager.TargetFrameRate = (uint)frameRate;
        }
    }

    private void ObjectDetectionsUpdated(ARObjectDetectionsUpdatedEventArgs args)
    {
        if (_mainCamera == null || _objectDetectionManager == null) return;

        var result = args.Results;
        if (result == null || result.Count == 0)
        {
            Debug.Log("No detections found.");
            return;
        }

        Debug.Log($"Detections found: {result.Count}");

        _drawRect.ClearRects();

        for (int i = 0; i < result.Count; i++)
        {
            var detection = result[i];
            if (detection.GetConfidentCategorizations().Count == 0) continue;

            var categoryToDisplay = detection.GetConfidentCategorizations()[0];
            float confidence = categoryToDisplay.Confidence;

            if (confidence <= confidencePercentage) continue; // Adjust threshold if needed

            string categoryName = categoryToDisplay.CategoryName;

            int h = Mathf.FloorToInt(_canvas.GetComponent<RectTransform>().rect.height);
            int w = Mathf.FloorToInt(_canvas.GetComponent<RectTransform>().rect.width);
            var rect = detection.CalculateRect(w, h, Screen.orientation);

            Debug.Log($"Detected: {categoryName} with confidence {confidence * 100:F1}%");

            string label = $"{categoryName}";
            _drawRect.CreateRect(rect, _colors[i % _colors.Length], label);
        }
    }

    private void OnDestroy()
    {
        if (_objectDetectionManager != null)
        {
            _objectDetectionManager.ObjectDetectionsUpdated -= ObjectDetectionsUpdated;
        }
    }
}