AIParkingApplication/Camera.cs

@@ -7,8 +7,9 @@ namespace AIParkingApplication
     public class Camera
     {
         private string streamUrl;
+        private bool isCapturing;
+        private object lockSyncObject;
         private volatile bool isFrameRequested;
-        private Thread readStreamThread;
 
         public event CameraEvent OnVideoFrameReceived;
         public event CameraEvent OnOneVideoFrameRequested;
@@ -16,24 +17,16 @@ namespace AIParkingApplication
         public Camera(string streamUrl)
         {
             this.streamUrl = streamUrl;
+            isCapturing = true;
             isFrameRequested = false;
-            readStreamThread = new Thread(new ThreadStart(ReadVideoStream));
-            readStreamThread.IsBackground = true;
+            lockSyncObject = new object();
         }
 
-        ~Camera()
+        public void Startcapture()
         {
-            Stop();
-        }
-
-        public void Start()
-        {
-            if (!readStreamThread.IsAlive)
-            {
-                readStreamThread = new Thread(new ThreadStart(ReadVideoStream));
-                readStreamThread.IsBackground = true;
-                readStreamThread.Start();
-            }
+            Thread readVideoStreamThread = new Thread(new ThreadStart(ReadVideoStream));
+            readVideoStreamThread.IsBackground = true;
+            readVideoStreamThread.Start();
         }
 
         public void RequestCaptureOneFrame()
@@ -54,6 +47,10 @@ namespace AIParkingApplication
             {
                 Thread.Sleep(50);     //Stream Thread Sleep
                 //Thread.Sleep(40);     //Video Thread Sleep
+                if (!isCapturing)
+                {
+                    continue;
+                }
 
                 if (videoCapture.Read(videoFrame) && videoFrame.Width > 0 && videoFrame.Height > 0)
                 {
@@ -67,11 +64,11 @@ namespace AIParkingApplication
             }
         }
 
-        public void Stop()
+        public void PauseCapture()
         {
-            if (readStreamThread.IsAlive)
+            lock (lockSyncObject)
             {
-                readStreamThread.Abort();
+                isCapturing = false;
             }
         }
     }

AIParkingApplication/LaneIn.cs

@@ -33,6 +33,9 @@ namespace AIParkingApplication
             overviewCamera.OnVideoFrameReceived += OverviewCameraOnVideoFrameReceived;
             overviewCamera.OnOneVideoFrameRequested += OverviewCamera_OnOneVideoFrameRequested;
 
+            overviewCamera.Startcapture();
+            plateCamera.Startcapture();
+
             plateProcessor = new PlateProcessor(this.isSupportSquarePlate, this.isSupportLongPlate);
         }
 
@@ -58,8 +61,6 @@ namespace AIParkingApplication
             {
                 try
                 {
-                    //TODO: check size before resizing
-                    Cv2.Resize(videoFrame, videoFrame, new Size(1280, 720));
                     FinalPlateResult finalPlateResult = await plateProcessor.ProcessPlate(videoFrame);
 
                     if (isRetryMode && !plateProcessor.IsPlateStringValid(finalPlateResult.PlateString))
@@ -96,18 +97,6 @@ namespace AIParkingApplication
             }));
         }
 
-        public void Stop()
-        {
-            plateCamera.Stop();
-            overviewCamera.Stop();
-        }
-
-        public void Start()
-        {
-            plateCamera.Start();
-            overviewCamera.Start();
-        }
-
         private void OverviewCameraOnVideoFrameReceived(Mat videoFrame)
         {
             try

AIParkingApplication/PlateDetector.cs

@@ -28,19 +28,10 @@ namespace AIParkingApplication
             Rect[] plateRectsDetected = plateCascadeClassifier.DetectMultiScale(frame, scaleFactor, minNeighbors, HaarDetectionType.ScaleImage, minSizePlate, maxSizePlate);
             Console.WriteLine("Plate Detected Length: " + plateRectsDetected.Length);
             if (plateRectsDetected.Length > 0)
-            {
-                try
             {
                 Mat plateImage = GetBiggestPlate(plateRectsDetected, frame);
-                    Cv2.Resize(plateImage, plateImage, new Size(272, 272));
                 return plateImage;
             }
-                catch (Exception ex)
-                {
-                    Console.WriteLine($"DetectPlate\t{ex.Message}");
-                    return frame;
-                }
-            }
             else
             {
                 return frame;

AIParkingApplication/PlateProcessor.cs

@@ -34,6 +34,9 @@ namespace AIParkingApplication
         {
             Mat plateDetected = plateType == PlateType.Square ? squarePlateDetector.DetectPlate(frame) : longPlateDetector.DetectPlate(frame);
 
+            //TODO: check size before resizing
+            Cv2.Resize(plateDetected, plateDetected, new OpenCvSharp.Size(272, 272));
+
             //TODO: Check if plateDetected empty
             OcrResult plateOcrResultFromEngine = await Util.SendEngineRequestAsync(plateDetected, plateType);
             Bitmap finalPlateImage;
@@ -61,7 +64,10 @@ namespace AIParkingApplication
         {
             try
             {
+                //TODO: check size before resizing
+                Cv2.Resize(frame, frame, new OpenCvSharp.Size(1280, 720));
                 FinalPlateResult plateResult;
+
                 if (isSupportLongPlate)
                 {
                     plateResult = await DetectPlateAndDoOcrEngineAsync(PlateType.Long, frame);
@@ -81,11 +87,7 @@ namespace AIParkingApplication
             catch (Exception ex)
             {
                 Console.WriteLine($"{Util.GetCurrentMethodName()}\texMessage: {ex.Message}");
-                return new FinalPlateResult
-                {
-                    PlateString = string.Empty,
-                    PlateImage = frame.ToBitmap()
-                };
+                return new FinalPlateResult();
             }
         }