diff --git a/AIParkingApplication/AIParkingApplicationForm.cs b/AIParkingApplication/AIParkingApplicationForm.cs
index 35831bb..f0f794c 100644
--- a/AIParkingApplication/AIParkingApplicationForm.cs
+++ b/AIParkingApplication/AIParkingApplicationForm.cs
@@ -7,7 +7,7 @@ namespace AIParkingApplication
         public AIParkingApplicationForm()
         {
             InitializeComponent();
-            LaneIn laneIn = new LaneIn();
+            LaneIn laneIn = new LaneIn(@"C:\HS_test.mp4", @"rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mov", true, true); //@"C:\CongRa_1.mp4";
             //LaneIn laneOut = new LaneIn();
             Controls.Add(laneIn);
             //laneOut.Location = new System.Drawing.Point(550, 0);
diff --git a/AIParkingApplication/LaneIn.cs b/AIParkingApplication/LaneIn.cs
index a796020..21ccff2 100644
--- a/AIParkingApplication/LaneIn.cs
+++ b/AIParkingApplication/LaneIn.cs
@@ -1,6 +1,7 @@
 using OpenCvSharp;
 using OpenCvSharp.Extensions;
 using System;
+using System.Threading;
 using System.Threading.Tasks;
 using System.Windows.Forms;
 
@@ -11,17 +12,16 @@ namespace AIParkingApplication
         private Camera overviewCamera;
         private Camera plateCamera;
         private PlateProcessor plateProcessor;
+        private bool isRetryMode;
+        private bool isRetryModeUntilOk;
 
-        public LaneIn()
+        public LaneIn(string plateStream, string overviewStream, bool isRetryMode = false, bool isRetryModeUntilOk = false)
         {
             InitializeComponent();
-            string overviewCameraVideo = @"rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mov";
-            //string overviewCameraVideo = @"C:\HS_test.mp4";
-            string plateCameraVideo = @"C:\HS_test.mp4";
-            //string plateCameraVideo = @"C:\CongRa_1.mp4";
-
-            overviewCamera = new Camera(overviewCameraVideo);
-            plateCamera = new Camera(plateCameraVideo);
+            this.isRetryMode = isRetryMode;
+            this.isRetryModeUntilOk = isRetryModeUntilOk;
+            overviewCamera = new Camera(overviewStream);
+            plateCamera = new Camera(plateStream);
 
             plateCamera.OnVideoFrameReceived += PlateCameraOnVideoFrameReceived;
             plateCamera.OnOneVideoFrameRequested += PlateCamera_OnOneVideoFrameRequested;
@@ -57,7 +57,21 @@ namespace AIParkingApplication
             {
                 try
                 {
-                    var finalPlateResult = await plateProcessor.ProcessPlate(videoFrame);
+                    FinalPlateResult finalPlateResult = await plateProcessor.ProcessPlate(videoFrame);
+
+                    if (isRetryMode && !plateProcessor.IsPlateStringValid(finalPlateResult.PlateString))
+                    {
+                        if (isRetryModeUntilOk)
+                        {
+                            CaptureAllCamera();
+                        }
+                        else
+                        {
+                            Console.WriteLine("PlateCamera_OnOneVideoFrameRequested Retry Mode");
+                            Thread.Sleep(1000);
+                            finalPlateResult = await plateProcessor.ProcessPlate(videoFrame);
+                        }
+                    }
 
                     lblPlateString.Invoke(new Action(() =>
                     {
diff --git a/AIParkingApplication/PlateProcessor.cs b/AIParkingApplication/PlateProcessor.cs
index f47ae02..750a78f 100644
--- a/AIParkingApplication/PlateProcessor.cs
+++ b/AIParkingApplication/PlateProcessor.cs
@@ -71,7 +71,7 @@ namespace AIParkingApplication
                 if (isSupportLongPlate)
                 {
                     plateResult = await DetectPlateAndDoOcrEngineAsync(PlateType.Long, frame);
-                    if (string.IsNullOrEmpty(plateResult.PlateString))
+                    if (!IsPlateStringValid(plateResult.PlateString))
                     {
                         plateResult = await DetectPlateAndDoOcrEngineAsync(PlateType.Square, frame);
                     }
@@ -97,17 +97,16 @@ namespace AIParkingApplication
             return plateString;
         }
 
-        //TODO: Complete this
-        private bool IsPlateStringValid(string plateString)
+        public bool IsPlateStringValid(string plateString, int minPlateStringLength = 4)
         {
-            bool isValid = true;
+            bool isValid = !string.IsNullOrEmpty(plateString) && plateString.Length > minPlateStringLength;
             return isValid;
         }
+    }
 
-        public class FinalPlateResult
-        {
-            public string PlateString { get; set; }
-            public Bitmap PlateImage { get; set; }
-        }
+    public class FinalPlateResult
+    {
+        public string PlateString { get; set; }
+        public Bitmap PlateImage { get; set; }
     }
 }