From 5d09d95f909e7d8de0ef25a6826759c2bc4ee7b6 Mon Sep 17 00:00:00 2001
From: DucDangAnh <ducdanganhit@gmail.com>
Date: Thu, 18 Jun 2020 02:29:03 +0700
Subject: [PATCH] Use Task To Make UI More Responsive In Event handler:
 PlateCamera_OnOneVideoFrameRequested.

---
 AIParkingApplication/LaneIn.cs | 54 ++++++++++++++++++----------------
 1 file changed, 28 insertions(+), 26 deletions(-)

diff --git a/AIParkingApplication/LaneIn.cs b/AIParkingApplication/LaneIn.cs
index f8ec612..6f58f56 100644
--- a/AIParkingApplication/LaneIn.cs
+++ b/AIParkingApplication/LaneIn.cs
@@ -3,6 +3,7 @@ using OpenCvSharp.Extensions;
 using System;
 using System.Drawing;
 using System.IO;
+using System.Threading.Tasks;
 using System.Windows.Forms;
 
 namespace AIParkingApplication
@@ -44,37 +45,38 @@ namespace AIParkingApplication
 
         private void PlateCamera_OnOneVideoFrameRequested(Mat videoFrame)
         {
-            Cv2.Resize(videoFrame, videoFrame, new OpenCvSharp.Size(1280, 720));
-            Mat result = squarePlateDetector.DetectPlate(videoFrame);
-
-            Cv2.Resize(result, result, new OpenCvSharp.Size(272, 272));
-            var response = Util.SendEngineRequestAsync(result, PlateType.Square);
-
-            Bitmap resultPlateImage;
-            OcrResult ocrResult = response.Result;
-            if (!string.IsNullOrEmpty(ocrResult.Ocr) && !string.IsNullOrEmpty(ocrResult.Plate))
+            Task.Factory.StartNew(new Action(async () =>
             {
-                var imageData = Convert.FromBase64String(ocrResult.Plate);
-                using (var ms = new MemoryStream(imageData))
+                Cv2.Resize(videoFrame, videoFrame, new OpenCvSharp.Size(1280, 720));
+                Mat result = squarePlateDetector.DetectPlate(videoFrame);
+
+                Cv2.Resize(result, result, new OpenCvSharp.Size(272, 272));
+                OcrResult ocrResult = await Util.SendEngineRequestAsync(result, PlateType.Square);
+
+                Bitmap resultPlateImage;
+                if (!string.IsNullOrEmpty(ocrResult.Ocr) && !string.IsNullOrEmpty(ocrResult.Plate))
                 {
-                    resultPlateImage = new Bitmap(ms);
+                    var imageData = Convert.FromBase64String(ocrResult.Plate);
+                    using (var ms = new MemoryStream(imageData))
+                    {
+                        resultPlateImage = new Bitmap(ms);
+                    }
+                }
+                else
+                {
+                    resultPlateImage = result.ToBitmap();
                 }
-            }
-            else
-            {
-                resultPlateImage = result.ToBitmap();
-            }
 
+                lblPlateString.Invoke(new Action(() =>
+                {
+                    lblPlateString.Text = ocrResult.Ocr;
+                }));
 
-            lblPlateString.Invoke(new Action(() =>
-            {
-                lblPlateString.Text = ocrResult.Ocr;
-            }));
-
-            pictureBoxPlateImage.Invoke(new Action(() =>
-            {
-                pictureBoxPlateImage.Image?.Dispose();
-                pictureBoxPlateImage.Image = resultPlateImage;
+                pictureBoxPlateImage.Invoke(new Action(() =>
+                {
+                    pictureBoxPlateImage.Image?.Dispose();
+                    pictureBoxPlateImage.Image = resultPlateImage;
+                }));
             }));
         }