How to capture snap with built-in camera using winforms

Question

Rajanikant Hawaldar · Answer

Hello Sanjay, Create project then add one picturebox and two buttons set button1 text as 'Start' and button2 text as Takesnap then install OpenCVSharp3 from nuget using Nuget Package Manager->Package Manager Console then copy below code. Make sure these OpenCvSharp, OpenCvSharp.Blob, OpenCvSharp.Extensions, OpenCvSharp.UserInterface are present under reference(added automatically after installation successfull from Package Manager Console. // Important: include the opencvsharp library in your code using OpenCvSharp; using OpenCvSharp.Extensions; using System; using System.Drawing; using System.Drawing.Imaging; using System.Threading; using System.Windows.Forms; namespace TakePhoto { public partial class Form1 : Form { // Create class-level accesible variables VideoCapture capture; Mat frame; Bitmap image; private Thread camera; bool isCameraRunning = false ; // Declare required methods private void CaptureCamera() { camera = new Thread( new ThreadStart(CaptureCameraCallback)); camera.Start(); } private void CaptureCameraCallback() { frame = new Mat(); capture = new VideoCapture(0); capture.Open(0); if (capture.IsOpened()) { while (isCameraRunning) { capture.Read(frame); image = BitmapConverter.ToBitmap(frame); if (pictureBox1.Image != null ) { pictureBox1.Image.Dispose(); } pictureBox1.Image = image; } } } public Form1() { InitializeComponent(); } // When the user clicks on the start/stop button, start or release the camera and setup flags private void button1_Click( object sender, EventArgs e) { if (button1.Text.Equals( "Start" )) { CaptureCamera(); button1.Text = "Stop" ; isCameraRunning = true ; } else { capture.Release(); button1.Text = "Start" ; isCameraRunning = false ; } } // When the user clicks on take snapshot, the image that is displayed in the pictureBox will be saved in your computer private void button2_Click( object sender, EventArgs e) { if (isCameraRunning) { // Take snapshot of the current image generate by OpenCV in the Picture Box Bitmap snapshot = new Bitmap(pictureBox1.Image); // Save in some directory // in this example, we'll generate a random filename e.g 47059681-95ed-4e95-9b50-320092a3d652.png snapshot.Save( string .Format(@ "D:\Mobile\dumy\{0}.png" , Guid.NewGuid()), ImageFormat.Png); } else { Console.WriteLine( "Cannot take picture if the camera isn't capturing image!" ); } } } }

Sanjay Kumar · Answer

Thanks for immediate response let me check @rajanikant