How to capture snap with built-in camera using winforms

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!");
}
}
}
}

2 Replies

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Rajanikant Hawaldar5y ago
Accepted 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 Kumar5y ago
Thanks for immediate response let me check @rajanikant