EmguCV capture error: Cannot implicitly convert type 'Emgu.CV.Mat' to 'Emgu.CV.Image<Emgu.CV.Structure.Bgr,byte>

Question

I am using EmguCV with C#, I am facing a problem when I want to grab frames from my web cam, red underline appears on statement:

imgOrg = capturecam.QueryFrame();

error: Cannot implicitly convert type 'Emgu.CV.Mat' to 'Emgu.CV.Image

how can I solve this problem?

my code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

using Emgu.CV;
using Emgu.CV.CvEnum;
using Emgu.CV.Structure;
using Emgu.CV.UI;

namespace test2
{
    public partial class Form1 : Form
    {
        Image<Bgr, Byte> imgOrg; //image type RGB (or Bgr as we say in Open CV)
        private Capture capturecam;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            try
            {
                capturecam = new Capture();
            }
            catch (NullReferenceException exception)
            {
                MessageBox.Show(exception.Message);
                return;
            }
            Application.Idle += new EventHandler(ProcessFunction);

        }
        private void ProcessFunction(object sender, EventArgs arg)
        {
            imgOrg = capturecam.QueryFrame(); // error line
            imageBox1.Image = imgOrg;
        }
    }
}

Answer 1

该语句有效：

Image<Bgr, Byte> img = mat.ToImage<Bgr, Byte>();

Answer 2

imgOrg = new Image(capturecam.QueryFrame().Bitmap);

This Code Worked For me. I hope working for you too.

Answer 3

Try this:

imgOrg = capturecam.QueryFrame().ToImage<Bgr, Byte>();

Look here: how to convert mat to image in (Emgu CV version 3) in c#?

Or change your Image variable to Mat:

Mat imgOrg = new Mat(); // instead of: Image<Bgr, Byte> imgOrg;
imgOrg = capture.QueryFrame();
imageBox1.Image = imgOrg;

Answer 4

图片FRAME2 = frame.ToImage（）;

Answer 5

This is pretty straight forward. This works in Emgu CV 3.3++.

vidCap = new VideoCapture([filename or webcam device]);  
Mat mat = new Mat();  
vidCap.Read(mat);  //This calls Grab() as grabbing a frame and then Retrieve();  
imageBox1.Image = mat.Bitmap;  

Answer 6

Reference the example, the QueryFrame() not be used anymore at EmguCV 3.0. it be replaced by Retrieve() function.

Sample as shown below:

        Mat frame = new Mat();
        cap.Retrieve(frame, 0);
        Mat grayFrame = new Mat();
        CvInvoke.CvtColor(frame, grayFrame, ColorConversion.Bgr2Gray);

        imageBox1.Image = frame;
        imageBox2.Image = grayFrame;