1，首先要安装OpenCvSharp,使用cv2的函数获取设备，并将图像转换到Bitmap
using OpenCvSharp;
using OpenCvSharp.Extensions;
void run_cap()
{
Mat src = new Mat();
FrameSource frame = Cv2.CreateFrameSource_Camera(0);
while (f1)
{
frame.NextFrame(src);
Bitmap bitmap = BitmapConverter.ToBitmap(src);
Invalidate();
pictureBox1.Invalidate();
imgshow = bitmap;
}
}2,在调用时开启线程，可以在主函数内调用，也可在按钮内调用
private void button1_Click(object sender, EventArgs e)
{
// Image imgshow0 = Image.FromFile("src.jpg");
// pictureBox1.Image = imgshow0;
Thread threadA = new Thread(run_cap);
threadA.Start();
}3，在form框架调用重绘函数将每一帧重绘到pictureBox1
this.pictureBox1.Paint += PictureBox1_Paint;
4，函数如下：
private void PictureBox1_Paint(object sender, PaintEventArgs e)
{
if (f)
{
Invalidate();pictureBox1.Invalidate();
e.Graphics.DrawImage(imgshow,0,0);
}
}5，运行如下：
