一.控件效果说明

二.代码声明（已经循环读取10000次）

全局

OpenCvSharp.Point point = new OpenCvSharp.Point(0, 0);
OpenCvSharp.Size size2;
Mat src = new Mat();

初始化

  size2 = new OpenCvSharp.Size(pictureBox1.Size.Width, pictureBox1.Size.Height);

按钮代码

  OpenFileDialog openFileDialog = new OpenFileDialog();
  openFileDialog.Filter = "图文件(*.*)|*.jpg;*.png;*.jpeg;*.bmp";
  openFileDialog.RestoreDirectory = true;
  openFileDialog.Multiselect = false;
  if (openFileDialog.ShowDialog() == DialogResult.OK)
  {

      src = Cv2.ImRead(openFileDialog.FileName);
      //适应图片

      Mat showmat = new Mat();
      Cv2.Resize(src, showmat, size2);
      pictureBox1.Image = OpenCvSharp.Extensions.BitmapConverter.ToBitmap(showmat);
      Cv2.WaitKey(100);
      src.Dispose();
      pictureBox1.Update();
      pictureBox1.Image.Dispose();
      showmat.Dispose();
  }

总体代码实例：

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

namespace C1_6
{
    public partial class Demo2_adaptwindow : Form
    {
        OpenCvSharp.Point point = new OpenCvSharp.Point(0, 0);
        OpenCvSharp.Size size2;
        Mat src = new Mat();
        public Demo2_adaptwindow()
        {
            InitializeComponent();
            size2 = new OpenCvSharp.Size(pictureBox1.Size.Width, pictureBox1.Size.Height);
        }
      
        private void button1_Click(object sender, EventArgs e)
        {
            OpenFileDialog openFileDialog = new OpenFileDialog();
            openFileDialog.Filter = "图文件(*.*)|*.jpg;*.png;*.jpeg;*.bmp";
            openFileDialog.RestoreDirectory = true;
            openFileDialog.Multiselect = false;
            if (openFileDialog.ShowDialog() == DialogResult.OK)
            {

                src = Cv2.ImRead(openFileDialog.FileName);
                //适应图片

                Mat showmat = new Mat();
                Cv2.Resize(src, showmat, size2);
                pictureBox1.Image = OpenCvSharp.Extensions.BitmapConverter.ToBitmap(showmat);
                Cv2.WaitKey(100);
                src.Dispose();
                pictureBox1.Update();
                pictureBox1.Image.Dispose();
                showmat.Dispose();
            }

        }
    }
}