C# + WinForm + EmguCV 学习二：创建和操作图片

程序如下；

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 System.Xml;
using System.Xml.Serialization;
using System.IO;


namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        /// <summary>
        /// 显示蓝色图
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e)
        {
            Image<Bgr, Byte> img1 = new Image<Bgr, byte>(320, 240, new Bgr(255, 0, 0));
            pictureBox1.Image = img1.ToBitmap();

            
        }

        /// <summary>
        /// 从对话框打开一副图片；
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button2_Click(object sender, EventArgs e)
        {
            string strFileName = string.Empty;
            OpenFileDialog ofd = new OpenFileDialog();
            if(ofd.ShowDialog()==DialogResult.OK)
            {
                Image<Bgr, Byte> img1 = new Image<Bgr, byte>(ofd.FileName);
                pictureBox1.Image = img1.ToBitmap();
            }
        }
        /// <summary>
        /// 对像素点进行操作；
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button3_Click(object sender, EventArgs e)
        {
            Image<Bgr, Byte> img1 = new Image<Bgr, byte>(320, 240, new Bgr(250, 0, 0));
            Byte b1 = 255;
            Bgr yellow = new Bgr(0, 255, 255);//可以把RGB值理解成向量的叠加；

            //First
            for (int i=20;i<60;i++)
            {
                for(int j=20;j<60;j++)
                {
                    img1.Data[i, j, 0] = 0;
                    img1.Data[i, j, 1] = b1;
                    img1.Data[i, j, 2] = b1;
                }
            }

            //Second
            for(int i=120;i<160;i++)
            {
                for(int j=20;j<60;j++)
                {
                    img1[i, j] = yellow;
                }
            }

            //Third
            byte[, ,] data = img1.Data; //只传递地址；
            for(int i=20;i<60;i++)
            {
                for(int j=120;j<160;j++)
                {
                    data[i, j, 0] = 0;
                    data[i, j, 1] = b1;
                    data[i, j, 2] = b1;
                }
            }
            pictureBox1.Image = img1.ToBitmap();
        }
        /// <summary>
        /// 图像叠加；
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button4_Click(object sender, EventArgs e)
        {
            Image<Bgr, Byte> imgBlue = new Image<Bgr, byte>(320, 240, new Bgr(255, 0, 0));
            Image<Bgr, Byte> imgGreen = new Image<Bgr, byte>(320, 240, new Bgr(0, 255, 0));
            Image<Bgr, Byte> imgRed = new Image<Bgr, byte>(320, 240, new Bgr(0, 0, 255));

            Image<Bgr, Byte> img1 = imgBlue + imgGreen + imgRed;
            pictureBox1.Image = img1.ToBitmap();
        }
        /// <summary>
        /// 对每个像素点进行变换；
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button5_Click(object sender, EventArgs e)
        {
            //you need choose a gray picture
            Image<Gray, Byte> imgGray = new Image<Gray, byte>("E:\\testpictures\\rice.png");
            //single  是单精度浮点数
            Image<Gray, Single> img1 = imgGray.Convert<Single>(
                delegate(Byte b)
                {
                    return (Single)Math.Sin(b * b / 255.0);
                }
            );
            pictureBox1.Image = img1.ToBitmap();
            img1.Dispose();//如果不加这个，系统也会自动注销图片，但是尽量手动注销；

        }

        /// <summary>
        /// Image转换为XML
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button6_Click(object sender, EventArgs e)
        {
            string strFileName = string.Empty;
            OpenFileDialog ofd = new OpenFileDialog();
            if(ofd.ShowDialog()==DialogResult.OK)
            {
                Image<Bgr, Byte> img1 = new Image<Bgr, byte>(ofd.FileName);
                pictureBox1.Image = img1.ToBitmap();
                
                //注意引用systom.xml和 io等；
                StringBuilder sb1 = new StringBuilder();
                (new XmlSerializer(typeof(Image<Bgr, Byte>))).Serialize(new StringWriter(sb1), img1);

                XmlDocument xmlDoc = new XmlDocument();
                xmlDoc.LoadXml(sb1.ToString());

                xmlDoc.Save("image.xml");
                   
                   
            }
        }

        /// <summary>
        /// XML转换为image,需要加载xml文件，我用的是上个按钮生成的xml文件；
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>

        private void button7_Click(object sender, EventArgs e)
        {


            string strFileName = string.Empty;
            OpenFileDialog ofd = new OpenFileDialog();
            if (ofd.ShowDialog() == DialogResult.OK)
            {

                XmlDocument doc = new XmlDocument();
                doc.Load(ofd.FileName);

                Image<Bgr, Byte> img1 = (Image<Bgr, byte>)
                    (new XmlSerializer(typeof(Image<Bgr, Byte>))).Deserialize(new XmlNodeReader(doc));
           
                pictureBox1.Image = img1.ToBitmap();

            }
        }


    }
}

运行结果：

第二个程序完。