C# + WinForm + EmguCV 学习二：创建和操作图片

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();

}
}

}
}