《学习OpenCV(中文版)》
作者：（美）布拉德斯基（Bradski，G.）
（美）克勒（Kaehler，A.） 著
出版社：清华大学出版社
出版时间：2009年10月
参考资料：https://blog.csdn.net/F_soar/article/details/123357849
https://blog.csdn.net/zanllp/article/details/79830571
一、感兴趣区域（ROI）
在图像处理过程中，我们可能会对图像的某一个特定区域感兴趣，该区域被称为感兴趣区域（Region of Interest, ROI）。在设定感兴趣区域ROI后，就可以对该区域进行整体操作。
- 打码
- 美颜
- 置换
将一个感兴趣区域A赋值给变量B后，可以将该变量B赋值给另外一个区域C，从而达到在区域C内复制区域A的目的。
二、Mat(Mat m, Rect roi);
复制一个图像的ROI到另外一个图像
三、Form窗体绘制ROI实例
namespace Ky_CvRoi
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
public string SourceFname = @"d:\2022视觉文件夹\安柏.JPG";
public Mat S0 = Cv2.ImRead(@"d:\2022视觉文件夹\安柏.JPG", ImreadModes.Unchanged);
public OpenCvSharp.Point p1 = new OpenCvSharp.Point(-1, -1);
public OpenCvSharp.Point p2 = new OpenCvSharp.Point(-1, -1);
public OpenCvSharp.Rect rect0=new OpenCvSharp.Rect(0,0,0,0);
bool mouseDown = false;
#region 定义一个发送接收图像数据的全局变量SendPicData
public Mat SendPicData
{
get { return BitmapConverter.ToMat((Bitmap)pictureBox1.Image); }
set { pictureBox1.Image = value.ToBitmap(); }
}
#endregion
private void Form1_Load(object sender, EventArgs e)
{
pictureBox1.Image = S0.ToBitmap();
}
private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
{
mouseDown = true;
if (mouseDown)
{
p1.X = e.X;
p1.Y = e.Y;
textBox1.Text = textBox1.Text + "p1=(" + e.X.ToString() + " , " + e.Y.ToString() + ")\r\n";
}
}
private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
{
OpenCvSharp.Point p0;
mouseDown = false;
int w1=0;
int h1=0;
if ((p1.X >= 0) && (p1.Y >= 0))
{
p2.X = e.X;
p2.Y = e.Y;
textBox1.Text = textBox1.Text + "p2=(" + e.X.ToString() + " , " + e.Y.ToString() + ")\r\n";
w1 = p2.X - p1.X;
h1 = p2.Y - p1.Y;
if (p2.X < p1.X)
{
w1 = p1.X - p2.X;
};
if (p2.Y < p1.Y)
{
h1 = p1.Y - p2.Y;
}
}
rect0 = new OpenCvSharp.Rect(p1.X, p1.Y, w1, h1);
OpenCvSharp.Scalar scalar = new OpenCvSharp.Scalar(0, 200, 200);
// 画矩形
S0.Rectangle(p1, p2, scalar,2);
pictureBox1.Image = OpenCvSharp.Extensions.BitmapConverter.ToBitmap(S0);
}
private void button2_Click(object sender, EventArgs e)
{
string path = @"d:\2022视觉文件夹\安柏.JPG";
pictureBox1.Image = new Bitmap(path);
S0 = new Mat(path);
pictureBox1.Image = OpenCvSharp.Extensions.BitmapConverter.ToBitmap(S0);
}
private void button1_Click(object sender, EventArgs e)
{
OpenCvSharp.Rect roi = rect0;
Mat ImageROI = new Mat(S0, roi);//新建一个mat，把roi内的图像加载到里面去
pictureBox2.Image = OpenCvSharp.Extensions.BitmapConverter.ToBitmap(ImageROI);
}
}
}
