using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Emgu.CV;
using Emgu.CV.CvEnum;
using Emgu.CV.Structure;

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

        private void button1_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();
                //轉成灰度圖
                Image<Gray, Byte> gray1 = img1.Convert<Gray, Byte>();
                //Canny 邊緣檢測
                Image<Gray, Byte> cannyGray = gray1.Canny(120, 180);
                pictureBox2.Image = cannyGray.ToBitmap();
            }
        }

        private
 
 void button2_Click(object sender, EventArgs e)
        {
            //從pictureBox2中載入影象
            Image<Gray, Byte> cannyGray = new Image<Gray, byte>(new Bitmap(pictureBox2.Image));
            //呼叫 HoughLinesBinary檢測直線 ，返回一個 LineSegment2D[][]陣列
            LineSegment2D[] lines = cannyGray.HoughLinesBinary(1, Math.PI / 45.0, 20, 30, 10)[0];
            //畫線
            Image<Bgr, Byte> imageLines = new Image<Bgr, byte>(cannyGray.Width, cannyGray.Height);
            //遍歷二維直線陣列
            foreach (LineSegment2D line in lines)
            {
                ///在imageLines上將直線畫出
                imageLines.Draw(line, new Bgr(Color.DeepSkyBlue), 5);
            }
            //顯示結果
            pictureBox2.Image = imageLines.ToBitmap();
        }

        private void button3_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();
                //轉灰度圖
                Image<Gray, Byte> gray1 = img1.Convert<Gray, Byte>();
                //呼叫HoughCircles (Canny included)檢測圓形
                CircleF[] circles = gray1.HoughCircles(
                    new Gray(180),  //cannyThreshold
                    new Gray(120),  //accumulatorThreshold
                    2.0,            //dp
                    15.0,           //minDist
                    5,              //minRadius
                    0               //maxRadius
                    )[0];
                //畫圓
                //img1.CopyBlank()直接複製上一步建立的空白影象
                Image<Bgr, Byte> imageCircles = img1.CopyBlank();
                foreach (CircleF circle in circles)
                {
                    imageCircles.Draw(circle, new Bgr(Color.Yellow), 5);
                }
                //顯示結果
                pictureBox2.Image = imageCircles.ToBitmap();
            }
        }
    }
}