影像邏輯運算君_學習範例

同學好~

這次教大家一些基礎影像運算


影像(Image)可視為矩陣(Matrix)

涉及一或多張影像的陣列 (array)運算
是以一個像素接一個像素 (pixel-by-pixel) 為基礎來執行。





在這裡你會看到一個詞叫做  element-wise意思就是指

element by element

影像     對應     矩陣


像素     對應    矩陣成員(element)





示例影片:




兩張圖做 加 減 乘 或是 And 、OR等等的運算


另外就是  Absdiff  和  Sub 這兩個運算用法有點不一樣



這裡提供一個範例給大家回去做試驗喔!!!


切記兩張影像的大小要一樣

最好是用一個沒有人當背景之類的


一張有人(物件)   一張沒人(物件)


來觀察喔!!!


簡單視窗布局設計

代碼示例:

using System;
using System.Windows.Forms;
using Emgu.CV;
using Emgu.CV.Structure;
using Emgu.Util;

namespace 影像四則運算
{
    public partial class Form1 : Form
    {
        Image<Bgr, byte> img1;
        Image<Bgr, byte> img2;
        Image<Bgr, byte> imgResult;

        bool grayState = false;
        Image<Gray, byte> imgGray1, imgGray2;
        Image<Gray, byte> imgGrayResult;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
        }
        private void button5_Click(object sender, EventArgs e)
        {
            grayState = true;            
            imgGray1 = img1.Convert<Gray, byte>();
            imgGray2 = img2.Convert<Gray, byte>();
            pictureBox1.Image = imgGray1.ToBitmap();
            pictureBox2.Image = imgGray2.ToBitmap();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            OpenFileDialog Openfile = new OpenFileDialog();
            if(Openfile.ShowDialog() == DialogResult.OK)
            {
                img1 = new Image<Bgr, byte>(Openfile.FileName);
                pictureBox1.Image = img1.ToBitmap();
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            OpenFileDialog Openfile = new OpenFileDialog();
            if (Openfile.ShowDialog() == DialogResult.OK)
            {
                img2 = new Image<Bgr, byte>(Openfile.FileName);
                pictureBox2.Image = img2.ToBitmap();
            }
        }

        //影像運算
        private void button3_Click(object sender, EventArgs e)
        {
            if(comboBox1.SelectedIndex == 0) //    加
            {
                if(grayState==true)
                {
                    imgGrayResult = imgGray1.Add(imgGray2);
                    pictureBox3.Image = imgGrayResult.ToBitmap();
                }
                else
                {
                    imgResult = img1.Add(img2);
                    pictureBox3.Image = imgResult.ToBitmap();
                }
            }
            if( comboBox1.SelectedIndex == 1)   //   減
            {
                if (grayState == true)
                {
                    imgGrayResult = imgGray1.Sub(imgGray2);
                    pictureBox3.Image = imgGrayResult.ToBitmap();
                }
                else
                {
                    imgResult = img1.Sub(img2);
                    pictureBox3.Image = imgResult.ToBitmap();
                }                
            }
            if(comboBox1.SelectedIndex == 2)// 乘
            {
                if (grayState == true)
                {
                    imgGrayResult = imgGray1.Mul(imgGray2);
                    pictureBox3.Image = imgGrayResult.ToBitmap();
                }
                else
                {
                    imgResult = img1.Mul(img2); 
                    pictureBox3.Image = imgResult.ToBitmap();
                }                
            }
            if (comboBox1.SelectedIndex == 3)//  AbsDiff
            {
                if (grayState == true)
                {
                    imgGrayResult = imgGray1.AbsDiff(imgGray2);
                    pictureBox3.Image = imgGrayResult.ToBitmap();
                }
                else
                {
                    imgResult = img1.AbsDiff(img2);
                    pictureBox3.Image = imgResult.ToBitmap();
                }                
            }
            if(comboBox1.SelectedIndex == 4) //  and
            {
                if (grayState == true)
                {
                    imgGrayResult = imgGray1.And(imgGray2);
                    pictureBox3.Image = imgGrayResult.ToBitmap();
                }
                else
                {
                    imgResult = img1.And(img2);
                    pictureBox3.Image = imgResult.ToBitmap();
                }                
            }
            if(comboBox1.SelectedIndex == 5) // or
            {
                if (grayState == true)
                {
                    imgGrayResult = imgGray1.Or(imgGray2);
                    pictureBox3.Image = imgGrayResult.ToBitmap();
                }
                else
                {
                    imgResult = img1.Or(img2);
                    pictureBox3.Image = imgResult.ToBitmap();
                }                
            }
            if(comboBox1.SelectedIndex == 6) // Xor
            {
                if (grayState == true)
                {
                    imgGrayResult = imgGray1.Xor(imgGray2);
                    pictureBox3.Image = imgGrayResult.ToBitmap();
                }
                else
                {
                    imgResult = img1.Xor(img2);
                    pictureBox3.Image = imgResult.ToBitmap();
                }                
            }
        }

        private void button4_Click(object sender, EventArgs e)
        {
            imgResult = null;
            pictureBox3.Image = null;
            grayState = false;
        }


    }
}

使用到的運算方法

element-wise add  對應元素數值相加

element-wise subtract 對應元素數值相減

element-wise multiply 對應元素數值相乘

計算兩影像的相減結果

element-wise AND 對應元素數值做AND運算

element-wise OR 對應元素數值做OR運算

element-wise XOR 對應元素數值做XOR運算


範例下載連結

https://www.dropbox.com/s/ev44lziv32zsju7/%E5%BD%B1%E5%83%8F%E5%9B%9B%E5%89%87%E9%81%8B%E7%AE%97.7z?dl=0