如何在C＃中的圖像中找到像素座標？

Question

我想開發一個降噪工程，所以 如何找到圖像中的像素座標。

Answer 1

像素僅僅是位於笛卡爾座標系中某個位置的顏色，爲了在圖像中輕鬆讀取和寫入這些顏色，可以使用Bitmap class，使用GetPixel和SetPixel方法。

Answer 2

可以嘗試這

Bitmap bmp = new Bitmap("filename"); 
//to get the pixel color 
Color c= bmp.GetPixel(50,50); 
//to set the color of the pixel 
bmp.SetPixel(50, 50, Color.Green); 

以下的代碼給你在圖像中的所有像素座標

namespace WindowsFormsApplication4 
{ 
    using System.Collections.Generic; 
    using System.Drawing; 
    using System.Windows.Forms; 

    public partial class Form1 : Form 
    { 
     private const string FILE_NAME = @"C:\Temp\Capture.png"; 
     private const double BW_THRESHOLD = 0.5; 
     private readonly Color colorBlack = 
      Color.FromArgb(255, 0, 0, 0); 
     private readonly Color colorWhite = 
      Color.FromArgb(255, 255, 255, 255); 
     private readonly Bitmap originalImage; 
     private readonly Bitmap convertedImage; 
     private readonly List<Vertex> vertices = new List<Vertex>(); 
     public Form1() 
     { 
      InitializeComponent(); 
      pictureBox1.ImageLocation = FILE_NAME; 
      this.originalImage = new Bitmap(FILE_NAME); 
      this.convertedImage = this.Img2BW(this.originalImage, BW_THRESHOLD); 
      foreach (Vertex vert in this.vertices) 
      { 
       listBox1.Items.Add(vert.ToString()); 
      } 
     } 
     private Bitmap Img2BW(Bitmap imgSrc, double threshold) 
     { 
      int width = imgSrc.Width; 
      int height = imgSrc.Height; 
      Color pixel; 
      Bitmap imgOut = new Bitmap(imgSrc); 
      for (int row = 0; row < height - 1; row++) 
      { 
       for (int col = 0; col < width - 1; col++) 
       { 
        pixel = imgSrc.GetPixel(col, row); 
        if (pixel.GetBrightness() < threshold) 
        { 
         this.vertices.Add(new Vertex(col, row)); 
         imgOut.SetPixel(col, row, this.colorBlack); 
        } 
        else 
        { 
         imgOut.SetPixel(col, row, this.colorWhite); 
        } 
       } 
      } 
      return imgOut; 
     } 
    } 
    public class Vertex 
    { 
     public Vertex(int i, int j) 
     { 
      this.X = i; 
      this.Y = j; 
     } 
     public int X { get; set; } 
     public int Y { get; set; } 
     public string ToString() 
     { 
      return string.Format("({0}/{1})", this.X, this.Y); 
     } 
    } 
}