位图检测

Question

我目前有一个代码，它将在该程序截图中搜索位图，但是，位图在截图中存在三次，我希望它在第二次找到它时单击。

有没有办法做到这一点？提前很多感谢的......

代码：

private Bitmap Screenshot() 
{ 
    Bitmap bmpScreenShot = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height); 
    Graphics g = Graphics.FromImage(bmpScreenShot); 
    g.CopyFromScreen(0, 0, 0, 0, Screen.PrimaryScreen.Bounds.Size); 
    return bmpScreenShot; 
} 

private bool FindBitmap(Bitmap BmpNeedle, Bitmap BmpHaystack, out Point location) 
{ 
    for (int outerX = 0; outerX < BmpHaystack.Width - BmpNeedle.Width; outerX++) 
    { 
     for (int outerY = 0; outerY < BmpHaystack.Height - BmpNeedle.Height; outerY++) 
     { 
      for (int innerX = 0; innerX < BmpNeedle.Width; innerX++) 
      { 
       for (int innerY = 0; innerY < BmpNeedle.Height; innerY++) 
       { 
        Color cNeedle = BmpNeedle.GetPixel(innerX, innerY); 
        Color cHaystack = BmpHaystack.GetPixel(innerX + outerX, innerY + outerY); 
        if (cNeedle.R != cHaystack.R || cNeedle.G != cHaystack.G || cNeedle.B != cHaystack.B) 
        { 
         continue; 
        } 
       } 
      } 
      location = new Point(outerX, outerY); 
      return true; 
     } 
    } 
    location = Point.Empty; 
    return false; 
} 

public void findImage() 
{ 
    Bitmap bmpScreenshot = Screenshot(); 
    Point location; 
    bool success = FindBitmap(Properties.Resources.xxx, bmpScreenshot, out location); 
} 

不知道是不是真的有帮助，我想要它做的就是点击它找到了第二位。

一位朋友确实建议将我的屏幕截图分割成网格，并做到这一点，为什么要做网格的路要走，还是有可能找到第二个位图？

更新：假设我的屏幕上有5个完全相同的图像。我想让我的程序点击找到的第三个位图。

Answer 1

最简单的方法就是引入一个显示图片被找到的次数的计数器。不知怎的，像这样：

private bool FindBitmap(Bitmap BmpNeedle, Bitmap BmpHaystack, out Point location) 
{ 
    int countTimesFound = 0; 
    for (int outerX = 0; outerX < BmpHaystack.Width - BmpNeedle.Width; outerX++) 
    { 
     for (int outerY = 0; outerY < BmpHaystack.Height - BmpNeedle.Height; outerY++) 
     { 
      for (int innerX = 0; innerX < BmpNeedle.Width; innerX++) 
      { 
       for (int innerY = 0; innerY < BmpNeedle.Height; innerY++) 
       { 
        Color cNeedle = BmpNeedle.GetPixel(innerX, innerY); 
        Color cHaystack = BmpHaystack.GetPixel(innerX + outerX, innerY + outerY); 
        if (cNeedle.R != cHaystack.R || cNeedle.G != cHaystack.G || cNeedle.B != cHaystack.B) 
        { 
         continue; 
        } 
       } 
      } 
      countTimesFound++; 
      if (countTimesFound == 2) 
      { 
       location = new Point(outerX, outerY); 
       return true; 
      } 
     } 
    } 
    location = Point.Empty; 
    return false; 
} 

虽然你应该真的看看图像检测技术。有些库可以让这样做更容易。