位圖檢測

Question

我目前有一個代碼，它將在該程序截圖中搜索位圖，但是，位圖在截圖中存在三次，我希望它在第二次找到它時單擊。

有沒有辦法做到這一點？提前很多感謝的......

代碼：

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幫助，我想要它做的就是點擊它找到了第二位。

一位朋友確實建議將我的屏幕截圖分割成網格，並做到這一點，爲什麼要做網格的路要走，還是有可能找到第二個位圖？

更新：假設我的屏幕上有5個完全相同的圖像。我想讓我的程序點擊找到的第三個位圖。

Answer 1

最簡單的方法就是引入一個顯示圖片被找到的次數的計數器。不知怎的，像這樣：

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; 
} 

雖然你應該真的看看圖像檢測技術。有些庫可以讓這樣做更容易。