位图检测

Question

我目前有一个代码可以在此程序截取的屏幕截图中搜索位图，但是，位图在屏幕截图中存在三次，我希望它在第二次找到时点击。

有没有办法做到这一点？非常感谢...

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);
}

不知道这是否真的有帮助，我想要它做的就是点击它找到的第二个位图。

一位朋友确实建议将我的屏幕截图拆分为网格，然后这样做，为什么，要做网格还是可以找到第二个位图？

更新：说我的屏幕上有5张完全相同的图片。我希望我的程序单击它找到的第三个位图。

Answer 1

最简单的方法是引入一个计数器，显示图片被发现的次数。不知怎的，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;
}

虽然你应该真正研究图像检测技术。有些库允许这样做更容易。