有没有一种更快的方法可以使用Emgu CV(openCV包装器)按颜色检测对象

下面的代码需要几秒钟，我想更快地通过颜色检测对象，以便可以实时显示。

grayImg = input.InRange(new Bgr(selectionRangeSlider1.SelectedMin,
                                selectionRangeSlider2.SelectedMin,
                                selectionRangeSlider3.SelectedMin),
                                new Bgr(selectionRangeSlider1.SelectedMax,
                                        selectionRangeSlider2.SelectedMax,
                                        selectionRangeSlider3.SelectedMax));  

selectionRangeSlider 是一个自定义控件，在 1 个值行上有 2 个滑块

Rectangle roi; //this rectangle is the product of rectangle recognition, now I want to check if the color of this recangle is at least 50% yellow
int whitePixels = 0;
for (int i = roi.X; (i < (roi.X + roi.Width)); i++)
{
    for (int j = roi.Y; (j < (roi.Y + roi.Height)); j++)
    {
        Byte currentVal = g.Data[i, j, 0];
        if (currentVal == 255) //255 means true: this pixel is yellow
        {
            Console.WriteLine(i + "," + j + " is yellow");
            whitePixels++;
        }
    }
}
if (whitePixels > ((roi.Width * roi.Height) / 2))
{
    // "more that half is yellow";
}