如何检查徽标/图像是否在图像中

我想将文档的图像与徽标类型或其他图片进行比较，看看徽标是否在文档中。

要做到这一点的应用程序将使用ASP.NET MVC 3和C#。

经过更多的搜索，我发现了一个使用AForge:的位图扩展解决方案

public static class BitmapExtensions
{
    /// <summary>
    /// See if bmp is contained in template with a small margin of error.
    /// </summary>
    /// <param name="template">The Bitmap that might contain.</param>
    /// <param name="bmp">The Bitmap that might be contained in.</param>        
    /// <returns>You guess!</returns>
    public static bool Contains(this Bitmap template, Bitmap bmp)
    {
        const Int32 divisor = 4;
        const Int32 epsilon = 10;
        ExhaustiveTemplateMatching etm = new ExhaustiveTemplateMatching(0.9f);
        TemplateMatch[] tm = etm.ProcessImage(
            new ResizeNearestNeighbor(template.Width / divisor, template.Height / divisor).Apply(template),
            new ResizeNearestNeighbor(bmp.Width / divisor, bmp.Height / divisor).Apply(bmp)
            );
        if (tm.Length == 1)
        {
            Rectangle tempRect = tm[0].Rectangle;
            if (Math.Abs(bmp.Width / divisor - tempRect.Width) < epsilon
                &&
                Math.Abs(bmp.Height / divisor - tempRect.Height) < epsilon)
            {
                return true;
            }
        }
        return false;
    }
}