C# 利用Aforge进行墙体裂缝检测

我正在尝试使用一个RGE来检测墙壁开裂，下面是我的代码。 如何突出显示原始图片中的裂缝，以及是否有更好的代码来检测墙壁裂缝？ 我该如何测量裂缝的长度和宽度

 Bitmap temp = (Bitmap)org.Clone();
        // create grayscale filter 
        Grayscale filter_grayscale = new Grayscale(0.299, 0.587, 0.114);
        temp = filter_grayscale.Apply(temp);
        // create thresholding filter
        Threshold filter = new Threshold(120);
        filter.ApplyInPlace(temp);
        // create filter
        CannyEdgeDetector filter_edge = new CannyEdgeDetector();
        filter_edge.ApplyInPlace(temp);

        // create filter
        Invert filter_invert = new Invert();
        filter_invert.ApplyInPlace(temp);
        // create and configure the filter
        FillHoles filter_hole = new FillHoles();
        filter_hole.MaxHoleHeight = 20;
        filter_hole.MaxHoleWidth = 20;
        filter_hole.CoupledSizeFiltering = false;
        filter_hole.ApplyInPlace(temp);

        pictureBox2.Image =temp;