通过四元数和SOF对焊接的图像进行训练，从而使焊接的图形的边缘被保留，可以实现彩色图像的边缘提取-By quaternion and SOF welding training images, so that the weld edges are retained graphics, can achieve a color image edge detection

It is important to detect the edges of the image.It is not better than canny.