工业用边界跟踪函数，已经过多个项目的实践测试与完善。可对8位非二值图直接进行处理，返回图像中元素的边界，并且为单像素-Industrial border tracking function, several projects have been testing and improving practice. Be on the 8-bit non-binary image processing directly to return the image boundary elements, and single-pixel