说明：  模拟图像边缘检测的C代码[原创]先把图像放大K倍，然后检测边缘。使用Roberts梯度检测法。该方法在边缘附近有失真，产生伪边缘。
(simulation Edge Detection of C code [original] first image amplification K times, and then detected edge. Use Roberts gradient detection. The method is near the edge of distortion, pseudo-edge.)