边缘滤波及检测，利用二个低通邻域平均模板（3×3和9×9）对一幅图象进行平滑，利用一个低通模板对一幅有噪图像（GAUSS白噪声）进行滤波 ，比较领域平均滤波和中值滤波对噪声滤波效果的影响。-Edge filtering and detection, the use of two low-pass neighborhood average template (3 × 3 and 9 × 9) of an image smoothing filtering template, the use of