图形 轮廓 边长计算

Question

图形的轮廓矩阵已经获取，用1来表示。  用什么矩阵扫描法可以较精确计算出 底边和 斜边的像素长度? 
                                                                                    
                                           111                                     1  11 
                         1      11                                            11  1 
                           1 1                                               111 
                                                                          1
                           111                                          1  11 
                                                                        1
                                                                     1  11 
                                                                    11 1 
                                                                  1 11 
                                                                1  11 
                                                              1 11 
                                          111               1111               
        1111111 1111 111111111 111111111111 111111111      1 111
        11 11111111111111111111  1111111  111111111111111111  
      1111 111111111111    11111111 1111111 11 111 111111111 

Answer 1

http://zhidao.baidu.com/question/237866004.html 。。 
百度知道的传送门。这里比较清晰谢谢