关于blob赋值给变量的问题

[uey4]

def find_bluemax(blobs,cox,coy,cw,ch):   
     max_sizes=0
     global min_blob
     for blob in blobs:
         if blob[0]>=cox and blob[1]>=coy and blob[3]<=ch and blob[2]<=cw and blob[0]<=(cox+cw) and blob[1]<= (coy+ch) and blob[4]>=100:
             if blob[2]*blob[3] > max_sizes:
                min_blob=blob
                max_sizes = blob[2]*blob[3]
     return min_blob

程序逻辑不用看，就一个问题，blob赋值min_blob（一开始以为变量定义的名字错误，然后瞎改的）系统提示说min_blob没有定义

[kidswong999]

http://book.openmv.cc/project/zhui-xiao-qiu-de-xiao-8f665d28-project-pan-tilt-md.html#调整参数，实现跟随

看我写的find_max函数