找blob并计算所有相关的信息（最大最小x值、中心、长度、宽度等）-find blob and calcaulate relative message(length,width,center)

根据输入的三点判断此三点能不能构成一个圆。若能，则输出圆心坐标和半径；若不能，则提示出错信息。-The input of the three judges that this point can not form a circle. If, then the center coordinates and radius of the output if not, then prompts an error message.