| Input: , , R, offset |
| Output: The coordinates of the target point |
| Calculate the number of the reference points with the degree of and , |
| denoted as and , respectively. |
| if=, then |
| if, then |
| Find the set , where is a reference point of degree |
| and m is the number of the reference points of degree in . |
| Obtain the all candidate set , where is a candidate set which |
| contains three reference points. One is the reference point of degree , the others |
| are any two points in the R. |
| else |
| Select the reference points with degree , and |
| as the candidate set C. |
| else |
| if, then |
| Find the set , where is a reference point of degree |
| and m is the number of the reference points of degree in . |
| Obtain the all candidate set , where is a candidate set which |
| contains three reference points. One is the reference point of degree in R, the |
| others are two points with degree of . |
| else |
| The will be used as the radius and recalculate the degrees of each |
| reference point according to the procedure in step 3, the repeat the operation of steps 1 to |
| 11. |
| if, then |
| Find all the reference points of , three of three combinations as the |
| candidate set C. |
| According to all the candidate set C, calculate the perimeter of the triangle enclosed by the |
| reference point in the set, select the set of reference points with the shortest perimeter, and |
| find the center of the triangle as the coordinate of the point to be measured. |
| return result. |
