Ok, i found a solution. Here it is;
1-)I have divided the screen into 4 horizontal parts. Each part represents 0.75m gap that is sufficient to pass through easily by average human.
2-)To navigate user safe side, i count the number of points for each side (left or right).
3-)After 2nd step is done, i know the side that has few points. Then, in the side that has few points, i perform a sub-control. For example, if the right side has few points, then i calculate points in right side's sub sides (close right,far right).
4-) Finally, the sub-side that has less points then the other sub side is transposed to user if it satisfies the number of points criteria ( if it contains 100 or less points)
Hope it would help someone else that is working on it.