Dectect where to grasp the trash bag from

[robertocaiwu]

Ideally, the robot should pick the trash bag from a specific part so that we can decrease the probability of damaging or tearing the trash bag.

Context

For the Take out the garbage [#110] task, the rulebook states that tearing the bag will result in a score reduction of 50 point for each bag. Having a way to detect the ideal place from were to grasp the trash bag should decrease the chance of it tearing.