A tool for range sensing and environment discovery (5),
laser technique improves safety (6), and LaserCane (7)
uses laser distance measurement techniques. This detection
has a limited coverage, which is hazardous due to
blind spots. Obstacle Detection and Warning System by
Acoustic Feedback approach (8) presents a stereo camera
vision system to detect potential obstacles in 3D indoor
and outdoor scenarios. In particular, it uses a stereo
audio feedback with different frequencies to represent the
presence of obstacles. Despite the reported performance,
this device needs to be improved upon so that the main
components fit into a smaller device.