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TableĀ 2 Aggregated count of participantsā€™ ratings of the difficulty of detecting various obstacles

From: User-centered design of a depth data based obstacle detection and avoidance system for the visually impaired

Obstacle Difficulty of detection
Very easy Easy Neutral Difficult Very difficult
Ascending stairs 5 1 0 2 2
Descending stairs 2 1 4 1 2
Moving obstacles 5 0 1 0 4
Very small obstacles 1 0 1 0 8
Walls 7 0 2 0 1
Chairs/tables 3 1 6 0 0
People 5 3 0 1 1