Physical AI Lab // Episode 1.3 // Quiz
Sensors: look, measure, touch
Cameras, depth, force and touch
01
A robot recognises the cup with its colour camera, but its hand keeps closing just short of the cup and grabbing air. What is most likely missing?
Depth: how far the cup really is from the hand
Higher colour resolution to see the cup in more detail
Torque sensors in the joints to feel a collision
A touch pad to feel the texture of the cup's wall
02
On one device the colour camera has 12 million pixels, while the depth camera has only about 1 million. What is the most reasonable reading of this gap?
The depth camera is poorly made and should be replaced
Each point in the depth image also stores a colour
In fact the depth stream is finer than the colour one
Depth is for outlines and distance; coarser is enough
03
A depth camera looks at a shiny stainless-steel kettle, and the kettle's body shows up as a big hole in the depth image. What is the most likely cause?
The kettle is silver, and depth cameras only see coloured things
The depth stream's resolution is too low to see the kettle
Reflections spoil the depth reading and leave a hole
The colour and depth cameras were not aligned beforehand
04
The robot has picked up a cup, and the cup starts to slip slowly downward. According to the episode, which sensor can feel this slip directly?
The colour camera sees the cup's position change
The depth camera measures the cup moving away
Joint torque sensors register a change in force
The touch sensor feels the cup slipping
05
All of the arm's cameras are blocked. Can it still know where each of its joints is?
No; its pose can only be seen by a camera from outside
Yes; joint encoders provide proprioception
Yes; the depth camera estimates the arm's pose
No; torque sensors work only during collisions
Check