Explain one-hot encoding
Method for image classification
Consider a problem with 𝐶 distinct classes, then class c_i 𝑤𝑖𝑡h 𝑖 = 1, ... , 𝐶 is represented as vector 𝑦 ∈ R^c where the 𝑖th element is set 1 and all other elements are 0.
Explain beam divergence. Which capturing modes exist?
Reflectivity
Diffuse reflection
Retroreflectors
Ideal reflection
Laser scanners measure reflectivity of a surface independent of laser power and distance
Diffuse reflection surfaces (street, walls, ...) report values from 0 to 100
Retroreflectors (traffic signs, license place, ...) report values from 101 to 255
An ideal reflection would report 255
Laser beams that are shot skywards or exceed the scanner’s maximal range do not result in a measurement
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