DORN: Deep Ordinal Regression Network for Monocular Depth Estimation

January 2020

tl;dr: Regress distance via uniform log space and ordinal regression.

Overall impression

Ordinal regression is like cls, but the order matters. Directly regressing the numbers leads to slow convergence and worse performance. Ordinal regression has been used to estimate human age.

Ordinal regression converts the convetional one-hot multi-class cls (MCC) into a series of binary classification.

The idea was also corroborated in other studies such as VectorMapNet.

Key ideas

Technical details