Steel rail section profile detection method, device, apparatus, system and medium

The invention discloses a steel rail section profile non-contact detection method, device, apparatusand system and a computer readable storage medium. The method comprises the following steps: extracting characteristic pixel points on a section profile intersection line generated by intersection of each non-parallel light plane and a steel rail in a to-be-detected steel rail intersection line image; according to the camera parameters and the first optical plane parameter values, calculating coordinate values of the feature pixel points of the corresponding intersecting lines under a camera space coordinate system, and based on collinear constraints and parallel constraints satisfied by the feature pixel points, calculating other optical plane parameter values; fitting the longitudinal direction of the steel rail by utilizing the camera space coordinate values of the same type of characteristic pixel points and constructing a projection auxiliary surface vertical to the longitudinal direction of the steel rail