Polarization imaging-based three-dimensional measurement method of ice shape

Abstract

The invention proposes a polarization imaging-based three-dimensional measurement method of an ice shape. The polarization imaging-based three-dimensional measurement method comprises the steps of lighting the ice shape by a linear polarization light source, shooting a laser strip by a polarization camera, and scanning an ice surface by a rotation table rack; calibrating a linear laser visual sensor; calibrating a rotation table; and extracting a central line of the laser strip by an imaging processing method, and calculating three-dimensional coordinate of the central line of the laser stripin a world coordinate system. By the method, a favorable theory and technical foundation is laid for on-line three-dimensional measurement of the ice shape.

Description

Technical field [0001] The invention relates to the fields of optical three-dimensional measurement and computer vision, in particular to an ice shape three-dimensional measurement method based on polarization imaging. Background technique [0002] Aircraft icing is widespread in flight practice and poses a serious threat to flight safety. It not only disrupts the smooth flow of air and increases flight resistance, but also changes the aerodynamic characteristics of the wings, causing rudder surface control failures or reverse effects. The icing on different parts of the aircraft may affect the safe flight of the aircraft. Almost all icing research now starts from measuring the shape of the icing on the surface of the aircraft in the icing wind tunnel. [0003] So far, the main methods for measuring the icing shape of aircraft are: profile method, photogrammetry, mold method, and laser line scanning method. The above methods have their advantages, but they also have limitations. ...

AI Technical Summary

Problems solved by technology

However, the extraction error of the laser center line still restricts the measurement accuracy. This is due to the high transparency and smooth surface of the ice body, and the strong laser penetration ability. When the line laser is projected on the surface of the ice body, most of the light is projected on the ice body, and only a small part of the light is projected on the ice body. Reflected by the surface of the ice body, the laser band area of ​​the collected image is severely diffused, and it is shown as a bright spot area on the image

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