Method for real-time detection of length and width size distribution of crystal population in glass crystallizer by binocular telecentric cameras

Abstract

A method for real-time detection of length and width size distribution of a crystal population in a glass crystallizer by binocular telecentric cameras. A calibration pole that can extend into an in-situ environment (reactor/glass tube) is designed; a binocular telecentric stereo vision imaging model is established; a simple calibration method of a rotating calibration pole suitable for an in-situ limited space and a calibration plate design solution are proposed. A simplified telecentric stereo epipolar rectification method is also provided to ensure the accurate matching of in situ snapshot image pairs. A three-dimensional reconstruction method by ray intersection based on analytical solutions is provided to measure the three-dimensional postures of particles in a crystallizer. Finally, the three-dimensional length and width are quantitatively evaluated through the statistical data of the Euclidean distances of length and width feature point pairs of crystals.