Calibration method, device and application of structured light system based on red and blue orthogonal stripes

Abstract

The invention discloses a structured light system calibration method, device and application based on red and blue orthogonal stripes. The method includes: (1) building a calibration device; (2) generating fringe images by encoding; (3) modulating the fringe images to different color channels; (4) adjusting the brightness of the red and blue orthogonal fringe images; (5) calculating the red and blue orthogonal Phase of fringe image; (6) Calibration of structured light system. The device includes a computer, a color CCD camera, a projector and an LCD display screen with a holographic projection film; the camera and the projector are located on the same horizontal plane; the LCD display screen is set in the depth of field of the camera to ensure that the camera, The projector and the LCD display screen are spatially triangulated; the computer is connected to the LCD display screen, the camera, and the projector, respectively. The calibrated structured light system can be used for three-dimensional topography measurement. The method has the advantages of fast calibration speed, high precision, ingenious design and low hardware cost.

Description

technical field [0001] The invention relates to the field of three-dimensional shape measurement, in particular to a calibration method, device and application of a structured light system based on red and blue orthogonal stripes. Background technique [0002] Three-dimensional shape measurement is of great significance in many different fields, including medical systems, cultural heritage records, artificial intelligence, industrial online inspection, automotive ships, aerospace, etc. Existing 3D topography methods consist of stereo vision, laser scanning, interferometry, and structured light methods. Among these methods, structured light-based fringe projection profilometry is one of the most promising technologies due to its advantages of full-field acquisition, non-contact, low cost, high speed, and high precision. The structured light system composed of cameras and projectors is widely used in 3D scene reconstruction and navigation, target recognition and tracking, and...

AI Technical Summary

Problems solved by technology

The internal and external parameters of the system can only be calculated by these low-precision and limited number of feature points, resulting in insufficient calibration accuracy; moreover, the calibration plate can only be one pattern during the calibration process, and the operation is not flexible enough; the method of using movement is highly dependent on The accuracy of the horizontal moving platform, and the calibration process is cumbersome and time-consuming; the method of calibrating the camera first and then the projector, the calibration accuracy of the projector is highly dependent on the calibration accuracy of the camera, so the calibration results of the system will also be affected

Images