Gauge detection ranging method and system based on camera and controllable stroboscopic light source

Abstract

The invention discloses a gauge detection ranging method and system based on camera and controllable stroboscopic light source; when a train runs, frame frequency of a CMOS (complementary metal oxide semiconductor) camera and flashing frequency of a stroboscopic light source are adjusted so that the stroboscopic light source strobes many times within one frame of the exposure period of the CMOS camera, and a detection subject smaller than one-third of a visual field of the CMOS camera is periodically imaged within the same frame of the CMOS camera; the periodic image is subjected to Fourier transform, amplitude at specific frequency in an amplitude spectrum curve is maximum, a frequency corresponding to the maximum value is the number of pixels between repeated images of the detection subject within the strobing period, and a distance between the repeated images is acquired by multiplying the number of pixels between the repeated images of the detection subject within the stroking period by a length of each pixel of the camera; a distance to the detection subject is calculated according to the imaging principle of camera, and the method has high measuring precision and accuracy and is suitable for high-speed online detection of a railway.

Description

technical field [0001] The invention relates to the technical field of railway limit detection, in particular to a limit detection and ranging method and system based on a CMOS area array camera and a controllable frequency light source. Background technique [0002] Railway limit detection has always been highly valued by relevant railway departments, and it plays a vital role in improving railway transportation safety and transportation efficiency. At present, the test methods of limit detection mainly include contact limit detection and non-contact limit detection. [0003] In the early days of limit detection, the limit detection and ranging systems at home and abroad generally adopted the contact type, mainly including the mechanical tentacle type and the detection frame type. These two methods are to install a frame on the detection car, and during operation, the limit detection is realized by recording the contact between the frame and the surrounding objects. The de...

AI Technical Summary

Problems solved by technology

The general stereo vision detection technology based on point matching of the same name has complex algorithms, difficult matching, limited frame rate and huge amount of data calculation. It can get better results in the case of low speed and fixed detection objects, but it is difficult to meet the requirements of high speed and changing environment.

The triangular ranging limit detection method has the advantages of higher detection accuracy, denser circumferential sampling points and higher longitudinal sampling frequency, but the limit detection speed is faster, there are more vertical and horizontal measuring points, and the amount of data is large. The switching speed of each unit on the board cannot meet the requirements, making it difficult to achieve high-speed online detection

Images