Coal bunker material level measuring method and system based on stereo vision

Abstract

The invention relates to a coal bunker material level measuring method and system based on stereo vision, and the system mainly comprises an optical subsystem, an embedded processing subsystem and a flameproof shell with a window. Light emitted from a light source module is projected on a coal surface in a coal bunker, and based on the phase delay integral principle of reflected light and emitted light, a vision sensor collects the light reflected from the coal surface and converts the light to depth images and light intensity images. A processor analyzes image data and realizes the measurement of the material level so as to stop filling and unloading coal timely. A light source drive controller adjusts the number of lighted LEDs automatically according to the intensity of returned light which is measured by an annular photometer and enables the luminous intensity to be within an appropriate range. In the measurement, the processor is used for changing the parameters of the vision sensor according to the material level and the condition of material level changing, thus realizing intelligent switching between a slow detection mode and a fast detection mode. The slow detection mode realizes high-accuracy detection; and the fast detection mode realizes fast detection.

Description

technical field [0001] The invention relates to a coal bunker material level measurement method and system based on stereo vision, which belongs to the fields of machine vision, image processing and automation, and is used for quickly and correctly obtaining three-dimensional position information of the coal bunker material level. Background technique [0002] The detection of coal bunker material level is an important measure for coal mine safety production. Vertical bottom shaft coal bunker and inclined bottom shaft coal bunker are the coal bunker forms commonly used in mines in my country at present. As coal is continuously fed into the coal bunker, the distance between the coal surface and the top of the coal bunker is getting smaller and smaller. If the coal addition is not stopped in time, it may overflow, causing coal accumulation, interrupting production, and even causing major coal mines. Accidents: If the coal drops to the specified minimum level, if the unloading ...

AI Technical Summary

Problems solved by technology

[0007]2) Poor initiative; Passive inference of 3D information from 2D images of 3D scenes is itself a "sick" problem, rather than actively obtaining 2D information of coal in the coal bunker information

[0008]3) It is not easy to deploy, and it is difficult to deploy in the limited position of underground coal bunkers, based on PC vision system, and it is difficult to realize the characteristics of safe production in coal mines

[0009]4) Poor real-time performance

Inferring three-dimensional information from two-dimensional images and calculating third-dimensional depth information requires a large amount of calculation, high speed, and poor real-time performance

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