A Machine Vision-Based Detection Method for Impairment Defects in Elevator Compensation Chain

Abstract

The invention discloses a machine vision-based method for detecting scuff defects of elevator compensation chains, which is characterized in that it includes the following steps in sequence: S1, for the collected original grayscale images, using image partitioning technology to extract the interesting points in the middle of the chain body area; S2. Perform texture analysis on the region of interest to obtain the texture analysis image, and then use the watershed algorithm to segment the texture analysis image to obtain the segmented area after performing mean filtering; S3. Extract the morphological features of the segmented area and make a preliminary determination of defects; The first threshold segmentation and skeleton extraction are performed for the texture analysis image corresponding to the segmented region with defects, and the second determination of defects is performed. The method of the invention can quickly and accurately detect the damage defect of the elevator compensation chain, has strong applicability, low cost and is suitable for industrialization.

Description

technical field [0001] The invention relates to a defect detection method of an elevator compensation chain, in particular to a machine vision-based detection method for a scuff defect of an elevator compensation chain. Background technique [0002] my country is the world's largest producer and consumer of elevators. The huge elevator market has promoted the vigorous development of the elevator parts industry. The elevator balance compensation chain is one of the key components that balance the operation of the elevator. It is used to balance the weight of the traction wire rope and accompanying cables during the movement of the elevator car to ensure the stability and safety of the elevator operation. As my country's elevator market enters a period of equal emphasis on new installations and maintenance, a large number of old elevators need to be replaced with compensation chains every year. Therefore, there is a huge market demand for elevator balance compensation chains....

AI Technical Summary

Problems solved by technology

[0006] 1. Each link is continuous, adjacent links are staggered, and the surface of the link is a curved surface. Bruise defects usually occur in the middle of the chain body, but the position is not fixed. If multiple groups of structured light solutions are used, the cost will be too high and uneconomical

[0007] 2. The surface of the chain body is reflective and is a rough surface. The gray value of the impact defect is close to that of the surrounding chain body surface, the contrast is low, and the edge is blurred and difficult to close. It is difficult to extract by conventional image processing methods

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