O-shaped sealing ring size measurement method based on monocular vision

Abstract

The invention provides an O-shaped sealing ring size measurement method based on monocular vision, and the method comprises the steps: carrying out the calibration through designing a calibration plate drawn with a square black and white checkerboard after a vision measurement system is built, thereby building a mapping relation of space coordinates between a target image and a real object; the technical problem that in the prior art, when a standard size element or a scale image is used as a calibration object, the measurement result is inaccurate due to the tolerance or precision of the calibration object is solved. The contrast ratio between the black and white checkerboard and the background in the image is more obvious, and the complexity of algorithms such as image filtering, image segmentation and image edge extraction is obviously reduced. Size measurement of a plurality of sealing rings is synchronously carried out while system calibration is completed, and when the distance between the camera and the calibration plate is changed, re-calibration of the vision measurement system is simpler.

Description

technical field [0001] The invention belongs to the technical field of visual measurement, and in particular relates to a method for measuring the size of an O-shaped sealing ring based on monocular vision. Background technique [0002] As an emerging high-tech, visual measurement has broad application prospects in the field of industrial inspection due to its unique advantages of non-contact, real-time, and high precision. Among them, monocular visual measurement refers to the use of only one visual sensor to collect A way to image and measure the geometric dimensions of objects. Monocular vision measurement has a simple structure and few calibration steps. Research in this field has been active in recent years. [0003] In some existing technical schemes that use monocular vision to measure the size of the sealing ring, a standard rubber sealing ring is selected, and the inner and outer diameters are accurately measured with a vernier caliper, and then the image of the st...

AI Technical Summary

Problems solved by technology

This scheme improves the calibration accuracy by using the size of the standard linear ruler as the actual reference standard ruler, but increases the complexity of the calibration algorithm in terms of image segmentation and scale edge extraction of the linear ruler, and the actual measurement accuracy is limited by the scale accuracy of the linear ruler. easy to introduce error

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