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

An O-ring and visual measurement technology, applied in the field of visual measurement, can solve problems such as limitations, easy introduction of errors, and increase in the complexity of the calibration algorithm, achieving the effect of obvious contrast and simple re-calibration

Pending Publication Date: 2021-10-26
BEIJING MECHANICAL EQUIP INST
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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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  • O-shaped sealing ring size measurement method based on monocular vision
  • O-shaped sealing ring size measurement method based on monocular vision
  • O-shaped sealing ring size measurement method based on monocular vision

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Embodiment Construction

[0037] The present invention will be further described in detail below in conjunction with specific embodiments. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies realized based on the above contents of the present invention are covered within the scope of protection intended by the present invention.

[0038] The O-ring size measurement method based on monocular vision provided by the present invention, such as Figure 4 As shown, it specifically includes the following steps:

[0039] Step 1. Use a 6-megapixel baslerUSB industrial camera, an industrial lens, a Win7 computer, and a ring LED light source to build a visual measurement system for sealing rings, and calibrate the visual measurement system;

[0040] Step 2, collecting the image information of the O-ring, and preprocessing the image information to...

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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...

Claims

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Application Information

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IPC IPC(8): G06T7/62G06T7/13G06T7/136G06T7/80G06T5/00G06T7/194
CPCG06T7/62G06T7/13G06T7/136G06T7/80G06T7/194G06T2207/20032G06T5/70
Inventor 吴燕城蒋科
Owner BEIJING MECHANICAL EQUIP INST
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