Method for measuring size of maximum point of least square ellipse fitting piston skirt

A least square method and ellipse fitting technology, which is applied in image data processing, instrumentation, calculation, etc., to achieve the effects of improving measurement accuracy, strong algorithm adaptability, and improving accuracy

Inactive Publication Date: 2019-12-06
XI AN JIAOTONG UNIV
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Problems solved by technology

[0006] The measured piston adopts a vertical posture, and the method based on sub-pixel edge detection and ellipse fitting based on the least square method can be used to realize the measurement of the maximum point of the piston. At present, there is no combination of sub-pixel edge detection and Combination of ellipse fitting method of least squares method for measurement at the maximum point of the piston skirt is disclosed in the literature

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  • Method for measuring size of maximum point of least square ellipse fitting piston skirt
  • Method for measuring size of maximum point of least square ellipse fitting piston skirt
  • Method for measuring size of maximum point of least square ellipse fitting piston skirt

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Embodiment Construction

[0027] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0028] refer to figure 1 , the method for measuring the size at the maximum point of the piston skirt by least squares ellipse fitting, comprising the following steps:

[0029] Step 1), collecting the top-view image of the piston in a vertical state: Since the size of the largest point of the piston skirt is the largest size in the piston, and the cross-section of the piston skirt is an ellipse, the image of the piston in the vertical state of the piston is collected, and the image The maximum size measured in is the size at the largest point of the skirt;

[0030] Step 2), carry out sub-pixel edge detection to the piston image:

[0031] 2.1) Perform pixel-level edge detection on the collected piston image to obtain the pixel-level edge of the piston image;

[0032] 2.2) Carry out subpixel-level edge detection subdivision on the pixel-level edge, e...

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Abstract

A method for measuring the size of the maximum point of least square ellipse fitting piston skirt comprises the steps that a top view of a piston in a vertically-placed state is collected, pixel-leveledge detection is conducted on the top view, sub-pixel-level edge detection is conducted, ellipse fitting based on a least square method is conducted on collected sub-pixel edge points, and ellipse parameters are calculated; and angle correction is carried out on the fitted ellipse through the long-axis rotation angle parameter, edge point screening is carried out, ellipse fitting is carried outon the screened edge points, and the long axis of the ellipse, namely the size of the maximum point of the skirt part is calculated. The size of the maximum point of the piston skirt is measured, andthe method has the advantages of being simple in measurement method and high in size measurement precision.

Description

technical field [0001] The invention relates to the technical field of piston skirt measurement, in particular to a method for measuring the size at the maximum point of the piston skirt by least square ellipse fitting. Background technique [0002] As the heart of the engine, the piston plays a vital role in the overall operation performance of the equipment. The working conditions of the piston are harsh, and the qualified piston size can ensure the precise cooperation between the piston and the cylinder, which is conducive to the formation and maintenance of a dynamic lubricating oil film, thereby reducing engine leakage, reducing frictional resistance, reducing running noise, and improving engine performance. , prolong the service life; if the piston size is unqualified, the lubrication state between the piston and the cylinder will deteriorate, and the wear of the piston and cylinder will be aggravated, which will seriously affect the working performance of the engine. ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/62G06T7/60G06T7/13G06T7/00
CPCG06T7/62G06T7/60G06T7/13G06T7/0004G06T2207/30164
Inventor 陶唐飞杨兴宇徐佳宇赵晋民徐光华
Owner XI AN JIAOTONG UNIV
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