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Automobile glass sub-pixel contour extraction method and automobile glass detection method

A technology for automotive glass and contour extraction, applied in image enhancement, image analysis, image data processing, etc., can solve the problems of difficult and objective measurement of detection results, long measurement time, unfavorable automatic production, etc., to achieve high measurement accuracy and improve registration Speed, time-consuming effect

Active Publication Date: 2020-07-14
HUNAN UNIV
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Problems solved by technology

The above measurement methods are all contact measurement methods. Manual detection will get different detection results according to different inspectors. It is difficult to objectively measure the quality of the detection results. The three-coordinate measuring instrument needs to obtain a certain number of points for each measurement. Fitting calculation, so the measurement takes a long time, which is not conducive to the automatic production of the factory

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  • Automobile glass sub-pixel contour extraction method and automobile glass detection method
  • Automobile glass sub-pixel contour extraction method and automobile glass detection method
  • Automobile glass sub-pixel contour extraction method and automobile glass detection method

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Embodiment Construction

[0070] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0071] Such as figure 1 As shown, the automobile glass sub-pixel contour extraction method of the present embodiment comprises the following steps:

[0072] Step 1) obtain the standard automobile glass image and the automobile glass image to be detected;

[0073] Step 2) carry out preprocessing to each automobile glass image, and preprocessing comprises Sigma filtering, median filtering and image enhancement;

[0074] Step 3) edge extraction is carried out to each automobile glass image after preprocessing, obtains the pixel-level edge profile of each automobile glass image;

[0075] Step 4) Perform sub-pixel positioning on the pixel-level edge contours to obtain the sub-pixel edge contours of each automobile glass image.

[0076] In this embodiment, the Sigma filtering process in step 2) is: use an N×N (N=3,5,7,...,) window to slide and fil...

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Abstract

The invention discloses an automobile glass sub-pixel contour extraction method and an automobile glass detection method and device, belongs to the technical field of glass detection, and is used forsolving the problems of large measurement error, long detection time and the like of an existing contact type glass detection method. The adopted scheme is specifically as follows: acquiring a standard automobile glass image and an automobile glass image to be detected; preprocessing each automobile glass image, wherein preprocessing comprises Sigma filtering, median filtering and image enhancement; carrying out edge extraction on each preprocessed automobile glass image to obtain a pixel-level edge contour of each automobile glass image; performing sub-pixel positioning on the pixel-level edge contour to obtain a sub-pixel edge contour of each automobile glass image; registering the obtained standard automobile glass outline and the outline of the automobile glass to be detected; and calculating the error size of the to-be-detected glass. The method and the device have the advantages of high registration precision, high detection efficiency, high detection precision and the like.

Description

technical field [0001] The invention mainly relates to the technical field of automobile glass detection, in particular to a method for extracting the sub-pixel outline of automobile glass, a method and a device for detecting automobile glass based on machine vision. Background technique [0002] In recent years, my country's demand for automobile products has been increasing day by day. In the process of automobile production, automobile glass is one of the important materials. With the continuous development of production technology, the quality requirements of high-end automobile products for automobile glass are also increasing. High, the shape quality and appearance size of auto glass are important indicators to measure whether the production of auto glass is qualified. [0003] In the existing glass production technology, the glass is first formed through the rolling process, and then cut according to the size to obtain the original glass sheet. The shape quality and ap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/30G06T7/13G06T7/00G06T5/00G06T3/40G06T3/00
CPCG06T7/13G06T7/30G06T3/4007G06T7/0004G06T2207/20032G06T2207/20016G06T3/02G06T5/70
Inventor 张小刚陈华姜羽覃椿婷周朗明
Owner HUNAN UNIV
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