Method for detecting hub installing hole shape-location parameter based on picture recognition

Abstract

The invention discloses a hub form-position parameter detection method based on image recognition which comprises the following steps: a digital image of a hub with a calibration template is taken, and the distortion correction coefficient of the digital image is obtained; the digital image of the hub is orderly made grey conversion, image compression and image binarization processing; the binarized image is made an area partition based on the connected area lookup to obtain the effective area of each mounting hole of the hub; the effective area of each mounting hole of the hub is made an edge detection to extract the edge information of the mounting hole to locate the boundary of the mounting hole, meanwhile the boundary of the mounting hole is made a geometric distortion correction; random points on the boundary of the mounting hole is made a sub-pixel interpolatory subdivision to obtain the more accurate boundary of the mounting hole; the circle center and the diameter of each mounting hole are fit according to the random points of the boundary of the mounting hole, and a pitch circle parameter of the hub is fit according to the circle center position of each bolt hole. The method of the invention ensures that the efficiency and the accuracy of the hub detection process are greatly improved and also alleviates the labor intensity of the workers.

Description

technical field [0001] The invention relates to a detection method for a vehicle wheel hub, in particular to a detection method for shape and position parameters of a wheel hub installation hole based on image recognition. Background technique [0002] Image recognition is an advanced technology that automatically extracts related information from the image. The basic content includes gray transformation, image segmentation, edge detection, and so on. Image recognition is a key link in developing an intelligent detection system based on input image processing and analysis. [0003] The wheel hub is also called the rim, which is one of the important parts of motor vehicles such as automobiles and motorcycles. As a security device with high requirements, the wheel hub has a lot to do with the driving performance of the vehicle. In the process of driving, in addition to being under pressure, the wheel hub is also undergone irregular stresses such as the interaction of torque ...

AI Technical Summary

Problems solved by technology

Domestic wheel hub factories generally use three-coordinate measuring machines to measure the diameter of hub bolt holes, the distance between adjacent bolt holes and other parameters, but the expensive price of this equipment and the high requirements for operators and the environment make it difficult to popularize

On the other hand, although there are other automated and semi-automatic wheel hub testing instruments with relatively single functions in the domestic market, these instruments are still in the rising stage of the market and have not been popularized, and most of them do not have the ability to automatically process data.

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