Core wire size non-contact type visual detection device and method for automobile wire harness

Abstract

The invention discloses a core wire size non-contact type visual detection device and a core wire size non-contact type visual detection method for an automobile wire harness, which belong to the field of automotive electronic product detection. The detection object is the size of a core wire of the wire harness after wire harness is subjected to the crimping process. The core wire size non-contact type visual detection device comprises the steps of: step 1, calibrating a camera, correcting image distortion, determining a conversion relationship between a pixel unit and a length unit, calculating calibration parameters, and filtering; step 2, acquiring an offset angle and center coordinates of a minimum circumscribed rectangle of the wire harness, and establishing a detection coordinate system to complete the image spatial transformation; step 3, converting a source RGB spatial image into an HSI space, and determining segmentation threshold values of components H, S and I; step 4, andsegmenting and performing binarization processing on the core wire region, and fitting the minimum circumscribed rectangle of the core wire portion; step 5, and measuring the length and width of the minimum circumscribed rectangle as the core wire size, determining whether the measured value is within a tolerance range, and then determining whether the wire harness is qualified. The detection method of the invention can realize the non-contact type fast, precise and automatic detection of the core wire size of the automobile wire harness.

Description

technical field [0001] The invention belongs to the field of automotive electronic product testing, and relates to a visual testing device and method for automotive electronic products, in particular to a non-contact visual testing device and method for the core wire size of an automotive wiring harness. Background technique [0002] With the gradual increase in automobile sales, the output of automobile wiring harnesses has shown a rapid growth momentum. The automotive wiring harness is the carrier of signal transmission in the automotive circuit. The detection of the core wire size during the crimping process of the wire harness is an important part of the quality inspection of the wire harness. Excessive core wire size will cause serious consequences such as short circuit and open circuit. Traditional core wire size detection usually relies on measuring tools such as micrometers for measurement, and it needs to rely on human eyes to determine the measurement value, which ...

AI Technical Summary

Problems solved by technology

Traditional core wire size detection usually relies on measuring tools such as micrometers for measurement, and it needs to rely on human eyes to determine the measurement value, which results in low detection efficiency and low accuracy

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