Light source optimization for automatic visual inspection of piston surface defects

Xu, Lifei; Yang, Zeng-Quan; Jiang, Zhenhua; Chen, Y.

doi:10.1007/s00170-016-9937-x

Cited by 27 publications

(12 citation statements)

References 29 publications

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“…Concurrently, a deeper understanding of the optical properties of target materials, such as concrete blocks and polymer resins, is essential for developing a broadband spectral database that potentially facilitates well-substantiated and highly reliable sensing system operation. Unlike the surfaces of defective samples, which mainly require visible light inspections 62 , 63 , the non-destructive photo-monitoring methods of inner defects (i.e. internal breakages, chloride and liquid impurities and corrosion) are still controversial.…”

Section: Discussionmentioning

confidence: 99%

Robot-assisted, source-camera-coupled multi-view broadband imagers for ubiquitous sensing platform

Yuasa

Utaki

et al. 2021

Nat Commun

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Multi-functional photo-imaging garners attention towards the development of universal safety-net sensor networks. Although there are urgent needs to comprehensively address the optical information from arbitrarily structured and located targets, investigations on multi-view sensitive broadband monitoring, being independent of the operating environment, are yet to be completed. This study presents a robot-assisted, photo-source and imager implanted, multi-view stereoscopic sensitive broadband photo-monitoring platform with reflective and transmissive switchable modes. A multifaceted photo-thermoelectric device design based on flexible carbon nanotube films facilitates the prototype demonstrations of non-destructive, target-structure-independent, free-form multi-view examinations on actual three-dimensional industrial components. Further functionalisation, namely, a portable system utilising three-dimensional printing and ultraviolet processing, achieves the unification of freely attachable photo-imagers and miniature photo-sources, enabling location-independent operation. Consequently, the non-destructive unmanned, remote, high-speed, omni-directional testing of a defective aerial miniature model winding road-bridge with a robot-assisted photo-source imager built into a multi-axis movable photo-thermoelectric monitor arm is demonstrated.

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Section: Discussionmentioning

confidence: 99%

Robot-assisted, source-camera-coupled multi-view broadband imagers for ubiquitous sensing platform

Yuasa

Utaki

et al. 2021

Nat Commun

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“…In (16) For the uncertainty V of the flange-end visual measurement device in the measuring of the semi-finished crankshaft, the actual flange-end surface is not exactly coincident with the plane of the checkerboard while calibrating sub-camera. And the illumination, the chamfer of threaded holes, and the reflected light from the flange-end surface, etc., all of which will affect the uncertainty of the flange-end holes relative position measurement [25].…”

Section: The Uncertainty Analysis Of the Relative Position Measurmentioning

confidence: 99%

The Fast Measurement for the Relative Position of Flange-End Holes

Wang

Sun

2019

IEEE Access

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For the flange end of the internal combustion engine crankshaft, the position of threaded holes and pinhole relative to the journal reference plane affects the dynamic balance and thermal efficiency of the engine, and therefore, this parameter measurement has a positive significance in the crankshaft manufacture. This paper proposes a system for quickly measuring the relative position of the flange-end holes, which uses a pneumatic linear variable differential transformer to form measuring benches for getting the position of the journal reference plane, and the high precision coordinates of the flange-end holes are obtained by multicamera. The coordinates of the flange-end holes are merged into the global coordinate system of the journal reference plane, and the experimental result shows that the position uncertainty is better than 0.1 mm. This method has the advantage of convenient loading and unloading, fast measuring speed, and high accuracy and is easily implemented in the flexible manufacturing line for a full inspection of the semi-finished crankshaft. INDEX TERMS Crankshaft, flange-end holes, pLVDT, multi-camera.

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“…Roberto [12] using a novel strategy for feature extraction from Gabor filters combined with three different classification techniques to preprocess, segment, and classify the acquired images. Xu [13] proposed a method based on polarized light-filtering and optimized the structure parameters of the lighting system. The method was more effective compared with conventional piston surface defects defection methods.…”

Section: Introductionmentioning

confidence: 99%

Surface Defects Detection of Stamping and Grinding Flat Parts Based on Machine Vision

Tian

Wang

Lin

et al. 2020

Sensors

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Currently, surface defect detection of stamping grinding flat parts is mainly undertaken through observation by the naked eye. In order to improve the automatic degree of surface defects detection in stamping grinding flat parts, a real-time detection system based on machine vision is designed. Under plane illumination mode, the whole region of the parts is clear and the outline is obvious, but the tiny defects are difficult to find; Under multi-angle illumination mode, the tiny defects of the parts can be highlighted. In view of the above situation, a lighting method combining plane illumination mode with multi-angle illumination mode is designed, and five kinds of defects are automatically detected by different detection methods. Firstly, the parts are located and segmented according to the plane light source image, and the defects are detected according to the gray anomaly. Secondly, according to the surface of the parts reflective characteristics, the influence of the reflection on the image is minimized by adjusting the exposure time of the camera, and the position and direction of the edge line of the gray anomaly region of the multi-angle light source image are used to determine whether the anomaly region is a defect. The experimental results demonstrate that the system has a high detection success rate, which can meet the real-time detection rEquation uirements of a factory.

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Light source optimization for automatic visual inspection of piston surface defects

Cited by 27 publications

References 29 publications

Robot-assisted, source-camera-coupled multi-view broadband imagers for ubiquitous sensing platform

Robot-assisted, source-camera-coupled multi-view broadband imagers for ubiquitous sensing platform

The Fast Measurement for the Relative Position of Flange-End Holes

Surface Defects Detection of Stamping and Grinding Flat Parts Based on Machine Vision

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