Surface Inspection Using Computer Vision and Gradient Spectrum

This paper is concerned with the problem of automatic inspection of hot-rolled plate surface using computer vision. An automated visual inspection system has been developed to take images of external hot-rolled plate surfaces and an intelligent surface defect detection paradigm based on gradient spectrum technique is presented. Gradient spectrum characterizes the spatial configuration of local image texture and is robust against any monotonic transformation of the gray scale. Texture features based on gradient spectrum are extracted from ROI in hot-rolled plate surface images and integrated into a feature vector which uniquely differentiates the abnormal regions from normal surface. Classification accuracies using the gradient spectrum and gradient-based method are compared. The results indicate that gradient spectrum performs well in classifying the samples with the lowest classification error.

Surface Defect Detection Using Texture Features and RBFN

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.44-47.3529 ◽

2010 ◽

Vol 44-47 ◽

pp. 3529-3533

Author(s):

Qiang Song

Keyword(s):

Defect Detection ◽

Surface Defect ◽

Radial Basis Function Network ◽

Texture Features ◽

Rolled Plate ◽

Classification Error ◽

Plate Surface ◽

Normal Surface ◽

Surface Defect Detection ◽

This paper is concerned with the problem of automatic inspection of hot-rolled plate surface using machine vision. An intelligent surface defect detection paradigm based on texture analysis and neural network is presented. Texture features based on GLCM, Laws energy, and LBP are extracted from ROI in hot-rolled plate surface images. These features are integrated into a feature vector which uniquely differentiates the abnormal regions from normal surface. A radial basis function network is used for classification of ROI as normal or abnormal. Classification accuracies using the individual feature sets and the integrated features are compared. The results indicate that the integrated features improve the accuracy of detection. Empirical results show the integrated features from GLCM and LBP perform well in classifying the samples with the lowest classification error.

Automated Visual Inspection of Surface Defects on Hot-Rolled Plate

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.201-203.1619 ◽

2011 ◽

Vol 201-203 ◽

pp. 1619-1622

Author(s):

Qiang Song

Keyword(s):

Visual Inspection ◽

Surface Defects ◽

Digital Camera ◽

Structural Defects ◽

Rolled Plate ◽

Inspection System ◽

Automated Visual Inspection ◽

Accurate Identification ◽

Surface Defect Detection ◽

This paper is concerned with the problem of automatic inspection of hot-rolled plate surface using machine vision. An automated visual inspection (AVI) system has been developed to take images of external hot-rolled plate surfaces and the detailed characteristics of the sensor system which include the illumination and digital camera are described. An intelligent surface defect detection paradigm based on morphology is proposed to detect structural defects on plate surfaces. The proposed method has been implemented and tested on a number of hot-rolled plate surfaces. The results suggest that the method can provide an accurate identification to the defects and can be developed into a commercial visual inspection system.

The production of hot-rolled plate steel with reduced tolerances

Metallurgist ◽

10.1007/bf00836862 ◽

1974 ◽

Vol 18 (11) ◽

pp. 853-854

Author(s):

Yu. V. Konovalov ◽

L. B. Gorskii ◽

A. E. Rudnev ◽

V. P. Samoilov ◽

G. I. Manshilin ◽

...

Keyword(s):

Rolled Plate ◽

Plate Steel ◽

Microstructural Change of Beta Type Titanium Alloy by Intense Plastic Deformation

10.4028/www.scientific.net/msf.503-504.705 ◽

2006 ◽

Vol 503-504 ◽

pp. 705-710 ◽

Cited By ~ 1

Author(s):

Goroh Itoh ◽

Hisashi Hasegawa ◽

Tsing Zhou ◽

Yoshinobu Motohashi ◽

Mitsuo Niinomi

Keyword(s):

Plastic Deformation ◽

Work Hardening ◽

Static Recrystallization ◽

True Strain ◽

Microstructural Change ◽

Intense Plastic Deformation ◽

Rolled Plate ◽

Al Alloy ◽

Hot Rolled ◽

Zr Alloy

Usual static recrystallization treatment and a method to provide intense plastic deformation, ARB namely Accumulative Roll-Bonding, have been applied to two beta type titanium alloys, i.e. Ti-29Nb-13Ta-4.6Zr and Ti-15V-3Cr-3Sn-3Al. Microstructural change as well as work-hardening behavior was examined as a function of plastic strain. Both the work-hardening rate and the hardness at the initial as-hot-rolled state were smaller in the Ti-Nb-Ta-Zr alloy than in the Ti-V-Cr-Sn-Al alloy. Recrystallized grains of 14μm in size were obtained by the usual static recrystallization treatment, which was significantly smaller than that of the starting as-hot-rolled plate of 38μm. No significant change other than flattening and elongating of the original grains was found in the optical microscopic scale. It was revealed, however, from a TEM observation combined with selected area diffraction technique that geometric dynamic recrystallization occurred in the Ti-Nb-Ta-Zr alloy deformed at room temperature by a true strain of 5, resulting in an ultra-fine-grained microstructure where the grain size was roughly estimated to be about 100nm.

Correlation among Microstructure, Texture, and Properties along the Thickness Direction in As-Hot-Rolled and As-Solution-Quenched Al7055 Thick Plates

10.4028/www.scientific.net/msf.1026.65 ◽

2021 ◽

Vol 1026 ◽

pp. 65-73

Author(s):

Kai Zhu ◽

Hong Wei Yan

Keyword(s):

Mechanical Properties ◽

Yield Strength ◽

Tensile Tests ◽

Rolled Plate ◽

Uniaxial Tensile ◽

Thickness Direction ◽

Electron Backscattered Diffraction ◽

Thick Plates ◽

Aluminum Plates ◽

Both microstructure inhomogeneity and mechanical property diversity along the thickness direction in rolled thick aluminum plates have been considered to have a remarkable impact on the performance and properties of the products made from the plates. In this study, scanning electron microscopy (SEM) and electron backscattered diﬀraction (EBSD) characterizations of microstructure and texture types along the thickness directions of Al7055 thick plate specimens prepared using two conditions, hot-rolling and solution-quenching, were performed. To examine the mechanical properties, uniaxial tensile tests were also carried out on specimens machined from both types of thick plates, using a layered strategy along the thickness direction. The results indicate that both the microstructure and mechanical properties are inhomogeneous under the two conditions. Furthermore, it is evident that there is a hereditary relationship between the mechanical properties of the two plates—areas with higher yield strength in the as-hot-rolled plate correspond to areas with the higher yield strength in the as-solution-quenched plate

Application of Quenching-Partitioning-Tempering Process in Hot Rolled Plate Fabrication

10.4028/www.scientific.net/msf.654-656.82 ◽

2010 ◽

Vol 654-656 ◽

pp. 82-85 ◽

Cited By ~ 3

Author(s):

Shu Zhou ◽

Ying Wang ◽

Nai Lu Chen ◽

Yong Hua Rong ◽

Jian Feng Gu

Keyword(s):

Mechanical Properties ◽

Retained Austenite ◽

High Strength Steels ◽

High Strength ◽

Significant Fraction ◽

Rolled Plate ◽

Quenching And Partitioning ◽

Good Ductility ◽

Hot Rolled ◽

Rolled Plates

The quenching-partitioning-tempering (Q-P-T) process, based on the quenching and partitioning (Q&P) treatment, has been proposed for producing high strength steels containing significant fraction of film-like retained austenite and controlled amount of fine martensite laths. In this study, a set of Q-P-T processes for C-Mn-Si-Ni-Nb hot rolled plates are designed and realized. The steels with Q-P-T processes present a combination of high strength and relatively good ductility. The origin of such mechanical properties is revealed by microstructure characterization.

Hot Deformation Behavior of Al-Cu-Li-Mg-Zn-Zr-Sc Alloy in As-Cast and Hot-Rolled Condition

10.4028/www.scientific.net/msf.920.244 ◽

2018 ◽

Vol 920 ◽

pp. 244-249 ◽

Cited By ~ 1

Author(s):

Yaroslav Erisov ◽

Sergey Surudin ◽

Fedor Grechnikov

Keyword(s):

Strain Rate ◽

Hot Deformation ◽

Rheological Model ◽

Physical Simulation ◽

Constant Strain Rate ◽

Rolled Plate ◽

Hollomon Parameter ◽

Aluminum Lithium ◽

Rolled Condition ◽

The results of physical simulation of hot compression of semi-finished products, selected from a cast ingot and hot-rolled plate from aluminum-lithium alloy V-1461, in the temperature range of 400-460°C and strain rates of 1-60 s-1are presented. It is established that at a constant strain rate the flow stresses decrease with increasing test temperature, an increase in the strain rate leads to an increase in flow stresses at a constant temperature. The parameters of the hot deformation rheological model, including the Zener-Hollomon parameter and the hyperbolic sine law, are determined. It is established that the parameters of the rheological model for the cast and hot-rolled state differ insignificantly.