scholarly journals Construction of Visual Inspection Database for Catenary on High-speed Railways

2017 ◽  
Vol 124 ◽  
pp. 01006
Author(s):  
Yan-guo Wang ◽  
Dapeng Xie ◽  
Haiying Wang ◽  
Xiangdong Li ◽  
Jing Shi ◽  
...  
Keyword(s):  
High Speed ◽  
Visual Inspection

Visual inspection system for trackside communication and signal infrastructure

2020 ◽  
Vol 235 (1) ◽  
pp. 121-130
Author(s):  
Xinyu Du ◽  
Dan Wu
Keyword(s):  
High Speed ◽  
Visual Inspection ◽  
Image Acquisition ◽  
Acquisition System ◽  
Gaussian Kernel ◽  
Inspection System ◽  
Retinex Algorithm ◽  
Railway System ◽  
Image Acquisition System ◽  
Image Details

Trackside communication and signal infrastructure (TCSI) plays an important role in the safe operation of a high-speed railway system. However, it is a challenge to inspect such infrastructure using a vision-based system because of the uneven illumination and various reflection properties of the TCSI surfaces. This paper puts forward a visual inspection system installed on an inspection car for TCSI. The visual inspection system first captures the trackside images using the image acquisition system. Then, an image processing method using a varying-scale Retinex algorithm is implemented so that the visual inspection system can enhance the contrast of these trackside images. The method changes the size of the Gaussian kernel adaptively according to the image details in order to prevent halo artifacts and graying-out effects inherent in many image enhancement algorithms. By comparison with several state of the art methods, varying-scale Retinex is validated to overcome the local inhomogeneous brightness of images and make those images more suitable for browsing and analysis for inspectors. Composed of the image acquisition system and varying-scale Retinex, the visual inspection system is installed on many inspection cars in China for performing visual inspection.

High-Speed VSD Imaging of Visually Evoked Cortical Waves: Decomposition Into Intra- and Intercortical Wave Motions

2002 ◽  
Vol 87 (3) ◽  
pp. 1499-1514 ◽  
Author(s):  
David M. Senseman ◽  
Kay A. Robbins
Keyword(s):  
High Speed ◽  
Visual Inspection ◽  
Wave Motion ◽  
Original Data ◽  
Visual Area ◽  
Relative Advantage ◽  
Data Set ◽  
Complex Wave ◽  
Image Projections ◽  
Cortical Waves

In the pond turtle, Pseudemys scripta elegans, visually evoked cortical waves propagate at different velocities within the primary visual area compared with waves that pass into the secondary visual area. In an effort to separate intra- and intercortical wave motions, movies of visually evoked cortical waves recorded by high-speed voltage-sensitive dye (VSD) imaging were subjected to Karhunen-Loéve (KL) decomposition. This procedure decomposes the VSD movies into a series of basis images that capture different spatial patterns of coherent activity. Most of the energy of the compound wave motion (>95%) was captured by the three largest basis images, M1,1 , M1,2 , and M2,1 . Based on visual comparison with maps of wave front latency, KL basis image M1,2 appears to capture the spread of depolarization within the primary visual area, whereas KL basis image M2,1 appears to capture the spread of depolarization from the primary into the secondary visual area. The contribution of different basis images to the intra- and intercortical wave motions was tested by reconstructing the response using different combinations of KL basis images. Only KL basis images M1,1 and M1,2 were needed to reconstruct intracortical wave motion, while basis images M1,1 and M2,1 were needed to reconstruct intercortical wave motion. It was also found that the direction and speed of wave propagation could be deduced by visual inspection of the basis image projections on to the original data set. The relative advantage of KL decomposition for the analysis of complex wave motions captured by VSD imaging is discussed.

Inspection Time and High-Speed Ball Games

Perception ◽  
1989 ◽  
Vol 18 (6) ◽  
pp. 789-792 ◽  
Author(s):  
Ian J Deary ◽  
Howard Mitchell
Keyword(s):  
Visual Information ◽  
High Speed ◽  
Visual Inspection ◽  
Partial Correlation ◽  
Inspection Time ◽  
Sources Of Information ◽  
Visual Displays ◽  
Fast Speed ◽  
Batting Average ◽  
Age Factor

It has been suggested that successful batsmen in cricket are not distinguished by their fast speed of visual information intake. A study is presented in which a season's batting averages for twenty regular cricketers, all members of the same local team, were correlated with the cricketers' visual inspection times. The correlation was −0.63 ( p < 0.005), suggesting that the successful batsmen were faster at picking up information from briefly presented visual displays. When the age factor was eliminated, the partial correlation between inspection time and batting average remained significant at −0.52 ( p < 0.01). This finding is discussed with respect to the sources of information available from a ball in flight.

CNN computer for high-speed visual inspection

2001 ◽  
Author(s):  
Rodrigo Montufar-Chaveznava ◽  
Domingo Guinea ◽  
Maria C. Garcia-Alegre ◽  
Victor M. Preciado
Keyword(s):  
High Speed ◽  
Visual Inspection

scholarly journals Stabilization of Palygorskite Aqueous Suspensions Using Bio-Based and Synthetic Polyelectrolytes

Polymers ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 129
Author(s):  
Eduardo Ferraz ◽  
Luís Alves ◽  
Pedro Sanguino ◽  
Julio Santarén ◽  
Maria G. Rasteiro ◽  
...  
Keyword(s):  
High Speed ◽  
Visual Inspection ◽  
Colloidal Stability ◽  
The Other ◽  
Morphological Properties ◽  
Ph Values ◽  
Aqueous Suspensions ◽  
Magnetic Stirring ◽  
The Stability ◽  
Physical Treatments

Palygorskite is a natural fibrous clay mineral that can be used in several applications, for which colloidal stability in aqueous suspensions is a key point to improve its performance. In this study, methods of magnetic stirring, high-speed shearing, and ultrasonication, as well as different chemical dispersants, combined with these methods, namely carboxymethylcellulose, alginate, polyphosphate, and polyacrylate, were used to improve the dispersibility and the formation of stable suspensions of palygorskite in different conditions of pH. The stability and particle size of suspensions with a low concentration of palygorskite were evaluated by visual inspection, optical and electron microscopy, dynamic light scattering, and zeta potential measurements. Moreover, the palygorskite used in this work was initially characterized for its mineralogical, chemical, physical, and morphological properties. It was found that more stable suspensions were produced with ultrasonication compared to the other two physical treatments, with magnetic stirring being inefficient in all tested cases, and for higher pH values (pH of 12 and pH of 8, the natural pH of the clay) when compared to lower pH values (pH of 3). Remarkably, combined with ultrasonication, carboxymethylcellulose or in a lesser extent polyphosphate at near neutral pH allowed for the disaggregation of crystal bundles of palygorskite into individualized crystals. These results may be helpful to optimize the performance of palygorskite in several domains where it is applied.

Thermal-Impact Damage of Polyamide and Polyester Yarns

1997 ◽  
Vol 67 (3) ◽  
pp. 211-216
Author(s):  
Cokki Versluis ◽  
Gerard Krooshof ◽  
Fons van Gulick
Keyword(s):  
Melting Point ◽  
Latent Heat ◽  
High Speed ◽  
Visual Inspection ◽  
Impact Damage ◽  
Practical Importance ◽  
Polyamide 6 ◽  
Impact Testing ◽  
Thermal Impact ◽  
Better Than

Thermal impact, that is, the effect of short duration contact between hot objects and polyamide or polyester yarns, is analyzed in relation to the temperature of the hot object and the tension of the yarn. Thermal impact is of practical importance in high speed and heavy duty sewing and in the inflation of uncoated automotive airbags. Yarn damage by thermal impact can be analyzed by visual inspection or by measuring the loss of properties. The melting point and the specific latent heat of the yarn are the main parameters of thermal impact. Polyamide 4,6 yarn performs better than polyamide 6,6, polyester, and polyamide 6 yarns in thermal-impact testing, because it has a higher melting point and a higher specific latent heat.

High-speed processor for realtime visual inspection

1991 ◽  
Vol 15 (1) ◽  
pp. 11-19 ◽  
Author(s):  
JM Edmonds ◽  
ER Davies
Keyword(s):  
High Speed ◽  
Visual Inspection

scholarly journals Conformity of Physical Characteristics of Imported Tires with Government Standards: A Case Study

2004 ◽  
Vol 1 (1) ◽  
pp. 1
Author(s):  
N.T. Ratrout ◽  
S. Anwar Basha ◽  
H. I. Al-Abdul Wahhab ◽  
K. A. Al-Ofi
Keyword(s):  
Tensile Strength ◽  
High Speed ◽  
Visual Inspection ◽  
Performance Tests ◽  
Tensile Strength Test ◽  
Dimension Measurement ◽  
Strength Tests ◽  
Speed Performance ◽  
Almost All

The Saudi Arabian Standards Organization, SASO, has established a set of tests that all passenger car tires have to pass in order to be allowed into the Country. These tests are: visual inspection, dimension measurement, bead unseating, tensile strength and elongation, aging, endurance, and high speed performance tests. This paper describes the application of the first five tests on eight different brands of tires that are taken to represent the categories of “frequently failed” and “infrequently failed” tires in the country. The results showed that the dimensions of almost all the tested tires were somewhat different from those documented in the SASO standards. On the other hand, all the tested tires passed the bead unseating and strength tests. All tires in the “frequently failed” category failed the tensile strength test. In contrast, all tires from the “infrequently failed” category passed this test. The average values of the test for these two tire categories were statistically different at a 95% confidence level.  

High-Resolution Real-Time Visual Inspection System for Micro Assembly

2017 ◽  
Vol 870 ◽  
pp. 249-256
Author(s):  
Bing Yin Zhang ◽  
Mu Zheng Xiao ◽  
Zhi Jing Zhang ◽  
Ting Hai Qin
Keyword(s):  
High Resolution ◽  
Real Time ◽  
High Speed ◽  
Visual Inspection ◽  
Image Sensor ◽  
High Accuracy ◽  
Servo Control ◽  
Inspection System ◽  
Display Device ◽  
Micro Assembly

For precise assembly of miniature parts, the precise inspection for parts’ posture and real-time servo control for assembly greatly depend on the performance of visual inspection system. This paper proposed a high-resolution real-time visual inspection system of micro assembly. The CMOS image sensor and high-speed digital signal processing chip were chosen to design the image acquisition module, image processing module and image display module. High-accuracy display on the common display device was implemented with the video encoding chip and FPGA. The test results showed that the processing speed with preprocessing could reach 3.5 frames per second with 5 mega-pixel resolution, and the display accuracy after threshold processing had little loss. Micro parts assembly experiment and high accuracy Peg-in-Hole assembly experiment are done to test the performance of the proposed visual inspection system. This visual inspection system can be used for high-resolution real-time micro assembly and other real-time visual servo control.

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