scholarly journals Free-form anisotropy: A new method for crack detection on pavement surface images

2011 ◽  
Author(s):  
Tien Sy Nguyen ◽  
Stephane Begot ◽  
Florent Duculty ◽  
Manuel Avila
Keyword(s):  
Crack Detection ◽  
New Method ◽  
Free Form ◽  
Pavement Surface ◽  
Surface Images

scholarly journals Automatic Segmentation and Enhancement of Pavement Cracks Based on 3D Pavement Images

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Baoxian Li ◽  
Kelvin C. P. Wang ◽  
Allen Zhang ◽  
Yue Fei ◽  
Giuseppe Sollazzo
Keyword(s):  
High Performance ◽  
Crack Detection ◽  
Matched Filter ◽  
Automatic Segmentation ◽  
Tensor Voting ◽  
Pavement Condition ◽  
Detection Algorithms ◽  
Pavement Surface ◽  
Saliency Maps ◽  
Inspection Systems

Pavement cracking is a significant symptom of pavement deterioration and deficiency. Conventional manual inspections of road condition are gradually replaced by novel automated inspection systems. As a result, a great amount of pavement surface information is digitized by these systems with a high resolution. With pavement surface data, pavement cracks can be detected using crack detection algorithms. In this paper, a fully automated algorithm for segmenting and enhancing pavement crack is proposed, which consists of four major procedures. First, a preprocessing procedure is employed to remove spurious noise and rectify the original 3D pavement data. Second, crack saliency maps are segmented from 3D pavement data using steerable matched filter bank. Third, 2D tensor voting is applied to crack saliency maps to achieve better curve continuity of crack structure and higher accuracy. Finally, postprocessing procedures are used to remove redundant noises. The proposed procedures were evaluated over 200 asphalt pavement images with diverse cracks. The experimental results demonstrated that the proposed method showed a high performance and could achieve average precision of 88.38%, recall of 93.15%, and F-measure of 90.68%, respectively. Accordingly, the proposed approach can be helpful in automated pavement condition assessment.

New methods for projecting a 3D object onto a free-form surface

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Jingyu Pei ◽  
Xiaoping Wang ◽  
Leen Zhang ◽  
Yu Zhou ◽  
Jinyuan Qian
Keyword(s):  
Approximate Solution ◽  
New Method ◽  
Free Form ◽  
Parallel Projection ◽  
Content Type ◽  
3D Object ◽  
New Methods ◽  
Free Form Surface ◽  
Newton Raphson ◽  
Raphson Iteration

Purpose This paper aims to provide a series of new methods for projecting a three-dimensional (3D) object onto a free-form surface. The projection algorithms presented can be divided into three types, namely, orthogonal, perspective and parallel projection. Design/methodology/approach For parametric surfaces, the computing strategy of the algorithm is to obtain an approximate solution by using a geometric algorithm, then improve the accuracy of the approximate solution using the Newton–Raphson iteration. For perspective projection and parallel projection on an implicit surface, the strategy replaces Newton–Raphson iteration by multi-segment tracing. The implementation takes two mesh objects as an example of calculating an image projected onto parametric and implicit surfaces. Moreover, a comparison is made for orthogonal projections with Hu’s and Liu’s methods. Findings The results show that the new method can solve the 3D objects projection problem in an effective manner. For orthogonal projection, the time taken by the new method is substantially less than that required for Hu’s method. The new method is also more accurate and faster than Liu’s approach, particularly when the 3D object has a large number of points. Originality/value The algorithms presented in this paper can be applied in many industrial applications such as computer aided design, computer graphics and computer vision.

The Study on the Linking-Up of Free-Form Surface Fiber Placement Track Based on Mesh Creating

2008 ◽  
Vol 392-394 ◽  
pp. 682-687 ◽  
Author(s):  
Zhong Xi Shao ◽  
Hong Ya Fu ◽  
De Cai Li
Keyword(s):  
Projective Plane ◽  
Calculation Method ◽  
New Method ◽  
Free Form ◽  
Parallel Projection ◽  
Reference Vector ◽  
Fiber Placement ◽  
Vertex Point ◽  
Free Form Surface ◽  
Pass Through

When using meshing creating method of FP (fiber placement) track, once the track point falls at some vertex point of mesh element, in the meantime the vertex point happens to be shared by several mesh elements, there needs a reasonable calculation method to select next mesh element which the FP track will pass through. Then it comes to the problem on linking of FP tracks. In order to solve it, in this paper, the author puts forward a new method, in which parallel projection theory is used, project need analytical mesh element and FP reference vector to a sound projective plane, on which the mesh element be selected and the FP track be calculated, then the FP track would be projected back to the placement surface. Program using this method realized a reasonable joint at the shared vertex point of meshing elements, which the FP direction has little change, and the mutation of track doesn’t come forth. So, the correctness of the method, which putted forward in this paper, is proved.

Singularity analysis of pavement surface images

2007 ◽  
Author(s):  
Gang Wang ◽  
An-zhi He ◽  
Liang Xiao
Keyword(s):  
Singularity Analysis ◽  
Pavement Surface ◽  
Surface Images

scholarly journals A new method for choosing between ball-end cutter and toroidal cutter when machining free-form surfaces

2020 ◽  
Vol 111 (5-6) ◽  
pp. 1425-1443
Author(s):  
Mahfoud Herraz ◽  
Jean-Max Redonnet ◽  
Marcel Mongeau ◽  
Mohammed Sbihi
Keyword(s):  
New Method ◽  
Free Form ◽  
Free Form Surfaces ◽  
Toroidal Cutter

scholarly journals A New Method for Evaluating Pavement Surface Using Fuzzy Sets Theory.

1996 ◽  
pp. 207-213 ◽  
Author(s):  
Kenji Himeno ◽  
Tsuyoshi Kamijima ◽  
Yoshitaka Hachiya
Keyword(s):  
Fuzzy Sets ◽  
New Method ◽  
Fuzzy Sets Theory ◽  
Pavement Surface ◽  
Sets Theory

Nonlinear Interaction of Acoustical Waves Due to Cracks and Its Possible Usage for Cracks Detection

1995 ◽  
Vol 1 (3) ◽  
pp. 335-344 ◽  
Author(s):  
V. Yu. Zaitsev ◽  
A.M. Sutin ◽  
I. Yu. Belyaeva ◽  
V.E. Nazarov
Keyword(s):  
Acoustic Wave ◽  
Nonlinear Interaction ◽  
Crack Detection ◽  
Wave Amplitude ◽  
Acoustic Pulse ◽  
Transmitted Wave ◽  
New Method ◽  
Nonlinear Properties ◽  
Reflected Wave ◽  
Crack Type

An interaction of a CW acoustic wave and a powerful acoustic pulse due to nonlinear properties of a crack-type discontinuity in a solid is considered. Characteristics of nonstationary variations of the reflected wave amplitude and the phase of the transmitted wave, which are induced by the powerful pulse, are determined. The effects should allow one to distinguish cracks from other scatterers and can be used as a base of a new method of crack detection and positioning. Demonstrative signal estimates based on two simplified crack models are presented.

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