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Discrimination power analysis (DPA) is a statistical analysis combining discrimination concept with discrete cosine transform coefficients (DCTCs) properties. Unfortunately there is not a uniform and effective criterion to optimize the shape and size of premasking window on which the effect of DPA excessively relies. Proper premasking is an auxiliary process to select the feature coefficients that...
The objective of this paper is to propose robust, three-step, and spatiotemporal structured light patterns for rapid 3D shape inspection system. To reduce the negative influence of inspected part texture and ambient light, the patterns are constructed by stripe boundary using monochromatic light. The stripe sequence is generated by the Euler Circuit of graph theory under the proposed constraints in...
The objective of this paper is to propose a robust one shot structured light pattern for real time 3D shape inspection system. To reduce the influence of inspected part reflectance property and ambient light, the pattern is constructed by using monochromatic light. The corner of the chessboard is utilized as the primitive of the pattern since it can provide highly accurate position. Additionally,...
Surface modeling algorithms were designed using models including TC-Be??zier, B spline curve with shape parameter, trigonometric B spline curve with shape parameter and hyperbolic polynomial B spline curve. The SMS (Surface Modeling System) was developed, OpenGL as the graph library, in Microsoft Visual C++ 6.0 programming environment. Founded the uniform platform of surface modeling, and realized...
Skeleton extraction has important application value on object recognition, shape retrieval and feature extraction. Traditional skeleton extraction methods more or less have some flaws. Due to the complexity and diversity of cerebral blood vessels images, the traditional skeleton extraction algorithm can not often get continuous skeletons. This paper presents a new framework to calculate the continuous...
This study investigate the potential biomedical application of micro/nano-aperture membrane fabricated with Polytetrafluoroethylene (PTFE). Experimental work is carried out to examine the membrane's sound transmission/absorption characteristics under the condition of different aperture diameter, thickness and cavity depth of tube. It is discovered that when there is no air layer besides the tested...
The non-contact 3D sensing technology, though achieved many success in a variety of applications, needs an automation system to expand its applications to automotive industries for 3D shape inspection. The reason is the difficulty for an operator to find an optimal solution by the manual control of sensor viewpoints. The problem of this industrial application is the capability for the sensing system...
In this paper, we present a tree-like blood vessels based on the region growing algorithm and level sets method for computing centerlines for both 2D and 3D shape analysis. Consider the tree-like vascular structure, we first use region growing technology to generate the shortest distance from the given root to all the pixels, ground on the distance can detect all the extreme nodes of branches automatically...
Skeleton has very important applications in objects expression, data compression, computer vision and animation. In the discrete space, the basic skeleton algorithms have two categories: one is thinning, the other is based on the distance transformation, in a high-dimensional space generated from the surface to form the ridge to create a skeleton. The skeleton which is based on the distance transform...
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