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Performing reliable target detection in reverberation background is a critical problem demanding prompt solutions. Researching on the statistical characterization of reverberation envelope is significantly important for not only the CFAR detection, but also the environment detection and seafloor classification. Identified as a robust statistical model for shallow water reverberation envelope, K-distribution,...
Bezigons, i.e., closed paths composed of Bézier curves, have been widely employed to describe shapes in image vectorization results. However, most existing vectorization techniques infer the bezigons by simply approximating an intermediate vector representation (such as polygons). Consequently, the resultant bezigons are sometimes imperfect due to accumulated errors, fitting ambiguities, and a lack...
Understand the tomography system as a temporal microscopy by space-time duality, a simple adjustment was performed on a conventional swept-source optical coherence tomography (SS-OCT), and achieved sharper resolution (∼4 μm) for the single layer measurement.
APETALA2 (AP2) gene encodes a floral homeotic gene, is involved in the specification of floral organ identity, establishment of floral meristem identity, development of the ovule and seed coat, and controlling seed mass. Here we reported that an amino acid mutation of AP2 effect on the petal identify, also cause leaf shape change and early anthesis.
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,...
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 introduce a new point cloud registration strategy for 3D surface inspection, named object-oriented method. Traditionally, the registration methods use a fitting based algorithm, which is a recursive process and too time consuming to do quality inspection. Moreover, the fitting based algorithms require that the measured data and the CAD model have same shapes. Photogrammetry and ICP-based...
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