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Point cloud is one of the primitive representations of 3D data nowadays. Despite that much work has been done in 2D image matching, matching 3D points achieved from different perspective or at different time remains to be a challenging problem. This paper proposes a 3D local descriptor based on 3D self-similarities. We not only extend the concept of 2D self-similarity [1] to the 3D space, but also...
Denoising surfaces is a a crucial step in the surface processing pipeline. This is even more challenging when no underlying structure of the surface is known, id est when the surface is represented as a set of unorganized points. In this paper, a denoising method based on local similarities is introduced. The contributions are threefold: first, we do not denoise directly the point positions but use...
Ahichhatra, is 20 km from Bareilly district, Uttar Pradesh, one of the most ancient settlements in India. It encompasses differential accumulation of cultural and structural deposits beginning from 2500BC–1200AD. Ground Penetrating Radar (GPR) survey, involving both 2D & 3D profiling, helped in finding the buried structures at the site and also in understanding the pattern of occupancy. GPR and...
The Korean traditional house is famous for its beauty and healthful aspects. However, its construction cost is too high because of the manual process of parts such as rafter, timber, etc. These days, many people want to build a modernized Korean traditional house at a low cost. In order to do so, the rafter machining process is required to be automatized using a CNC machine. It is also observed that,...
The paper shows several methods employed in a semi-automatic pipeline for 3D surface reconstruction of anatomic shapes from Computed Tomography scans. Main benefits of the approach are very little human involvement and high processing speed, while maintaining high reconstruction accuracy. Several filtering methods are described that make contour segmentation easier. Further improvements of the algorithm...
In the area of 3D shape analysis, research in mesh segmentation has always been an important topic, as it is a fundamental low-level task which can be utilized in many applications including computer-aided design, computer animation, biomedical applications and many other fields. We define the automatic robust mesh segmentation (ARMS) method in this paper, which 1) is invariant to isometric transformation,...
In this work, we present intrinsic shape context (ISC) descriptors for 3D shapes. We generalize to surfaces the polar sampling of the image domain used in shape contexts: for this purpose, we chart the surface by shooting geodesic outwards from the point being analyzed; ‘angle’ is treated as tantamount to geodesic shooting direction, and radius as geodesic distance. To deal with orientation ambiguity,...
Cu-Cu bonding is seen as possible option to enable 3D-IC integration within a reasonable cost. In case of 3D stacking, the TSVs can be revealed (nails) at wafer back side and bonded directly on a Cu landing pad. This can offer small pitch IOs and save the cost of extra processing like RDL (Re-Distribution Layer) and bumping.
Understanding the mechanisms involved in cell deformation and motility is of major interest in numerous areas of life sciences. Precise quantification of cell shape requires robust shape description tools to be amenable to subsequent analysis and classification. The main difficulty lies in the great variability of cell shapes within so-called ”homogeneous” populations. While basic shape descriptors...
The high performance application processors found in today's hand held wireless and mobile computing products, such as smart phones and tablet computers, require packages that can support demanding device performance and dense form factor requirements. The package architecture must enable the required signal routing, signal integrity, power delivery, physical form factor, manufacturability and cost...
Miniaturization of electronic components driven by “thin and light” products in portable and consumer electronics has lead to thinner and smaller Ball Grid Array (BGA) packages. Surface Mount (SMT) processes for these smaller and thinner packages present significant challenges, and the reduced Z-height requirements were met with improved process solutions. This study is focused on two technology options:...
Light collection in scintillators ZnSe(X), where X is an isovalent dopant, were studied using Monte Carlo calculations. Optimum design was determined for detectors of "scintillator - Si-photodiode" type, which can involve either one scintillation element or scintillation layers of large area made of small-crystalline grains. The calculations were carried out both for determination of the...
In photometric stereo inter-reflections inside the object may blur the images in shade, resulting in blurred shapes. They may occur in the concave surface parts while they may not in the convex parts, and as the curvature of the concavity increases, the effects may be more serious. In this paper, we introduce an image filtering function in the process of shape reconstruction from color images, to...
This paper presents the practical implementation of a novel shape measurement and analysis scheme for automatic quality inspection of sheet metal parts with large and complicated curved surfaces used widely for manufacturing applications base on statistics. In the proposed technique, the online measurement system (OLMS) developed with improved accuracy, flexibility and advanced measuring efficiency...
The need for mapping small objects in such areas as museum collections may be met by using laser scanning techniques which are likely the best and the most reliable. However, the costs associated with these techniques prohibit their use apart from that such objects are too fragile for repeated handling. Therefore, the alternative is the use of passive methods like stereovision. In this paper we presents...
To accelerate the processing for the integration, registration, representation and recognition of point clouds, it is of growing necessity to simplify the surface of 3-D models. Simplification is an approach to vary the levels of visual details as appropriate, thereby improving on the overall performance of applications. This paper proposes a saliency detection based points sampling method for mesh...
In this present work, we propose to define a novel surface registration approach using the generalized Hausdorff distance in the shape space. It is based on the selection of local and invariant points under the transformations of the 3D motion group. These points are selected from two level sets extracted from geodesic local coordinates with respect to a given reference. The optimal number of invariant...
We present a system for free-form surface modeling and editing that allows a user to create a surface and modify a shape by shaded image using stroke-based drawing tools. After user input sketch contours, smooth distance fields are computed, then translated into height fields. A closed smooth surface is created by the contours and the inferred height fields. Further, user can editing surface by sketched...
In this paper a polarisation model which predicts surface reflection as a function of refractive index and angle of incidence is introduced. We present the underlying physics of polarisation which is based on the Fresnel theory and Malus' law. The proposed model can be used to recover the shape of the objects for images taken under polarised light. The traditional way of shape recovery using diffuse...
In this paper we propose a method for temporal interpolation of a point cloud undergoing occlusions and topological changes. The point cloud is first merged into fine clusters, which are then further merged into coarse clusters for each source and target shape. In conjunction with trash box bins to cope with occlusions, a coarse correspondence between a source and a target shape is found that minimizes...
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