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We present numerical and experimental investigations of microstructured fibers with high birefringence and low mode asymmetry. Fibers with approximately equal mode sizes along the two orthogonal axes and birefringence up to 2.7×10−3 were fabricated.
After summarising the conceptual relationship between some old and new techniques for fitting ellipses to data, we conduct a thorough experimental comparison of the discussed methods. The newer techniques promise consistency, unbiasedness, or hyper-accuracy, but our experiments reveal that in practice the performance of these estimators is difficult to distinguish from the performance of established...
In this study, a hardware emulation of HOG and AMDF based scale and rotation invariant robust shape detection for Field Programmable Gate Arrays (FPGA) is described. For this purpose, a robust algorithm with light-computational load has been developed based on features extracted from histogram of oriented gradients (HOG). A normalization scheme is proposed to obtain scale-invariant robust features...
This paper proposes a robust nonlinear controller for a stage control of a vertical scanner in atomic force micro-scope to improve a settling time compared to a conventional PI controller, which results in a faster scanning on a sample surface. The physical model of the whole measurement system with respect to a vertical stage control is mainly described by two linear subsystems and a nonlinear and...
Compassing the spatial shape is used out of developing surround speaker system or signal enhancement. To reconstruct the boundary positions, conventional methods offer an array consists of a large number of elements (e.g. microphones and loudspeakers). This research aims to estimate the correct boundary position using a small number of microphones, by developing a signal processing method which utilizes...
This paper proposes an efficient algorithm to extract all four fingerprints from a slap-image and to identify the indices of these fingers such as index, middle, ring or little finger of left or right hand. Entropy of the image is used to determine different components of fingers, while geometrical and spatial properties of these components are considered to segment fingerprints from the slap image...
By introducing the concept of weights in NURBS curve into a blending technique, the paper extends the representation of the T-Bézier curve. The generalized T-Bézier curve is denoted as a Extension T-Bézier curve, whose shape-control capability is shown to be much better than that of T-Bézier curve. The representation and properties of the extension curve is studied. The curve is easy and intuitive...
The authors propose a universal method to form cylindrically-curved surfaces by dynamically bending in-plane a DRIE-etched flat vertical silicon plate with microactuator. The stiffness is designed position-dependent, thus allowing ideal curvature over large area.
This paper deals with the approximate merging problem of two adjacent DP curves with different degrees by a single curve. We first transform the DP curves into the Bézier curves. Then, we merge Bézier curves. Finally, we transform the Bézier curve back into the DP curve. In the end of this paper, numerical examples are provided to demonstrate the validity and efficiency of our algorithms.
We are developing stimulation coil navigation systems for home use of repetitive transcranial magnetic stimulation (rTMS). rTMS is effective for intractable diseases of the nervous system. However, the effects of rTMS last only for several hours, requiring a continuing daily rTMS therapies in a nearby clinic. A magnetic navigation system, the present system for fulfilling such needs, uses downsized,...
The paper deals with parametrization of shaping compensators (filters) ensuring the Bode's ideal control loop shape for an exactly defined class of process models. The class of essentially monotone fractional-order processes is considered. The fractional integrator is used as the optimal open loop reference model. Several aspects of shaping filter implementation on given frequency band are discussed...
Shape recognition is an important problem in many applications. A simple string matching approach for shape recognition is proposed in this paper. The shapes are coded as their dominant points. The compactness of polygons formed by the centroid and three consecutive dominant points is used as the feature for recognition. The experimental results showed that the proposed method has better recognition...
The binary split grammar is powerful to parse façade in a broad range of types, whose structure is characterized by repetitive patterns with different layouts. We notice that, as far as two labels are concerned, BSG parsing is equivalent to approximating a façade by a matrix with multiple rank-one patterns. Then, we propose an efficient algorithm to decompose an arbitrary matrix into a rank-one matrix...
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...
Despite the ubiquitous use of distance transforms in the shape analysis literature and the popularity of fast marching and fast sweeping methods — essentially Hamilton-Jacobi solvers, there is very little recent work leveraging the Hamilton-Jacobi to Schrödinger connection for representational and computational purposes. In this work, we exploit the linearity of the Schrödinger equation to (i) design...
Recovering a deformable surface's 3D shape from a single view registered to a 3D template requires one to provide additional constraints. A recent approach has been to constrain the surface to deform quasi-isometrically. This is applicable to surfaces of materials such as paper and cloth. Current ‘closed-form’ solutions solve a convex approximation of the original problem whereby the surface's depth...
We propose an energy-based framework for approximating surfaces from a cloud of point measurements corrupted by noise and outliers. Our energy assigns a tangent plane to each (noisy) data point by minimizing the squared distances to the points and the irregularity of the surface implicitly defined by the tangent planes. In order to avoid the well-known ”shrinking” bias associated with first-order...
Luminaires new catalogues highlight permanent changes in their technology and equipment, determining deep implications on the distribution of the emitted luminous flux. Using the index of correlation between the indoor luminaires photometric curves (Philips) and those defined through the functions from the BZ classification, indicates that some of the first category are not included among those from...
In current study, The Mesh free method based on weak-form formulation coupled with the digital imaging technique is developed. This problem consists in computing the deformation of an elastic non-homogenous phantom by Mesh free method and converge the results to the measured deformation by the digital. The effective parameters on the Mesh free results are analyzed and discussed in 2D domain.
Industrial automation tasks typically require a 3D model of the object for robotic manipulation. The ability to reconstruct the 3D model using a sample object is useful when CAD models are not available. For textureless objects, visual hull of the object obtained using silhouette-based reconstruction can avoid expensive 3D scanners for 3D modeling. We propose convex brick (CB), a new 3D primitive...
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