The distance transform has been proposed for use in computer vision for a number of applications such as matching and skeletonisation. This paper proposes two things: (1) a multi-scale distance transform to overcome the need to choose edge thresholds and scale and (2) the addition of various saliency factors such as edge strength, length and curvature to the basic distance transform to improve ...

We describe a generalised method for ellipsoid fitting against a minimum set of data points. The proposed method is numerically stable and applies to a wide range of ellipsoidal shapes, including highly elongated and arbitrarily oriented ellipsoids. This new method also provides for the retrieval of rotational angle and length of semi-axes of the fitted ellipsoids accurately. We demonstrate the...

The main issues of developing an automatic and reliable scheme for spline-fitting are discussed and addressed in this paper, which are not fully covered in previous papers or algorithms. The proposed method incorporates B-spline active contours, the minimum description length (MDL) principle, and a novel control point insertion strategy based on maximizing the Potential for Energy-Reduction Max...

We studied coherent backscattering (CBS) of light from opal photonic crystals with incomplete band gaps. We observed a dramatic broadening of the CBS cone for incident angles close to the Bragg condition in the crystals. We modify the conventional CBS theory to incorporate Bragg attenuation resulting from the photonic band structure. By fitting the CBS data with the modified theory, we extract ...

The diffusion coefficient of fluorescein in detached cilia of Xenopus laevis olfactory receptor neurons was measured using spatially-resolved FRAP, where the dye along half of the ciliary length was photobleached and its spatiotemporal fluorescence redistribution recorded. Fitting a one-dimensional numerical simulation of diffusion and photobleaching for 35 cilia resulted in a mean value of the...

We accelerate a double precision sparse matrix and DD vector multiplication (DD-SpMV), and its transposition and DD vector multiplication (DD-TSpMV) by using SIMD AVX2 for Krylov subspace methods. We compare some storage formats of DD-SpMV and DDTSpMV for AVX2 to eliminate performance degradation factors in CRS. Our experience indicates that BCRS4x1, with fitting block size to the SIMD register...

David C. Shallcross, University of Melbourne, Melbourne, Victoria 3010, Australia [email protected] Abstract  This paper describes a series of activities for the senior secondary mathematics class room which have been developed to illustrate how mathematics is used by engineers. In one example students are presented with an innovative design for a single storey underground car park. The cl...

karun river with a length of about 890 km is considered as a main river in the country. in this paper, types of karun’s screws regarding to the geometric factors of radius of curvature and chord length were identified by fitting circles with the arcs of the river’s axis. river’s arcs were classified into simple and compound screws. then, by formation of the database consist of topographic...

pediatric traumatic limb amputations are rare and their acute and long term management can be challenging in this subgroup of patients. the lengthy and costly hospital stays, and resulting physical and psychological implications leads to significant morbidity. we present a summary of treatment principles and the evidence base supporting the management options for this entity. the initial manage...

this paper describes a methodology in designing high-performance concrete for simply supported beams, using a hybrid optimization strategy based on a variable neighborhood search threshold acceptance algorithm. three strategies have been applied to discrete optimization of reinforced concrete beams: variable neighborhood descent (vnd), reduced neighborhood search (rns) and basic variable neighb...