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Morphologic filters are used here to interpolate missing values from sets of frequency domain measurements, as occurs in Magnetic Resonance Imaging. MRI data acquisition is done in the Fourier domain which is often sub-sampled to reduce the required scan time. Partial recovery of the missing frequency samples permits direct Fourier inversion to provide a rapid and improved initial estimation of the...
Morphing is a technique that smoothly transforms a shape onto another. In this paper, we present a method for morphing of two dynamic meshes: mesh sequences representing the keyframes of animated shapes over time. The pipeline of the proposed method comprises two main stages: template-based cross-parameterization and dynamic mesh interpolation. In the cross-parameterization stage, we use a variation...
Telerobotic manipulation allows patients living with upper limb impairments to interact with a variety of environments and accomplish through teleoperation daily activities such as playing, feeding, self-care, and leisure, that would otherwise be difficult to perform. In this paper, we propose a nonlinear mapping between the patient's range of motion and the workspace of an environment being manipulated...
Shapes are the outline of objects, which are expressed by closed curves. Since we usually extract the shape from the binary image, the shapes are a kind of grid-based data in engineering practice. In this paper, we firstly propose a discrete curve model for the grid-based data. Based on this model, the curves are represented by their direction functions in discrete form. Furthermore, we propose stretching...
Current study performs a comparison of the contour inflection point selection methods according to the following criteria: probability of the correct selection, probability of the incorrect selection and an error in the coordinate estimation based on the results of model tasks. Results of the interpolation and differential methods and the method based on wavelet analysis of the contour inflection...
When there is the material that is high absorbency such as metal in the object, X-ray CT image often has artifacts that are abnormal findings. This artifact is called metal artifact. Metal artifact can be obstacle when examining objects accurately. Therefore, it is expected that artifact is reduced by a user of X-ray CT. To reduce metal artifact, various methods have been studied but any methods are...
Constructing a curve that incorporates the intrinsic feature of data is of immense importance in the realms of data visualization, computer graphics and computer aided geometric design. In this paper, most general types of positive data has been envisaged.For this purpose, a piecewise, C1 rational cubic piecewise trigonometric function has been constrained on parameters to retain inherent data shape.
This paper enlightens the ultimate requirement of piecewise cubic functions in graphic designing with having good control on the interpolatory curves and also having flexible tangents. To meet these requirements of graphic designing, a piecewise cubic trigonometric spline function is developed with three shape parameters. These shape parameters provide the flexibility in tangent on each sub interval...
In recent years, deep learning has achieved great success in many computer vision applications. Convolutional neural networks (CNNs) have lately emerged as a major approach to image classification. Most research on CNNs thus far has focused on developing architectures such as the Inception and residual networks. The convolution layer is the core of the CNN, but few studies have addressed the convolution...
Recently, convolutional neural networks (CNN) have been successfully applied to view synthesis problems. However, such CNN-based methods can suffer from lack of texture details, shape distortions, or high computational complexity. In this paper, we propose a novel CNN architecture for view synthesis called Deep View Morphing that does not suffer from these issues. To synthesize a middle view of two...
A new rational quartic interpolating spline based on function values is constructed. The rational quartic interpolating spline curves have simple and explicit representation with parameters. The monotonicity-preserving, C2 continuity and boundedness of rational quartic interpolating spline curves are confirmed. Function value control and derivative value control of rational quartic interpolation spline...
Mobile applications which use location services and maps are one of the most downloaded application by users worldwide. Mobile location services determine latitude and longitude, but not altitude value of a position. In this case, only 2D map applications could be developed. However, many applications could be defined for 3D as vista photographing etc. if the altitude value can determine. In this...
Image segmentation has been and still is a challenge in computer vision. Regardless of the methods used to perform this task, almost always the result is the same: a set of areas representing locations of various items found in the image. If we wish to classify the areas into two types of data, the problem becomes separating foreground from background. Our proposed method starts with this supposition:...
In developmental imaging, 3D+t series of microscopic images allow to follow the organism development at the cell level and have now became the standard way of imaging the development of living organs. Dedicated tools for cell segmentation in 3D images as well as cell lineage calculation from 3D+t sequences have been proposed to analyze these data. For some applications, it may be desirable to interpolate...
The Radial Basis Function (RBF) interpolation is a common technique for scattered data interpolation. We present and test an approach of RBF interpolation on a sphere which uses the spherical distance on the surface of the sphere instead of the Euclidian distance. We show how the interpolation of vector field data depends on the value of shape parameter of RBF and find the optimal shape parameter...
One-shot active stereo using structured light is a practical solution for dynamic scene acquisition. Basically, those methods are based on encoding positional information of the pixel into the single projected pattern. A disadvantage of such methods is decreases of the spatial resolution caused by requiring a certain area of the pattern to encode the positional information. Among those methods, grid-based...
Many text segmentation methods are elaborate and thus are not suitable to real-time implementation on mobile devices. Having an efficient and effective method, robust to noise, blur, or uneven illumination, is interesting due to the increasing number of mobile applications needing text extraction. We propose a hierarchical image representation, based on the morphological Laplace operator, which is...
This paper introduces three interpolation methods that enrich complex evolving region trajectories that are captured every day from numerous ground-based and space-based solar observatories. The interpolation module takes a trajectory as its input and generates an enriched trajectory with interpolated time-geometry pairs. we created three different interpolation techniques that are: MBR-Interpolation...
Finite element method (FEM) must be created the element mesh, it is very tedious and time-consuming. A novel meshless method doesn't require generating the element mesh, it reduces a large amount of computational and human time. The shape parameter plays a key role of meshless methods, the authors usually choose the shape parameter by trial and error or some other ad-hoc means. This study will propose...
Fourier descriptors (FDs) are the widely used shape descriptors. But FDs can only be used to objects with single boundary, and it is inapplicable to objects with several components. In this paper, a region-based method, which is called Polar Vector Fourier Descriptors (PVFDs), is developed to extract invariant features. Firstly, the Cartesian coordinate system is converted into polar coordinate system...
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