In this study we analyzed the potential use of Pseudo-Polar FFT algorithm for image reconstruction of synthetic aperture radiometer, and developed an effective method to improve the image reconstruction accuracy and computational efficiency simultaneously. The advantage of the new algorithm is that it takes pseudo-polar grid instead of Cartesian grid to perform the inverse Fourier transform, an...

Log-polar images have been being used for pattern recognition and active vision tasks for some years. These images are obtained either from true retina-like sensors or from conventional cartesian images by software conversion. From the hardware perspective, the design of such log-polar retinae faces its own technological limitations. In the case of software remappers, however, their very flexib...

An essential research objective in artificial vision are shape &sctipto~ which are invariant for mslation, scale changes and rotations of a bidimensional pattem. k varj-ety of approaches has proved the capacity to characterize

This paper presents a novel algorithm for detecting user-selected objects in given test images based on a new adaptive lifting scheme transform. Given an object as a template, we first select a set of coefficients as object features in the wavelet transform domain and then build an adaptive transform based on the selected features. The goal of the new adaptive transform is to vanish the selecte...

Let T ? B(H) be a bounded linear operator on Hilbert space H, and let = U|T| its polar decomposition. Then, for every [0,1] the ?-Aluthge transform of is defined by ??(T) |T|?U|T|1-?. In this paper, we characterize invertible, binormal, EP operators intersection with special class introduced via transform.

Navigational systems performing real-time tasks involve many image related procedures, such as: acquisition, processing, and information extraction. Various components of these procedures consist of mathematical transformations that can be implemented optically. By using specially designed lenses these transformations can be provided at image acquisition time, and therefore, speed up execution ...

In this paper, the Elzaki transform method is used for solving two-dimensional (2D) elasticity problems in plane polar coordinates. Airy stress function was used to express the stress compatibility equation as a biharmonic equation. Elzaki transform was applied with respect to the radial coordinate to a modified form of the stress compatibility equation, and the biharmonic equation simplified t...

The phase diagrams of polyvinylidene fluoride (PVDF) and its copolymers with chlorotrifluoroethylene (CTFE) are investigated by first-principles calculations. Both PVDF and dilute P(VDF-CTFE) prefer nonpolar structures at zero field, but transform to a polar phase below the breakdown field. The critical field decreases with increasing CTFE content, facilitating the transformation. In disordered...