Nearly all of MR-imaging in use today is based on a k-space approach making use of the fact, that a linear spatial encoding field – i.e. a gradient – leads to a linear variation of the Larmor frequency of spins. Localization is then achieved by Fourier transformation of the acquired time domain signal into the frequency domain, which directly corresponds to the spatial domain. Consequently two-...

Infrared images provide useful information to inspect the status of combustion processes. The flame geometry and intensity depend on the process variables and the characteristics of the combustion chamber. This paper describes methods to analyze infrared images of industrial flames and to characterize the flame geometry. A segmentation algorithm is proposed to separate the flame region from the...

We study the focusing properties of a two dimensional complex square-lattice photonic crystal (PC) comprising air holes immersed in Ge medium. The finite difference time domain (FDTD) method is utilized to calculate the dispersion band diagram and to simulate the image formation incorporating the perfectly matched layer (PML) boundary condition. In contrast to the common square PCs with the sam...

Image formation is quantised by imposing an image induced connection and computing the associated torsion and curvature in terms of diierential or integral invariants. Imposing invariance of the image formation under the classical group of movements slot-machines reading out the torsion and the curvature are shown to locate endpoints and other type of interesting topological objects. Requiring ...

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Imaging in a fundus camera depends more on design of the system than on correction of the first fundus image as formed by the ophthalmoscopic lens. We show here that the designer may use the free parameters of the ophthalmoscopic lens (contact or noncontact) to correct the latter for observation and illumination of the fundus. In both contact and noncontact systems the fundus is illuminated by ...

In spite of over two decades of intense research, illumination and pose invariance remain prohibitively challenging aspects of face recognition for most practical applications. The objective of this work is to recognize faces using video sequences both for training and recognition input, in a realistic, unconstrained setup in which lighting, pose and user motion pattern have a wide variability ...

This paper presents an integrated endoscope-compatible Fibered Confocal Fluorescence Microscope (FCFM) for medical imaging, the F400. In situ high resolution images can be obtained thanks to a set of flexible miniaturized optical probes of 0.5 to 1.5 mm diameter that can be inserted through the working channel of an endoscope. We briefly present in this paper the FCFM system, with a particular ...