Today, digital recording of live lectures is a common practice at many universities. This article provides an historical overview of this idea, from the first approaches starting 40 years ago to present-day systems and questions still subject of research. Zusammenfassung Die digitale Aufzeichnung von Vorlesungen ist heute an Hochschulen Alltag. Der Beitrag beschreibt die 40-jährige Entwicklung ...

The space-time Greens functions for 3-D poststack and 3-D prestack migration in a homogeneous medium are derived under the far-field approximation. These Greens functions can be used to practically compute synthetic migrated images. Examples are given for the recording footprint noise associated with a point scatterer and a meandering river channel. The Greens functions also provide fundamental...

The mathematical formulation of calibrating color image reproduction and recording devices is presented. This formulation provides a foundation for future research in areas of characterization of devices and display of color images. The procedure outlined in this paper should become standard for displaying color images for the image processing community.

The mathematical formulation of calibrating color image reproduction and recording devices is presented. This formulation provides a foundation for future research in areas of characterization of devices and display of color images. The importance of calibration is demonstrated by real examples. The procedure outlined in this paper should become standard for displaying color images for the imag...

N, N-dimethyl-4-nitroaniline doping enables red-light holographic recording that was originally insensitive in thick phenanthrenequinone/poly(methyl methacrylate) photopolymer to have reasonable sensitivity. A volume hologram was recorded by a 647 nm laser with maximum diffraction efficiency of about 43% in a 2-mm-thick sample. A Bragg selectivity curve and an image hologram reconstruction are ...

In signal processing, Hilbert transform is used as an analytical tool. Hilbert Transform (HT) is useful in certain kinds of modulation schemes and also for bounded signals. The overall narrow band signals can be easily interpreted in terms of amplitude and frequency modulation. The various applications are present in magnetic recording, filter designing, edge detection and image processing. Key...

Recording devices whether analog or digital, have traits which make them susceptible to noise. In selecting a noise reduction algorithm, one must weigh several factors. Image denoising is defined as a method to recover a true image from an observed noisy image and is applied in display systems to improve the quality of image. One of the popular denoising methods, NLM, produces the quality of im...

Electronic archiving for radiology image management systems requires terabytes of mass storage and large retrieval rates. The use of electronic archiving in a radiology department must be supported by image acquisition nodes, high data rate local area networks, ultrahigh resolution gray-scale display workstations, and hard-copy image recording stations. The requirements for mass storage of radi...

We present a method of recording digital Fourier holograms under incoherent illumination, using a significantly reduced number of observed perspective projections and a digital prediction of the middle projections. The method is demonstrated experimentally. 2007 Optical Society of America OCIS codes: (090.0090) Holography; (090.0090) Digital holography; (090.1760) Computer holography; (100.689...