imaging

(redirected from NIRI)
Also found in: Dictionary, Thesaurus, Medical, Financial, Acronyms.
Related to NIRI: NIIR, NEERI

imaging

The representation, by means of TV pictures, photographs, graphs, etc., of an object or area by the sensing and recording of patterns of light or other radiation emitted by, reflected from, or transmitted through the object or area. Two broad classifications are chemical imaging, i.e. photography, and electronic imaging. Both are important in astronomy, a variety of photographic emulsions and electronic devices being available for different frequency bands of the electromagnetic spectrum.

The majority of information gathered by ground-based and orbiting telescopes is in digital form so that it can be manipulated by computer. This information can be derived directly from electronic devices, such as CCDs, photon-counting detectors, or photovoltaic detectors, associated with the telescope. These devices respond to radiation by converting it to an electrical signal. They are more sensitive than photographic emulsions, responding to lower levels of intensity and/or producing an image in a shorter time. Photographic plates do, however, provide an image of a much greater area of the sky than existing electronic devices. Machines, such as COSMOS, have therefore been built to measure data on photographic plates rapidly and automatically and produce results in digital form.

An electronic detector can be moved across the focused image of an astronomical object or area of the sky, or the image can be moved across the detector. The electrical signal from the detector is sampled in such a way that an array of values corresponding to an array of portions of the complete image is obtained. Alternatively the image falls on a large number of closely packed detectors, all producing a signal. In each case the result is a set of numbers corresponding to some property of the individual image portions, e.g. the intensity at a particular wavelength. The individual portions into which the image is divided are called pixels (short for picture elements). The greater the number of pixels per image, the higher the resolution, i.e. the greater the detail seen.

This numerical version of the image will normally reside in a computer system, and can be manipulated in different ways in order to highlight different aspects of the original image; the manipulative techniques are known as image processing. The final form of the display can be a TV monitor, a visual display unit attached to a computer, a plotting device, or photographic film, and information derived from the image can also appear in graphs and tables, and be subjected to statistical and numerical analysis.

imaging

[′im·i·jiŋ]
(physics)
The formation of images of objects.

imaging

(graphics)
The production of graphic images, either from a video camera or from digitally generated data (see visualisation), or the recording of such images on microfilm, videotape or laser disk.

See also scanner.

imaging

(1) Creating a film or electronic image of any picture or paper form. It is accomplished by scanning or photographing an object and turning it into a matrix of dots (bitmap), the meaning of which is unknown to the computer, only to the human viewer. Scanned images of text may be encoded into computer data (ASCII or EBCDIC) with page recognition software (OCR). See micrographics, image processing and document imaging.

(2) The illusion of a live performance in audio playback. Microphone placement during recording, post-recording mixing in the studio and the performance of the speakers when listening all contribute to the quality of the imaging. Geared to the type of venue such as a concert hall or nightclub, surround sound processing in the audio equipment creates or enhances effects that attempt to make imaging more realistic.

Speaker Imaging
From the playback side, imaging quality is derived mostly from the speakers. The stiffness and mass of the speaker cone, along with the materials used to suspend the cone in its frame, are the primary criteria that affect the speaker's capability of reproducing sound accurately, and thus the imaging. See surround sound and audiophile.
References in periodicals archive ?
Geralyn Maher DeBusk, President of HIR, stated, "In addition to her NIRI involvement, Hala has been a tremendous asset to our firm over the years.
NIRI will now begin a nationwide search for a new CEO, and has formed a search committee to identify and evaluate candidates.
For more information, please visit NIRI San Diego's newly designed website at www.
NIRI Fellows are nominated by their peers, and represent the highest standards in the investor relations profession and in our community,” said Jeffrey D.
Anne has been very involved in a variety of NIRI programs.
REGISTRATION & FEES By May 21 // $45 for NIRI San Diego members / $60 for non-members Day of event // $50 for NIRI San Diego members / $65 for non-members / $20 for students
About the National Investor Relations Institute (NIRI) Founded in 1969, NIRI is the professional association of corporate officers and investor relations consultants responsible for communication among corporate management, shareholders, securities analysts and other financial community constituents.
NIRI-Chicago is one of the largest NIRI chapters in the United States and has been the recipient of several NIRI awards for large chapters over the years, including being recognized as Best Overall Large Chapter in 2012.
2012 NIRI Annual Conference On-Site Research Sponsor and Managing Director of Corbin Perception Group, Rebecca Corbin said, "We are honored to sponsor NIRI's survey, which underscores the importance of targeting as a core component of a best-in-class IR program.
said, "The networking and professional development at every NIRI chapter is such an important part of the overall NIRI member experience.
These Standards were approved by the NIRI Board of Directors, and were made possible by the time, energy and expertise of thought leaders in the investor relations and legal communities.