Visual Enhancements (visual + enhancement)

Distribution by Scientific Domains


Selected Abstracts


STEREOVISION FOR VISUAL ENHANCEMENT IN MODAL ANALYSIS

EXPERIMENTAL TECHNIQUES, Issue 4 2002
S.-E. Chen
First page of article [source]


Risk news in the world of Internet newsgroups

JOURNAL OF SOCIOLINGUISTICS, Issue 1 2001
Kay Richardson
The coming of the Internet has provided those who are able to benefit from it new ways of giving and seeking information. These new contexts of communication include newsgroups, very much a text-based form of interaction with little visual enhancement. In the new era of ,risk society' (Beck 1992) people make use of newsgroups to talk about the risks which now confront the world, in their pursuit of trustworthy information and informants. Using the affair of Mad Cow Disease (BSE), with particular reference to the crisis in 1996, this article explores the dynamics of news exchange via the newsgroups as a process which is Interactive, International, Interested and Intertextual. These characteristics result in a form of discourse through which participants engage in the interpersonal social construction of risk. The credibility of the proposition that BSE poses a health risk to humans is the focus of their discussions: they are concerned with the nature of the evidence for that proposition and with the reliability of the sources responsible for endorsing it. [source]


The Effect of Frequency of Input-Enhancements on Word Learning and Text Comprehension

LANGUAGE LEARNING, Issue 2 2007
Susanne Rott
Research on second language lexical development during reading has found positive effects for word frequency, the provision of glosses, and elaborative word processing. However, findings have been inconclusive regarding the effect of such intervention tasks on long-term retention. Likewise, few studies have looked at the cumulative effect of interventions on word learning or text comprehension. This investigation sought to assess the effect of increased frequency of target words (TWs) comparing lexical gain of words that occurred once (F1) or four times (F4) in the input passage. The study further investigated the combined effect of frequency (F4) and semantic or visual enhancements. It compared the following reading conditions: (a) TWs were glossed four times in the text (four-gloss: 4G); (b) TWs were first glossed, then retrieved in the first language, and bolded twice (gloss-retrieval: GR); and (c) TWs were first glossed and then bolded three times (gloss-bolding: GB). In addition, the study assessed the effect of these interventions on long-term retention (4,6 weeks) of lexical knowledge and on text comprehension. Findings revealed that the GR and 4G reading conditions resulted in more productive word gain than the GB condition or when readers encountered a TW only once. Repeated visual enhancements seemed to have no effect on strengthening word encoding. The comprehension of main ideas was highest when the TW was glossed four times followed by the gloss-bolding reading condition and the gloss-retrieval task. [source]


Enhanced visualization of histological samples with an adjustable RGB contrast system with application for tissue used in photodynamic therapy

MICROSCOPY RESEARCH AND TECHNIQUE, Issue 6 2008
Wilma Regina Barrionuevo
Abstract The analysis of histological sections has long been a valuable tool in the pathological studies. The interpretation of tissue conditions, however, relies directly on visual evaluation of tissue slides, which may be difficult to interpret because of poor contrast or poor color differentiation. The Chromatic Contrast Visualization System (CCV) combines an optical microscope with electronically controlled light-emitting diodes (LEDs) in order to generate adjustable intensities of RGB channels for sample illumination. While most image enhancement techniques rely on software post-processing of an image acquired under standard illumination conditions, CCV produces real-time variations in the color composition of the light source itself. The possibility of covering the entire RGB chromatic range, combined with the optical properties of the different tissues, allows for a substantial enhancement in image details. Traditional image acquisition methods do not exploit these visual enhancements which results in poorer visual distinction among tissue structures. Photodynamic therapy (PDT) procedures are of increasing interest in the treatment of several forms of cancer. This study uses histological slides of rat liver samples that were induced to necrosis after being exposed to PDT. Results show that visualization of tissue structures could be improved by changing colors and intensities of the microscope light source. PDT-necrosed tissue samples are better differentiated when illuminated with different color wavelengths, leading to an improved differentiation of cells in the necrosis area. Due to the potential benefits it can bring to interpretation and diagnosis, further research in this field could make CCV an attractive technique for medical applications. Microsc. Res. Tech., 2008. © 2008 Wiley-Liss, Inc. [source]