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Selective spectral filters in the treatment of visually induced headaches and migraines - A clinical study of 93 patients.

May 2010

Conference: Headache Medicine

Authors:

Márcia Reis Guimarães

Hospital de Olhos Dr. Ricardo Guimarães

Juliana Guimarães

Hospital de Olhos de Minas Gerais

Ricardo Queiroz Guimaraes

UFMG.br - Holhos.com.br

Marina Nogueira

Hospital de Olhos Dr. Ricardo Guimarães

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Síndrome de Meares-Irlen em adolescente: relato de caso / Meares-Irlen syndrome in an adolescent: a case report

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THEORETICAL ANALYSIS OF MICROPHONE ARRAYS WITH POSTFILTERING FOR COHERENT AND INCOHERENT NOISE SUPPR...

January 1970

Microphone arrays have shown substantial capability in re- ducing noise due to their spatial selectivity. In this paper, we first introduce two noise reduction algorithms using mi- crophone arrays to deal with both coherent and incoherent noise components. Two algorithms have the same compo- nents, a generalized sidelobe canceller(GSC) and a Wiener filter, but with different structures. Their ... [Show full abstract] theoretical perfor- mance are then analyzed in different theoretically defined noise fields. The performance is further evaluated by using the real-world multi-channel noise recordings. With regard to the theoretical and experimental results, some discussions on two algorithms are also presented.

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A Post-processing for the reduction of blocking artifact in mobile devices

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Summary In this paper, we propose a post-processing visual enhancement technique to reduce the blocking artifacts in block based DCT decoded image for mobile de- vices that has allocation of the restricted resource. This algorithm uses the adaptive deblocking filter to remove grid noise and ringing noise in monotone areas. To decide whether monotone region or not, we introduce a notion of ... [Show full abstract] Flatness. Also, a new directional filter is utilized to get rid of staircase noise and preserve the origi- nal edge component. The directional filter is applied according to the direction of edge, which is corrected in the process of directional vector smoothing. That is, the image is enhanced through the process of two passes. Experimental results show that the proposed post-processing algorithm produced better results than those of the conventional algorithms both subjective and objective qulitys. The proposed technique is fabricated and verified as a realtime image processing chip in mobile devices.

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Enhancement and presentation of airborne geophysical data

January 1997 · AGSO journal of Australian geology & geophysics

Airborne geophysical data can be enhanced by a range of linear and non-linear filtering algorithms which selectively enhance the anomalies due to one group of geological sources relative to anomalies due to other groups of geological sources. Mathematical enhancement techniques are complemented by a range of imaging routines which can be specified to visually enhance the effects of selected ... [Show full abstract] geological sources.