Results 241 to 250 of about 870,231 (290)

Increment Threshold and Dark Adaptation*

Journal of the Optical Society of America, 1963
The increment threshold ΔI as a function of the background field I is independent of the amount of bleaching in rods and cones; the value of ΔI for rods depends upon the activity of their neighbors. The absorption of one quantum always elicits a rod signal, but its effectiveness depends upon the threshold for signals in the summation pool.In dark ...
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An adaptable threshold detector

Information Sciences, 2011
A data set often comprises some data classes. For example, a gray-scale image may consist of some objects, each of which has similar pixels' gray-scales. The threshold obtained by Otsu's thresholding method (OTM) is biased towards certain data class with larger variance or larger number of data when the variances or the numbers of data among classes ...
Pei-Yan Pai, Chin-Chen Chang, Yung-Kuan Chan, Meng-Hsiun Tsai   +3 more
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Threshold adaptation in normal listeners

The Journal of the Acoustical Society of America, 1973
Threshold adaptation for 500, 1000, 2000, and 4000 Hz was studied with the Carhart, Rosenberg, and Owens tone decay tests using 40 normal-hearing subjects. Differences in tone decay were evaluated for effects of experimental technique, frequency, hearing level and SPL of the stimuli.
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Wavelets and adaptive thresholding

Journal of Communications Technology and Electronics, 2014
The discrete wavelet transform and its application for signal denoising is considered. The article is oriented to readers unfamiliar with the wavelet theory and, therefore, basic definitions and theorems required for the understanding of the material below are presented at the beginning of the article.
M. V. Obidin, A. P. Serebrovski
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Increment thresholds and dark adaptation

Journal of Theoretical Biology, 1964
Abstract A quantitative theory of the increment thresholds and dark adaptation of the rod receptors in the human eye has been developed which gives an accurate fit with experimental data from the initial threshold to the saturation level of intensity with various amounts of rhodopsin bleaching.
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Adaptive Optical Threshold Gates

SPIE Proceedings, 1986
A high convergence modified fixed increment algorithm capable of adaptively computing linear or polynomial discriminant functions in two-class pattern recognition applications is proposed. A purely digital hybrid optical/electronic implementation of the adaptive algorithm is presented. The proposed adaptive gate is capable of handling either digital or
M. H. Hassoun, R. Arrathoon
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Fast adaptive PNN-based thresholding algorithms

Pattern Recognition, 2003
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Chung, K.L., Chen, W.Y.
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Clinical Observations on Excessive Threshold Adaptation

Archives of Otolaryngology - Head and Neck Surgery, 1958
In 1955, Lierle and Reger 1 reported an unusual finding in connection with their extensive studies of threshold tracings obtained with the Bekesy-type audiometer. When subjects were asked simply to trace threshold for a fixed frequency over a 20-minute period, they found that the tracings remained relatively constant in two cases of end-organ lesion ...
J, JERGER, R, CARHART, J, LASSMAN
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The adaptive threshold device

2016 IEEE NW Russia Young Researchers in Electrical and Electronic Engineering Conference (EIConRusNW), 2016
The article considers the development of an algorithm to detect targets in the presence of noise radar method using accumulation between periods.
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Adaptive estimation with soft thresholding penalties

Statistica Neerlandica, 2002
We show that various robust nonparametric regression estimators, such as the least absolute deviations estimator, can be made adaptive (up to logarithmic factors), by adding a soft thresholding type penalty to the loss function. As an example, we consider the situation where the roughness of the regression function is described by a single parameter p.
Loubes, Jean-Michel, van de Geer, Sara
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