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OPTICAL SOC- AMERICA 2016 Journal of the Optical Society of America B Vol.33 No.3
<P>We present an analytical study of susceptibility in pump-probe laser spectroscopy for an atomic medium composed of two-level atoms in the Doppler-broadened limit. We derive an accurate analytical formula for susceptibility up to the first (arbitrary) order at the Rabi frequency of the probe (pump) beam. This is expressed in a succinct single term rather than as a complicated summation, as presented in previous papers. We also derive analytical solutions for the linewidth and peak value of the absorption spectrum of the probe beam. (C) 2016 Optical Society of America</P>
OPTICAL SOC- AMERICA 2014 Journal of the Optical Society of America. A, Opti Vol.31 No.2
Based on complex-variable analysis of a Fabry-Perot resonator as a multimode nonsymmetric two-port waveguide device, two versions of equivalent-circuit configurations are presented: Starting from a renewed study on singlemode two-pole circuits, we develop two respective multimode equivalent circuits of an almost identical configuration: one for the reflection coefficient and the other for the pass-through transmission coefficient. In the mathematics language of complex-variable analysis, the two models successfully 'approximate' the two scattering coefficients through two 'uniformly converging' partial-fraction series expansions. (C) 2014 Optical Society of America
OPTICAL SOC- AMERICA 2014 Journal of the Optical Society of America. A, Opti Vol.31 No.2
In the first part of a two-part study on the equivalent-circuit representation of any given Fabry-Perot resonator (FPR) that supports, by nature, infinitely many resonance modes, the complex-variable pole-zero structure of its scattering coefficients is extensively analyzed in general terms through partial-fraction expansion based on a corollary to Mittag-Leffler's theorem for meromorphic functions. By finding the right offset constant in the expansion from the theory, we present two sets of uniformly converging series of partial fractions for the two scattering coefficients. We compare quality of convergence between the two series sets and find that a set obtained by the fraction-reciprocated reflection coefficient for the FPR is relatively better than the other one, which is fortunate for the subsequent work in the second part. (C) 2014 Optical Society of America
Hue-preserving and saturation-improved color histogram equalization algorithm
Song, Ki Sun,Kang, Hee,Kang, Moon Gi OPTICAL SOC- AMERICA 2016 Journal of the Optical Society of America. A, Opti Vol.33 No.6
<P>In this paper, an algorithm is proposed to improve contrast and saturation without color degradation. The local histogram equalization (HE) method offers better performance than the global HE method, whereas the local HE method sometimes produces undesirable results due to the block-based processing. The proposed contrast-enhancement (CE) algorithm reflects the characteristics of the global HE method in the local HE method to avoid the artifacts, while global and local contrasts are enhanced. There are two ways to apply the proposed CE algorithm to color images. One is luminance processing methods, and the other one is each channel processing methods. However, these ways incur excessive or reduced saturation and color degradation problems. The proposed algorithm solves these problems by using channel adaptive equalization and similarity of ratios between the channels. Experimental results show that the proposed algorithm enhances contrast and saturation while preserving the hue and producing better performance than existing methods in terms of objective evaluation metrics. (C) 2016 Optical Society of America</P>
Contrast-dependent saturation adjustment for outdoor image enhancement
Wang, Shuhang,Cho, Woon,Jang, Jinbeum,Abidi, Mongi A.,Paik, Joonki OPTICAL SOC- AMERICA 2017 Journal of the Optical Society of America. A, Opti Vol.34 No.1
<P>Outdoor images captured in bad-weather conditions usually have poor intensity contrast and color saturation since the light arriving at the camera is severely scattered or attenuated. The task of improving image quality in poor conditions remains a challenge. Existing methods of image quality improvement are usually effective for a small group of images but often fail to produce satisfactory results for a broader variety of images. In this paper, we propose an image enhancement method, which makes it applicable to enhance outdoor images by using content-adaptive contrast improvement as well as contrast-dependent saturation adjustment. The main contribution of this work is twofold: (1) we propose the content-adaptive histogram equalization based on the human visual system to improve the intensity contrast; and (2) we introduce a simple yet effective prior for adjusting the color saturation depending on the intensity contrast. The proposed method is tested with different kinds of images, compared with eight state-of-the-art methods: four enhancement methods and four haze removal methods. Experimental results show the proposed method can more effectively improve the visibility and preserve the naturalness of the images, as opposed to the compared methods. (C) 2016 Optical Society of America</P>
Monitor brightness changes under a wide range of surround conditions
Baek, Ye Seul,Kwak, Youngshin,Park, Seung-ok OPTICAL SOC- AMERICA 2017 Journal of the Optical Society of America. A, Opti Vol.34 No.2
<P>Display brightness data were collected under a wide range of surround conditions. A 24 in. (60.96 cm) LCD display was used to generate color stimuli, and a 107 in. (271.78 cm) two-dimensional illuminator was used to generate various surround conditions. The brightness values of the display under 89 monitor-surround-luminance combinations were collected from 10 or 24 observers. The surround ratio, S-R, i.e., the luminance ratio between the surround and the monitor, varied from 0 to 90. Based on the collected brightness data, we propose a new c value as the log function of the surround ratio, SR, to improve the performance of the CIECAM02 brightness predictor Q. (C) 2017 Optical Society of America</P>