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논문 기본 정보

자료유형
학술대회자료
저자정보
Juan Ojeda (University of Granada) Juan Luis Nieves (University of Granada) Javier Romero (University of Granada)
저널정보
한국색채학회 AIC 2017 Jeju 2017 AIC CONGRESS
발행연도
2017.10
수록면
471 - 475 (5page)

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초록· 키워드

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Although the power spectra of natural images has been extensively analyzed and studied, the influence of daylight in modeling other second order image statistics is not fully understood and has deserved little attention. The power spectra of natural images decreases as a function of frequency and it is well known that, on a log-log scale, amplitude as function of frequency lies on a straight lines. The aim of this work was to analyze the influence of daylight changes in the power spectra and signatures derived from 600 color images, which were rendered under 108 natural illuminants with Correlated Color Temperatures (CCT) from 2,735K to 25,889K. Our results suggest that the power spectra analyzed in terms of L*, a*, and b* components shows different behaviors. It seems that luminance information do not depend on the CCT as opposed to the analysis along chromatic a* and b* image components showing differences for different daylights. The spectral slope analysis of the corresponding power law shows local minima around 5,800K in the oblique orientation and are almost constant above 12,000K for all the orientations. The spectral signatures for the color Blue-Yellow and Red-Green components also show different areas and contours across daylights, being significant for the former. A reduction of the area that encloses power spectrum greater than 60% of its maximum value are found again around a CCT of 5,500K for the chromatic channels, with higher presence of vertical and horizontal frequencies in the b* component for that CCT.

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ABSTRACT
INTRODUCTION
METHOD AND RESULTS
CONCLUSSIONS
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UCI(KEPA) : I410-ECN-0101-2019-651-000502456