The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
How to choose lighting source to enhance a gratifying ambience so as to improve impression and evaluation of the fruits was investigated in this study. Firstly, a laboratory functioning with controllable LED light source and physical quantity measurement was constructed. Secondly, subjective visual satisfaction experiments on the testees with LED light source combining with different color temperature,...
An indoor positioning method based on metameric white light sources and subpixels on a color image sensor is proposed in this paper. Metameric white light sources are obtained by merging multiple-color light-emitting diode (LED) chips with different intensity ratios. The output intensity ratios of subpixels on color image sensor at the receiver are employed to identify the respective metameric white...
The appearance of an object depends on the color as well as the direction of a light source illuminating the object. The progress of LEDs enables us to capture the images of an object under multispectral and multidirectional light sources. Separating diffuse and specular reflection components in those images is important for preprocessing of various computer vision techniques such as photometric stereo,...
Metamerism is a phenomenon where two objects recognized as having different colors under one light are also recognized as having the same color under another light. This research proposes technology for actualizing artistic illusion that exploits metamerism. Specifically, the purpose of the research relates to automatic calculation of blending ratios of oil paints that cause metamerism to occur under...
The optimization matching procedure for specific LED spectrum matching is proposed by the normalized correlation coefficient and generalized reduced gradient method in this study. The different spectrum means different color temperature, color rendering index, and lighting quality features. However, the specific spectrum for human centric lighting or light therapy may not be achieved by single light...
This study analyzed the variation of the correlated color temperature (CCT) of white light, which was emitted from Lambertian-type LEDs, and passed through a volume scattering diffuser (VSD). The tested VSD, fabricated by mixing scattering particles (PMMA) in glue (epoxy), exhibited various concentration weights of the scattering particles. Measurements showed that the CCT values decreased and the...
This paper investigates the correlation between color quality and energy efficiency of indoor lighting control. The color quality, in terms of visual performance and comfort, is quantified using three measurements: illuminance, Color Rendering Index, and Correlated Color Temperature. Several experiments have been conducted to evaluate the potential energy savings of using different portions of light...
The aim of this research is to evaluate the performance of different uniform colour spaces and colour rendering indices on the colour fidelity of light sources. To achieve this aim, a psychophysical experiment was carried out which invited 10 observers to assess the colour differences of the identical samples viewed under two sources, using simultaneous colour matching and grey scale method. Percentages...
We propose a novel method for single-shot photometric stereo by spectral multiplexing. The output of our method is a simultaneous per-pixel estimate of the surface normal and full-color reflectance. Our method is well suited to materials with varying color and texture, requires no time-varying illumination, and no high-speed cameras. Being a single-shot method, it may be applied to dynamic scenes...
Based on the principles of color recognition and the characteristics of color, a color recognition system which adopted the S7505 sensor and the SCM has been designed. This system combined full spectrum light source with narrow-band multi-color RGB Silicon Photodiode, thus, the color can be collected and processed in printing reliably and the color information of object also can be recognized more...
To prevent the output white light from being experienced with color deviation due to temperature effect on the performance of light-emitting diode (LED), a mixed-light control module is developed, by integrating programmable system on chip (PSoC) with photo-diode sensor devices, to examine the ambient temperature and feedback voltage level of RGB photodiodes. Also, a mixing light color criterion of...
A visualization system has been constructed to provide an accurate representation of a group of surface colours under a range of different light sources. The impetus for this work has come from the burgeoning supply of new high-output LED (light-emitting diode) sources now entering the market. The system will be used to test the validity of the CIE (International Commission on Illumination) colour...
The recognition of contours, colors and movements, with absolute precision and less uncertainty, is essential for surgeon. In order to guarantee the maximum visual force it is important the illuminating parameters could be perfectly adapted to current operating room conditions. While surgery fields of reduced dimensions require as much light, surgical interventions that take place in the deep cavities...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.