Chromaticity characteristics of several fluorescent dyes in cloth were studied in terms of chromaticity diagram. The dominant wavelength and color purity of the samples were calculated and chromaticity diagrams were d...Chromaticity characteristics of several fluorescent dyes in cloth were studied in terms of chromaticity diagram. The dominant wavelength and color purity of the samples were calculated and chromaticity diagrams were drawn to provide countermeasures with which the perceptual color attributes such as hue and saturation are correlated.展开更多
A new method based on the traditional method of ray scanning has been introduced to resolve the problem of judging the color in the chromaticity diagram by employing the line segments approximate curve—— using polyg...A new method based on the traditional method of ray scanning has been introduced to resolve the problem of judging the color in the chromaticity diagram by employing the line segments approximate curve—— using polygonal approximate closed curve. Then a vector coordinate could be used to describe the curve instead of curve equations. So it is easy to judge the topology relation between an area and a point or a locus. And any data processing method has been used to save memory, which makes the improved ray scanning method is quite useful in the measurement of color.展开更多
Data transmission with RGB LEDs is attracting significant research interest in VLC(Visible Light Communication).We consider the power optimization under brightness and communication requirements for RGB LEDs,and model...Data transmission with RGB LEDs is attracting significant research interest in VLC(Visible Light Communication).We consider the power optimization under brightness and communication requirements for RGB LEDs,and model the color constraint using the MacAdam ellipse instead of a fixed point in the chromaticity diagram.Then an optimization problem is formulated to determine the transmission power consumption and the corresponding coordinates in the chromaticity diagram.We propose a novel two-step algorithm to solve the optimization problem with lower implementation complexity.Numerical results show that the proposed approach shows the same performance as the optimal solution using a brute-force method,and requires the lower power consumption using MacAdam ellipse instead of merely a fixed point in the chromaticity diagram.展开更多
In order to solve the uncertainty of voice-to-color conversion in which one of the three voice features（loudness, tone, rhythm） is applied to control LED color, a linear conversion solution is proposed. And a chroma...In order to solve the uncertainty of voice-to-color conversion in which one of the three voice features（loudness, tone, rhythm） is applied to control LED color, a linear conversion solution is proposed. And a chromaticity diagram is defined by using hue definition on hue-saturation-lightness（HSL） hue ring and the normalization of CIE xyY which is a color standard defined by International Commission on Illumination（CIE）. The chromaticity diagram shows a linear relation between pitch and color, which is referred to conversions of other physical parameters as well. Based on the solution, red（R）, green（G） and blue（B） LEDs, the driving structure of a conversion circuit is designed and set up. The results indicate that signal processing of tone-to-color conversion is effective, from 30 Hz to 3 kHz with a resolution of 10 Hz mapped to the chromaticity diagram.展开更多
文摘Chromaticity characteristics of several fluorescent dyes in cloth were studied in terms of chromaticity diagram. The dominant wavelength and color purity of the samples were calculated and chromaticity diagrams were drawn to provide countermeasures with which the perceptual color attributes such as hue and saturation are correlated.
基金Key Projects from Science & Technology Depart ment of Hubei Province(2002AA101B06)
文摘A new method based on the traditional method of ray scanning has been introduced to resolve the problem of judging the color in the chromaticity diagram by employing the line segments approximate curve—— using polygonal approximate closed curve. Then a vector coordinate could be used to describe the curve instead of curve equations. So it is easy to judge the topology relation between an area and a point or a locus. And any data processing method has been used to save memory, which makes the improved ray scanning method is quite useful in the measurement of color.
基金supported by National Key Basic Research Program of China(No.2013CB329201)Key Program of National Natural Science Foundation of China(No.61631018)+2 种基金Key Research Program of Frontier Sciences of CAS(No.QYZDY-SSWJSC003),Key Project in Science and Technology of Guangdong Province(No.2014B010119001)Shenzhen Peacock Plan(No.1108170036003286)the Fundamental Research Funds for the Central Universities.
文摘Data transmission with RGB LEDs is attracting significant research interest in VLC(Visible Light Communication).We consider the power optimization under brightness and communication requirements for RGB LEDs,and model the color constraint using the MacAdam ellipse instead of a fixed point in the chromaticity diagram.Then an optimization problem is formulated to determine the transmission power consumption and the corresponding coordinates in the chromaticity diagram.We propose a novel two-step algorithm to solve the optimization problem with lower implementation complexity.Numerical results show that the proposed approach shows the same performance as the optimal solution using a brute-force method,and requires the lower power consumption using MacAdam ellipse instead of merely a fixed point in the chromaticity diagram.
文摘In order to solve the uncertainty of voice-to-color conversion in which one of the three voice features（loudness, tone, rhythm） is applied to control LED color, a linear conversion solution is proposed. And a chromaticity diagram is defined by using hue definition on hue-saturation-lightness（HSL） hue ring and the normalization of CIE xyY which is a color standard defined by International Commission on Illumination（CIE）. The chromaticity diagram shows a linear relation between pitch and color, which is referred to conversions of other physical parameters as well. Based on the solution, red（R）, green（G） and blue（B） LEDs, the driving structure of a conversion circuit is designed and set up. The results indicate that signal processing of tone-to-color conversion is effective, from 30 Hz to 3 kHz with a resolution of 10 Hz mapped to the chromaticity diagram.
