scholarly journals OBSERVER CMF BASED VISUAL APPEARANCE COMPENSATION FOR NOVEL LIGHT SOURCE PROJECTION SYSTEM

2020 ◽  
Author(s):  
C.Y.H. Bai ◽  
C.F. Tseng ◽  
T.Y. Lu ◽  
L.C. Ou
Keyword(s):  
Light Source ◽  
Projection System ◽  
Visual Appearance

scholarly journals Application of Dimming Compensation Technology Via Liquid Crystal Lens for Non-Imaging Projection Laser Systems

Crystals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 122
Author(s):  
Yi-Chin Fang ◽  
Cheng Tsai ◽  
Da-Long Cheng
Keyword(s):  
Liquid Crystal ◽  
Light Source ◽  
Optical Design ◽  
Good Control ◽  
Laser Source ◽  
Projection System ◽  
Lens Array ◽  
Local Dimming ◽  
Optical Paths ◽  
Liquid Crystal Lens

The main purpose of this paper is to explore a newly developed optical design, then to further improve the overhead lighting contrast in the laser projector module. In terms of the structural design of the projector, a liquid crystal lens array was used as the local dimming system for the light source, in order to achieve the objective, which was to significantly improve the contrast facility of the projection system. Second, in terms of the design of the light source, the output method for the light source was a laser light source employing arrays of micro-scanning. The main purpose was to compensate for the dim spots in the hole between the lenses in each unit of the liquid crystal when the liquid crystal lens array was locally dimmed, and thus significantly improving the contrast facility of the projection system. In terms of the software simulation, a liquid crystal lens array was used to simulate a pore size of 2.0 mm and focal lengths of 9 cm and 23 cm. The end effect gave good control and adjustment of the bright and dark areas during local dimming of the projector’s imaging chip components. For a single laser source, the maximum contrast for local dimming was about 128:1, 438:1, and 244:1, for the Red (R), Green (G), and Blue (B) optical paths, respectively. The light efficiency scores were approximately 20.91%, 20.05%, and 24.45%, for the R, G, and B optical paths, respectively. After compensation using a micro-scanning light source, the defect of having dim spots between the pores was remedied, and the light adjustment area became more uniform while the contrasts became smaller. The maximum contrasts were approximately 52:1, 122:1, and 110:1, for the R, G, and B optical paths, respectively. For the projector, when the liquid crystal lenses were not transmissive, the maximum uniformity scores were 82.25%, 87.15%, and 88.43%, for the R, G, and B optical paths, respectively.

RELATION BETWEEN LIGHT SOURCE AND GROWTH OF BROILER CHICKENS

1974 ◽  
Vol 54 (4) ◽  
pp. 687-691 ◽  
Author(s):  
J. F. HURNIK ◽  
W. D. MORRISON ◽  
R. G. BROWN
Keyword(s):  
Light Source ◽  
Broiler Chickens ◽  
Spectral Composition ◽  
The Body ◽  
Fluorescent Light ◽  
Broiler Chicks ◽  
Ambulatory Activity ◽  
Visual Appearance ◽  
Significant Difference ◽  
Body Weights

Four hundred and forty vent-sexed commercial broiler chicks were used in this study. One half of this sample was exposed to common fluorescent light, the other half to a light source that in the spectral composition better approximates daylight characteristics (Vita-lite). Body weights of all birds were measured at weekly intervals. Weight of the body organs was measured on 20 birds randomly taken from each of four possible light source-sex combinations at 14-day intervals. The only significant difference in body weights linked with lighting was found in 2-wk-old chicks. High interactions between sex and lighting at this age revealed a positive effect of Vita-lite on females. In all other age categories, lighting did not affect body weights and did not interact with sex. Regression of body weights on age did not show any differentiation in growth related to the light source. Proportional weight of body organs did not indicate any significant effect of lighting. Birds in cages, illuminated with Vita-lite, when transferred to floor pens showed lower ambulatory activity than their counterparts from normal fluorescent light. Overall mortality during the first 14 days was lower in the Vita-lite group. Frequencies of subjective classifications of birds’ visual appearance showed evident sex × light source interactions only at the age of 14 days.

Design of Illuminating System for Liquid Crystal on Silicon Projection System on LED Light Source

2014 ◽  
Vol 51 (7) ◽  
pp. 072201
Author(s):  
赵斌 Zhao Bin ◽  
张国玉 Zhang Guoyu ◽  
陈启梦 Chen Qimeng ◽  
张健 Zhang Jian ◽  
王国名 Wang Guoming
Keyword(s):  
Liquid Crystal ◽  
Light Source ◽  
Projection System ◽  
Led Light ◽  
Liquid Crystal On Silicon ◽  
Illuminating System

Influence of Light Source and Cathodoluminescence on the Color Parameters of Ruby Red

2011 ◽  
Vol 492 ◽  
pp. 379-383 ◽  
Author(s):  
Xiang Li ◽  
Ying Guo
Keyword(s):  
Light Source ◽  
Power Distribution ◽  
Light Sources ◽  
Visual Appearance ◽  
Color Parameters ◽  
Red Color ◽  
Strong Luminescence ◽  
Hue Angle ◽  
The Impact ◽  
Sun Light

According to different light sources and cathodoluminescence (CL) intensity, the performance of color parameters (lightness L*, chromaticity a* and b*, chroma C*, hue angle ho) and chromophore contents (Cr3+, åFe) are studied to analyze the impact of all these elements on ruby red color. Ruby red under the standard light source D65 (a*=5.65 ~ 26.97, b*= -5.43~3.98) is similar with the color under natural sun-light. Purplish red ho Î (354.14°, 0.7°) with medium-low lightness (L*= 32 ~ 40) under D65 displays the best visual appearance, showing a relatively high value. Comparing with D65, standard light source A reveals ruby a deep red hue (a*= 10.61 ~ 37.39, b*= -6.59 ~ 7.50). Because of the strongest spectrum power distribution in the orange range and fluorescence of light source U30, the hue of orangish tone is mixed in ruby red (a*= 6.92 ~ 31.23, b*= 0.31 ~ 9.34). It is illustrated that åFe can inhibit the intensity of CL which is compared in different voltages. Low lightness purplish red is easy to be influenced by CL and always shows strong luminescence correspondingly. It is concluded that ruby purplish red has strong luminescence of CL which is usually supported by a few of åFe and medium-low lightness under D65, which has an excellent visual perception.

scholarly journals Performance of different metrics proposed to CIE TC 1-91

2017 ◽  
Vol 19 (2) ◽  
pp. 91 ◽  
Author(s):  
Pramod Bhusal ◽  
Rajendra Dangol
Keyword(s):  
Light Source ◽  
Area Index ◽  
Visual Appearance ◽  
Engineering Society ◽  
Quality Scale ◽  
Subjective Preference ◽  
Colour Rendering

The main aim of the article is to find out the performance of different metrics proposed to CIE TC 1-91. Currently, six different indexes have been proposed to CIE TC 1-91: Colour Quality Scale (CQS), Feeling of Contrast Index (FCI), Memory colour rendering index (MCRI), Preference of skin (PS), Relative gamut area index (RGAI) and Illuminating Engineering society Method for evaluating light source colour rendition (IES TM-30). The evaluation and analysis are based on previously conducted experiment in lighting booth. The analysis showed the area based metric FCI was good subjective preference indicator. The subjective preference was measured in terms of naturalness of objects, colourfulness of colour checker chart, and the visual appearance of the lit scene in the booth.

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