scholarly journals Quantitative Weathering Assessment of Rock Slope using CIELAB Color Space and Image Analysis Technique

2021 ◽  
Author(s):  
Mazlina Razali ◽  
Muhd Herman Jamal ◽  
Mohd Ashraf Mohamad Ismail ◽  
Intan Norsheira Yusoff ◽  
Sharan Kumar Nagendran ◽  
...  
Keyword(s):  
Image Analysis ◽  
Structural Control ◽  
Rock Slope ◽  
Color Space ◽  
Visual Assessment ◽  
Geological Structure ◽  
Color Changes ◽  
Cielab Color Space ◽  
Analysis Technique ◽  
Cielab Color

Abstract Quantitative weathering assessment using color changes is one of the new tools for slope stability assessment. In many other engineering field, CIELAB color space and image analytical tools have aided in enhancing the conventional method or inaccuracy due to the subjective and qualitative nature of visual assessment. This study focuses on the granitic rock slope surface assessment because of the predominant rock formation of granite in Malaysia. The 3D model of the rock slope was analyzed to extract the geological planes using compass plugin in Cloud Compare software and verified by manual compass mapping via scanline survey. Findings show that the a* and b* values increased with an increase in weathering results. This study focuses on the 50 points of measurement of rock slope and indicated a positive correlation of a* and b* with R2=0.9027. The image analysis result of the rock slope shows that major zoning (74%) is susceptible to failure due to structural control whilst another 26% are controlled by significant weathering in the grade IV-VI. This outcome is strongly verified via a geomechanical test, geological structure, and mineralogical assessment. The aforementioned mechanism is recommended in any geotechnical and technical purpose in enhancing the method of weathering assessment because image analysis provides reliable measurements in addition to the manual visual inspection.

Color changes of ash wood (Fraxinus excelsior L.) caused by thermal modification in air and steam

2021 ◽  
Vol 116 ◽  
pp. 21-27
Author(s):  
Jakub Gawron ◽  
Monika Marchwicka
Keyword(s):  
Color Space ◽  
Color Difference ◽  
Thermal Modification ◽  
Fraxinus Excelsior ◽  
Space Model ◽  
Color Changes ◽  
Cielab Color Space ◽  
Before And After ◽  
Total Color Difference ◽  
Cielab Color

Color changes of ash wood (Fraxinus excelsior L.) caused by thermal modification in air and steam. Ash wood samples of 20x20x30 mm were subjected to thermal modification in different conditions. The thermal modification was conducted in air at 190 °C and in steam at 160 °C. For both environments modification lasted 2, 6 and 10 hours. Samples color parameters were measured before and after thermal modification on the basis of the mathematical CIELab color space model. Changes in all parameters (L, a and b) were observed, the highest in lightness (L) - darker color. The total color difference (ΔE) and chromaticity change (ΔC) were calculated for all samples. The highest value of ΔE was obtained for wood modified in the air at 190 °C for 10 h. The highest value of ΔC was obtained for wood modified in steam at 160 °C for 10 h. However, the value obtained for wood modified in the air at 190 °C for 10 h were only slightly lower.

Changes in the content of chlorophylls and carotenoids in the rind of Fino 49 lemons during maturation and their relationship with parameters from the CIELAB color space

2019 ◽  
Vol 243 ◽  
pp. 252-260 ◽  
Author(s):  
A. Conesa ◽  
F.C. Manera ◽  
J.M. Brotons ◽  
J.C. Fernandez-Zapata ◽  
I. Simón ◽  
...  
Keyword(s):  
Color Space ◽  
Cielab Color Space ◽  
Cielab Color

Development of a customized whiteness index for dentistry based on CIELAB color space

2016 ◽  
Vol 32 (3) ◽  
pp. 461-467 ◽  
Author(s):  
María del Mar Pérez ◽  
Razvan Ghinea ◽  
María José Rivas ◽  
Ana Yebra ◽  
Ana María Ionescu ◽  
...  
Keyword(s):  
Color Space ◽  
Whiteness Index ◽  
Cielab Color Space ◽  
Cielab Color

Analysis on Color-Distinguishing Threshold of Printed Samples and Chromatic Characteristics of Human Eyes

2012 ◽  
Vol 262 ◽  
pp. 18-21
Author(s):  
Wen Yu Li ◽  
Hao Liang Dong
Keyword(s):  
Theoretical Basis ◽  
Color Space ◽  
Evaluation Study ◽  
Psychophysical Method ◽  
Threshold Values ◽  
Cielab Color Space ◽  
Visual Characteristics ◽  
Human Eyes ◽  
Cielab Color ◽  
Significant Data

In order to study the visual characteristics of the human eye on color-distinguishing threshold levels, an experiment, of which the results provide significant data reference and theoretical basis for improvement of color evaluation methods of printing products, was carried out with 20 observers whose visual characteristics are normal. The observers were provided 5 basic colors that the CIE recommended for color evaluation study, and the constant stimulation psychophysical method was used in the visual experiment. The color patches were printed out with small color threshold variations. The color-distinguishing thresholds and visual characteristics were obtained through the experiment. Results showed that the notable color threshold values of green and red patches were relative larger, indicating larger visual tolerances. It is also shown that the red region in CIELAB color space has the best uniformity to human eyes among the five colors.

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