The impact of correlated colour temperature variation from a tuneable LED lamp on colour sample appearance shift in CIELAB colour space

Revantino,; Mangkuto, Rizki A.; Suprijanto,; Soelami, F.X. Nugroho

doi:10.1016/j.ijleo.2022.169707

Cited by 3 publications

(2 citation statements)

References 37 publications

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“…The differences of the L* values found between instruments could be due to differences in methodologies and, or light source differences. It has been reported by Revantino et al, (2022) that temperature and device geometry can influence L* scores; however, the same illuminants are used with both instruments, and 45°/0° is the measurement geometry for both instruments (Table 2.) A brighter light source could explain the differences in L* values.…”

Section: Discussionmentioning

confidence: 99%

Detecting color differences in lentil flour samples using an inexpensive, hand-held colorimeter

Viscarra,

Vargas,

Jardine

et al. 2024

Preprint

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Premise: The Nix Spectro 2 was developed to obtain CIEL*a*b* values from small samples and is an affordable alternative to the more expensive spectrophotometers typically used to assess food color. Methods: To validate the use of the Nix for lentil seed quality research, eight genotypes in three different field trials, were evaluated for flour color using HunterLab (illuminant C) and Nix (illuminants D50 and C) instruments and results compared for consistency. Results: The a* and b* Nix scores were comparable to those obtained with the HunterLab (r2 = 0.9-0.95). L* scores had lower correlation values: 0.61 and 0.58 when comparing HunterLab (C) with Nix (D50) and Nix (C), respectively. Discussion: Lower L* correlations could be a result of the influence of direct light exposure during HunterLab scans. In contrast, the Nix uses more technical repetitions per scan and avoids direct light exposure with the use of an adaptor, suggesting the L* Nix values are more reliable than those from the HunterLab. We observed that the Nix procedures are more repeatable and rigorous, validating its use for assessing color, especially for small samples, a common limitation within breeding programs.

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Section: Discussionmentioning

confidence: 99%

Detecting color differences in lentil flour samples using an inexpensive, hand-held colorimeter

Viscarra,

Vargas,

Jardine

et al. 2024

Preprint

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“…The CIELab color space system is the most complete color model customarily used to describe all colors visible to the human eye [22,23] . It has achieved good results in the evaluation of color shades.…”

Section: Introduction mentioning

confidence: 99%

Monocular vision for variable spray control system

Sun¹,

Liu²,

Luo³

et al. 2022

International Journal of Agricultural and Biological Engineering

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The monocular vision-based system can obtain the leaf wall area characterizing the canopy parameter for online detection and real-time variable spraying, aiming to improve the accuracy of orchard spraying equipment and the utilization efficiency of pesticide. This study established a spraying system, in which canopy parameters were collected by monocular vision, and the spray volume decision coefficient was constructed by the leaf wall area and the L* value in International Commission on Illumination Lab color space to control the duty cycle of each solenoid valve to achieve variable spraying. Four spray flow models were designed to determine the spray volume decision coefficient. The coefficients of determination of the spray volumes with the duty cycle range of 15% to 65% were all over 94 and the error of the leaf wall area values obtained using the improved super green algorithm (calculated as ExG = 2.1G-1.1R-1.1B) was only 0.5%. The test showed that there is a negative relationship between canopy denseness and L*, and the value of L* is smaller in the dense area compared with the sparse area; the actual flow generated by the system is similar to the theoretical flow when the duty cycle is 65%. The field validation tests showed that the variable spraying system could refine the droplet size and increase the droplet density to a certain extent with the same coverage rate, which had advantages over the continuous spraying. In terms of droplet deposition, D V0.1 and D V0.9 were reduced by 2 μm and 18 μm, respectively, and the increase of droplet density to 75 droplets/cm 2 . At the same time, the improvement of droplet distribution uniformity and droplet penetration by 16% and 3%, respectively. Compared with continuous spraying, variable spraying can achieve 55.64% savings. The study demonstrates the feasibility of monocular vision in guiding spraying operations and provides a reference for the use of monocular vision in plant protection operations.

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Physicochemical properties of sweet limes (Citrus limetta) during storage at different temperatures

Reyna-Gonzales,

Pesantes-Gallardo,

Huamán-Grandez

et al. 2024

Food Sci. Preserv.

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The loss of nutrients from sweet lime (Citrus limetta) by poor postharvest storage represents a significant problem today, damaging these fruits’ quality and market value. This study aimed to evaluate the physicochemical properties of sweet limes during storage at different temperatures (RT-21°C, 2°C, and 4°C). The limes were harvested at full physiological maturity. Water activity (Aw), pH, color index, total soluble solids, titratable acidity, and ripeness index were determined during 15 days of storage. In addition, antioxidant activity and phenolic content were determined. The results indicate that keeping the sweet lime at a temperature of 4°C is the most favorable condition for optimal conservation, as reflected by the reduction in Aw, titratable acidity, total soluble solids and ripeness index of the fruit. The values obtained indicate slower decomposition and conservation of freshness and flavor. In addition, it was found that at this temperature, the fruit’s antioxidant activity and phenolic content were significantly increased. In addition, total polyphenols were better preserved at 2°C compared to room temperature (RT) and 4°C. However, ABTS and DPPH levels remained constant at 4°C and 2°C throughout the study time and were higher than at RT.

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The impact of correlated colour temperature variation from a tuneable LED lamp on colour sample appearance shift in CIELAB colour space

Cited by 3 publications

References 37 publications

Detecting color differences in lentil flour samples using an inexpensive, hand-held colorimeter

Detecting color differences in lentil flour samples using an inexpensive, hand-held colorimeter

Monocular vision for variable spray control system

Physicochemical properties of sweet limes (Citrus limetta) during storage at different temperatures

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