Development of a Camera System for the Acquisition of High-Fidelity Colors

Ejaz, Tahseen; Horiuchi, Tomohiro; Ohashi, Gosuke; Shimodaira, Yoshifumi

doi:10.1093/ietele/e89-c.10.1441

Cited by 17 publications

(7 citation statements)

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“…The RC500 camera has a spectrophotometer mounted inside the optical system for internal color calibration, and it is equipped with three optical filters that convert the color gamut to XYZ values [30][31][32] . Therefore, this camera enables accurate and repeatable color measurements, and its sensitivity is equivalent to that of human eyes, thus faithfully reproducing the human perception of colors 30,33) .…”

Section: Color Difference Between Intact Ground and Restored Teethmentioning

confidence: 95%

Does the thickness of universal-shade composites affect the ability to reflect the color of background dentin?

et al. 2023

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The recently introduced resin composites with a universal shade are claimed to match any tooth color. In this study, it was examined how composite thickness affects the color adjustment of conventional and universal-shade composites to background dentin. Thirty sound human central incisors of various shade were used, and color differences between their intact labial surfaces, exposed dentin surfaces and composite restorations (thickness 1-3 mm) were evaluated. In addition, the translucency, light transmission characteristics, and spectral reflectance of the composites were measured. The results showed that universal-shade composites outperformed conventional composites of A2 shade in the adjustment of hue and chroma (p<0.05) but not in lightness (p>0.05). The color adjustment potential of all composites significantly decreased as their thickness increased (p<0.05). The effect of thickness on Omnichroma and Omnichroma Flow was less marked, presumably because of their higher translucency (p<0.05) and structural coloration which induces light reflectance in the yellow-to-red range.

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Section: Color Difference Between Intact Ground and Restored Teethmentioning

confidence: 95%

Does the thickness of universal-shade composites affect the ability to reflect the color of background dentin?

et al. 2023

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“…Color photographs of the teeth were taken using a CIE XYZ digital camera (RC500, PaPaLaB, Shizuoka, Japan), because it was previously reported to truly simulate human color perception 14,15) . Standardized conditions were ensured by placing the teeth in a black box and using the D65 standard illuminant with 45°/0° viewing geometry.…”

Section: Analysis Of Color Adjustment Potentialmentioning

confidence: 99%

Effect of filler load on structural coloration and color adjustment potential of resin composites

et al. 2023

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The color-matching ability of single-shade composites Omnichroma (OMN) and Omnichroma Flow (OCF) is ensured by structural color, which arises from monodisperse 260 nm spherical fillers. This study evaluated how filler load influences the color adjustment potential of composite restorations to human teeth of various shades. The performance of composites containing the 260 nm spherical fillers -OMN (79 wt%), OCF (71 wt%), and experimental composites R1 (65 wt%), and R2 (60 wt%)-was compared to two conventional A2-shade composites and a transparent composite. Additionally, the translucency parameter, spectral reflectance, and light transmission properties were assessed. Composites with a lower load of the 260 nm spherical fillers exhibited lower light diffusion and lower reflectance in the yellow-to-red range (580-650 nm), which is characteristic for the structural color of OMN and OCF. The best color adjustment was achieved with OCF, presumably due to its high translucency and uniform spectral reflectance.

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“…In computer vision, video and graphics, we rely upon cameras and rendering contexts to capture and reproduce colour information. Moreover, the accurate capture and reproduction of colours as acquired by digital camera sensors is an active area of research which has applications in colour correction [22][23][24], camera simulation [25] and sensor design [26].…”

Section: Recovering Camera Spectral Sensitivity Functionsmentioning

confidence: 99%

Max-Correlation Embedding Computation

Robles-Kelly

2014

Lecture Notes in Computer Science

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In this paper, we present a method to compute an embedding matrix which maximises the dependence of the embedding space upon the graph-vertex coordinates and the incidence mapping of the graph. This treatment leads to a convex cost function which, by construction, attains its maximum at the leading singular value of a matrix whose columns are given by the incidence mapping and the embedded vertex coordinates. This, in turn, maximises the correlation between the spaces in which the embedding and the graph vertex coordinates are defined. It also maximises the dependence between the embedding and the incidence mapping of the graph. We illustrate the utility of the method for purposes of approximating the colour sensitivity functions of a set of over 20 commercially available digital cameras using a library of spectral reflectance measurements.

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Development of a Camera System for the Acquisition of High-Fidelity Colors

Cited by 17 publications

References 0 publications

Does the thickness of universal-shade composites affect the ability to reflect the color of background dentin?

Does the thickness of universal-shade composites affect the ability to reflect the color of background dentin?

Effect of filler load on structural coloration and color adjustment potential of resin composites

Max-Correlation Embedding Computation

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