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Keywords = hue and wavelength curve

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10 pages, 3989 KB  
Article
Image Reconstruction and Investigation of Factors Affecting the Hue and Wavelength Relation Using Different Interpolation Algorithms with Raw Data from a CMOS Sensor
by Eun-Min Kim, Kyung-Kwang Joo and Hyeon-Woo Park
Photonics 2023, 10(11), 1216; https://doi.org/10.3390/photonics10111216 - 31 Oct 2023
Viewed by 1730
Abstract
An image processing method was employed to obtain wavelength information using light irradiated during camera exposure. Physically, hue (H) and wavelength (W) are closely related. Once the H value is known through image pixel analysis, the wavelength can be obtained. In this paper, [...] Read more.
An image processing method was employed to obtain wavelength information using light irradiated during camera exposure. Physically, hue (H) and wavelength (W) are closely related. Once the H value is known through image pixel analysis, the wavelength can be obtained. In this paper, the H-W curve was investigated from 400 to 650 nm using raw image data with a complementary metal oxide semiconductor (CMOS) sensor technology. We reconstructed the H-W curve from raw image data based on a demosaicing method with 2 × 2 pixel images. To date, no study has reported on reconstructing the H-W curve using several different interpolation algorithms in the 400~650 nm wavelength region. In addition, several factors affecting the H-W curve with a raw digital image, such as exposure time, aperture, and international organization for standardization (ISO) settings, were investigated for the first time. Full article
(This article belongs to the Special Issue Advanced Photonic Sensing and Measurement II)
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10 pages, 3465 KB  
Article
Estimating Fluor Emission Spectra Using Digital Image Analysis Compared to Spectrophotometer Measurements
by Hyeon-Woo Park, Ji-Won Choi, Kyung-Kwang Joo, Na-Ri Kim and Chang-Dong Shin
Sensors 2023, 23(9), 4291; https://doi.org/10.3390/s23094291 - 26 Apr 2023
Cited by 3 | Viewed by 3223
Abstract
This paper describes a practical method for obtaining the spectra of lights emitted by a fluor in a liquid scintillator (LS) using a digital camera. The emission wavelength results obtained using a digital image were compared with those obtained using a fluorescence spectrophotometer. [...] Read more.
This paper describes a practical method for obtaining the spectra of lights emitted by a fluor in a liquid scintillator (LS) using a digital camera. The emission wavelength results obtained using a digital image were compared with those obtained using a fluorescence spectrophotometer. For general users, conventional spectrophotometers are expensive and difficult to access. Moreover, their experimental measurement setup and processes are highly complicated, and they require considerable care in handling. To overcome these limitations, a feasibility study was performed to obtain the emission spectrum through image analysis. Specifically, the emission spectrum of a fluor dissolved in a liquid scintillator was obtained using digital image analysis. An image processing method was employed to convert the light irradiated during camera exposure into wavelengths. Hue (H) and wavelength (W) are closely related. Thus, we obtained an H-W response curve in the 400~450 nm wavelength region, using a light-emitting diode. Another relevant advantage of the method described in this study is its non-invasiveness in sealed LS samples. Our results showed that this method has the potential to accurately investigate the emission wavelengths of fluor within acceptable uncertainties. We envision the use of this method to perform experiments in chemistry and physics laboratories in the future. Full article
(This article belongs to the Section Optical Sensors)
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11 pages, 3129 KB  
Article
Investigation of the Hue–Wavelength Response of a CMOS RGB-Based Image Sensor
by Hyeon-Woo Park, Ji-Won Choi, Ji-Young Choi, Kyung-Kwang Joo and Na-Ri Kim
Sensors 2022, 22(23), 9497; https://doi.org/10.3390/s22239497 - 5 Dec 2022
Cited by 12 | Viewed by 7973
Abstract
In this study, a non-linear hue–wavelength (H-W) curve was investigated from 400 to 650 nm. To date, no study has reported on H-W relationship measurements, especially down to the 400 nm region. A digital camera mounted with complementary metal oxide semiconductor (CMOS) image [...] Read more.
In this study, a non-linear hue–wavelength (H-W) curve was investigated from 400 to 650 nm. To date, no study has reported on H-W relationship measurements, especially down to the 400 nm region. A digital camera mounted with complementary metal oxide semiconductor (CMOS) image sensors was used. The obtained digital images of the sample were based on an RGB-based imaging analysis rather than multispectral imaging or hyperspectral imaging. In this study, we focused on the raw image to reconstruct the H-W curve. In addition, several factors affecting the digital image, such as exposure time or international organization for standardization (ISO), were investigated. In addition, cross check of the H-W response using laser was performed. We expect that our method will be useful as an auxiliary method in the future for obtaining the fluor emission wavelength information. Full article
(This article belongs to the Special Issue Optical Spectral Sensing and Imaging Technology)
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11 pages, 4188 KB  
Article
The Spectrum of Light Emitted by LED Using a CMOS Sensor-Based Digital Camera and Its Application
by Hyeon-Woo Park, Ji-Won Choi, Ji-Young Choi, Kyung-Kwang Joo and Na-Ri Kim
Sensors 2022, 22(17), 6418; https://doi.org/10.3390/s22176418 - 25 Aug 2022
Cited by 5 | Viewed by 4830
Abstract
We introduced a digital photo image analysis in color space to estimate the spectrum of fluor components dissolved in a liquid scintillator sample through the hue and wavelength relationship. Complementary metal oxide semiconductor (CMOS) image sensors with Bayer color filter array (CFA) technology [...] Read more.
We introduced a digital photo image analysis in color space to estimate the spectrum of fluor components dissolved in a liquid scintillator sample through the hue and wavelength relationship. Complementary metal oxide semiconductor (CMOS) image sensors with Bayer color filter array (CFA) technology in the digital camera were used to reconstruct and decode color images. Hue and wavelength are closely related. To date, no literature has reported the hue and wavelength relationship measurements, especially for blue or close to the UV region. The non-linear hue and wavelength relationship in the blue region was investigated using a light emitting diode source. We focused on this wavelength region, because the maximum quantum efficiency of the bi-alkali photomultiplier tube (PMT) is around 430 nm. It is necessary to have a good understanding of this wavelength region in PMT-based experiments. The CMOS Bayer CFA approach was sufficient to estimate the fluor emission spectrum in the liquid scintillator sample without using an expensive spectrophotometer. Full article
(This article belongs to the Special Issue Feature Papers in Optical Sensors 2022)
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