Use of spectral characteristics of DSLR cameras with Bayer filter sensors

Cheremkhin, Pavel A.; Lesnichii, V. V.; Petrov, Nikolay V.

doi:10.1088/1742-6596/536/1/012021

Cited by 13 publications

(8 citation statements)

References 11 publications

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“…The hyperspectral reconstruction from originally measured RGB image data may involve technical adjustment issues, such as different pixel sizes between mono and RGB cameras and RGB color interpolation of adjacent pixels. Indeed, most common 3-color sensors (e.g., Bayer filter sensor) interpolate missing color information in selected pixel positions using a demosaicing algorithm [48]. Each pixel records only of the RGB colors in a format of a grid or a 3-color checkerboard.…”

Section: Discussionmentioning

confidence: 99%

Data-driven imaging of tissue inflammation using RGB-based hyperspectral reconstruction toward personal monitoring of dermatologic health

Kim

Visbal-Onufrak

Konger

et al. 2017

Biomed. Opt. Express

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Sensitive and accurate assessment of dermatologic inflammatory hyperemia in otherwise grossly normal-appearing skin conditions is beneficial to laypeople for monitoring their own skin health on a regular basis, to patients for looking for timely clinical examination, and to primary care physicians or dermatologists for delivering effective treatments. We propose that mathematical hyperspectral reconstruction from RGB images in a simple imaging setup can provide reliable visualization of hemoglobin content in a large skin area. Without relying on a complicated, expensive, and slow hyperspectral imaging system, we demonstrate the feasibility of determining heterogeneous or multifocal areas of inflammatory hyperemia associated with experimental photocarcinogenesis in mice. We envision that RGB-based reconstructed hyperspectral imaging of subclinical inflammatory hyperemic foci could potentially be integrated with the built-in camera (RGB sensor) of a smartphone to develop a simple imaging device that could offer affordable monitoring of dermatologic health.

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Section: Discussionmentioning

confidence: 99%

Data-driven imaging of tissue inflammation using RGB-based hyperspectral reconstruction toward personal monitoring of dermatologic health

Kim

Visbal-Onufrak

Konger

et al. 2017

Biomed. Opt. Express

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“…Unfiltered samples appeared with various red hues ranging from pink to dark brown; thus, we investigated absorbance in the blue region of the visible spectra. Figure 3a shows the UV-visible spectra in the range 175-850 nm and an enlarged view of the range 430-475 nm (inset), which corresponds with the typical bandpass range of the blue component of a Bayer filter found in many digital cameras [43].…”

Section: Resultsmentioning

confidence: 93%

Estimation of available epinephrine dose in expired and discolored autoinjectors via quantitative smartphone imaging

et al. 2020

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Epinephrine autoinjectors (EAIs) are important first aid medications for treating anaphylaxis. A 10-fold price increase over the past 12 years and evidence that expired EAIs may still contain significant doses of available epinephrine have motivated interest in the efficacy of expired EAIs as treatments of last resort. Degradation of expired EAIs, which can be caused by improper storage conditions, results in various degrees of discoloration of the epinephrine solution. Previous studies have determined that significant epinephrine remains available in expired EAIs, but these have only considered EAIs that show no discoloration. Here, we investigate the potential for colorimetric estimation of available epinephrine dose based on the degree of discoloration in expired EAIs. The correlation of available epinephrine dose and time since expiration date was poor (r = − 0.37), as determined by an industry standard UHPLC protocol. Visible absorbance of the samples integrated across the range 430-475 nm correlated well with available epinephrine dose (r = − 0.71). This wavelength corresponds to the blue channel of a typical smartphone camera Bayer filter. Smartphone camera images of the EAI solutions in various illumination conditions were analyzed to assign color indices representing the degree of discoloration. Color index of the samples showed similar correlation (|r| > 0.7) with available epinephrine dose as that of visible spectrophotometry. Smartphone imaging colorimetry is proposed as a potential point-of-use epinephrine dose estimator for expired and degraded EAIs.

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“…Com os mesmos procedimentos apresentados na seção 3.1, demonstra-se o queé um espectro contínuo, pela obtenção do espectro unidimensional da luz proveniente apenas da vela, através da ferramenta "projection", destacando o comportamento suave da curva resultante, sem variações bruscas no fluxo luminoso (Figura 8(a)). A pequena elevação entre o verde o amarelo permite discutir interdisciplinarmente questões de Engenharia e Biologia, pois corresponde a uma solução aplicada para a sensibilidade da câmera por meio dos filtros de Bayern [33,34], de modo a emular a sensibilidade dos cones que permitem a visão humana em cores [35].…”

Section: Espectro Contínuo E De Linha De Emissão Do Sódiounclassified

Explorando quantitativamente observações feitas com espectrógrafos caseiros por meio de recursos digitais

Santos

Scarano

2021

Rev. Bras. Ensino Fís.

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Neste trabalho expomos um método para obter calibrações em comprimento de onda de espectros para os quais não se conhece previamente as linhas espectrais, aplicando-a em uma atividade didática prática utilizando espectros obtidos de espectrógrafos caseiros. Apresentamos a configuração instrumental para obtenção simultânea dos espectros de interesse e de calibração. Com os espectros registrados aplicamos técnicas de processamento de imagens para tratar, otimizar a extrair os dados de interesse. Para o procedimento de calibração indicamos como pesquisar pelos valores padrões no banco de dados de linhas espectrais do NIST. Uma planilha eletrônica foi elaborada com o propósito de ilustrar o processo de calibração dos espectros por meio de procedimentos usando o software DS9. Demonstramos a aplicação do procedimento de calibração nos espectros unidimensional e bidimensional no caso do espectro de lâmpada de vapor de hélio, com a qual recuperamos o comprimento de onda das linhas espectrais com resíduos inferiores a 4 nm. Por fim apresentamos sugestões de algumas atividades didáticas práticas que podem ser conduzidas por meios dos procedimentos aqui expostos utilizando observações de fontes luminosas do cotidiano.

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Use of spectral characteristics of DSLR cameras with Bayer filter sensors

Cited by 13 publications

References 11 publications

Data-driven imaging of tissue inflammation using RGB-based hyperspectral reconstruction toward personal monitoring of dermatologic health

Data-driven imaging of tissue inflammation using RGB-based hyperspectral reconstruction toward personal monitoring of dermatologic health

Estimation of available epinephrine dose in expired and discolored autoinjectors via quantitative smartphone imaging

Explorando quantitativamente observações feitas com espectrógrafos caseiros por meio de recursos digitais

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