Evaluation and compensation of fluorescence for spectral imaging of art materials and historical documents

Christens-Barry, William A.; Boydston, Kenneth; Easton, Roger L.

doi:10.1117/12.839138

Cited by 1 publication

(6 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Lenses used for general photography have low transmittance in the ultraviolet region. Therefore, quartz lenses, which allow shorter wavelengths of light to pass to the sensor, are useful for capturing reflected ultraviolet illumination [23], [42], [112]. It is uncertain whether a quartz lens is required for MSI as the silicon camera sensors are less sensitive at these wavelengths [19], [20].…”

Section: Camera Lensmentioning

confidence: 99%

“…The artefact can be illuminated using narrowband LEDs ( [23], [31], [34], [45], [52], [74], [99], [100], [112]) or broadband light ( [20], [114][115]). LEDs only illuminate the object with specific wavelengths and so reduce the exposure and risk of damage compared to broadband illumination [76], [112]. Light panels typically contain 10-20 LEDs from 365 nm to 1050 nm [23], [66], [100], [112], [116].…”

Section: Lightsmentioning

confidence: 99%

“…LEDs only illuminate the object with specific wavelengths and so reduce the exposure and risk of damage compared to broadband illumination [76], [112]. Light panels typically contain 10-20 LEDs from 365 nm to 1050 nm [23], [66], [100], [112], [116]. The peak wavelength for each individual LED is sometimes specified ( [23], [99]).…”

Section: Lightsmentioning

confidence: 99%

“…Transmission imaging, where the source of illumination is beneath the artefact, has been used to successfully detect watermarks [26], [35], [36]. Diffusers attached to the light panels soften the lighting and disperse shadows, ( [35], [50], [100], [112], [113], [117]), but can also soften details and edges [80]. Information regarding the lights is often omitted [41], [48], [89].…”

Section: Lightsmentioning

confidence: 99%

“…A linear gamma correction 12 is used to ensure that the intensity values are the same in the saved file as the corresponding pixel response on the camera sensor. Dark Frame Correction (when an image is captured with the shutter closed to record any noise from the camera sensor which is then subtracted from the original to improve signal to noise ratio) is sometimes used [23], [112], [132][133][134][135].…”

Section: The Capture Processmentioning

confidence: 99%

See 4 more Smart Citations

Understanding multispectral imaging of cultural heritage: Determining best practice in MSI analysis of historical artefacts

Jones¹,

Duffy

Gibson³

et al. 2020

Journal of Cultural Heritage

View full text Add to dashboard Cite

Although multispectral imaging (MSI) of cultural heritage, such as manuscripts, documents and artwork, is becoming more popular, a variety of approaches are taken and methods are often inconsistently documented. Furthermore, no overview of the process of MSI capture and analysis with current technology has previously been published. This research was undertaken to determine current best practice in the deployment of MSI, highlighting areas that need further research, whilst providing recommendations regarding approach and documentation. An Action Research methodology was used to characterise the current pipeline, including: literature review; unstructured interviews and discussion of results with practitioners; and reflective practice whilst undertaking MSI analysis. The pipeline and recommendations from this research will improve project management by increasing clarity of published outcomes, the reusability of data, and encouraging a more open discussion of process and application within the MSI community. The importance of thorough documentation is emphasised, which will encourage sharing of best practice and results, improving community deployment of the technique. The findings encourage efficient use and reporting of MSI, aiding access to historical analysis. We hope this research will be useful to digitisation professionals, curators and conservators, allowing them to compare and contrast current practices. Highlights:• A range of approaches are undertaken for multispectral imaging of heritage.• An Action Research methodology was used to characterise the current pipeline.• A set of recommendations for best practice and documentation are provided.

show abstract