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Publications

O. Burggraaff, N. Schmidt, J. Zamorano, K. Pauly, S. Pascual, C. Tapia, E. Spyrakos, and F. Snik, "Standardized spectral and radiometric calibration of consumer cameras," Opt. Express  27, 19075-19101 (2019). 

Abstract
Consumer cameras, particularly onboard smartphones and UAVs, are now commonly used as scientific instruments. However, their data processing pipelines are not optimized for quantitative radiometry and their calibration is more complex than that of scientific cameras. The lack of a standardized calibration methodology limits the interoperability between devices and, in the ever-changing market, ultimately the lifespan of projects using them. We present a standardized methodology and database (SPECTACLE) for spectral and radiometric calibrations of consumer cameras, including linearity, bias variations, read-out noise, dark current, ISO speed and gain, flat-field, and RGB spectral response. This includes golden standard ground-truth methods and do-it-yourself methods suitable for non-experts. Applying this methodology to seven popular cameras, we found high linearity in RAW but not JPEG data, inter-pixel gain variations >400% correlated with large-scale bias and read-out noise patterns, non-trivial ISO speed normalization functions, flat-field correction factors varying by up to 2.79 over the field of view, and both similarities and differences in spectral response. Moreover, these results differed wildly between camera models, highlighting the importance of standardization and a centralized database.

 


 


Book chapter

Ceccaroni, L., & Piera, J. (2018). Stakeholder engagement in water quality research: A case study based on the Citclops and MONOCLE projects. In Hecker S., Haklay M., Bowser A., Makuch Z., Vogel J., & Bonn A. (Eds.), Citizen Science: Innovation in Open Science, Society and Policy (pp. 201-209). London: UCL Press.
 

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Funding

Funded by the European Union


This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 776480.

Contact

Stefan Simis
Principal Investigator
stsiNOSPAM@pml.ac.uk

Jess Heard
Project Manager
jesshNOSPAM@pml.ac.uk
 
Project Office
Plymouth Marine Laboratory,
Prospect Place,
Plymouth,
Devon,
UK,
PL1 3DH

+44 (0) 1752 633 100
 

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