Nixon, M;
Outlaw, F;
MacDonald, LW;
Leung, TS;
(2019)
The importance of a device specific calibration for smartphone colorimetry.
In:
27th Color and Imaging Conference Final Program and Proceedings.
(pp. pp. 49-54).
Society for Imaging Science and Technology: Paris, France.
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Abstract
In order for a smartphone-based colorimetry system to be generalizable, it must be possible to account for results from multiple phones. A move from device-specific space to a device independent space such as XYZ space allows results to be compared, and means that the link between XYZ values and the physical parameter of interest needs only be determined once. We compare mapping approaches based on calibration data provided in image metadata, including the widely used open-source software dcraw, to a separate calibration carried out using a colorcard. The current version of dcraw is found to behave suboptimally with smartphones and should be used with care for mapping to XYZ. Other metadata approaches perform better, however the colorcard approach provides the best results. Several phones of the same model are compared and using an xy distance metric it is found that a device-specific calibration is required to maintain the desired precision.
| Type: | Proceedings paper |
|---|---|
| Title: | The importance of a device specific calibration for smartphone colorimetry |
| Event: | 27th Color and Imaging Conference (CIC27) |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.2352/issn.2169-2629.2019.27.10 |
| Publisher version: | https://doi.org/10.2352/issn.2169-2629.2019.27.10 |
| Language: | English |
| Additional information: | Reprinted with permission of IS&T: The Society for Imaging Science and Technology sole copyright owners of, "CIC27: Twenty-seventh Color and Imaging Conference 2019", |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10086021 |
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