PT Unknown
AU Rahat Khan
   Joost Van de Weijer
   Dimosthenis Karatzas
   Damien Muselet
TI Towards multispectral data acquisition with hand-held devices
BT 20th IEEE International Conference on Image Processing
PY 2013
BP 2053
EP 2057
DI 10.1109/ICIP.2013.6738423
DE Multispectral; mobile devices; color measurements
AB We propose a method to acquire multispectral data with handheld devices with front-mounted RGB cameras. We propose to use the display of the device as an illuminant while the camera captures images illuminated by the red, green andblue primaries of the display. Three illuminants and three response functions of the camera lead to nine response values which are used for reflectance estimation. Results are promising and show that the accuracy of the spectral reconstruction improves in the range from 30-40% over the spectralreconstruction based on a single illuminant. Furthermore, we propose to compute sensor-illuminant aware linear basis by discarding the part of the reflectances that falls in the sensorilluminant null-space. We show experimentally that optimizing reflectance estimation on these new basis functions decreasesthe RMSE significantly over basis functions that are independent to sensor-illuminant. We conclude that, multispectral data acquisition is potentially possible with consumer hand-held devices such as tablets, mobiles, and laptops, opening up applications which are currently considered to be unrealistic.
ER