Hyperspectral imaging in different light conditions

Abstract

The aim of this paper is to investigate the influence of the illumination conditions on the hyperspectral image quality, especially saturation, shadow and dark current noise effects. The study was performed on a salt sample using one and two light sources. The results emphasised that at high light intensity an increased image brightness was noticed leading to a loss of information. On the other hand at low light intensity the dark current noise introduces peaks on the entire spectral range that disturb the data. The shadow effect seen in each image can be avoided only by a uniform illumination. In conclusion, the hyperspectral image quality depends strongly on the lighting conditions, a good image quality being achieved only if the light intensity is perfectly balanced.

Keywords:

• Hyperspectral imaging
• Illuminating conditions
• Shadow effect
• Saturation effect
• Dark current noise

Acknowledgements

This work was supported by the Romanian Ministry of National Education (grant no. PN II PCCA 184/2012).