Exploring the Influence of Light Sources on Digital Camera-based Spectral Reflectance Reconstruction

Abstract

Light source is an important factor in digital camera-based spectral reconstruction since it influence the camera responses of the object. In this paper, we explored the influence of light sources on spectral reconstruction from several aspects. Firstly, we tested the influence of correlated color temperature (CCT) of simulated daylight sources on spectral reconstruction. Then, the influence of light sources with same CCT but different spectral power distribution (SPD) on the spectral reconstruction was explored. After that, the influence of light sources with special shape of SPDs on spectral reconstruction was tested. Results indicated that the CCT can be used to describe the performance of the daylight source in spectral reconstruction, but can not be used to describe the other non-daylight sources, the red component in visible spectrum is important for higher spectral reconstruction accuracy. Four feature metrics of SPDs are proposed to evaluate the performance of light sources in spectral reconstruction. Further tests showed that the higher the metrics score the better the spectral reconstruction accuracy.