Photometric and Colorimeric Comparison of HDR and Spctrally Resolved Rendering Images

In this paper, we will demonstrate a comparison between measured colorimetric images, and simulated images from a physics based rendering engine. The colorimetric images are high dynamic range (HDR) and taken with a luminance and colour camera mounted on a goniometer. For the comparison, we have used a scene similar to the cornel box (CUPCG, 1998) but with a spectrally controllable LED light source, neutral grey walls and a colour checker board for colorimetric assessments. The luminance value and colour information of the HDR camera and rendering images are used for the comparison. The spectral irradiances of the light source were measured for two lighting scenarios: low and high correlated colour temperature (CCT) white lighting conditions for the modelling of the light source. Based on these measurements, we have conducted spectrally resolved renderings with a spectral renderer, Ocean. The colour differences between the camera and rendered images were calculated with the most recent CIE metric, CIEDE2000 (CIE, 2012). Our simulations have demonstrated interesting results, which confirm
the accuracy of the Ocean engine. In the future, we want to consider non-Lambertian surfaces.