Reflectance recovery for coated printed color samples via multiangular RGB camera measurements

In several cases, the spectral properties of objects change and depend on the viewing angle. Some example of this kind of samples can be found in the printing industry where special effect coatings are used to obtain some effects on the surface of the printed media. This effect can be an additional gloss and even an effect of a color change with the viewing angle (goniochromism). To be colorimetrically characterized these samples require multiangular reflectance measurements. In this paper we represent reflectance recovery results for these coated samples using regression models and RGB measurements from multiple camera capture angles. The estimations are performed using 3-dimensional and 9-dimensional RGB data. We evaluated the differences in estimation performance for the chosen three angles by using standard color and spectral metrics and compared the recovery with 3-dimensional and 9-dimensional RGB data.