Abstract
Subsurface light transport can affect the visual appearance of materials significantly. Measuring and modeling this phenomenon is crucial for accurately reproducing colors in printing or for rendering translucent objects on displays. In this paper, we propose an apparatus to measure subsurface light transport employing a reference material to cancel out adverse signals that may bias the results. In contrast to other approaches, the setup enables improved focusing on rough surfaces (e.g. uncoated paper). We derive a measurement equation that may be used to deduce the point spread function (PSF) of subsurface light transport. Main contributions are the usage of spectrally-narrowband exchangeable LEDs allowing spectrally-resolved measurements and an approach based on quadratic programming for reconstructing PSFs in the case of isotropic light transport.
Highlights
When light falls onto a translucent material, a fraction of it penetrates into the material and exits at different locations of the material’s surface
Main contributions are the usage of spectrally-narrowband exchangeable light-emitting diode (LED) allowing spectrally-resolved measurements and an approach based on quadratic programming for reconstructing point spread function (PSF) in the case of isotropic light transport
A highly linear CCD camera with 12-bit signal depth instead of a CMOS RGB camera to increase the bit and spatial resolution of captured images. Another important contribution of this paper is a novel approach based on quadratic programming for reconstructing PSFs of isotropic light transport which is robust against noise
Summary
When light falls onto a translucent material, a fraction of it penetrates into the material and exits at different locations of the material’s surface. Modeling the intrinsic physical phenomena (especially mechanical and optical dot gain) could aid the creation of spectral halftone models with only few parameters requiring a small number of measurements for model adjustment [5]. This is crucial for the applicability of a halftone model, for printers employing many inks. A highly linear CCD camera with 12-bit signal depth instead of a CMOS RGB camera (only green pixels were used) to increase the bit and spatial resolution of captured images Another important contribution of this paper is a novel approach based on quadratic programming for reconstructing PSFs of isotropic light transport which is robust against noise
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