MARDALJEVIC, J., PAINTER, B. and ANDERSEN, M., 2009. Transmission illuminance proxy HDR imaging: a new technique to quantify luminous flux. Lighting Research and Technology, 41 (1), pp.27-46.
A technique to measure arbitrarily complex luminous fluxes across large areas is presented. The technique is founded on high-dynamic range (HDR) imaging technology and can be achieved using a standard consumer digital camera and everyday materials such as printer-grade white paper. The same approach can also be used to determine the direct and diffuse components of illuminance. The technique has been named transmission illuminance proxy - high dynamic range imaging or TIP-HDRI.