Transmission illuminance proxy HDR imaging: A new technique to quantify luminous flux
John Mardaljevic, B. Painter, M. Andersen · Lighting Research & Technology · 2009
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.