HiDyn Deliverable D6 - Report describing the verified HDR measurements (including nonlinearity, internal stray-light, and lens flare) and recommended procedures to characterise sensitivities dominating HDR imaging luminance measurements, as well as guidance on the determination of the uncertainty budget.

There is a necessity for measurements of high-contrast scenes where there are very different levels of luminance simultaneously. For evaluating this kind of scene, high dynamic-range (HDR) measurements with imaging systems are required. A methodology must be established and verified to provide traceable HDR luminance measurements. A measurement model for these measurements with imaging systems is proposed and described, which allows traceability to HDR luminance measurements with imaging systems. This model includes those variables that need to be considered to properly evaluate the uncertainty of the measurement. The uncertainty is derived analytically from the measurement model for luminance measured at individual pixels, and the propagation of this uncertainty is considered when the average luminance across several pixels needs to be measured, including the correlations of the errors at different pixels and luminous sources in the scene. This analytical approach to the evaluation of uncertainty is important for understanding the impact of the different sources of uncertainties. The Monte Carlo approach, which is simpler, easier to implement, and with a lower computing cost, is also presented and discussed.