Application of High-Dynamic Range Imaging Techniques in Architecture: A Step toward High-Quality Daylit Interiors?

Abstract

High dynamic range (HDR) imaging techniques are nowadays widely used in building research to capture luminances in the occupant field of view and investigate visual discomfort. This photographic technique also makes it possible to map sky luminances. Such images can be used for illuminating virtual scenes; the technique is called image-based lighting (IBL). This paper presents a work investigating IBL in a lighting quality research context for accelerating the development of appearance-driven performance indicators. Simulations were carried out using Radiance software. The ability of IBL to accurately predict indoor luminances is discussed by comparison with luminances from HDR photographs and luminances predicted by simulation in modeling the sky in several other more traditional ways. The present study confirms previous observations that IBL leads to similar luminance values than far less laborious simulations in which the sky is modeled based on outdoor illuminance measurements. IBL and these last methods minimize differences with HDR photographs in comparison to sky modeling not based on outdoor measurements.

Cloud Observation and Cloud Cover Calculation at Nighttime Using the Automatic Cloud Observation System (ACOS) Package

“…Therefore, in this study, the brightness of the R channel was adjusted for all pixels (a value of 25 was chosen to be ideal). Then, different RBR thresholds were set depending on the luminance (Y) characteristics of the image [41,42]. The adjusted R brightness of 25 is the average brightness within 10 • of the center of the image of the clearest sky (the average RGB brightness in the image was the smallest; 0300 UTC on January 3, 2019).…”

Investigating the Luminance Performance Gap of Environmental Simulation and High Dynamic Range Imaging

“…Studies have validated the use of HDRI in building daylighting studies as it utilizes luminance information comparable to a luminance meter [11], [12]. Its original use regarding daylighting studies was a luminance acquisition tool but has seen significant growth to include glare analysis [13], [14], image-based imaging [15]- [17],…”

Utilizing a Terrestrial Laser Scanner for 3D Luminance Measurement of Indoor Environments

“…In HDR imaging, a set of images with different exposure times is combined to extend the dynamic range of a single exposure. This technique has been applied in architecture [ 22 ]. Moreover, the HDR technique is under constant development, for example by being applied to 360 imaging [ 23 ] and by improved image fusion algorithms [ 24 ].…”