Abstract
Stimulation elicited by a real world field of view is related to the color, the intensity and the direction of the information reaching the eye: different spectral power distributions of light trigger different responses. An evaluation of the stimulation provided by the field of view can be performed by measuring the spectral radiance with a spectroradiometer and weighting this data with an efficiency curve. Different weights (physical, physiological and psychological) can lead to different analyses and consequently to different results. The proposed method allows an overall and simplified evaluation of the field of view based on spectral and luminance measures and a script that processes the luminous information. The final aim of this approach is to provide further information about the light stimulation reaching the retina and to supply a qualitative evaluation of the field of view, allowing to know how much stimulation is coming from a certain area within the visual field depending on the type of surface, basing on spectral and directional information. This approach can have practical implications, allowing technicians and designers to take into consideration the possible visual fields, in order to properly shape the features of stimulation throughout the day, hence following a field of view-based dynamic design.
Highlights
The artificial lighting of modern offices, where workers spend most of their day, provide a completely different radiometric and photometric information respect to natural daylight in terms of intensity, spectrum, illuminance and luminance levels, distribution within the visual field, time and prior history of exposition [1,2,3,4]
Human vision has been studied for centuries, leading to a deepened knowledge of the long-known human light receptors, cones and rods: the first ones work under quite high illuminance levels, allowing diurnal vision, codified by the Photopic Efficiency Function V(λ) [13,14,15], the second ones work at low illuminance levels, allowing night vision [16,17,18], codified by the Scotopic Efficiency Function [19]
A script was written, for associating the pixels of the image, considered as an n × m matrix, to their relative values of spectral reflectance and luminance; it can be run by using spectral radiometric data from performed measurements, data coming from open databases of spectral reflectance and the luminance image
Summary
The artificial lighting of modern offices, where workers spend most of their day, provide a completely different radiometric and photometric information respect to natural daylight in terms of intensity, spectrum, illuminance and luminance levels, distribution within the visual field, time and prior history of exposition [1,2,3,4]. Such exposition somehow influences our body rhythms, psychological responses and performances [5,6,7,8,9], namely known as non-visual effects of light. Human vision has been studied for centuries, leading to a deepened knowledge of the long-known human light receptors, cones and rods: the first ones work under quite high illuminance levels, allowing diurnal vision, codified by the Photopic Efficiency Function V(λ) [13,14,15], the second ones work at low illuminance levels, allowing night vision [16,17,18], codified by the Scotopic Efficiency Function [19]
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