Cehao Yu
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View article: Contributed talks II: Characterizing terrestrial illumination: Spectral, angular, spatial, and temporal variability
Contributed talks II: Characterizing terrestrial illumination: Spectral, angular, spatial, and temporal variability Open
Terrestrial illumination undergoes continuous spectral, angular, spatial, and temporal changes throughout the day, influenced by diurnal cycles and atmospheric conditions such as haze. These variations in light exposure impact human physio…
View article: Time-of-day perception in paintings
Time-of-day perception in paintings Open
The spectral shape, irradiance, direction, and diffuseness of daylight vary regularly throughout the day. The variations in illumination and their effect on the light reflected from objects may in turn provide visual information as to the …
View article: Time of day perception in paintings
Time of day perception in paintings Open
The spectral shape, irradiance, direction, and diffuseness of daylight vary regularly throughout the day. The variations in illumination and their effect on the light reflected from objects may in turn provide visual information as to the …
View article: Quantifying the spatial, temporal, angular and spectral structure of effective daylight in perceptually meaningful ways
Quantifying the spatial, temporal, angular and spectral structure of effective daylight in perceptually meaningful ways Open
We present a method to capture the 7-dimensional light field structure, and translate it into perceptually-relevant information. Our spectral cubic illumination method quantifies objective correlates of perceptually relevant diffuse and di…
View article: Quantifying spatial, temporal, angular and spectral structure of effective daylight in perceptually meaningful ways
Quantifying spatial, temporal, angular and spectral structure of effective daylight in perceptually meaningful ways Open
We present a method to capture the 7-dimensional light field structure, and translate it into perceptually-relevant information. Our spectral cubic illumination method quantifies objective correlates of perceptually relevant diffuse and di…
View article: Quantifying spatial, temporal, angular and spectral structure of effective daylight in perceptually meaningful ways
Quantifying spatial, temporal, angular and spectral structure of effective daylight in perceptually meaningful ways Open
We present a method to capture the 7-dimensional light field structure, and translate it into perceptually-relevant information. Our spectral cubic illumination method quantifies objective correlates of perceptually relevant diffuse and di…
View article: Spatial and temporal dynamics of effective daylight in natural scenes
Spatial and temporal dynamics of effective daylight in natural scenes Open
In vision science, it is presumed that daylight priors affect color, shape, and light perception. Earth-Sun geometry, weather, climate, and optical effects such as Rayleigh scattering cause daylighting variations in time, direction, and sp…
View article: Quantifying spatial, temporal, angular and spectral structure of effective daylight in perceptually meaningful ways
Quantifying spatial, temporal, angular and spectral structure of effective daylight in perceptually meaningful ways Open
We present a method to capture the 7-dimensional light field structure, and translate it into perceptually-relevant information. Our spectral cubic illumination method quantifies objective correlates of perceptually relevant diffuse and di…
View article: Spectral dataset of natural light fields measured in the Netherlands
Spectral dataset of natural light fields measured in the Netherlands Open
This is a spectral dataset of natural light collected in the Netherlands. The data supplement contains the rural and city cubic irradiance spectra with associated wavelength spacing. We measured natural light fields for sunny weather in th…
View article: Spectral dataset of natural light fields measured in the Netherlands
Spectral dataset of natural light fields measured in the Netherlands Open
This is a spectral dataset of natural light collected in the Netherlands. The data supplement contains the rural and city cubic irradiance spectra with associated wavelength spacing. We measured natural light fields for sunny weather in th…
View article: Effects of inter-reflections on the correlated colour temperature and colour rendition of the light field
Effects of inter-reflections on the correlated colour temperature and colour rendition of the light field Open
In everyday scenes, the effective light (the actual light in a space) can be defined as a complex light field, resulting from a mixture of emissive light sources and indirect mutual surface (inter-)reflections. Hence, the light field typic…
View article: Effects of inter-reflections on the chromatic structure of the light field
Effects of inter-reflections on the chromatic structure of the light field Open
Chromatic properties of the effective light in a space are hard to predict, measure and visualise. This is due to complex interactions between materials and illuminants. Here, we describe, measure and visualise the effects of inter-reflect…
View article: Contributed Session III: Disentangling object color from illuminant color: The role of color shifts
Contributed Session III: Disentangling object color from illuminant color: The role of color shifts Open
Research has shown that disentangling surface and illuminant colors was possible based on various scene statistics. This study investigates the statistical cues induced by the chromatic effects of interreflections. We present a numerical a…
View article: Effects of inter-reflections in box spaces on perceived object color harmony and shape
Effects of inter-reflections in box spaces on perceived object color harmony and shape Open
The effective illumination incident on an object in a three-dimensional scene is a geometrically-weighted sum of direct and indirect light. The luminous and chromatic properties of the light field vary spatially and directionally, inducing…
View article: The influence of material colors on the <italic>effective color rendering and temperature</italic> through mutual illumination
The influence of material colors on the effective color rendering and temperature through mutual illumination Open
In complex scenes, the light reflected by surfaces causes secondary illumination, which contributes significantly to the actual light in the space (the "light field"). Secondary illumination is dependent on the primary illumination, geomet…