The features considered in VQM are extracted from the spatial gradients of the luminance and chrominance components and from measuring contrast and temporal information extracted from the luminance component only.
In ILP procedure, one has to divide the eye area into five intervals, 30 columns each, to execute the project of luminance gradient value within each range according to the following equation: textrm{ILP} y)=sumlimits_{KZ_{y}-1.5*Iris_r}^{KZ_{y}}|I_{text{lum}}(S_{i}+x)(y -I_{text{lum}}(S_{i}+x+1)(y -I_{text{lum}
Here, I show how the perception of luminosity can emerge from a previously proposed neuronal architecture for generating representations of luminance gradients.
Thus, bars and edges might arise from peaks of luminance and luminance gradient respectively, or bars and edges might be found at peaks of local energy, where local phases are aligned across spatial frequency.
These shifts were well predicted by the location of luminance peaks (bars) and gradient peaks (edges), but not by energy peaks which (by design) predicted no shift at all.
Moreover, the luminance distribution would split up all chromaticity bases down into certain subbases for better representing the degree of luminosity gradient of our chromaticity bases.
Since D s) approximates the directional derivative of the luminance signal along the gradient direction [10], the relationship D s) = 0 is equivalent to find the flex points of luminance transitions.
Inappropriate spatial distribution of luminance.
The use of luminance images brings us multiple benefits.
The PLEDs have a feature of luminance characteristics.
The luminance values inside the oval mask were normalized for each face such that mean luminance was equal to half maximum luminance (i.e., 35 cd/m2), and the root-mean-squared (rms) contrast (defined as the standard deviation of luminance divided by mean luminance) was set to 1. Luminance outside the oval mask was set to half the maximum luminance.
