Illumination discrimination in real and simulated scenes

Supplemental Material

Ana Radonjić, Bradley Pearce, Stacey Aston, Avery Krieger, Hilary Dubin, Nicolas P. Cottaris, David H. Brainard and Anya C. Hurlbert

Instructions
Real scene condition (Experiment 1): pdf
Simulated scene conditions (except 2D condition of Experiment S1): pdf
Simulated scene 2D condition (Experiment S1): pdf

Comparison illumination tables.
Tables specifying the difference between the target and comparison illuminations in ΔE L*u*v* units are provided as tab delimited text. In producing the tables, target illuminant CIEXYZ coordinates are used as the reference white point (for illuminant spectra to XYZ to L*u*v* conversion). Different tables are used for the real and simulated scenes.
Real scene condition (txt)
Simulated scene conditions (txt)

Real scene condition

Light module spectra. Normalized spectral power distribution for each of the 13 unique LED channels as tab delimited text (txt).
1st column shows wavelength in nm (380 - 780 nm, 1 nm step); for the remaining columns, header labels indicate different channels.

Illuminants. Spectral power distribution for the target and comparison illuminants as tab delimited text (grouped by illuminant). Files are grouped by illuminant. Target illuminant is denoted as 'blue0'. 1st column shows wavelength in nm (380 - 780 nm, 4 nm steps). For the remaining columns, header labels correspond to comparison illuminant spectra with numbers denoting the nominal comparison illuminant step (difference relative to the target).
Blue Yellow Green Red
Note: Only test illuminants labeled 0-49 (in each illumination direction) were used in the real scene condition.
Simulated scene condition

Stimulus geometry. Blender file specifying the position of each element in the stimulus is available here (Blender is required to view this file).
Render toolbox mapping files which are used for rendering and include specification of surface reflectance assigned to each surface in the scene are provided for each conditions as tab delimited text:
Neutral scene (txt)
Reddish-blue scene (txt)
Yellowish-green scene (txt)
Experiment S1 (txt)
Illuminants. Spectral power distribution for the target and comparison illuminants as tab delimited text (grouped by illuminant). Files are grouped by illuminant. Target illuminant is denoted as 'blue0'. 1st column shows wavelength in nm (380 - 780 nm, 4 nm steps); different spectral sampling was used for rendering  (400 - 700 nm, 10 nm steps).For the remaining columns, header labels correspond to comparison illuminant spectra with numbers denoting the nominal comparison illuminant step (difference relative to the target).
Blue Yellow Green Red
Note: Only test illuminants labeled 1-50 (in each illumination direction) were used in the simulated scene condition.
Surfaces.
Simulated surface reflectance functions as tab delimited text.
Table format: 1st column: wavelength in nm (400 - 780 nm, 4 nm steps); different spectral sampling was used for rendering  (400 - 700 nm, 10 nm steps).
For the remaining columns, header labels correspond to surface reflectance labels specified in the mapping files.
Experiment 1 and 2 (txt)
Experiment S1(txt)
Correction: On page 5 and 6 of the manuscript (last paragraph) we state that we used 16 different surface reflectance functions in Experiment 1 (simulated scene condition). This is a typo. 18 different surfaces were used. The indices corresponding to the labels of surfaces we used (provided in the .txt file) are: [1, 3, 6, 7, 10, 12, 13, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25]. The same 18 surface reflectances were used in Experiment 2.

Individual subject data

The tables below provide individual subject data for each experiment and condition as tab delimited text.
Each row corresponds to one subject (subject numbers are assigned arbitrarily) and shows measured thresholds for each illuminant direction for each block of trials (as indicated by the header labels). Thesholds that fall outside of the stimulus range are denoted as NaN (these subjects, as noted explicitely below, are exluded from the analysis).

Experiment 1 and S2: Real scene, Simulated (indended depth) scene, Simulated (reduced depth) scene (Experiment S2).
(note: subject #10 in the simulated scene conditions is excluded from the analysis).

Experiment 2: Neutral scene, Reddish-blue scene,Yellowish-green scene

Experiment S1: HLS, LLS, 2D.
(note: subjects #9 and #10 in the LLS condition are excluded from the analysis).