/usr/share/psychtoolbox-3/PsychRadiometric/RetIrradianceToTrolands.m is in psychtoolbox-3-common 3.0.11.20140816.dfsg1-1.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 | function [trolands] =...
RetIrradianceToTrolands(irradianceWatts, irradianceS, photopic, species, source)
% [trolands] =...
% RetIrradianceToTrolands(irradianceWatts,irradianceS,[photopic],[species],[source])
%
% Compute trolands from retinal irradiance in watts/um2-wlinterval. The answer is
% returned in trolands/wlinterval and can be summed to get trolands.
%
% See Wyszecki and Stiles, 1982, p. 103 for the conversions.
%
% Input variables: irradianceWatts - retinal irradiance in watts/um2-wlinterval.
% irradianceS - the wavelength sampling information for the relativeSpectrum.
% photopic - what kind of trolands: 'Photopic' (Default), 'JuddVos', 'Scotopic'.
% species, source - passed directly to EyeLength to determine length of eye in mm.
% These values inherit the default behaviors of EyeLength.
%
% 07/18/03 dhb Wrote it.
% 04/09/12 dhb Debug. This was apparently never quite finished.
% Improve comments.
% Fill in default values
if (nargin < 3 || isempty(photopic))
photopic = 'Photopic';
end
if (nargin < 4 || isempty(species))
species = [];
end
if (nargin < 5 || isempty(source))
source = [];
end
S = irradianceS;
% Convert spectrum to watts/deg2-wlinterval
eyeLengthMM = EyeLength(species,source);
mmPerDeg = DegreesToRetinalMM(1,eyeLengthMM);
mm2PerDeg2 = mmPerDeg^2;
irradianceMM2 = irradianceWatts*1e6;
irradianceDeg2 = irradianceMM2*mm2PerDeg2;
% Load appropriate V_lambda for phot/scot
switch (photopic)
case 'Photopic'
load T_xyz1931;
T_vLambda = SplineCmf(S_xyz1931,T_xyz1931(2,:),S);
clear T_xyz1931 S_xyz1931
magicFactor = 2.242e12;
case 'JuddVos'
load T_xyzJuddVos;
T_vLambda = SplineCmf(S_JuddVos,T_JuddVos(2,:),S);
clear T_JuddVos S_JuddVos
magicFactor = 2.242e12;
case 'Scotopic'
load T_rods;
T_vLambda = SplineCmf(S_rods,T_rods,S);
magicFactor = 5.581e12;
end
% Get trolands
trolands = T_vLambda*irradianceDeg2*magicFactor;
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