/usr/share/psychtoolbox-3/PsychRadiometric/PsychAnsiZ136MPE/AnsiZ136MPEComputeCe.m is in psychtoolbox-3-common 3.0.11.20140816.dfsg1-1.
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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 | function Ce = AnsiZ136MPEComputeCe(stimulusSizeDeg)
% Ce = AnsiZ136MPEComputeCe(stimulusSizeDeg)
%
% ****************************************************************************
% IMPORTANT: Before using the AnsiZ136 routines, please see the notes on usage
% and responsibility in PsychAnsiZ136MPE/Contents.m (type "help PsychAnsiZ136MPE"
% at the Matlab prompt.
% ****************************************************************************
%
% Compute constant Ce, ANSI Z136.1-2007, Table 6, p. 76.
%
% This is only defined between 400 and 1400 nm.
%
% 2/20/13 dhb Wrote it.
%% Implement formula. Factor only defined between 400 and 600 nm
stimulusSizeMrad = DegToMrad(stimulusSizeDeg);
if (stimulusSizeMrad < 1.5)
Ce = 1;
elseif (stimulusSizeMrad > 100)
Ce = (stimulusSizeMrad^2)/(1.5*100);
else
Ce = stimulusSizeMrad/1.5;
end
end
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