/usr/share/psychtoolbox-3/PsychRadiometric/PsychAnsiZ136MPE/AnsiZ136MPEComputeCa.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 27 28 29 | function Ca = AnsiZ136MPEComputeCa(stimulusWavelengthNm)
% Ca = AnsiZ136MPEComputeCa(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 Ca, 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.
if (stimulusWavelengthNm < 400)
error('Ca not defined for wavelengths less than 400 nm');
elseif (stimulusWavelengthNm >= 400 && stimulusWavelengthNm < 700)
Ca = 1;
elseif (stimulusWavelengthNm >= 700 && stimulusWavelengthNm < 1050)
Ca = 10^(2*(stimulusWavelengthNm/1000-0.700));
elseif (stimulusWavelengthNm >= 1050 && stimulusWavelengthNm < 1400)
Ca = 5;
else
error('Ca not defined for wavelengths greater than or equal to 1400 nm');
end
end
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