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leadidcodexyz.m
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leadidcodexyz.m
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function [HDR] = leadidcodexyz(arg1)
% LeadIdCodeXYZ uses the Label information for computing the
% LeadIdCode and the XYZ position of the EEG Electrodes
% according to Annex A of FEF Vital Signs Format [1]
%
% HDR = leadidcodexyz(HDR);
% adds HDR.LeadIdCode and HDR.ELEC.XYZ, if needed.
%
% see also: SLOAD, SOPEN, PHYSICALUNITS, doc/leadidtable_scpecg.txt, doc/elecpos.txt
%
% Reference(s):
% [1] CEN/TC251/PT40 (2001)
% File Exchange Format for Vital Signs - Annex A
%
% Birbaumer, N. (2006). Brain-computer-interface research: Coming of age. Clinical Neurophysiology, 117:479–83.
% http://www.acns.org/pdfs/ACFDD46.pdf.
% ACNS (2006). Guidelines for standard electrode position nomenclature. American Clinical
% Neurophysiology Society. http://www.acns.org/pdfs/ACFDD46.pdf.
%
% This program is free software; you can redistribute it and/or
% modify it under the terms of the GNU General Public License
% as published by the Free Software Foundation; either version 3
% of the License, or (at your option) any later version.
% Copyright (C) 2006-2009,2020 by Alois Schloegl <alois.schloegl@gmail.com>
% This is part of the BIOSIG-toolbox https://biosig.sourceforge.io/
global BIOSIG_GLOBAL;
% BIOSIG_GLOBAL=[]; %%% used for debugging, only.
if ~isfield(BIOSIG_GLOBAL,'Phi');
BIOSIG_GLOBAL.ISLOADED_XYZ = 0 ;
end;
if ~isfield(BIOSIG_GLOBAL,'ISLOADED_XYZ')
BIOSIG_GLOBAL.ISLOADED_XYZ = 0 ;
end;
if ~BIOSIG_GLOBAL.ISLOADED_XYZ;
f = which('getfiletype.m'); % identify path to biosig
[p,f,e] = fileparts(f);
[p,f,e] = fileparts(p);
BIOSIG_GLOBAL.ISLOADED_XYZ = 0 ;
N = 0;
% fid = fopen(fullfile(p,f,'leadidtable_scpecg.txt'),'r');
% s = char(fread(fid,[1,inf],'uint8'));
% fclose(fid);
% Preloaded the file into a .mat file to avoid dealing with issues
% when loading via compiled Mac version
load('leadidtable_scpecg.mat')
Code = repmat(NaN, 200, 1); Phi = Code; Theta = Code;
while ~isempty(s),
[t,s] = strtok(s,[10,13,0]);
if ~length(t)
elseif ~strncmp(t,'#',1)
ix3 = strfind(t,'MDC_ECG_LEAD_');
if isempty(ix3)
ix3 = length(t)+1;
end
[t1,t2] = strtok(t(1:ix3-1),[9,32]);
[t2,t3] = strtok(t2,[9,32]);
id = str2double(t2);
N = N + 1;
Labels{N,1} = t1;
Code(N,1) = id;
Description{N,1} = deblank(t3);
%MDC_ECG_LEAD{N,1} = t(ix3+13:end)
MDC_ECG_LEAD{N,1} = t(ix3:end);
end;
end;
N1 = N;
% load table
% fid = fopen(fullfile(p,f,'elecpos.txt'),'r');
% t = char(fread(fid,[1,inf],'uint8'));
% fclose(fid);
% Preloaded the file into a .mat file to avoid dealing with issues
% when loading via compiled Mac version
load('elecpos.mat')
% extract table information
while ~isempty(t)
[x,t] = strtok(t,[10,13,0]);
if isempty(x)
elseif strncmp(x,'#',1)
else
N = N + 1;
[num,status,strarray] = biosig_str2double(x);
Code(N,1) = num(1);
Labels{N,1} = upper(strarray{2});
Phi(N,1) = num(3);
Theta(N,1) = num(4);
end;
end;
Phi = Phi(:) *pi/180;
Theta = Theta(:)*pi/180;
% loading is done only once.
BIOSIG_GLOBAL.XYZ = [sin(Theta).*cos(Phi), sin(Theta).*sin(Phi), cos(Theta)];
BIOSIG_GLOBAL.Phi = Phi*180/pi;
BIOSIG_GLOBAL.Theta = Theta*180/pi;
BIOSIG_GLOBAL.LeadIdCode = Code;
BIOSIG_GLOBAL.Label = Labels;
BIOSIG_GLOBAL.Description = Description;
BIOSIG_GLOBAL.MDC_ECG_LEAD = MDC_ECG_LEAD;
BIOSIG_GLOBAL.ISLOADED_XYZ = 1;
end;
if nargin<1,
HDR.LeadIdCode = BIOSIG_GLOBAL.LeadIdCode;
HDR.Label = BIOSIG_GLOBAL.Label;
HDR.ELEC.XYZ = BIOSIG_GLOBAL.XYZ;
HDR.TYPE = 'ELPOS';
else % electrode code and position
if isstruct(arg1)
HDR = arg1;
elseif isnumeric(arg1),
HDR.LeadIdCode = arg1;
else
HDR.Label = arg1;
end;
tmp.flag1 = isfield(HDR,'ELEC');
if tmp.flag1,
tmp.flag1 = isfield(HDR.ELEC,'XYZ');
end;
if tmp.flag1,
tmp.flag1 = any(HDR.ELEC.XYZ(:));
end;
tmp.flag2 = isfield(HDR,'LeadIdCode');
tmp.flag3 = isfield(HDR,'Label');
if (~tmp.flag1 || ~tmp.flag2 || ~tmp.flag3),
if 0,
elseif tmp.flag3,
if ischar(HDR.Label)
HDR.Label = cellstr(HDR.Label);
end;
NS = length(HDR.Label);
elseif tmp.flag2,
NS = length(HDR.LeadIdCode);
elseif isfield(HDR,'NS')
NS = HDR.NS;
HDR.LeadIdCode = zeros(1,HDR.NS);
end;
if tmp.flag3,
if ~tmp.flag1,
HDR.ELEC.XYZ = repmat(NaN,NS,3);
HDR.ELEC.Phi = repmat(NaN,NS,1);
HDR.ELEC.Theta = repmat(NaN,NS,1);
end;
if ~tmp.flag2,
HDR.LeadIdCode = repmat(NaN,NS,1);
end;
for k = 1:NS;
Label = upper(deblank(HDR.Label{k}));
pos = find(Label==':');
if ~isempty(pos)
Label = Label(pos+1:end);
end;
ix = strmatch(Label,BIOSIG_GLOBAL.Label,'exact');
if length(ix)==2,
%%%%% THIS IS A HACK %%%%%
%% solve ambiguity for 'A1','A2'; could be EEG or ECG
if sum(HDR.LeadIdCode(1:k)>=996)>sum(HDR.LeadIdCode(1:k)<996)
%% majority are EEG electrodes,
ix = ix(find(BIOSIG_GLOBAL.LeadIdCode(ix)>996));
else
%% majority are ECG electrodes,
ix = ix(find(BIOSIG_GLOBAL.LeadIdCode(ix)<996));
end;
elseif isempty(ix)
ix = strmatch(deblank(HDR.Label{k}),BIOSIG_GLOBAL.MDC_ECG_LEAD,'exact');
end;
if (length(ix)==1),
if ~tmp.flag1,
HDR.ELEC.XYZ(k,1:3) = BIOSIG_GLOBAL.XYZ(ix,:);
HDR.ELEC.Phi(k) = BIOSIG_GLOBAL.Phi(ix);
HDR.ELEC.Theta(k) = BIOSIG_GLOBAL.Theta(ix);
end;
if ~tmp.flag2,
HDR.LeadIdCode(k,1) = BIOSIG_GLOBAL.LeadIdCode(ix);
end;
end;
end;
else
HDR.Label = cell(NS,1);
for k = 1:NS;
ix = find(BIOSIG_GLOBAL.LeadIdCode==HDR.LeadIdCode(k));
if (length(ix)>=1),
ix=ix(1); %
HDR.Label{k} = BIOSIG_GLOBAL.Label{ix};
if ~tmp.flag1,
HDR.ELEC.XYZ(k,1:3) = BIOSIG_GLOBAL.XYZ(ix,1:3);
HDR.ELEC.Phi(k,1) = BIOSIG_GLOBAL.Phi(ix);
HDR.ELEC.Theta(k,1) = BIOSIG_GLOBAL.Theta(ix);
end;
else
HDR.Label{k} = ['#',int2str(k)];
end;
end;
end;
end;
if tmp.flag3 && ~any(HDR.LeadIdCode),
for k = 1:HDR.NS;
ix = strmatch(upper(HDR.Label{k}),BIOSIG_GLOBAL.Label,'exact');
if length(ix)==1,
HDR.LeadIdCode(k) = BIOSIG_GLOBAL.LeadIdCode(ix);
end;
end;
end;
end;