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mc2frontal.m ( File view )

From:mocaptoolbox
  • By mountain 2013-11-27
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			function d2 = mc2frontal(d, m1, m2, method)
% Rotates motion-capture data to have a frontal view with respect to a pair of markers.
%
% syntax
% d2 = mc2frontal(d, m1, m2);
% d2 = mc2frontal(d, m1, m2, method);
%
% input parameters
% d: MoCap data structure or data matrix
% m1, m2: numbers of the markers that define the frontal plane
% method: rotation method, possible values:
%   'mean' (default) rotates data in all frames with the same angle to have
%       frontal view with respect to the mean locations of markers m1 and m2
%   'frame' rotates each frame separately to have a frontal view with
%       respect to the instantaneous locations of markers m1 and m2; with this
%       value, each individual frame is centered as well
%
% output
% d2: MoCap data structure or data matrix
%
% examples
% d2 = mc2frontal(d, 3, 7);
% d2 = mc2frontal(d, 3, 7, 'frame');
%
% comments
% The frontal plane is defined by the temporal mean of markers m1 and m2.
% See manual / function reference for visual example.
%
% see also
% mcrotate
%
%  Part of the Motion Capture Toolbox, Copyright 2008,
% University of Jyvaskyla, Finland

if nargin<4 
    method = 'mean'; 
end
d2=d;
if isfield(d,'type') && strcmp(d.type, 'MoCap data')
    dat = d.data;
else
    dat = d;
end

if strcmp(method, 'mean')
    tmp = dat(:,[3*m1+(-2:0) 3*m2+(-2:0)]);
    x1 = mcmean(tmp(:,1));
    y1 = mcmean(tmp(:,2));
    x2 = mcmean(tmp(:,4));
    y2 = mcmean(tmp(:,5));
    [th,r] = cart2pol(x1-x2,y1-y2);
    dat2 = mcrotate(dat, 180-180*th/pi, [0 0 1]);
elseif strcmp(method, 'frame')
    dat2 = zeros(size(dat));
    for k=1:size(dat,1)
        tmp = dat(k,[3*m1+(-2:0) 3*m2+(-2:0)]);
        x1 = tmp(:,1);
        y1 = tmp(:,2);
        x2 = tmp(:,4);
        y2 = tmp(:,5);
        [th,r] = cart2pol(x1-x2,y1-y2);
        %dat2(k,:) = mccenter(mcrotate(dat(k,:), -180*th/pi, [0 0 1]));
        dat2(k,:) = mcrotate(dat(k,:), 180-180*th/pi, [0 0 1],[0.5*(x1+x2) 0.5*(y1+y2) 0]);
    end
end

if isfield(d,'type') && strcmp(d.type, 'MoCap data')
    d2.data = dat2;
else
    d2 = dat2;
end
			
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License.txt15.84 kB2013-02-12 03:05
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