Home > src > calcAOISacDensityDist.m

calcAOISacDensityDist

PURPOSE ^

calculate target saccade density

SYNOPSIS ^

function [AOIDensity ] =calcAOISacDensityDist( sacStruct, aoiCenter, maxDist )

DESCRIPTION ^

 calculate target saccade density
 
 Syntax: AOIDensity =calcAOISacDensity( eyePos, aoiCenter, maxDist ) 
 
 Inputs:
  eyePos: vector  of complex (x+i*y) coordinates.  -1-i1  to identify
         missing data.  They are in range [ 0 ,1 ]
  aoiCenter: coordinates of AOI in image scale, returned by 'returnAOICenters.m'
  maxDist: maximum distance to a nearest AOI, anything further
   considered not part of any AOI, returned by 'returnAOICenters.m'
 
 Outputs:
  AOIDensity: vector of number of saccades to a particular AOI

CROSS-REFERENCE INFORMATION ^

This function calls: This function is called by:

SOURCE CODE ^

0001 % calculate target saccade density
0002 %
0003 % Syntax: AOIDensity =calcAOISacDensity( eyePos, aoiCenter, maxDist )
0004 %
0005 % Inputs:
0006 %  eyePos: vector  of complex (x+i*y) coordinates.  -1-i1  to identify
0007 %         missing data.  They are in range [ 0 ,1 ]
0008 %  aoiCenter: coordinates of AOI in image scale, returned by 'returnAOICenters.m'
0009 %  maxDist: maximum distance to a nearest AOI, anything further
0010 %   considered not part of any AOI, returned by 'returnAOICenters.m'
0011 %
0012 % Outputs:
0013 %  AOIDensity: vector of number of saccades to a particular AOI
0014 
0015 function [AOIDensity ] =calcAOISacDensityDist( sacStruct, aoiCenter, maxDist ) 
0016 
0017 
0018 endSacPos = sacStruct.endSacPos;
0019 
0020 %calculate AOI fixation density
0021 numAOI = size(aoiCenter,2);
0022 numSaccades = size( endSacPos,2);
0023 AOIDensity = zeros( numAOI,1);
0024 effectivNumSaccades = 0;
0025 
0026 for i1 = 1:numSaccades  
0027     dist = calc2Dist( endSacPos(:,i1), aoiCenter); % 2-norm
0028     [minDist minIdx] = min( dist);    
0029     if minDist < maxDist 
0030         effectivNumSaccades = effectivNumSaccades+1;
0031         AOIDensity(minIdx) = AOIDensity(minIdx) + 1;
0032     end       
0033 end
0034 
0035 % normalize so the sum is 1
0036 if effectivNumSaccades > 0
0037     AOIDensity = AOIDensity./sum( AOIDensity);
0038 end
0039 
0040

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