bb_overlap

PURPOSE ^

BB_OVERLAP.m calculates Bounding box overlap

SYNOPSIS ^

function overlap = bb_overlap(bb1,bb2)

DESCRIPTION ^

 BB_OVERLAP.m calculates Bounding box overlap
 
   BB_OVERLAP is a function to calculate Bounding box overlap. Please
   note that  this function was part of the RGBD tracker code presented in
   [1] and available under under Open Source MIT License at
    http://tracking.cs.princeton.edu/code.html

   INPUT:

CROSS-REFERENCE INFORMATION ^

This function calls: This function is called by:

SUBFUNCTIONS ^

SOURCE CODE ^

0001 function overlap = bb_overlap(bb1,bb2)
0002 % BB_OVERLAP.m calculates Bounding box overlap
0003 %
0004 %   BB_OVERLAP is a function to calculate Bounding box overlap. Please
0005 %   note that  this function was part of the RGBD tracker code presented in
0006 %   [1] and available under under Open Source MIT License at
0007 %    http://tracking.cs.princeton.edu/code.html
0008 %
0009 %   INPUT:
0010 
0011 %   - bb1 and bb2 bounding boxes in the format [topLeftX, topLeftY,
0012 %   bottomRightX, bottomRightY] read as [columnIndexTopLeft, rowIndexTopLeft,
0013 %   columnIndexBottomRight, rowIndexBottomRight]
0014 %
0015 %   -overlap estimated overlap
0016 %
0017 %  See also OCCLUDINGOBJECTSEGDSKCF
0018 %
0019 %  [1] Shuran Song and Jianxiong Xiao. Tracking Revisited using RGBD
0020 %  Camera: Baseline and Benchmark. 2013.
0021 %
0022     overlap = zeros(1,size(bb2,2));
0023     
0024     if isempty(bb1), return; end;
0025     
0026     for i=1:size(bb2,2),
0027         overlap(i) = overlapSingle(bb1,bb2(:,i));
0028     end
0029 end
0030 
0031 function out= overlapSingle(bb1,bb2)
0032     if bb1(1) > bb2(3),out =0 ;return ;end
0033     if (bb1(2) > bb2(4)),out =0 ; return ; end
0034     if (bb1(3) < bb2(1)),out =0 ;return ; end
0035     if (bb1(4) < bb2(2)),out =0 ;return ; end
0036 
0037     b=min(bb1(3:4),bb2(3:4))-max(bb1(1:2),bb2(1:2));
0038     b(b<0)=0;
0039     intersection =b(1).*b(2);
0040     area1=(bb1(3)-bb1(1))*(bb1(4)-bb1(2));
0041     area2=(bb2(3)-bb2(1))*(bb2(4)-bb2(2));
0042     out = intersection/(area1 + area2 - intersection);
0043 end

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