【VLFeat】library

VLFeat library (http://www.vlfeat.org)

VLFeat is an open-source software written in C with interface to Matlab for ease of use and experimentation.

The library implements many common computer vision algorithms including SIFT, MSER and k-means.

startup executes commands of your choosing when the MATLAB program starts.

Create a startup.m file in your MATLAB startup folder and put in the file any commands you want executed at MATLAB startup. For example, your startup.m file might include physical constants, defaults for Handle Graphics properties, engineering conversion factors, or anything else you want predefined in your workspace.

To use and interface VLFeat with Matlab,

1. From MATLAB prompt enter (one session)

>> run('VLFEATROOT/toolbox/vl_setup')

2. Permanent setup:add this line to your startup.m file:

run('<path_to_your_VLFeat_Library>/toolbox/vl_setup')

[f,d] = vl_sift(im2single(im), ...
'firstoctave', -1, ...
'peakthresh', .01, ...
'edgethresh', 10, ...
'windowsize', 2, ...
'verbose') ;

kdtree=vl_kdtreebuild(single(d));
N = numel(d);
DescriptorKDTrees = cell(N, 1);
for i = 1 : N
des = d{i};
% kdtree = vl_kdtreebuild(single(des), 'NumTrees', 10) ;
kdtree = vl_kdtreebuild(single(des)) ;
    DescriptorKDTrees {i} = kdtree;
end

SIFT在尺度和旋转变换的情况下效果最好,SURF在亮度变化下匹配效果最好,在模糊方面优于SIFT,而尺度和旋转的变化不及SIFT,旋转不变上比SIFT差很多。速度上看,SURF是SIFT速度的3倍。

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