/usr/share/octave/site/m/vlfeat/toolbox/demo/vl_demo_covdet.m is in octave-vlfeat 0.9.17+dfsg0-6+b1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 | % VL_DEMO_COVDET Demo: VL_COVDET()
% --------------------------------------------------------------------
% Basics
% --------------------------------------------------------------------
im = vl_impattern('roofs1') ;
im = im(end-128:end,128:320,:) ;
figure(1) ; clf ;
image(im) ; axis image off ;
vl_demo_print('covdet_basic_image') ;
imgs = im2single(rgb2gray(im)) ;
frames = vl_covdet(imgs, 'verbose') ;
hold on ;
vl_plotframe(frames) ;
vl_demo_print('covdet_basic_frames') ;
% --------------------------------------------------------------------
% Affine adaptation
% --------------------------------------------------------------------
frames = vl_covdet(imgs, 'estimateAffineShape', true, 'verbose') ;
figure(2) ; clf ;
image(im) ; axis image off ; hold on ;
vl_plotframe(frames) ;
vl_demo_print('covdet_affine_frames',.8) ;
% --------------------------------------------------------------------
% Estimating orientations
% --------------------------------------------------------------------
frames = vl_covdet(imgs, 'estimateOrientation', true, 'verbose') ;
figure(3) ; clf ;
image(im) ; axis image off ; hold on ;
vl_plotframe(frames) ;
vl_demo_print('covdet_oriented_frames',.8) ;
% --------------------------------------------------------------------
% Extracting patches
% --------------------------------------------------------------------
[frames, patches] = vl_covdet(imgs, 'descriptor', 'patch') ;
figure(4) ; clf ;
w = sqrt(size(patches,1)) ;
vl_imarraysc(reshape(patches(:,1:10*10), w,w,[])) ;
axis image off ; hold on ; colormap gray ;
vl_demo_print('covdet_patches') ;
[frames, patches] = vl_covdet(imgs, ...
'descriptor', 'patch' ,...
'estimateAffineShape', true, ...
'estimateOrientation', false) ;
figure(5) ; clf ;
w = sqrt(size(patches,1)) ;
vl_imarraysc(reshape(patches(:,1:10*10), w,w,[])) ;
axis image off ; hold on ; colormap gray ;
vl_demo_print('covdet_affine_patches') ;
% --------------------------------------------------------------------
% Different detectors
% --------------------------------------------------------------------
names = {'DoG', 'Hessian', ...
'HarrisLaplace', 'HessianLaplace', ...
'MultiscaleHarris', 'MultiscaleHessian'} ;
figure(6) ; clf ;
for i = 1:numel(names)
frames = vl_covdet(imgs, 'method', names{i}) ;
vl_tightsubplot(3,2,i, 'margintop',0.025, 'marginright', 0.01) ;
imagesc(im) ; axis image off ;
hold on ;
vl_plotframe(frames) ;
title(names{i}) ;
end
vl_figaspect(3/4) ;
vl_demo_print('covdet_detectors',.9) ;
% --------------------------------------------------------------------
% Custom frames
% --------------------------------------------------------------------
delta = 15 ;
xr = delta:delta:size(im,2)-delta+1 ;
yr = delta:delta:size(im,1)-delta+1 ;
[x,y] = meshgrid(xr,yr) ;
frames = [x(:)'; y(:)'] ;
frames(end+1,:) = delta/2 ;
[frames, patches] = vl_covdet(imgs, ...
'frames', frames, ...
'estimateAffineShape', true, ...
'estimateOrientation', true) ;
figure(7) ; clf ;
imagesc(im) ;
axis image off ; hold on ; colormap gray ;
vl_plotframe(frames) ;
vl_demo_print('covdet_custom_frames',.8) ;
% --------------------------------------------------------------------
% Scale spaces
% --------------------------------------------------------------------
[frames, descrs, info] = vl_covdet(imgs) ;
figure(8) ; clf ;
vl_plotss(info.gss) ;
colormap gray ;
vl_figaspect(2) ;
vl_demo_print('covdet_gss',.8) ;
figure(9) ; clf ;
vl_plotss(info.css) ;
colormap gray ;
vl_figaspect(2) ;
vl_demo_print('covdet_css',.8) ;
figure(10) ; clf ;
subplot(1,2,1) ;
hist([info.peakScores],10) ;
xlabel('Peak Score') ;
ylabel('Occurences') ;
grid on ;
subplot(1,2,2) ;
hist([info.edgeScores],10) ;
xlabel('Edge Score') ;
ylabel('Occurences') ;
grid on ;
vl_figaspect(2) ;
vl_demo_print('covdet_scores',.9) ;
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