-
Notifications
You must be signed in to change notification settings - Fork 187
/
cnn_ucf101_get_frame_batch.m
308 lines (266 loc) · 9.48 KB
/
cnn_ucf101_get_frame_batch.m
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
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
function imo = cnn_ucf101_get_frame_batch(images, varargin)
opts.nFramesPerVid = 1;
opts.numAugments = 1;
opts.frameSample = 'uniformly';
opts.uniformAugments = false;
opts.imageDir = '';
opts.temporalStride = 0;
opts.imageSize = [227, 227] ;
opts.border = [29, 29] ;
opts.averageImage = [] ;
opts.rgbVariance = [] ;
opts.augmentation = 'croponly' ;
opts.interpolation = 'bilinear' ;
opts.numAugments = 1 ;
opts.numThreads = 0 ;
opts.prefetch = false ;
opts.keepAspect = true;
opts.cheapResize = 0;
opts.frameList = NaN;
opts.nFrames = [];
opts.imReadSz = [];
opts.stretchAspect = 4/3 ;
opts.stretchScale = 1.2 ;
[opts, varargin] = vl_argparse(opts, varargin);
imgDir = opts.imageDir;
prefetch = opts.prefetch & isempty(opts.frameList);
switch opts.augmentation
case 'randCropFlip'
case 'croponly'
tfs = [.5 ; .5 ; 0 ];
case 'f5'
tfs = [...
.5 0 0 1 1 .5 0 0 1 1 ;
.5 0 1 0 1 .5 0 1 0 1 ;
0 0 0 0 0 1 1 1 1 1] ;
case 'f25'
[tx,ty] = meshgrid(linspace(0,1,50)) ;
tfs = [tx(:)' ; ty(:)' ; zeros(1,numel(tx))] ;
tfs_ = tfs ;
tfs_(3,:) = 1 ;
tfs = [tfs,tfs_] ;
case 'borders25'
[tx1,ty1] = meshgrid(linspace(.75,1,20)) ;
[tx2,ty2] = meshgrid(linspace(0,.25,20)) ;
tx = [tx1 tx2]; ty = [ty1 ty2];
tfs = [tx(:)' ; ty(:)' ; zeros(1,numel(tx))] ;
tfs_ = tfs ;
tfs_(3,:) = 1 ;
tfs = [tfs,tfs_] ;
case 'borders'
opts.imReadSz(1) = 224 + (342-224).*rand();
opts.imReadSz(2) = 300 + (480-300).*rand();
opts.cheapResize = true;
otherwise
opts.imReadResize = 0;
end
if iscell(opts.frameList)
if isempty(opts.imReadSz)
im = vl_imreadjpeg(opts.frameList{1}, 'numThreads', opts.numThreads ) ;
else
im = vl_imreadjpeg(opts.frameList{1}, 'numThreads', opts.numThreads, 'resize', opts.imReadSz ) ;
end
sampled_frame_nr = opts.frameList{2};
else
sampled_frame_nr = cell(numel(images),1);
frames = cell(numel(images), opts.nFramesPerVid);
for i=1:numel(images)
vid_name = images{i};
nFrames = opts.nFrames(i);
if strcmp(opts.frameSample, 'uniformly')
sampleRate = max(floor((nFrames)/opts.nFramesPerVid),1);
frameSamples =1:sampleRate:nFrames ;
elseif strcmp(opts.frameSample, 'temporalStride')
shift = floor(mod(nFrames,opts.temporalStride)/2); % shift to centre of long videos
frameSamples = 1:opts.temporalStride:nFrames;
elseif strcmp(opts.frameSample, 'random')
frameSamples = randperm(nFrames);
elseif strcmp(opts.frameSample, 'temporalStrideRandom')
sampleStart = randi(opts.temporalStride) ;
frameSamples = sampleStart:opts.temporalStride:nFrames;
if isempty(frameSamples)
frameSamples = 1:opts.temporalStride:nFrames;
end
end
if length(frameSamples) < opts.nFramesPerVid,
diff = opts.nFramesPerVid - length(frameSamples);
frameSamples = padarray(frameSamples,[0 diff],'symmetric','post');
elseif length(frameSamples) > opts.nFramesPerVid,
s = randi(length(frameSamples)-opts.nFramesPerVid);
frameSamples = frameSamples(s:s+opts.nFramesPerVid-1);
end
for k = 1:opts.nFramesPerVid
frames{i,k} = fullfile(vid_name, ['frame' sprintf('%06d.jpg', frameSamples(k))]) ;
end
if iscell(opts.imageDir)
imgDir = opts.imageDir{i};
end
frames(i,1:opts.nFramesPerVid) = strcat([imgDir filesep], frames(i,1:opts.nFramesPerVid));
sampled_frame_nr{i} = frameSamples;
end
if opts.numThreads > 0
if prefetch
if isempty(opts.imReadSz)
vl_imreadjpeg(frames, 'numThreads', opts.numThreads, 'prefetch' ) ;
else
vl_imreadjpeg(frames, 'numThreads', opts.numThreads, 'prefetch', 'resize', opts.imReadSz ) ;
end
imo = {frames sampled_frame_nr} ;
return ;
end
if isempty(opts.imReadSz)
im = vl_imreadjpeg(frames, 'numThreads', opts.numThreads) ;
else
im = vl_imreadjpeg(frames, 'numThreads', opts.numThreads, 'resize', opts.imReadSz ) ;
end
end
end
%% no augm
if strcmp(opts.augmentation, 'none')
szw = cellfun(@(x) size(x,2),im);
szh = cellfun(@(x) size(x,1),im);
h_min = min(szh(:));
w_min = min(szw(:));
sz = [h_min w_min] ;
sz = max(opts.imageSize(1:2), sz);
sz = min(2*opts.imageSize(1:2), sz);
scal = ([h_min w_min] ./ sz);
imo = ( zeros(sz(1), sz(2), opts.imageSize(3), ...
numel(images), 2 * opts.nFramesPerVid, 'single') );
for i=1:numel(images)
si = 1 ;
for k = 1:opts.nFramesPerVid
if numel(unique(szw)) > 1 || numel(unique(szh)) > 1
im{i,k} = im{i,k}(1:h_min,1:w_min,:);
end
imt = cat(3, im{i,k}) ;
if any(scal ~= 1)
imt = imresize(imt, sz );
end
imo(:, :, :, i, si) = imt;
imo(:, :, :, i, si+1) = imt(:, end:-1:1,:);
si = si + 2 ;
end
end
if ~isempty(opts.averageImage)
opts.averageImage = mean(mean(opts.averageImage,1),2) ;
imo = bsxfun(@minus, imo,opts.averageImage) ;
end
return;
end
%% augment now
if exist('tfs', 'var')
[~,transformations] = sort(rand(size(tfs,2), numel(images)*opts.nFramesPerVid), 1) ;
end
imo = ( zeros(opts.imageSize(1), opts.imageSize(2), opts.imageSize(3), ...
numel(images), opts.numAugments * opts.nFramesPerVid, 'single') ) ;
szw = cellfun(@(x) size(x,2),im);
szh = cellfun(@(x) size(x,1),im);
for i=1:numel(images)
si = 1 ;
h_min = min(szh(:));
w_min = min(szw(:));
if strcmp( opts.augmentation, 'borders25')
sz = round(min(opts.imageSize(1:2)' .* (.75+0.5*rand(2,1)), [h_min; w_min])) ; % 0.75 +- 0.5, not keep aspect
elseif strcmp( opts.augmentation, 'stretch')
aspect = exp((2*rand-1) * log(opts.stretchAspect)) ;
scale = exp((2*rand-1) * log(opts.stretchScale)) ;
tw = opts.imageSize(2) * sqrt(aspect) * scale ;
th = opts.imageSize(1) / sqrt(aspect) * scale ;
reduce = min([w_min / tw, h_min / th, 1]) ;
sz = round(reduce * [th ; tw]) ;
else
sz(1) = round(160 + (256-160).*rand());
sz(2) = round(160 + (256-160).*rand());
end
for k = 1:opts.nFramesPerVid
imt = im{i,k} ;
w = size(imt,2) ;
h = size(imt,1) ;
if ~strcmp(opts.augmentation, 'uniform')
if ~isempty(opts.rgbVariance)
opts.averageImage = bsxfun(@plus, opts.averageImage, reshape(opts.rgbVariance * randn(opts.imageSize(3),1), 1,1,opts.imageSize(3))) ;
end
for ai = 1:opts.numAugments
if k == 1
switch opts.augmentation
case 'stretch'
dx = randi(w - sz(2) + 1 ) ;
dy = randi(h - sz(1) + 1 ) ;
flip = rand > 0.5 ;
case 'multiScaleRegular'
dy = [0 h-sz(1) 0 h-sz(1) floor((h-sz(1)+1)/2)] + 1;
dx = [0 w-sz(2) w-sz(2) 0 floor((w-sz(2)+1)/2)] + 1;
corner = randi(5);
dx = dx(corner); dy = dy(corner);
flip = rand > 0.5 ;
case 'borders25'
tf = tfs(:, transformations(mod(ai-1, numel(transformations)) + 1)) ;
dx = floor((w - sz(2)) * tf(2)) + 1 ;
dy = floor((h - sz(1)) * tf(1)) + 1 ;
flip = tf(3) ;
case 'borders'
randx = rand > 0.5 ;
if randx
top = rand > 0.5 ;
dx = randi(w - sz(2) + 1 ) ;
dy = floor((h - sz(1)) * top) + 1 ;
else
right = rand > 0.5 ;
dx = floor((w - sz(2)) * right) + 1 ;
dy = randi(h - sz(1) + 1 ) ;
end
flip = rand > 0.5 ;
otherwise
tf = tfs(:, transformations(mod(ai-1, numel(transformations)) + 1)) ;
dx = floor((w - sz(2)) * tf(2)) + 1 ;
dy = floor((h - sz(1)) * tf(1)) + 1 ;
flip = tf(3) ;
end
end
if opts.cheapResize
sx = round(linspace(dx, sz(2)+dx-1, opts.imageSize(2))) ;
sy = round(linspace(dy, sz(1)+dy-1, opts.imageSize(1))) ;
else
factor = [opts.imageSize(1)/sz(1) ...
opts.imageSize(2)/sz(2)];
if any(abs(factor - 1) > 0.0001)
imt = imresize(gather(imt(dy:sz(1)+dy-1,dx:sz(2)+dx-1,:)), opts.imageSize(1:2));
end
sx = 1:opts.imageSize(2); sy = 1:opts.imageSize(1);
end
if flip
sx = fliplr(sx) ;
imo(:,:,:,i,si) = imt(sy,sx,:) ;
else
imo(:,:,:,i,si) = imt(sy,sx,:) ;
end
si = si + 1 ;
end
else
% oversample (4 corners, center, and their x-axis flips)
indices_y = [0 h-opts.imageSize(1)] + 1;
indices_x = [0 w-opts.imageSize(2)] + 1;
center_y = floor(indices_y(2) / 2)+1;
center_x = floor(indices_x(2) / 2)+1;
if opts.numAugments == 6, indices_y = center_y;
elseif opts.numAugments == 2, indices_x = []; indices_y = [];
elseif opts.numAugments ~= 10, error('only 6 or 10 uniform crops allowed'); end
for y = indices_y
for x = indices_x
imo(:, :, :, i, si) = ...
imt(y:y+opts.imageSize(1)-1, x:x+opts.imageSize(2)-1, :);
imo(:, :, :, i, si+1) = imo(:, end:-1:1, :, i, si);
si = si + 2 ;
end
end
imo(:,:,:, i,si) = imt(center_y:center_y+opts.imageSize(1)-1,center_x:center_x+opts.imageSize(2)-1,:);
imo(:,:,:, i,si+1) = imo(:, end:-1:1, :, i, si);
si = si + 2;
end
end
end
if ~isempty(opts.averageImage)
imo = bsxfun(@minus, imo, opts.averageImage) ;
end
end