open source pkg v1

pkg/OpenFace/matlab_runners/Demos/Read_HOG_file.m

@@ -0,0 +1,59 @@
+function [hog_data, valid_inds] = Read_HOG_file(hog_file)
+
+    valid_inds = [];
+            
+    f = fopen(hog_file, 'r');
+
+    % Pre-allocated data
+    curr_data = [];
+    curr_ind = 0;
+
+    while(~feof(f))
+
+        if(curr_ind == 0)
+            num_cols = fread(f, 1, 'int32');
+            if(isempty(num_cols))
+                break;
+            end
+
+            num_rows = fread(f, 1, 'int32');
+            num_chan = fread(f, 1, 'int32');
+
+            curr_ind = curr_ind + 1;            
+
+            % preallocate some space
+            if(curr_ind == 1)
+                curr_data = zeros(1000, 1 + num_rows * num_cols * num_chan);
+                num_feats =  1 + num_rows * num_cols * num_chan;
+            end
+
+            if(curr_ind > size(curr_data,1))
+                curr_data = cat(1, curr_data, zeros(1000, 1 + num_rows * num_cols * num_chan));
+            end
+            feature_vec = fread(f, [1, 1 + num_rows * num_cols * num_chan], 'float32');
+            curr_data(curr_ind, :) = feature_vec;
+        else
+
+            % Reading in batches of 5000
+
+            feature_vec = fread(f, [4 + num_rows * num_cols * num_chan, 5000], 'float32');
+            feature_vec = feature_vec(4:end,:)';
+
+            num_rows_read = size(feature_vec,1);
+
+            if(~isempty(feature_vec))
+                curr_data(curr_ind+1:curr_ind+num_rows_read,:) = feature_vec;
+                curr_ind = curr_ind + size(feature_vec,1);
+            end
+        end
+
+    end
+
+    fclose(f);
+
+    % Do some cleanup, remove un-allocated data    
+    if(~isempty(curr_data))        
+        valid_inds = curr_data(1:curr_ind,1);
+        hog_data = curr_data(1:curr_ind,2:end);    
+    end
+end