- added small value to norms in UnitNormFilter to prevent division by zero
- UnitNormFilter may be applied inline if the input is of type CV_32F
- added filter for creating gradient images based on integral images
- added filter for creating upright SURF-like feature vector
removed old experimental code from IntegralGradientFilter (other choice of rectangular areas used to compute gradient)
- added prototype for filtering image-files in DirectoryImageSource
- improved structure and runtime efficiency of histogram filters and exteded HOG filter
- added new specialized HOG filters
- reversed the meaning of the combine-flag of the SpatialHistogramFilter and renamed it to concatenate
- added a special variant to the SpatialHistogramFilter when the blocksize is one
- there are remaining TODOs within some of the changed/added filters that will be removed later
- added another parameter to PyramidFeatureExtractor::extract to enable skipping of layers
- added checks for the step parameters and region of interest to pyramid feature extractors
added one-class SVM
Changed initializer-list to push_back to be vs2012 compliant

- just for testing: added statismo