diff --git a/bob/pad/face/config/preprocessor/video_sparse_coding.py b/bob/pad/face/config/preprocessor/video_sparse_coding.py
new file mode 100644
index 0000000000000000000000000000000000000000..5de78ecf6851bacd36d4f9deefd1556cb1323530
--- /dev/null
+++ b/bob/pad/face/config/preprocessor/video_sparse_coding.py
@@ -0,0 +1,23 @@
+#!/usr/bin/env python
+
+from bob.pad.face.preprocessor import VideoSparseCoding
+
+
+#=======================================================================================
+# Define instances here:
+
+BLOCK_SIZE = 5
+BLOCK_LENGTH = 10
+MIN_FACE_SIZE = 50
+NORM_FACE_SIZE = 64
+DICTIONARY_FILE_NAMES = ["/idiap/user/onikisins/Projects/ODIN/Python/scripts/test_scripts/data/dictionary_front.hdf5",
+ "/idiap/user/onikisins/Projects/ODIN/Python/scripts/test_scripts/data/dictionary_hor.hdf5",
+ "/idiap/user/onikisins/Projects/ODIN/Python/scripts/test_scripts/data/dictionary_vert.hdf5"]
+FRAME_STEP = 10
+
+preprocessor = VideoSparseCoding(gblock_size = BLOCK_SIZE,
+ block_length = BLOCK_LENGTH,
+ min_face_size = MIN_FACE_SIZE,
+ norm_face_size = NORM_FACE_SIZE,
+ dictionary_file_names = DICTIONARY_FILE_NAMES,
+ frame_step = FRAME_STEP)
\ No newline at end of file
diff --git a/bob/pad/face/extractor/VideoHistOfSparseCodes.py b/bob/pad/face/extractor/VideoHistOfSparseCodes.py
new file mode 100644
index 0000000000000000000000000000000000000000..61747358cf625ba3043c521c46bcd78d800f0d3d
--- /dev/null
+++ b/bob/pad/face/extractor/VideoHistOfSparseCodes.py
@@ -0,0 +1,166 @@
+#!/usr/bin/env python2
+# -*- coding: utf-8 -*-
+"""
+Created on Wed Sep 27 11:33:45 2017
+
+@author: Olegs Nikisins
+"""
+
+#==============================================================================
+# Import what is needed here:
+
+from bob.bio.base.extractor import Extractor
+
+import numpy as np
+
+import bob.bio.video
+
+from bob.pad.face.extractor import ImageQualityMeasure
+
+#==============================================================================
+# Main body:
+
+class VideoHistOfSparseCodes(Extractor, object):
+ """
+ This class is designed to extract histograms of sparse codes.
+
+ **Parameters:**
+
+ ``method`` : :py:class:`str`
+ A method to use in the histogram computation. Two options are available:
+ "mean" and "hist". Default: "mean".
+ """
+
+ #==========================================================================
+ def __init__(self,
+ method = "mean"):
+
+ super(VideoHistOfSparseCodes, self).__init__(method = method)
+
+ self.method = method
+
+ # extractor to process a single image/frame:
+ extractor = ImageQualityMeasure()
+
+ # This extractor is used only to write and read the feature vectors.
+ self.video_extractor = bob.bio.video.extractor.Wrapper(extractor)
+
+
+ #==========================================================================
+ def comp_hist_of_sparse_codes(self, frames, method):
+ """
+ Compute the histograms of sparse codes.
+ """
+
+ histograms = []
+
+ for frame_data in frames:
+
+ frame = frame_data[1]
+
+ if method == "mean":
+
+ frame_codes = np.mean(frame, axis=1)
+
+ if method == "hist":
+
+ frame_codes = np.mean(frame!=0, axis=1)
+
+ for idx, row in enumerate(frame_codes):
+
+ frame_codes[idx,:] = row/np.sum(row)
+
+ hist = frame_codes.flatten()
+
+ histograms.append(hist)
+
+ return histograms
+
+
+ #==========================================================================
+ def convert_sparse_codes_to_frame_container(self, list_of_arrays):
+ """
+ Convert an input list of arrays into Frame Container.
+
+ **Parameters:**
+
+ ``list_of_arrays`` : [:py:class:`numpy.ndarray`]
+ A list of arrays.
+
+ **Returns:**
+
+ ``frame_container`` : FrameContainer
+ FrameContainer containing the feature vectors.
+ """
+
+ frame_container = bob.bio.video.FrameContainer() # initialize the FrameContainer
+
+ for idx, item in enumerate(list_of_arrays):
+
+ frame_container.add(idx, item) # add frame to FrameContainer
+
+ return frame_container
+
+
+ #==========================================================================
+ def __call__(self, frames):
+ """
+ Extract feature vectors.
+
+ **Parameters:**
+
+ ``frames`` : FrameContainer or string.
+ Data stored in the FrameContainer,
+ see ``bob.bio.video.utils.FrameContainer`` for further details.
+
+ **Returns:**
+
+ ``frame_container`` : FrameContainer
+ Histograms of sparse codes stored in the FrameContainer.
+ """
+
+ histograms = self.comp_hist_of_sparse_codes(frames, self.method)
+
+ frame_container = self.convert_sparse_codes_to_frame_container(histograms)
+
+ return frame_container
+
+
+ #==========================================================================
+ def write_feature(self, frames, file_name):
+ """
+ Writes the given data (that has been generated using the __call__ function of this class) to file.
+ This method overwrites the write_data() method of the Extractor class.
+
+ **Parameters:**
+
+ ``frames`` :
+ Data returned by the __call__ method of the class.
+
+ ``file_name`` : :py:class:`str`
+ Name of the file.
+ """
+
+ self.video_extractor.write_feature(frames, file_name)
+
+
+ #==========================================================================
+ def read_feature(self, file_name):
+ """
+ Reads the preprocessed data from file.
+ This method overwrites the read_data() method of the Extractor class.
+
+ **Parameters:**
+
+ ``file_name`` : :py:class:`str`
+ Name of the file.
+
+ **Returns:**
+
+ ``frames`` : :py:class:`bob.bio.video.FrameContainer`
+ Frames stored in the frame container.
+ """
+
+ frames = self.video_extractor.read_feature(file_name)
+
+ return frames
diff --git a/bob/pad/face/preprocessor/__init__.py b/bob/pad/face/preprocessor/__init__.py
index c9c5a4225d2dfff5065d2559ecea9c6ebed03b0f..dc5b3685e5595b51cb5c8dd3a72bd59bd2c74927 100644
--- a/bob/pad/face/preprocessor/__init__.py
+++ b/bob/pad/face/preprocessor/__init__.py
@@ -1,6 +1,7 @@
from .VideoFaceCrop import VideoFaceCrop
from .ImageFaceCrop import ImageFaceCrop
from .FrameDifference import FrameDifference
+from .VideoSparseCoding import VideoSparseCoding
def __appropriate__(*args):
@@ -25,5 +26,7 @@ __appropriate__(
VideoFaceCrop,
ImageFaceCrop,
FrameDifference,
+ VideoSparseCoding,
)
__all__ = [_ for _ in dir() if not _.startswith('_')]
+
diff --git a/setup.py b/setup.py
index 7ca82566e5123e8dae0406fbcbf9f910df699780..aea2d186fb680a1ae9cf423f5c132a63cb9f4180 100644
--- a/setup.py
+++ b/setup.py
@@ -103,6 +103,9 @@ setup(
# registered preprocessors:
'bob.pad.preprocessor': [
'empty-preprocessor = bob.pad.face.config.preprocessor.filename:empty_preprocessor', # no preprocessing
+
+ # The sparse coding based preprocessors
+ 'sparse-coding-preprocessor = bob.pad.face.config.preprocessor.video_sparse_coding:preprocessor',
],
# registered preprocessors: