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#
# Copyright (C) 2013 Christian Brandt and Christoph Dalitz
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
from gamera.plugin import *
import _fourier_features
class fourier_broken(PluginFunction):
"""Fourier descriptor for arbitrary (not necessarily connected) shapes
according to equations (18) and (19) in
C. Dalitz, C. Brandt, S. Goebbels, D. Kolanus:
`Fourier Descriptors for Broken Shapes`__.
EURASIP Journal on Advances in Signal Processing 2013:161, 2013
The coefficient c_0 is used for scale normalisation. The
absolute values of the coefficients A(0), A(N-1) A(1), A(N-2), ... are
returned.
+---------------------------+
| **Invariant to:** |
+-------+----------+--------+
| scale | rotation | mirror |
+-------+----------+--------+
| X | X | |
+-------+----------+--------+
.. __: http://dx.doi.org/10.1186/1687-6180-2013-161
"""
category = "Features"
self_type = ImageType([ONEBIT])
return_type = FloatVector(length=48)
feature_function = True
doc_examples = [(ONEBIT,)]
class FourierFeaturesModule(PluginModule):
cpp_headers = ["fourier_features.hpp"]
category = "Features"
functions = [fourier_broken]
cpp_sources = ["src/geostructs/kdtree.cpp", "src/geostructs/delaunaytree.cpp"]
extra_compile_args = ["-DFDLENGTH=48"]
author = "Christian Brandt and Christoph Dalitz"
url = "http://gamera.sourceforge.net/"
module = FourierFeaturesModule()
|
