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# -----------------------------------------------------------------------
# Copyright: 2010-2021, imec Vision Lab, University of Antwerp
# 2013-2021, CWI, Amsterdam
#
# Contact: astra@astra-toolbox.com
# Website: http://www.astra-toolbox.com/
#
# This file is part of the ASTRA Toolbox.
#
#
# The ASTRA Toolbox 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 3 of the License, or
# (at your option) any later version.
#
# The ASTRA Toolbox 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 the ASTRA Toolbox. If not, see <http://www.gnu.org/licenses/>.
#
# -----------------------------------------------------------------------
# distutils: language = c++
def clipCircle(img):
cdef int i,j
cdef double x2,y2,mid,bnd
cdef long sz,sz2
sz = img.shape[0]
sz2 = sz*sz
bnd = sz2/4.
mid = (sz-1.)/2.
nDel=0
for i in range(sz):
for j in range(sz):
x2 = (i-mid)*(i-mid)
y2 = (j-mid)*(j-mid)
if x2+y2>bnd:
img[i,j]=0
nDel=nDel+1
return nDel
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