#==========================================================================
#
#   Copyright Insight Software Consortium
#
#   Licensed under the Apache License, Version 2.0 (the "License");
#   you may not use this file except in compliance with the License.
#   You may obtain a copy of the License at
#
#          http://www.apache.org/licenses/LICENSE-2.0.txt
#
#   Unless required by applicable law or agreed to in writing, software
#   distributed under the License is distributed on an "AS IS" BASIS,
#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#   See the License for the specific language governing permissions and
#   limitations under the License.
#
#==========================================================================*/

#
#  Example on the use of the CannyEdgeDetectionImageFilter
#

import itk
from sys import argv, stderr, exit
itk.auto_progress(2)

if len(argv) < 3:
  print >> stderr, "Usage: CannyEdgeDetectionImageFilter.py  inputImage outputImage [variance]"
  exit(1)

variance = 2.0
if len(argv) > 3:
  variance = float( argv[3] )
  print variance

reader = itk.ImageFileReader.IF2.New( FileName=argv[1] )
filter  = itk.CannyEdgeDetectionImageFilter.IF2IF2.New( reader, Variance=variance )
outputCast = itk.RescaleIntensityImageFilter.IF2IUC2.New( filter, OutputMinimum=0, OutputMaximum=255 )
itk.write( outputCast, argv[2] )
