#==============================================================================
#
# Project:   SharpImage
# Module:    Sobel.py
# Language:  IronPython
# Author:    Dan Mueller
# Date:      $Date: 2007-07-06 10:57:00 +1000 (Fri, 06 Jul 2007) $
# Revision:  $Revision: 2 $
#
# Copyright (c) Queensland University of Technology (QUT) 2007.
# All rights reserved.
#
# This software is distributed WITHOUT ANY WARRANTY; without even
# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
# PURPOSE.  See the above copyright notices for more information.
#
#==============================================================================

# Import the base script class
import ImageToImageScript
from ImageToImageScript import *

# Add reference and import Edges library
clr.AddReference("ManagedITK.EdgeFilters")
from itk import *

class SobelScript(ImageToImageScriptObject):
    # -------------------------------------------------------------------------
    Name = "Sobel"
    Help = """This script uses the Sobel operator to calculate the image gradient
              and then finds the magnitude of this gradient vector. The Sobel
              gradient magnitude (square-root sum of squares) is an indication
              of edge strength."""
    Parameters = """None"""
    # -------------------------------------------------------------------------

    def ThreadedDoWork(self):
        """ Perform the main functions of the script. """
        """ NOTE: This function is invoked on a background thread. """
        try:
            self.StartedWork()
            self.WriteInputName()
            filterSobel = itkSobelEdgeDetectionImageFilter.New( self.Input, self.Output )
            self.AddEventHandlersToProcessObject( filterSobel )
            filterSobel.SetInput( self.Input )
            filterSobel.UpdateLargestPossibleRegion()
            filterSobel.GetOutput( self.Output )
            self.DisconnectInputAndOutput()
            self.DisposeOfObject( filterSobel )
            self.WriteOutputName()
            self.FinishedWork( True )
        except Exception, ex:
            self.HandleException( ex )
            self.FinishedWork( False )
            self.Finalise( )