#==============================================================================
#
# Project:   SharpImage
# Module:    Canny.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 CannyScript(ImageToImageScriptObject):
    # -------------------------------------------------------------------------
    Name = "Canny"
    Help = """Applies the Canny edge detection algorithm to the input image."""
    Parameters = """(pixel) UpperThreshold = upper threshold value for detected edges (5.0)
                    (pixel) LowerThreshold = lower threshold value for detected edges (0.0)
                    (pixel) OutsideValue = the value for pixels outside a detected edge (0.0)
                    (double) Variance = the variance parameter for Gaussian smoothing (0.1)
                    (double) MaximumError = the maximum error parameter for Gaussian smoothing (0.01)"""
    LowerThreshold = 0.0
    UpperThreshold = 5.0
    OutsideValue = 0.0
    Variance = 0.1
    MaximumError = 0.01
    # -------------------------------------------------------------------------

    def ThreadedDoWork(self):
        """ Perform the main functions of the script. """
        """ NOTE: This function is invoked on a background thread. """
        try:
            self.StartedWork()
            self.WriteInputName()
            filterCanny = itkCannyEdgeDetectionImageFilter.New( self.Input, self.Output )
            self.AddEventHandlersToProcessObject( filterCanny )
            filterCanny.SetInput( self.Input )
            filterCanny.LowerThreshold = itkPixel( self.Output.PixelType, self.LowerThreshold )
            filterCanny.UpperThreshold = itkPixel( self.Output.PixelType, self.UpperThreshold )
            filterCanny.OutsideValue = itkPixel( self.Output.PixelType, self.OutsideValue )
            filterCanny.SetVariance( self.Variance )
            filterCanny.SetMaximumError( self.MaximumError )
            self.WriteLineToConsole( "LowerThreshold=" + self.LowerThreshold.ToString() )
            self.WriteLineToConsole( "UpperThreshold=" + self.UpperThreshold.ToString() )
            self.WriteLineToConsole( "OutsideValue=" + self.OutsideValue.ToString() )
            self.WriteLineToConsole( "Variance=" + self.Variance.ToString() )
            self.WriteLineToConsole( "MaximumError=" + self.MaximumError.ToString() )
            filterCanny.UpdateLargestPossibleRegion()
            filterCanny.GetOutput( self.Output )
            self.DisconnectInputAndOutput()
            self.DisposeOfObject( filterCanny )
            self.WriteOutputName()
            self.FinishedWork( True )
        except Exception, ex:
            self.HandleException( ex )
            self.FinishedWork( False )
            self.Finalise( )