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</o:shapelayout></xml><![endif]--></head><body lang=ES link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black;background:white'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black;background:white'>Hi,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black;background:white'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black;background:white'>I am not using the 'RecursiveGaussianFilter' neither the 'discretegaussianimagefilter'. I am using the 'GradientImageFilter' ,declared in the header file as follows:<span class=apple-converted-space> </span></span><span lang=EN-US style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'><br><br><i><span style='background:white'> typedef double operatorValueType ;<span class=apple-converted-space> </span><br> typedef double outputValueType ;<span class=apple-converted-space> </span><br> typedef double InputPixelType ;<span class=apple-converted-space> </span><br> typedef itk::Image < InputPixelType , 2 > InputImageType ;<span class=apple-converted-space> </span><br> typedef itk::GradientImageFilter < InputImageType , operatorValueType , outputValueType > GradientFilterType ;</span></i><br><br><span style='background:white'>And creating the filter in the main file:<span class=apple-converted-space> </span></span><br><i><span style='background:white'><br> GradientFilterType::Pointer gradientFilter = GradientFilterType::New();<span class=apple-converted-space> </span><br></span></i><br><br><span style='background:white'>I think there is a problem in the code I posted before because I have used this methodology other times and it works always perfectly...<span class=apple-converted-space> </span></span><br><br></span><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black;background:white'>Thanks for your reply.<span class=apple-converted-space> </span></span><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'><br><br><span style='background:white'>Antonio</span></span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>De:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> cagatay bilgin [mailto:bilgincc@gmail.com] <br><b>Enviado el:</b> lunes, 16 de enero de 2012 20:10<br><b>Para:</b> Antonio Gómez Barquero<br><b>CC:</b> insight-users@itk.org<br><b>Asunto:</b> Re: [Insight-users] GradientFilterType not working as expected<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Hi Antonio, <o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>I think what you are experiencing could be a result<o:p></o:p></p><div><div><p class=MsoNormal>of the RecursiveGaussianFilter. This filter is fast and <o:p></o:p></p></div><div><p class=MsoNormal>gives an ``approximation" (either the manual or the webpage <o:p></o:p></p></div><div><p class=MsoNormal>has links to the paper that the filter implements). If you want <o:p></o:p></p></div><div><p class=MsoNormal>more accurate but possibly slower results try the discrete <o:p></o:p></p></div><div><p class=MsoNormal>gaussian filter. You can set the maximum error for your <o:p></o:p></p></div><div><p class=MsoNormal>gradients using discretegaussianimagefilter. <o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Regards,<o:p></o:p></p></div><div><p class=MsoNormal>Cagatay<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>2012/1/16 Antonio Gómez Barquero <<a href="mailto:agb1@alu.upct.es">agb1@alu.upct.es</a>><o:p></o:p></p><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span style='font-size:10.0pt'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'>Hi all,<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span style='font-size:10.0pt'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US>I am calculating the typical registration example from one white point to the letter 'C' over a black background.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US>In the first iteration of my program ( numiter = 1 ), it calculates the gradient from a 'reader' and the result is correct. In the next iteration ( numiter = 2 ) the result is not completely correct, in the borders of the image there are some wrong values, despite the gradient values in the centre of the image are correct. </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US>Below is my code, I really need to fix this problem soon and I have spent some days without results! Any help would be really nice.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:blue'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:blue'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:blue'>double</span><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> *dT1 = <span style='color:blue'>new</span> <span style='color:blue'>double</span>[ancho*alto]; <span style='color:green'>// width * height</span></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:blue'>double</span><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> *dT2 = <span style='color:blue'>new</span> <span style='color:blue'>double</span>[ancho*alto]; <span style='color:green'>// width * height</span></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:green'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> <span style='color:green'>// Definition of the input image container and output(gradient)</span></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'>GradientFilterType::Pointer gradientFilter = GradientFilterType::New();</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> ImageType::Pointer im_T = ImageType::New();</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> <span style='color:blue'>if</span> (numIter == 1){ <span style='color:green'>// The first time read image from reader</span></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> gradientFilter->SetInput(reader_T->GetOutput());</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> }</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> <span style='color:blue'>else</span> {</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> <span style='color:green'>// Definition of the basic parameters of the image that contents the input data</span></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> ImageType::IndexType start;</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> start[0] = 0 ; <span style='color:green'>// first index on X</span></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> start[1] = 0 ; <span style='color:green'>// first index on Y</span></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> ImageType::SizeType size;</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> size[0] = ancho; <span style='color:green'>// size along X</span></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> size[1] = alto ; <span style='color:green'>// size along Y</span></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> ImageType::RegionType region;</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> region.SetSize(size);</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> region.SetIndex(start);</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> im_T->SetRegions(region);</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> im_T->Allocate(); <span style='color:green'>// allocate the image</span></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> double2itk ( T , &im_T); <span style='color:green'>// T(double*) --> im_T(itk::Image)</span></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> gradientFilter->SetInput(im_T);</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:10.0pt;line-height:115%'><span lang=EN-US style='font-size:10.0pt;line-height:115%;font-family:"Courier New"'> }</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:10.0pt;line-height:115%'><span lang=EN-US style='font-size:10.0pt;line-height:115%;font-family:"Courier New"'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> <span style='color:green'>// Common part</span></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> gradientFilter->SetUseImageSpacingOff(); <span style='color:green'>// for derivation in isotropic pixel space</span></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> gradientFilter->Update();</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> SelectionFilterType::Pointer componentExtractor_x = SelectionFilterType::New();</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> SelectionFilterType::Pointer componentExtractor_y = SelectionFilterType::New();</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> </span><span style='font-size:10.0pt;font-family:"Courier New"'>componentExtractor_x->SetIndex(0);<span style='color:green'>// componente x</span></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span style='font-size:10.0pt;font-family:"Courier New"'> componentExtractor_y->SetIndex(1);<span style='color:green'>// componente y</span></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span style='font-size:10.0pt;font-family:"Courier New";color:green'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span style='font-size:10.0pt;font-family:"Courier New"'> </span><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'>componentExtractor_x->SetInput(gradientFilter->GetOutput());</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> componentExtractor_y->SetInput(gradientFilter->GetOutput());</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> componentExtractor_x->Update();</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> componentExtractor_y->Update();</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> dT2 = itk2double(componentExtractor_x->GetOutput(),dT2,ancho,alto); <span style='color:green'>// X-Component of the gradient</span></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> dT1 = itk2double(componentExtractor_y->GetOutput(),dT1,ancho,alto); <span style='color:green'>// Y-Component of the gradient</span></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:green'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US>Thanks!</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span lang=EN-US>Antonio Gómez Barquero</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=ES-TRAD style='font-size:8.0pt'>Ingeniero de Telecomunicaciones -Becario Investigador asociado a Actividades de I+D+I </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=ES-TRAD style='font-size:8.0pt'>GTTS ( Grupo de Tratamiento y Teoría de la Señal)[ </span><span style='font-size:8.0pt'><a href="http://gtts.upct.es/" target="_blank">http://gtts.upct.es/</a></span><span lang=ES-TRAD style='font-size:8.0pt'>]</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=ES-TRAD style='font-size:8.0pt'>UPCT (Universidad Politécnica de Cartagena)[ </span><span style='font-size:8.0pt'><a href="http://www.upct.es/" target="_blank">http://www.upct.es/</a>]</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p></div></div><p class=MsoNormal style='margin-bottom:12.0pt'><br>_____________________________________<br>Powered by <a href="http://www.kitware.com" target="_blank">www.kitware.com</a><br><br>Visit other Kitware open-source projects at<br><a href="http://www.kitware.com/opensource/opensource.html" target="_blank">http://www.kitware.com/opensource/opensource.html</a><br><br>Kitware offers ITK Training Courses, for more information visit:<br><a href="http://www.kitware.com/products/protraining.html" target="_blank">http://www.kitware.com/products/protraining.html</a><br><br>Please keep messages on-topic and check the ITK FAQ at:<br><a href="http://www.itk.org/Wiki/ITK_FAQ" target="_blank">http://www.itk.org/Wiki/ITK_FAQ</a><br><br>Follow this link to subscribe/unsubscribe:<br><a href="http://www.itk.org/mailman/listinfo/insight-users" target="_blank">http://www.itk.org/mailman/listinfo/insight-users</a><o:p></o:p></p></div><p class=MsoNormal><o:p> </o:p></p></div></div></div></div></body></html>