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</o:shapelayout></xml><![endif]--></head><body lang=ES link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'>Hello all,<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'>This is not exactly ITK problem, but I suppose that the use of the fftw library can be used for normal medical image processing, if this question does not fit here, I apologize in advanced.<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'>I want to do a ‘complex_to_real’ transformation, it means, the IFFT. I realised that I need to preserve the inputs of the transformation for a later use, so I add to the plan of the ‘dft’ the flag : “PRESERVE_INPUT”. <o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'>After adding this flag I become with a problem in compilation time , it goes to ‘dbgmalloc.c’, that means that it should be a allocation memory problem, but I didn’t change anything, and without the new flag it worked properly.<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'>Can you give me some hints?<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p><p class=MsoNormal style='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";color:green'>// IFFT ( U1,U2 --> u1,u2)<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;font-family:"Courier New"'> <span style='color:green'>//----IFFT-----<o:p></o:p></span></span></p><p class=MsoNormal style='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";color:blue'>double</span><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> *u1 = (<span style='color:blue'>double</span>*) malloc(<span style='color:blue'>sizeof</span>(<span style='color:blue'>double</span>)*N_fft);<span style='color:green'> <o:p></o:p></span></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> <span style='color:blue'>double</span> *u2 = (<span style='color:blue'>double</span>*) malloc(<span style='color:blue'>sizeof</span>(<span style='color:blue'>double</span>)*N_fft);<o:p></o:p></span></p><p class=MsoNormal style='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"'>fftw_plan p3;<span style='color:green'><o:p></o:p></span></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;font-family:"Courier New"'> fftw_plan p4;<span style='color:green'><o:p></o:p></span></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;font-family:"Courier New"'> <o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;font-family:"Courier New"'> p3 = fftw_plan_dft_c2r_2d(alto, ancho, U1, u1, FFTW_ESTIMATE|FFTW_PRESERVE_INPUT);<span style='color:green'><o:p></o:p></span></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;font-family:"Courier New"'> p4 = fftw_plan_dft_c2r_2d(alto, ancho, U2, u2, FFTW_ESTIMATE|FFTW_PRESERVE_INPUT);<span style='color:green'><o:p></o:p></span></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;font-family:"Courier New"'> fftw_execute(p3);<span style='color:green'><o:p></o:p></span></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;font-family:"Courier New"'> fftw_execute(p4); <span style='color:green'><o:p></o:p></span></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;font-family:"Courier New"'> fftw_destroy_plan(p3); <span style='color:green'><o:p></o:p></span></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'> fftw_destroy_plan(p4); <span style='color:green'><o:p></o:p></span></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";color:green'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'>Regards<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'>Antonio Gómez Barquero</span><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=ES-TRAD style='font-size:8.0pt;mso-fareast-language:ES'>Ingeniero de Telecomunicaciones -Becario Investigador asociado a Actividades de I+D+I <o:p></o:p></span></p><p class=MsoNormal><span lang=ES-TRAD style='font-size:8.0pt;mso-fareast-language:ES'>GTTS ( Grupo de Tratamiento y Teoría de la Señal)[ </span><span style='font-size:8.0pt;mso-fareast-language:ES'><a href="http://gtts.upct.es/"><span style='color:blue'>http://gtts.upct.es/</span></a></span><span lang=ES-TRAD style='font-size:8.0pt;mso-fareast-language:ES'>]<o:p></o:p></span></p><p class=MsoNormal><span lang=ES-TRAD style='font-size:8.0pt;mso-fareast-language:ES'>UPCT (Universidad Politécnica de Cartagena)[ </span><span style='font-size:8.0pt;mso-fareast-language:ES'><a href="http://www.upct.es/"><span style='color:blue'>http://www.upct.es/</span></a>]</span><span lang=ES-TRAD style='font-size:8.0pt;mso-fareast-language:ES'><o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>