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</o:shapelayout></xml><![endif]--></head><body lang=DE link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Hi to everyone,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=EN-US>could someone recommend me a class for fast calculation of the histogram from a 3d data set?<br><br><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Right know we use vtkImageAccumulate. But it takes up a lot of time. The data sets are several gigabytes big.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US>I tried ScalarImageToHistogramGenerator and ImageToHistogramFilter (with </span><span lang=EN-US style='font-size:9.5pt;font-family:Consolas'>HistogramType::SizeType size(1); </span><span lang=EN-US>).<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US>ScalarImageToHistogramGenerator is slower than ImageToHistogramFilter. And both are slower than vtkImageAccumulate.<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-US>The results are below (in ms):<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>VoxelCount: 1052494100, DataType: unsigned short, Min value 0, Max value 65535, Bins 1024<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Time for calculating histogram (VTK) 17498<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Time for calculating histogram (ITK) 62093<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Time for calculating histogram (ITK scalar) 111687<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Thanks in Advance,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Arial","sans-serif";mso-fareast-language:DE'>Mustafa Arikan<b><br>FH OÖ Forschungs- & Entwicklungs GmbH<br></b>Stelzhamerstraße 23 <br>4600 Wels / Austria<br>Tel: +43 (0)50804-44407<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:8.0pt;font-family:"Arial","sans-serif";mso-fareast-language:DE'>E-Mail: M</span><span style='font-size:8.0pt;font-family:"Arial","sans-serif";mso-fareast-language:DE'>ustafa.Arikan@fh-wels.at<o:p></o:p></span></p><p class=MsoNormal style='margin-bottom:12.0pt'><span lang=DE-AT style='font-size:8.0pt;font-family:"Arial","sans-serif";mso-fareast-language:DE'>Web: www.3dct.at</span><span style='font-size:8.0pt;font-family:"Arial","sans-serif";mso-fareast-language:DE'><o:p></o:p></span></p><p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:8.0pt;mso-fareast-language:DE'><img width=275 height=41 id="Bild_x0020_1" src="cid:image001.png@01CE5179.F222E970" alt="iCT_E-mail_Banner-2014_FINAL"></span><span lang=DE-AT style='mso-fareast-language:DE'><o:p></o:p></span></p><p class=MsoNormal><a href="http://www.fh-ooe.at/"><span style='font-size:8.0pt;font-family:"Arial","sans-serif";color:windowtext;mso-fareast-language:DE;text-decoration:none'><img border=0 width=275 height=41 id="Bild_x0020_2" src="cid:image002.jpg@01CE5179.F222E970" alt="Studieren probieren 16 11 2012"></span></a><span style='font-size:8.0pt;font-family:"Arial","sans-serif";mso-fareast-language:DE'><o:p></o:p></span></p><p class=MsoNormal><span lang=DE-AT style='font-size:8.0pt;font-family:"Arial","sans-serif";color:gray;mso-fareast-language:DE'>Firmenbuchgericht/Court of registry: Landesgericht Wels</span><span style='font-size:8.0pt;font-family:"Arial","sans-serif";mso-fareast-language:DE'><o:p></o:p></span></p><p class=MsoNormal><span lang=DE-AT style='font-size:8.0pt;font-family:"Arial","sans-serif";color:gray;mso-fareast-language:DE'>Firmenbuchnummer/Company registration: FN 236733 m</span><span style='font-size:8.0pt;font-family:"Arial","sans-serif";mso-fareast-language:DE'><o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>