<div>Thank you!</div><div><div><br></div><div style="font-size: 12px;font-family: Arial Narrow;padding:2px 0 2px 0;">------------------ Original ------------------</div><div style="font-size: 12px;background:#efefef;padding:8px;"><div><b>From: </b> "Bradley Lowekamp [via ITK - Users]"<<a href="/user/SendEmail.jtp?type=node&node=31658&i=0" target="_top" rel="nofollow" link="external">[hidden email]</a>>;</div><div><b>Date: </b> Thu, Jun 6, 2013 08:59 PM</div><div><b>To: </b> "zlf"<<a href="/user/SendEmail.jtp?type=node&node=31658&i=1" target="_top" rel="nofollow" link="external">[hidden email]</a>>; <wbr></div><div></div><div><b>Subject: </b> Re: Quickly get the Number of points ofConnectedThresholdImageFilter's output</div></div><div><br></div>
Hello,
<br><br>I appears that you are using WrapITK perhaps in JAVA?
<br><br>You are not going to get good ITK iterator performance in that wrapped environment to perform efficient small operations per pixel. You should try to used existing algorithms and filters.
<br><br><br>You could use the LabelStatisticsImageFilter:
<br><br><a href="http://www.itk.org/Doxygen/html/classitk_1_1LabelStatisticsImageFilter.html" target="_top" rel="nofollow" link="external">http://www.itk.org/Doxygen/html/classitk_1_1LabelStatisticsImageFilter.html</a><br><br>You can use the StatisticsImageFilter:
<br><br><a href="http://www.itk.org/Doxygen/html/classitk_1_1StatisticsImageFilter.html" target="_top" rel="nofollow" link="external">http://www.itk.org/Doxygen/html/classitk_1_1StatisticsImageFilter.html</a><br><br>Or the BinaryImageToStatisticsLabelMapFilter:
<br><br><a href="http://www.itk.org/Doxygen/html/classitk_1_1BinaryImageToStatisticsLabelMapFilter.html" target="_top" rel="nofollow" link="external">http://www.itk.org/Doxygen/html/classitk_1_1BinaryImageToStatisticsLabelMapFilter.html</a><br><br><br><br>On Jun 6, 2013, at 5:19 AM, jerry z <<a href="/user/SendEmail.jtp?type=node&node=31648&i=0" target="_top" rel="nofollow" link="external">[hidden email]</a>> wrote:
<br><div class="shrinkable-quote"><div class='shrinkable-quote'><br>> Hi all,
<br>> I need to know the number of points ConnectedThresholdImageFilter's output
<br>> contains.
<br>>
<br>> I am trying to get that from:
<br>>
<br>> itk.itkImageRegionIterator_ISS3 iterator = new
<br>> itkImageRegionIterator_ISS3(
<br>> connectedThresholdOutput,
<br>> connectedThresholdOutput.LargestPossibleRegion);
<br>>
<br>> int count = 0;
<br>> for (iterator.GoToBegin(); !iterator.IsAtEnd; iterator++)
<br>> {
<br>> short value = iterator.Get().ValueAsSS;
<br>> if (value == 1)
<br>> {
<br>> count++;
<br>> }
<br>> }
<br>>
<br>> But it tooks 2 seconds while ConnectedThresholdImageFilter.GetOutput only
<br>> took 153ms.
<br>> Is there a faster way?
<br>>
<br>> Regards,
<br>>
<br>> Jerry
<br>>
<br>>
<br>>
<br>> --
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