<div dir="ltr"><div><div><div><div>Dear Ruturaj,<br></div>did you try the filter?<br><br></div>The filter removes objects smaller than a structuring element in the image, which as far as I understand, is your goal.<br><br>
</div>In principle, math morphology filters do not impose any a priori on your object's shape.<br><br></div><div>Otherwise, you can use a filter to label the connected components [1] of your binary image, then count the number of pixels corresponding to a label, and delete some labels/connected components [2] according to a threshold set on the number of pixels. <br>
<br></div><div>HTH,<br></div>JON HAITZ<br><br>[1] <a href="http://www.itk.org/Doxygen/html/classitk_1_1BinaryImageToLabelMapFilter.html">http://www.itk.org/Doxygen/html/classitk_1_1BinaryImageToLabelMapFilter.html</a><br>
[2] <a href="http://www.itk.org/Wiki/ITK/Examples/ImageProcessing/ManuallyRemovingLabels">http://www.itk.org/Wiki/ITK/Examples/ImageProcessing/ManuallyRemovingLabels</a><br><div><div><br><br><div><div><div><div><div><div>
<div><div class="gmail_extra"><br><div class="gmail_quote">On 20 May 2014 10:48, Girish, Gavaskar Ruturaj <span dir="ltr"><<a href="mailto:gavaskar.ruturaj.girish@philips.com" target="_blank">gavaskar.ruturaj.girish@philips.com</a>></span> wrote:<br>
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<p class="MsoNormal"><span style="font-size:11pt;font-family:"Calibri","sans-serif";color:rgb(31,73,125)">Dear Jon,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:"Calibri","sans-serif";color:rgb(31,73,125)">Thanks for your reply. I am looking for a filter which will remove all white objects containing less than a specified number of pixels, regardless of their
shape. I am not sure if morphological operations, which the filters you mentioned are using, will be fully successful as the result will also depend on the objects’ shape. Is there a way to ‘threshold’ objects based on their size (no. of pixels), possibly
even involving multiple filters?<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:"Calibri","sans-serif";color:rgb(31,73,125)">Thanks & Regards,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:"Calibri","sans-serif";color:rgb(31,73,125)">Ruturaj<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:"Calibri","sans-serif";color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><b><span style="font-size:10pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10pt;font-family:"Tahoma","sans-serif""> Jon Haitz Legarreta [mailto:<a href="mailto:jhlegarreta@vicomtech.org" target="_blank">jhlegarreta@vicomtech.org</a>]
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<b>Sent:</b> Tuesday, May 20, 2014 2:06 PM<br>
<b>To:</b> Girish, Gavaskar Ruturaj<br>
<b>Cc:</b> <a href="mailto:community@itk.org" target="_blank">community@itk.org</a><br>
<b>Subject:</b> Re: [ITK] MATLAB bwareaopen() equivalent in ITK<u></u><u></u></span></p><div><div class="h5">
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<p class="MsoNormal">Dear Ruturaj,<u></u><u></u></p>
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<p class="MsoNormal" style="margin-bottom:12pt">binary math morphology filters [1] will be of help for this task. The itk::BinaryOpeningByReconstructionImageFilter [2] is probably the filter you are looking for.<u></u><u></u></p>
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<p class="MsoNormal">HTH,<br>
JON HAITZ<u></u><u></u></p>
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[1] <a href="http://www.itk.org/Doxygen/html/group__ITKBinaryMathematicalMorphology.html" target="_blank">
http://www.itk.org/Doxygen/html/group__ITKBinaryMathematicalMorphology.html</a><br>
[2] <a href="http://www.itk.org/Doxygen/html/classitk_1_1BinaryOpeningByReconstructionImageFilter.html" target="_blank">
http://www.itk.org/Doxygen/html/classitk_1_1BinaryOpeningByReconstructionImageFilter.html</a><u></u><u></u></p>
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<p class="MsoNormal" style="margin-bottom:12pt"><u></u> <u></u></p>
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<p class="MsoNormal">On 20 May 2014 10:09, Girish, Gavaskar Ruturaj <<a href="mailto:gavaskar.ruturaj.girish@philips.com" target="_blank">gavaskar.ruturaj.girish@philips.com</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal">Dear all,<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">Is there a class in ITK which provides functionality to remove small white objects in a binary image, similar to the function
<span style="font-family:"Courier New"">bwareaopen()</span> in MATLAB? If not, how can this be done?<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">Thanks & Regards,<u></u><u></u></p>
<p class="MsoNormal">Ruturaj<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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