[ITK Community] [Insight-users] Automatically finding spheres in 3D images

Bill Lorensen bill.lorensen at gmail.com
Wed Dec 18 15:50:16 EST 2013


I think the section title is a bit overzealous...


On Wed, Dec 18, 2013 at 12:01 PM, Bradley Lowekamp <brad at lowekamp.net> wrote:
> Bill,
>
> What is there (example/filter) that you would consider "Blob detection"?
>
> Brad
>
> On Dec 18, 2013, at 11:50 AM, Bill Lorensen <bill.lorensen at gmail.com> wrote:
>
>> David,
>>
>> This section in the ITK Wiki Examples:
>>
>> Blob Detection, Labeling, and Properties
>> http://itk.org/Wiki/ITK/Examples#Blob_Detection.2C_Labeling.2C_and_Properties
>> may be useful. In particular: ShapeAttributes
>> http://itk.org/Wiki/ITK/Examples/ImageProcessing/ShapeAttributes
>> runs connected components on a binary image, converts it to a LabelMap
>> and prints lots of statistics. The Elongation parameter is the  ratio
>> of the largest principal moment to the second largest principal
>> moment. Its value is greater or equal to 1.
>>
>> On Wed, Dec 18, 2013 at 10:18 AM, Bill Lorensen <bill.lorensen at gmail.com> wrote:
>>> If you already have segmented the objects, look at Filtering/LabelMap.
>>> Look at the test: LabelMap/test/itkShapeLabelObjectAccessorsTest1.cxx
>>>
>>>
>>>
>>> On Wed, Dec 18, 2013 at 9:10 AM, Bradley Lowekamp <brad at lowekamp.net> wrote:
>>>> Ohh, yeah there are morphology techniques too.
>>>>
>>>> I believe the top-hat[1][2] filter can also be very useful for detecting dark/black spots smaller the the structuring element.
>>>>
>>>> [1] http://www.itk.org/Doxygen/html/classitk_1_1BlackTopHatImageFilter.html
>>>> [2] http://www.itk.org/Doxygen/html/classitk_1_1WhiteTopHatImageFilter.html
>>>>
>>>> On Dec 18, 2013, at 9:05 AM, Matt McCormick <matt.mccormick at kitware.com> wrote:
>>>>
>>>>> Hi Dave,
>>>>>
>>>>> Binary morphological opening [1] may work well.  See, for example [2].
>>>>>
>>>>> Hope this helps,
>>>>> Matt
>>>>>
>>>>> [1] http://itk.org/Doxygen/html/classitk_1_1BinaryMorphologicalOpeningImageFilter.html
>>>>> [2] http://homepages.inf.ed.ac.uk/rbf/HIPR2/open.htm
>>>>>
>>>>> On Wed, Dec 18, 2013 at 8:57 AM, David Cole <dlrdave at aol.com> wrote:
>>>>>>> Have you tried Hough transforms?
>>>>>>>
>>>>>>>
>>>>>> http://www.itk.org/Doxygen/html/classitk_1_1HoughTransform2DCirclesImageFilter.html
>>>>>>
>>>>>>
>>>>>> Not yet, but I will now, thanks very much!
>>>>>>
>>>>>>
>>>>>> D
>>>>>>
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>



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