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

[Bradley Lowekamp]

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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