Re: shape factors from tomography images, help needed

Hello Fijoy,

First of all thanks for your answer. I have already written some code
that would segment my series of images based on thresholding. This
way I transfrom each individual image into a binary image. Then I
calculate the total number of pixels that belong to my object by
adding up all the pixels within the object using BWarea for all the
series (V), and then I calculate the surface area of my object by
calculating the pixels in the contour of each image using BWperim and
adding them all up (A). Then I calculate the sphericity using the
formula:

sphericity = ((36piV^2)^(1/3))/A

My problem is that I get valus of sphericity bigger than one, which
doesn't make any sense.

Any suggestions or ideas or what I can be doing wrong?

Cheers,

Dani

Fijoy George wrote:
>
>
> The first step would be to segment the 2D images to identify the
> voxels
> contained in the object. There are programs freely availabe over
> the
> internet which you can download and use. For example
>
> <http://www.mathworks.com/matlabcentral/fileexchange/loadFile.do?objectId=8031>
>
> -Fijoy
>
>
> "Daniel Barrera-Medrano" <danibarrera@xxxxxxxxx> wrote in
message
> news:ef0f343.-1@xxxxxxxxxxxxxxxxxxx
>>I have got a set of 2D x-ray tomography images of a
potato-shaped
>> object. I am interested in calculating the sphericity of this
> object
>> as an indicator of the 3D shape of the object. Any ideas on how
> to do
>> this?
>>
>> For the object I have a set of approx. 400 .bmps that
correspond
> to
>> adjacent cross section of the samples.
>>
>> Any help would be very helpful.
>>
>> Dani
>
>
>
.

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