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Thread Subject:
Sean, How to calculate the length and volume of Eyelash by image data

Subject: Sean, How to calculate the length and volume of Eyelash by image data

From: Song

Date: 4 Nov, 2010 05:09:56

Message: 1 of 4

Sean, or Dear All

I have question about image processing?

How to calculate the length and volume of Eyelash by image data (a
photo of eyelash) ?

http://www.4shared.com/photo/X7HYUXTv/g_online.html

Due to my master degree's project have to write program Matlab about
calculation length and volume of Eyelashes before and after apply
mascara.


so Does anyone know or have some suggestion please tell me.

Best regards

Song

Subject: Sean, How to calculate the length and volume of Eyelash by image data

From: ImageAnalyst

Date: 4 Nov, 2010 10:16:02

Message: 2 of 4

Song:
Just get better images with no shadows, then threshold, skeletonize to
get length, get area, run along the length getting cross sectional
diameters, and calculate volume. Since you're getting your Masters,
it shouldn't be too tough.

If you need an image segmentation demo you can look at mine:
http://www.mathworks.com/matlabcentral/fileexchange/25157

ImageAnalyst

Subject: Sean, How to calculate the length and volume of Eyelash by image data

From: Sean

Date: 4 Nov, 2010 13:55:05

Message: 3 of 4

ImageAnalyst <imageanalyst@mailinator.com> wrote in message <4dfea1ae-a26f-4f84-a2cf-a598b341757f@f8g2000yqn.googlegroups.com>...
> Song:
> Just get better images with no shadows, then threshold, skeletonize to
> get length, get area, run along the length getting cross sectional
> diameters, and calculate volume. Since you're getting your Masters,
> it shouldn't be too tough.
>
> If you need an image segmentation demo you can look at mine:
> http://www.mathworks.com/matlabcentral/fileexchange/25157
>
> ImageAnalyst

First off, you definitely are going to want to try and get better images. This shouldn't be difficult.

I would follow IA's segmentation demo and instructions to learn how this stuff works, then do pretty much exactly what he says in the above instructions:

Once you have a skeleton you're happy with, look at this thread to measure length:
http://www.mathworks.com/matlabcentral/newsreader/view_thread/288187

I also hinted at how you would go about measuring cross sectional width as you traverse. Since your problem doesn't have branch points in should be easy.

%%%%%%
Ps. I just realized that all of these old threads which used drop.io will be invalid after Dec 15th. Arghhh.

Subject: Sean, How to calculate the length and volume of Eyelash by image data

From: Song

Date: 8 Nov, 2010 01:35:43

Message: 4 of 4

On Nov 4, 5:16 pm, ImageAnalyst <imageanal...@mailinator.com> wrote:
> Song:
> Just get better images with no shadows, then threshold, skeletonize to
> get length, get area, run along the length getting cross sectional
> diameters, and calculate volume.  Since you're getting your Masters,
> it shouldn't be too tough.
>
> If you need an image segmentation demo you can look at mine:http://www.mathworks.com/matlabcentral/fileexchange/25157
>
> ImageAnalyst

thank you so much

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