Re: Help watershed oversegmentation

On 27 mai, 18:39, pateheo <phong.pathfin...@xxxxxxxxx> wrote:
Dear Tilman JOCHEMS,

I vote for your QLisp image processing program! Simple & Effective!
It's similar to Matlab but lightweight and more comprehensive
commands. I like it.

I've tested your qLisp code on some teeth images. The result is good
for some images and under-segmentation for some other ones. Anyway,
the idea inside your code really make interested. As you know, X-ray
film contains some over-bright regions which are not teeth. Sometime
gum and teeth can't be separated.

Your method is senvitive to bright artifacts. If there are some
artificial symbols, text or logo,..., on the film, markers will be
absorbed by those artifacts.

In conclusion, I like the way the gum marker is built.

I posted a .rar file contains some processed images.
Link:http://files.filefront.com/Picturesrar/;7621008;/fileinfo.html

Thank you for all. Wait for your reply.

Phong


Hello Phong,

Your images are quite different (orientation and form of teeth,
contrast, zones of saturation, ...). And I am astonished, that my sample
program, which I developed very quickly with 1 picture, gives results
at all. I did point it already out in my last message: my purpose was
not to give you an operational solution but only to show you how to
use the marker based watershed transformation.

I would now work more profound on different subjects: Are there not
better criteria to detect gum? How can one exploit knowledge about the
form of teeth (which I did not use at all)? How can images be pre-
treated - or better: how can acquisition be optimised - to get images
that are comparable? Etc, etc, etc

Good luck,

Tilman JOCHEMS
http://mfj.chez-alice.fr/html/index_en.html

.

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