[Insight-users] Re: SV: A question about point cloud

[Luis Ibanez]

Hi Peter,

Projecting a pattern in the surface sounds
like a good idea. You may want to look at the
literature in Active Vision.

I don't quite see why you ask for a point cloud
if you already have a set of points.

Building a mesh, on the other hand, seems to be
a more reasonable target. You may want to look
at the qhull set of utilities on Linux

   http://www.usinglinux.org/math/qhull.html

they can be used for building a mesh out of the
set of points.



   Regards,


      Luis


----------------------------
Peter Stevrin wrote:

> Hi Luis,
> 
> Thank you for answering me.
> 
> Yes I am capturing digital images from a digital video camera, which is
> connected to an otoscope with an optical coupler. As the ear canal is
> rather smooth I have the idea to project a pattern at the surface. 
> 
> I know that it is not easy to go from this sequence of digital video
> images in 2D to build an exact copy of the ear canal and the concha in
> 3D. But I have a research group working for me, saying that they can get
> at least 5000 points at the surface of the ear canal. 
> 
> What I want to know is if you know any software, which can be used to
> build a point cloud or a mesh model from these points.
> 
> I have followed your mailing list and it seems to me to be very active.
> As I am not a technician it is not very much that I understand.
> 
> I look forward to your answer.
> 
> Best regards,
> 
> Peter 
> 
> -----Ursprungligt meddelande-----
> Från: Luis Ibanez [mailto:luis.ibanez at kitware.com] 
> Skickat: den 20 juli 2004 23:20
> Till: Peter.Stevrin at bth.se
> Ämne: Re: A question about point cloud
> 
> 
> Hi Peter,
> 
>  From your description, it looks like you are
> acquiring 2D images from a camera that is inserted
> in the ear canal attached to an otoscope.
> 
> If this is the case, you are mostly in the framework
> of a Computer Vision problem, where you have to extract
> shape from shading and complement that with the tracking
> of your camera.
> 
> Please let me know if I'm interpreting correctly the
> description of your problem.
> 
> 
>     Regards,
> 
> 
>        Luis
> 
> 
> 
> ----------------------
> Peter Stevrin wrote:
> 
> 
>>Hello,
>>
>> 
>>
>>My name is Peter Stevrin and I have a project regarding 3D modelling.
> 
> It 
> 
>>is to make a 3D model of the human ear canal from digital images. The 
>>device used consists of a camera, an adapter, and otoscope. With this 
>>instrument are images captured of the ear canal. This work is done in
> 
> a 
> 
>>hearing clinic. The images are then stored in a computer. Before the 
>>images are sent over Internet to a manufacturer of hearing aids the 
>>images are filtered and compressed. When images arrive to the 
>>manufacturer they are decompressed and filtered. The capturing, 
>>filtering compression and decompression are done with software
> 
> developed 
> 
>>for this application.
>>
>> 
>>
>>The problem that we now must solve is to track the digital images in 
>>order to get a point cloud based on points and coordinates. Do you
> 
> have 
> 
>>a solution to this problem?
>>
>> 
>>
>> 
>>
>>I really look forward to your answer.
>>
>> 
>>
>>Best regards,
>>
>> 
>>
>>Peter Stevrin
>>
>> 
>>
>> 
>>
> 
> 
> 
> 
> 
>