[IPOL discuss] computing and displaying contours

[José Luis Lisani]

Hi Pascal,

I think I will have some time to work on the code and demo in 2 weeks.
In fact, the code is written, I just have to clean it up
and come up with a online demo.
If you want to take a look at the code I can send it to you right now.

Best,
José Luis



El 16/03/2011 9:48, Pascal Monasse escribió:
> Hi Jose Luis,
> Yes, this was also on my todo list when I get some available time (in 10
> days). If you have some code for that, it would help jumpstart the project.
> This would be an IPOL submission by itself, and it would also be used in the
> image curvature microscope.
> Best,
> Pascal
>
> On Tuesday, March 15, 2011 06:18:09 pm Jean-Michel Morel wrote:
>> José Luis,
>>
>> This sounds great. Pascal Monasse and Adina Ciomaga also need it
>> "urgently".
>>
>> Best,
>> JM
>>
>> José Luis Lisani a écrit :
>>> Dear all,
>>>
>>> I have a C++ code for computing and drawing level lines from a
>>> bilinearly interpolated
>>> version of the image:
>>> http://www.cmla.ens-cachan.fr/fileadmin/Documentation/Prepublications/200
>>> 1/CMLA2001-16.ps.gz
>>>
>>>
>>> I had planned to publish the code at IPOL, on an undefined date.
>>> But, if there is a real need for the code I can accelerate my plans. I
>>> think I can
>>> have something running in a month or so.
>>> Once the code has been certified by IPOL it could become part of the
>>> tools made available to the rest of authors.
>>>
>>> Best regards,
>>> José Luis
>>>
>>> El 15/03/2011 17:38, Juan Cardelino escribió:
>>>> Dear all,
>>>>
>>>>             I remember that we discussed the topic of visualization in
>>>>
>>>> the september meeting. I'm not sure if you have advanced in that
>>>> direction in January, if that's the case, please update me.
>>>> So far I contributed in demos for me and for people that were also in
>>>> IPOL. I'm facing the first case of helping a non-member of the crew,
>>>> and I have some doubts about were to draw the line of what's
>>>> responsibility of the author and what's the task of the editor.
>>>>
>>>> The case is the following: the author is Mauricio Delbracio and his
>>>> algorithm that estimates a PSF, so the output are regular samples of a
>>>> 2D function. When thinking about visualization, the wanted to display
>>>> the level lines of that function. This involves a couple of tasks:
>>>>
>>>> 1) actually computing the contours:
>>>> a) I think this should be done by the author
>>>> b) however, it won't hurt to have a handful of simple functions at
>>>> hand, to provide the authors. Maybe we can just reuse the code done by
>>>> the first autor interested in doing the task.
>>>> c) I think about many cases in which we could be interested in
>>>> computing/showing level lines, so maybe the definition of an interface
>>>> (how to specify the points of the contour) could be useful.
>>>> d) I google'd for a bit to find any clean C implementation of the
>>>> marching squares algorithm but without luck. do you know/have any
>>>> piece of C code to compute contours? I know implementations in ITK and
>>>> VTK, but that's out of the question. I find sad that there is no
>>>> reference implementation of such well-know and established algorithms.
>>>>
>>>> 2) drawing the contours on the web page:
>>>> a) the first ugly way to do this is to just ask the author for an
>>>> image with white pixels over a black background. I think this is
>>>> efortless but poses many problems (low resolution, no scaling, etc).
>>>> b) Ask the user to draw in a vectorial format like eps or svg. As far
>>>> as I know, svg support varies too much across browsers. (correct me
>>>> please if I'm wrong)
>>>> c) ask the author for a description of the curve as in 1c) and render
>>>> it using javascript of whatever we like. Here we need a precise
>>>> definition of the curve, as I guess we don't want to recode that part
>>>> for each new demo.
>>>> d) I think in general this should be our concern, not the authors.
>>>>
>>>> Personally, I would go for the svg, but sadly technology is not on our
>>>> side yet.
>>>> What do you think? Is there any hack to make an svg look the same in
>>>> different browsers?
>>>>
>>>> Thanks in advance.
>>>> Best regards,
>>>>
>>>>                     Juan
>>>>
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