[IPOL discuss] computing and displaying contours

[Juan Cardelino]

Dear Jose Luis,
           Could you send me a copy of the code too?
Thanks in advance.
Best regards,
                  Juan

2011/3/16 José Luis Lisani <joseluis.lisani at uib.es>:
> 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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