On 6/27/07, jtaber <jtaber@...480...> wrote:

Bob Jamison wrote:
> Bob Jamison wrote:
>
>>>
>>>
>> Well, of course we have something like this already.  It's called SIOX.
>> Its purpose
>> is to extract regions with a similar color signature.
>>
>> http://www.siox.org/
>>
>> If we can apply SIOX to other algorithms, are we inventing something?
>>
>>
>>
>>
> ...which reminds me of something.  A year ago, I promised Hr. Friedland
> that I would make a GUI that would handle the SIOX algorithm properly.
> Is there anyone who needs a task to do that might actually be fun?
>
I've been playing with converting geographical maps using potrace but
have not used siox.

I tried tracing a vidcap frame from Futurama. I wasn't able to get the tracing stuff in inkscape to do a reasonable job at all, and that includes SIOX. It seems to be a hard case for Inkscape because the colors aren't exactly uniform tone over a region due to encoding noise.

There's a lot of applications that can go along
with this - maybe some are more fun than others. Perhaps the biggest
problem when using photos is shading is a different color zone but not
necessarily a different object (ie a road can have different levels of
shading but it still should be identified as the same road).
John

The Manga Colorization paper at Siggraph last year had an interesting technique based on I think Gabor wavelet filters to detect regions of similar pattern in an input image. They probably borrowed the core technique from image processing, but that'd be where I'd start looking for how to handle the roadway case.

--bb