[GEM-dev] new pix_colordetect

[Hans-Christoph Steiner]

On Nov 14, 2011, at 12:30 PM, Ricardo Fabbri wrote:

>> i would go for [pix_colorclassify].
>> if you agree and are willing to change the name in your branch, i'll
>> import it as is.
> 
> I agree and have just renamed it and it compiles cleanly here. You can
> fetch the changes in the same 'color' branch.
> 
>> - - it would be great if the user could modify those labels. e.g. [1 0 0]
>> sounds like a great label for "red", but some weird user might chose to
>> prefer [0.5 1 0.8].
> 
> That will come with a later contribution. I wrote a [pix_equal]
> external which can change any pixels "equal" to some value within a
> given cosed r & g & b range. I use it to separate the colors into
> different images, change the color label, etc.

That sounds very useful!  I believe that operation is called a color mask.  Isn't there something like pix_mask?

.hc

>> it would also be nice to be able to parameterize the detection code, but
>> i guess it is too fine tuned to the six given classes (so it would both
>> complicate things from the dev's and the user's povs)
>> 
> 
> I guess we should go with the simple algorithm at first, then improve
> it if needed. I noticed that even with very bad lighting conditions
> and offset colorbalance, at least 2 or 3 colors work robustly, so this
> should be useful without tweaking. The parameters have already been
> tuned on a large database of exemplars. But, I agree, decreasing the
> sensitivity to e.g. 'red' would be nice. I say we wait for further
> demands and beta-testing prior to making the external more complex.
> 
> Thanks!
> 
> Ricardo Fabbri
> labmacambira.sf.net
> 
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