Re: Fuzzy logic
Michael Sabal wrote:
> Your explanation was quite clear
why thank you, i've been trying to avoid making stream
of conciousness posts, glad it helped :)
>(I didn't even need my old stats textbook --
>I think I sold it anyway :)).
*snicker* sure ya didn't return it to the rental bookstore? ;)
>With that perspective, it seems like a very good
>start to comparing bitmaps
>I still wouldn't put complete faith in a fuzzy logic program
well, it is (imho) a very good start, and you're ever so
very right not to trust it. I'll be the first to admit
that and i'm kinda suprised no one has brought up what
I'm about to say
(been kinda waiting to see if anyone would *wry grin*)
on this topic. The library (as such) or even the concept
does actually have a potentially severe flaw depending
on how or what you are doing.
scenario: you're a police officer, running this program
based upon this library to see if a mug shot of a suspect
(let's say anglo male) is in the database. you scan
the mug shot into the computer and tell the comparison
program to load all photo's of anglo males and find all
near matches.
there is a far higher probability, even if the program is
implemented properly, based upon the way the libary stands
currently, that no pictures will be returned at all, then
there is a probability that the correct picture is returned
amidst several other 'close' matches.
simply put, the library probably will not work for this
scenario.
*gasp*
"well, Hawke', why the f**k did you release something
that's ever so very broke!"
answer: i didn't, technically speaking. the problem lies
in the pictures themselves. the program can determine
matchings based upon pixelXpixel matchings of pixel values.
the dilemma falls into play if the mug shot is *shifted*
(just by one single pixel) in any direction from the
other database images.
JoeBob sits on the cute bench at booking time, getting
his mug shot taken, and JoeBob might sit a wee to the
left on the bench. John Carnal might sit a wee to
the right on the bench.
So even with extreme care taken during the mug shot
picture taking, and extreme care taken during the scanning
of the suspect photo, unless you nail the centering
of the pictures (all the way around) dead on solid pixel
perfect (yeah,right) you will never get a match...
joyous eh? ;)
now, for the situation where you have a static camera taking
pictures of the room, for security, and comparing those
realtime images against a picture of the empty room,
the library will crank, because unless the camera is bumped,
the *shifting* will be 0/nil/nada/zip, and everything is
thusly kosher.
>If you're interested in voice recognition and
>natural language algorithms, I have some snippits
>I still need to add a check...I thought I could shortcut
>Feel free to hack away!
yeah, i might take a lookie-see at dat, see wot's wot...
could be fun :)
--Hawke'
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