I tried to run this set of data through Dendrite
cluster analysis to filter the error results and
got a new average of 327.75 363.5.
See details in the "Error Filter" topic at
http://www.jsoftware.com/jwiki/Essays/Dendrite/Applications
--- Bj�rn Helgason <[EMAIL PROTECTED]> wrote:
> I accidentally divided by 5 instead of 6 but that does not change the
> question
>
>
>
> a=.328 364;127 478;159 1;328 363;327 365;328 362
> 6%~+/>a
> 266.167 322.167 NB. correct answer should be 328 363
>
>
> a=.247 235;0 0;244 433;129 304;246 236;291 48
> 6%~+/>a
> 192.833 209.333 NB. correct answer should be 247 235
>
>
> 2007/3/15, Björn Helgason <[EMAIL PROTECTED]>:
> >
> > Lets say I use different methods to find the point and the correct answer
> > should be 328 363
> >
> > Even if the majority are correct or close to it the mean may not be a good
> > answer
> >
> >
> > a=.328 364;127 478;159 1;328 363;327 365;328 362
> > 5%~+/>a
> > 319.4 386.6
> >
> > Any suggestions to get a better approximation?
> >
> > 2007/3/15, Björn Helgason < [EMAIL PROTECTED]>:
> > >
> > > I am trying different sizes of the kern and different filters.
> > >
> > > I created a form to show the images and different filtering and various
> > > results of finding the object.
> > > I try it out with finding patterns equal to different numbers and
> > > combinations of numbers as well as the actual kern without filter.
> > >
> > > It takes time to do the manual checking to see what settings give best
> > > results and are accurate.
> > >
> > >
> > > 2007/3/14, Oleg Kobchenko < [EMAIL PROTECTED] >:
> > > >
> > > > The listed image formats should not produce any
> > > > difference since they all are lossless compressions.
> > > > You can verify creating images in different formats,
> > > > loading in J and then subtracting the values.
> > > >
> > > > Regarding image recognition, although the simple difference minimum
> > > > method may work, it is not very stable and depends on
> > > > accuracy of defining the kernel and the chosen threshold,
> > > > which is different for every instance.
> > > >
> > > > It would be nice to see how other methods fair,
> > > > such as cross-correlation, as listed by Devon McCormick
> > > >
> > > > http://www.jsoftware.com/pipermail/general/2007-March/029123.html
> > > >
> > > > You can go iteratively, tweaking a working algorithm
> > > > with different ideas to see what's improving.
> > > > For example, I like the idea of normalization (first link)
> > > >
> > > > http://www.owlnet.rice.edu/~elec431/projects96/pictomaniacs/previous.html
> > > > <http://www.owlnet.rice.edu/%7Eelec431/projects96/pictomaniacs/previous.html>
> > > >
> > > > You can apply it to the method you use now to see if it will
> > > > eliminate the mismatch.
> > > >
> > > >
> > > > --- Bj�rn Helgason < [EMAIL PROTECTED]> wrote:
> > > >
> > > > > When extracting an image to work with from a Dicom file I have three
> > > > options
> > > > >
> > > > > dcm2pnm - Convert DICOM images to PPM/PGM, PNG, TIFF or BMP
> > > > >
> > > > > +obt --write-24-bit-bmp
> > > > > write 24-bit truecolor BMP
> > > > >
> > > > > +ot --write-tiff
> > > > > write 8-bit (monochrome) or 24-bit (color) TIFF
> > > > >
> > > > > +on --write-png
> > > > > write 8-bit (monochrome) or 24-bit (color) PNG
> > > > >
> > > > >
> > > > > I have up to now used bmp and am reasonably happy with the results.
> > > > >
> > > > > I am wondering if the other forms TIFF or PNG would give me better
> > > > results.
> > > > > Would I need different technique to find the object I am looking for
> > > > in the
> > > > > image?
> > > > >
> > > > > The method Oleg sent in earlier finds the object most of the time in
> > > > the BMP
> > > > > images.
> > > > > Actually only found one image so far where it missed the object and
> > > > gave
> > > > > another fairly similar looking location.
> > > >
> > > >
> > > >
> > > >
> > > > ____________________________________________________________________________________
> > > >
> > > > We won't tell. Get more on shows you hate to love
> > > > (and love to hate): Yahoo! TV's Guilty Pleasures list.
> > > > http://tv.yahoo.com/collections/265
> > > > ----------------------------------------------------------------------
> > > >
> > > > For information about J forums see http://www.jsoftware.com/forums.htm
> > > >
> > >
> > >
> > >
> > > --
> > > Björn Helgason, Verkfræðingur
> > > Fugl&Fiskur ehf, Ãerneyjarsund 23, Box 127
> > > 801 GrÃmsnes ,t-póst: [EMAIL PROTECTED]
> > > Skype: gosiminn, gsm: +3546985532
> > > Landslags og skrúðgarðagerð, gröfuþjónusta
> > > http://groups.google.com/group/J-Programming
> > >
> > >
> > > Tæknikunnátta höndlar hið flókna, sköpunargáfa er meistari
> > > einfaldleikans
> > >
> > > góður kennari getur stigið á tær án þess að glansinn fari af
> > > skónum
> > > /|_ .-----------------------------------.
> > > ,' .\ / | Með léttri lund verður |
> > > ,--' _,' | Dagurinn à dag |
> > > / / | Enn betri en gærdagurinn |
> > > ( -. | `-----------------------------------'
> > > | ) | (\_ _/)
> > > (`-. '--.) (='.'=)
> > > `. )----' (")_(")
> > >
> >
> >
> >
> > --
> > Björn Helgason, Verkfræðingur
> > Fugl&Fiskur ehf, Ãerneyjarsund 23, Box 127
> > 801 GrÃmsnes ,t-póst: [EMAIL PROTECTED]
> > Skype: gosiminn, gsm: +3546985532
> > Landslags og skrúðgarðagerð, gröfuþjónusta
> > http://groups.google.com/group/J-Programming
> >
> >
> > Tæknikunnátta höndlar hið flókna, sköpunargáfa er meistari
> > einfaldleikans
> >
> > góður kennari getur stigið á tær án þess að glansinn fari af skónum
> > /|_ .-----------------------------------.
> > ,' .\ / | Með léttri lund verður |
> > ,--' _,' | Dagurinn à dag |
> > / / | Enn betri en gærdagurinn |
> > ( -. | `-----------------------------------'
> > | ) | (\_ _/)
> > (`-. '--.) (='.'=)
> > `. )----' (")_(")
> >
>
>
>
> --
> Björn Helgason, Verkfræðingur
> Fugl&Fiskur ehf, Ãerneyjarsund 23, Box 127
> 801 GrÃmsnes ,t-póst: [EMAIL PROTECTED]
> Skype: gosiminn, gsm: +3546985532
> Landslags og skrúðgarðagerð, gröfuþjónusta
> http://groups.google.com/group/J-Programming
>
>
> Tæknikunnátta höndlar hið flókna, sköpunargáfa er meistari
> einfaldleikans
>
> góður kennari getur stigið á tær án þess að glansinn fari af skónum
> /|_ .-----------------------------------.
> ,' .\ / | Með léttri lund verður |
> ,--' _,' | Dagurinn à dag |
> / / | Enn betri en gærdagurinn |
> ( -. | `-----------------------------------'
> | ) | (\_ _/)
> (`-. '--.) (='.'=)
> `. )----' (")_(")
> > ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
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