I have heard that Matlab has a lot of tools to handle images
The question if is such toolboxes from Matlab or other programming
environments could be combined with J?
How would you make this simple tool to align images in J?
I am beginning to look at Cliffs tools
Looks interesting as I expected
2006/11/4, Oleg Kobchenko <[EMAIL PROTECTED]>:
Ideally, there should be a tool in J to align images.
(In fact it's quite simple.)
But to experiment, I recommend a good photo editor,
PhotoShop :-) is easy, but Gimp should do it too:
- put the two pictures in two layers of one image
- set the top layer transparency to see through
- choose "Move Tool", which allows to shift and rotate the layer
- save the layers separately into new picture files
It's better to work with either a subset or
a scaled down version of the images, 1024x1024 or so,
while you work out the technique.
There is a good intro into image cleanup filters
by Cliff Reiter in APL Quote Quad.
See also his web site for the scritps.
Note: some amount of noise and intesity variations
are controled by the level of threshhold.
--- Björn Helgason <[EMAIL PROTECTED]> wrote:
> I have been making some manual work in aligning the pictures
> Take easily recognizable parts of the picture to compare
> I have noticed that I have to move one picture a bit to the right and up
> which is relatively easy looking at the results with viewrgb and picking
> different indexes to move them along
> It is good fun to play with pictures this way
>
> There is quite a bit of noise on the pictures
>
> To get the patterns aligned may also need a bit of turnings as well
which is
> a bit harder to do
>
> I wonder if there are any tools to do such pattern matching
automatically
>
> Also something to smooth out noise and make the patterns stand out
better
>
>
> 2006/11/2, Oleg Kobchenko <[EMAIL PROTECTED]>:
> >
> > There may be different techniques depending on
> > the goals of the comparison and conditions of
> > input images, such as
> > - alignment and "exposure" transformations to match two images
> > - processing for easy visual identification of diffs
> >
> > E.g. for visual identification, that will show one
> > of the images with differences area highlighted
> > - make sure images align (can be manual visual tool)
> > - get difference
> > - get 0,1 bitmap as threshhold of the difference image
> > - apply some visible filter using the bitmap mask,
> > such as elevate R and suppress G,B
> > f(r,g,b) = (r+m*d),(g-m*d),(b-m*d); m={0,1}, d=10 or so
> >
> > For automated qualitative analysis, there is
> > a good summary of image operations
> > http://homepages.inf.ed.ac.uk/rbf/HIPR2/
> >
> > platimg returns image in hex 0xRRGGBB form, and
> > most of the operations work on each color component
> > separately.
> >
> >
> > --- Björn Helgason <[EMAIL PROTECTED]> wrote:
> >
> > > I downloaded platimg from
> > >
> > > http://olegykj.sourceforge.net/
> > >
> > > I ran the test script and could take in my jpg picture and display
part
> > of
> > > it on the form
> > > (excellent tools on this page!!)
> > >
> > > I am pretty new to this picture scene and I wonder if there are
tools
> > > available to scale the jpg images as well as compare differences
between
> > jpg
> > > pictures
> > > Like I have 15 pictures taken of the same object but there are
> > supposedly
> > > small differences between them that I do not know about
> > > Each is 6MB in size
> > >
> > > Getting the picture displayed is a major step for me but I have not
got
> > a
> > > clue as to how to compare them in J and what to do next
> > >
> > > --
> > > Björn Helgason, Verkfræðingur
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--
Björn Helgason, Verkfræðingur
Fugl&Fiskur ehf, Þerneyjarsund 23, Box 127
801 Grímsnes ,t-póst: [EMAIL PROTECTED]
Skype: gosiminn, gsm: +3546985532
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