Hi Björn,
If reading a pixel location is desired, you can load the view_m.ijs
script from image3, run
viewimage_win_mbldown=: 3 : 'smoutput 2{.". sysdata'
then load an image with view_image and when you click
on the image, pixel location will be output to the J session.
Of course, this is a primitive interface that could be
modified to your needs.
Playing with pixels is fun, and chap 8 in fvj3 has some good
stuff, and you have gotten other good advice in the forum,
but you can also find interesting things within the addon.
The lines at the end of the view_m.ijs script com to mind;
but also the color space script comes to mind;
a preprint (presuming you don't have easy access to quote quad)
of the Quote Quad article on color spaces is available from
http://ww2.lafayette.edu/~reiterc/j/withj/withj14_im_proc02_pp.pdf
of less interest, filters:
http://ww2.lafayette.edu/~reiterc/j/withj/withj12_im_proc01_pp.pdf
(apparently my web page links to these aren't the easiest to
find -- onto my todo list).
Best
Cliff
Björn Helgason wrote:
I downloaded this just now and paged through the labs.
It looks very nice and very impressive.
I do not much about working with images.
I do have an assignment to work with .bmp images and locate an
instrument in
a phantom.
That is a a transparent phantom with four holes around the edges and one in
the center.
It is round like a clock.
On the .bmp image I can clearly see the black spot where the instrument is
with the phantom white or rather gray around it.
Around the phantom there is black also.
I have opened it with transform image and viewimage as well as with
viewbmp
and it looks ok visually but how to operate on it with programs to find the
spots I do not know how to do.
I need to find with J where the phantom is located in the image and then
find the black spot inside the phantom.
getting the x,y coordinates of the leftmost, right, top and bottom of the
phantom would be ideal and similarly getting the x,y coordinate of the
black
spot inside the phantom circle.
Can someone point me in a direction how to perform reading like that from a
.bmp image - preferably with with J tools?
This may be dead easy but for me at the moment it is not.
I am told people do this with Matlab all the time but I rather try out with
J if at all possible.
2007/1/17, Cliff Reiter <[EMAIL PROTECTED]>:
Just a note that the image3 addon has been updated for J6.01 and
is available from the wiki jsoftware pages. Directory changed to
~addons/media/image3
Help files for the addon are at
http://ww2.lafayette.edu/~reiterc/j/image3help/index.html
if you want to know what the addon does.
Also, a new addon has been added that depends upon the image3;
The fvj3 addon
~addons/graphics/fvj3
It is primarily meant to provide scripts and materials for the 3rd
edition of Fractals visualization and J (coming soon),
but the addon may be of use in its own right, and there are
several labs, designed to explore the scripts (not book teasers).
But I have to add a tease since I added a script to the fvj3 addon
that can be used to replace missing image data (bafrmid.ijs) and
running the corresponding lab is kind of amusing.
An illustration of what "replacing missing image data" means can
be seen at
http://ww2.lafayette.edu/~reiterc/mvq/bafrmid/index.html
J is cool.
Best,
Cliff
--
Clifford A. Reiter
Mathematics Department, Lafayette College
Easton, PA 18042 USA, 610-330-5277
http://www.lafayette.edu/~reiterc
----------------------------------------------------------------------
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------------------------------------------------------------------------
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm
--
Clifford A. Reiter
Mathematics Department, Lafayette College
Easton, PA 18042 USA, 610-330-5277
http://www.lafayette.edu/~reiterc
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm
