Thx
Your addons, labs as well as helpful answers from you and others here in the
forum have moved me well along the road to the solution I need.
It sure is fun to play with these tools and pixels.
I have many a time looked at your fractals before and admired them but I am
better beginning to understand them now.
Viewmat sure is a powerful verb.
2007/2/22, Cliff Reiter <[EMAIL PROTECTED]>:
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
>>
>>
>> ----------------------------------------------------------------------
>> For information about J forums see http://www.jsoftware.com/forums.htm
>>
>
>
>
>
> ------------------------------------------------------------------------
>
> ----------------------------------------------------------------------
> 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
--
Björn Helgason, Verkfræðingur
Fugl&Fiskur ehf, Þerneyjarsund 23, Box 127
801 Grímsnes ,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 í dag |
/ / | Enn betri en gærdagurinn |
( -. | `-----------------------------------'
| ) | (\_ _/)
(`-. '--.) (='.'=)
`. )----' (")_(")
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm
