It is getting tricky not to use JAL found this line giving file name error require 'media/platimg/',tolower UNAME
change to require '~addons/media/platimg/',(tolower UNAME),'.ijs' and by the way debug is very good. Have not tried it out in a very long time until now I needed to chase missing file names 2007/2/22, Oleg Kobchenko <[EMAIL PROTECTED]>:
Convolution and kernel are just other names for kern&u;.3 which I used to help you google. Here's a quick process load 'media/platimg viewamt' NB. using JAL img=: 125<16bff bAND readimg 'testdcm.bmp' NB. image threshold viewrgb 16bffffff * img NB. NOTE: viewrgb preserves image size NB. copy window and paste to Paint and cut out 24x24 kernel NB. of the feature and save as kern.bmp NB. kern=: 0~:16bff bAND readimg 'kern.bmp' NB. Here it is done for you kern=: #:,".;._2 (0 : 0) 16777215 16777215 16777215 16777215 16777215 16774143 16760959 16744511 16711743 16646175 16646175 16653855 16653855 16649247 16646175 16711743 16744575 16761087 16777215 16777215 16777215 16777215 16777215 16777215 ) viewrgb 16bffffff * kern NB. here is the coordinates of the feature in the image NB. i.e. convolution of img with kernel kern and operation +/@,@:= ($ #: (i. >./)@,) (1 1,:$kern) (kern +/@,@:= ]);._3 img 249 236 load 'plot' 'surface; mesh 0' plot (1 1,:$kern) (kern +/@,@:= ]);._3 img --- Björn Helgason <[EMAIL PROTECTED]> wrote: > Wow! > > This is a big help - thanks! > > This looks good! > viewmat 125<16bff bAND readimg 'testdcm.bmp' > > I do not understand much of the rest > I will have to try out and read more about such things > > If I understand you correctly then I should read the matrix piece by piece > in something like 24 rows and 24 columns at a time and look for the max > within those steps using +/@,@:= > > What is the FVJ book and where can I find it? > > > > > 2007/2/22, Oleg Kobchenko <[EMAIL PROTECTED]>: > > > > A couple of ideas: > > > > Find a threshhold of the image so that it > > makes good picture of the feature (the dot). > > > > (<./ , >./),16bff bAND readimg 'testdcm.bmp' > > 120 129 > > viewmat 125<16bff bAND readimg 'testdcm.bmp' > > > > Then apply convolution with a kernel that is > > a copy of the feature with neighborhood of the > > size of the feature in all directions, e.g. if dot is > > 8x8, use 24x24 kernel; and a matching function, > > e.g. dyadic +/@,@:= then the max of the convolution > > will be the sought point. > > > > And the FVJ book is an excelent resource. > > > > > > --- Björn Helgason <[EMAIL PROTECTED]> 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 > > > > > > > > > > > > ____________________________________________________________________________________ > > Don't pick lemons. > > See all the new 2007 cars at Yahoo! Autos. > > http://autos.yahoo.com/new_cars.html > > ---------------------------------------------------------------------- > > 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 ____________________________________________________________________________________ Don't get soaked. Take a quick peak at the forecast with the Yahoo! Search weather shortcut. http://tools.search.yahoo.com/shortcuts/#loc_weather ---------------------------------------------------------------------- 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
