[Insight-users] How to create a set of spatially distributed images

[Ali -]

Gaetan,
 
Is there an example to show how to map spatial objects to an image? Examples/SpatialObjects/GaussianSpatialObject.cxx only creates the gaussian object, how is it possible to show it in an image?
> > > Hi,> > Have you tried to generate your image with some itk::GaussianSpatialObject > ?> > Regards,> > Gaetan> > On Mon, 08 Jan 2007 13:25:51 +0100, Christian Marshall Rieck > <rieck at stud.ntnu.no> wrote:> > >> Thanks for the reply, I am NOT avoiding the overlapping -- I just want> >> the particle-images to be overlapped naturally. That is, at each> >> overlapping region, the pixel values of one of the particle-images must> >> overwrite (NOT be added to) the pixel values of the other > >> particle-image.> >> Pasting does the job, however, it also overwrites the black background > >> of> >> each square-shaped particle-image (notice the square edges in the> >> overlapping areas in the sample> >> http://img81.imageshack.us/my.php?image=testyz7.png).> >> > In that case I dont know. Some guesses:> > *See if you can set the black border to a transparent color> > *Edit the pasting function to paste the pixels inside a cirle, leaving > > out> > the black corners/borders of the little images> > *As you are outputing PNG-files, can you create an int[][] and save> > this to a PNG-file in software outside ITK? There must be libraries for> > this. In this case you can have a function to return one of your little> > images/circles in a 10x10 matrix and specify which pixels should be > > copied> > to the array.> >> > Or you could wait until some of the nice people on this list with better> > programming skills than me answer your question :)> >> > chr.> >> >> >> > > I am trying to simulate an image like this:> > > > > >> http://ftp.sv.vt.edu/pub/projects97/pvlachos/pvlachos_project/images/piv.gif> > >> > > > I started with creating small sized GaussianImageSource instances > >> and pasting them at random positions on a background using > >> PasteImageFilter. The problem is when two GaussianImageSource overlap > >> as it can be seen in thios sample: > >> http://img81.imageshack.us/my.php?image=testyz7.png> > > > (2) If not, > >> how to get rid of the ovelaping problem?> > First thing that fell into > >> my head:> You could > instantiate an int/bool array[][] img with your > >> image size. Everytime you > paste to some location (x,y) you set > >> img[x][y] = 1/true. (also set all > pixels covered by this image). Next > >> time you want to paste to the image > check the pixels you are going to > >> paste into to se if there is an image > there alredy. If there is, > >> choose a new one.> > As the number of places a new image fits in the > >> larger image the > while(find_a_suitable_place) loop may take some > >> time. I am sure you can > come up with something clever to speed this > >> up.> > Example: > If your small images are 10x10 and you past to (0,0) > >> you set > img[0..10][0..10] = 1. > If you try to paste the next small > >> image to (2,2) (i guess you use a > random-function for this) you check > >> img[2..12][2..12]. Since these are not > 0 you must search for a new > >> location.> > Christian.>> >> _________________________________________________________________> >> Be one of the first to try Windows Live Mail.> >> http://ideas.live.com/programpage.aspx?versionId=5d21c51a-b161-4314-9b0e-4911fb2b2e6d> > > > -- > Gaëtan Lehmann> Biologie du Développement et de la Reproduction> INRA de Jouy-en-Josas (France)> tel: +33 1 34 65 29 66 fax: 01 34 65 29 09> http://voxel.jouy.inra.fr
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