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

[Gaetan Lehmann]

On Mon, 08 Jan 2007 14:25:50 +0100, Ali - <saveez at hotmail.com> wrote:

> 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?

you can use itk::SpatialObjectToImageFilter
You'll find a great amount of doc about spatial objects in the ITK  
Software Guide (http://www.itk.org/ItkSoftwareGuide.pdf)

Please let us know if it works for you

Gaetan



>> > > 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.>> >>  
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>> Reproduction> INRA de Jouy-en-Josas (France)> tel: +33 1 34 65 29 66  
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-- 
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