Dear Guillermo,
there are a number of ways you can create your images from the N-image
stack.
If you want a series of individual images, you could do something like this
for (my $ii (0..$imn->dim(3)-1)) { $im(,,,$ii;-)->wpic("image_$ii.png"); }
If you want to combine the stack, a mip can be created by
$imn->reduce('maximum',3);
or
$imn->mv(3,0)->maximum;
You can do 'average','medover','sumover', etc. instead of 'maximum',
depending on what you want. There are many aggregate functions available.
I hope this helps.
Best,
Ingo
On 24.10.24 5:52 PM, Guillermo P. Ortiz wrote:
Hello again, thanks to Ed for show me a typo error
in my example. Where I wrote
$im=$imn->reduce('op',2);
it must say
$im=$imn->reduce('op',3);
But, the question remain in how to do an 'op' that
result in a sorted overlapping between all the sub images
In other words. Suppose you have n=0 sub image with
a red circle and in n=1 a sub image with a blue rectangle.
Some pixeles of both images are in common.
Then, what I want is to get a composed image that shows
the red circle overlapping the blue rectangle. The same
idea for many subimages with sorted overlapping.
Regards,
El jue, 24 oct 2024 a las 9:57, Guillermo P. Ortiz
(<gor...@exa.unne.edu.ar>) escribió:
Hello Ed,
thanks for your reply.
That I trying to mean with 'reduce' is some of
projection operation (op) like in PDL::Reduce module
that performs "(op)over" to reduce to N-1
dimension after some operation over the set of
(3,x,y, n) to (3,x,y) rgb images. I mean
a composed rgb image from a set of (layer) n rgb images.
For example:
$imn-> info : pdl D [3,nx,ny,n]
$im=$imn->reduce('op',2);
$im-> info : pdl D [3,nx,ny]
Then, maybe I need to introduce some "sort"
operation in order that when I reduce to one
composed $im image each layer in $imn overlap
the following layer. But, I did not realize how to do that
using some pdl trick.
Thanks a lot for your help
Regards
El jue, 24 oct 2024 a las 9:12, Ed . (<ej...@hotmail.com>) escribió:
Hi Guillermo,
I believe the situation you're describing is you have
effectively a series of (3,x,y) images. You mention
"reducing", but you haven't said what you mean by that - would
it turn that series of images into one image?
wpic is intended to write out a single image, so an ndarray
with multiple images won't work with that. To write out a
series of images as a movie you could use wmpeg, or just to
store the data you could use
https://metacpan.org/pod/PDL::IO::FastRaw and specifically
writefraw. Otherwise to write each image in its own file you
could use something like:
$_->wpic(sprintf "img%03d.png", $count++) for $pdl->dog;
Does that help?
Best regards,
Ed
------------------------------------------------------------------------
*From:* Guillermo P. Ortiz <gor...@exa.unne.edu.ar>
*Sent:* 23 October 2024 4:42 PM
*To:* pdl-devel@lists.sourceforge.net
<pdl-devel@lists.sourceforge.net>;
pdl-gene...@lists.sourceforge.net
<pdl-gene...@lists.sourceforge.net>
*Subject:* [Pdl-devel] project ordered sequence image
Hello everyone,
I have created a pdl with structure (3,size_x,size_y,np)
in order to manage different layer features to compose an rgb
image.
The idea that I can not connect yet is how to "reduce" over dim 3
to project to 3 X s_x X s_y rgb image in ordered fashion
sequence. For example,
suppose that for np=0, 1 and 2, in the resulting image is only
view of 2 that
is allowed by 1 and 0 layers, in that order.
I am trying to use wpic command from PDL::IO::Pic module
to convert via for example pnmtopng using options for it.
There are hashes like {FLAGS => options} used for options
{CONVERTER => 'pnmtopng'} indicating which conversor to use.
But is seems to be intended of rgb 3(4) X s_x X s_y
Thanks for your attention in advance
Regards
--
Dr. Guillermo P. Ortiz
Electromagnetismo Aplicado
Dto. Física, Facultad de Ciencias Exactas
Universidad Nacional del Nordeste
Avda Libertad 5460, Campus UNNE.
W3404AAS Corrientes, Argentina.
(+54) 379-4424678 interno 4613
gortiz*at *unne edu ar
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