Hi, Hernan,
You can specify scale independently by feeding a vector into the
"scale=>"
field of the t_linear parameters. More easily, you can use
PDL::Transform's
autoscaling features:
$x = rim("my_image_original.png");
$xdims = [$x->dims];
$xdims->[1] *= 2;
$y = $x->map( t_identity, $xdims );
You can compress the last three lines into one:
$y = $x->match( [(pdl($x->dims)*pdl(1,2))->list] );
Cheers,
Craig
On Aug 31, 2007, at 7:10 AM, Hernán De Angelis wrote:
Dear listers,
I am trying to write a small program in PDL that performs the "baker"
transformation on a sample image. I am a relatiovely new PDL user and
the objective of this is to learn more The basic steps, given an
image, are:
1. 100% stretch in the X direction, e.g. from 100 pixels to 200.
2. 50% contract in the Y direction, e.g. from 100 pixels to 50.
3. divide in two halves along X and create a new image by putting the
right halve above the left one (the new image has the same size as the
input one).
I know how to do step number 3, but my attempts to use PDL::Transform
to do steps 1 and 2 have failed. Basically, I cannot figure out how to
define a transformation (using t_linear) that applies different scales
to X and Y. Any hint will be appreciated.
Thanks in advance
Hernán
--
Hernán De Angelis
Linux user # 397217
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