Anonymous user
Hough transform: Difference between revisions
→{{header|Perl}}: Fix use strict. Fix code.
m (Phix/pGUI) |
(→{{header|Perl}}: Fix use strict. Fix code.) |
||
Line 643:
=={{header|Perl}}==
{{trans|Sidef}}
<lang perl>use
use warnings;
use Imager;
use constant pi => 3.14159265;
Line 656 ⟶ 659:
my($xsize, $ysize) = ($im->getwidth, $im->getheight);
my $ht = Imager->new(xsize => $width, ysize => $height);
my @canvas;
for my $i (0..$height-1) { for my $j (0..$width-1) { $canvas[$i][$j] = 255 } }
$ht->box(filled => 1, color => 'white');
my $rmax = sqrt($xsize**2 + $ysize**2);
my $dr = 2 * $rmax / $height;
my $dth = pi / $width;
for my $x (0..$xsize-1) {
for my $y (0..$ysize-1) {
my $col = $im->getpixel(x => $x, y => $y);
my($r,$g,$b) = $col->rgba;
next if $r==255; # && $g==255 && $b==255;
for my $k (0..$width) {
my $th = $dth*$k;
my $
my $iry = ($height/2 + int($
$ht->setpixel(x => $k, y => $iry, color => [ ($canvas[$iry][$k]--) x 3] );
}
Line 681 ⟶ 685:
my $img = Imager->new;
$img->read(file => 'ref/pentagon.png') or die "Cannot read: ", $img->errstr;
my $ht = hough($img);
$ht->write(file => 'hough_transform.png');
</lang>
| |||