Created
January 21, 2013 03:14
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ラプラシアンフィルタ
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#!/usr/bin/perl | |
use strict; | |
use warnings; | |
use Imager; | |
my $dir='img/'; | |
my @files; | |
opendir(DIR, $dir); | |
@files= grep {/\.bmp$/} readdir(DIR); | |
closedir(DIR); | |
for(@files){ &Laplacian($_) } | |
sub Laplacian{ | |
my $img_name = shift; | |
my $img = Imager->new; | |
$img->read( file => "img/$img_name" ); | |
my $x_m = $img->getwidth(); | |
my $y_m = $img->getheight(); | |
my $img_new = Imager->new( xsize => $x_m, ysize => $y_m ); | |
for my $x(1..($x_m - 2)){ | |
for my $y(1..($y_m -2)){ | |
my ($red,$green,$blue)= &filter($img,$x,$y,); | |
$img_new->setpixel( x=>$x, y=>$y, color=>[$red,$green,$blue]); | |
} | |
} | |
$img_new->write( file=>"img/result/result_$img_name" ); | |
} | |
sub filter{ | |
my $img = shift; | |
my $x = shift; | |
my $y = shift; | |
my $red = 0; | |
my $green = 0; | |
my $blue= 0; | |
my $filter = [[1,1,1,], | |
[1,-8,1,], | |
[1,1,1,]]; | |
$x--; | |
$y--; | |
for my $tmp(@$filter){ | |
for(@$tmp){ | |
my $color = $img->getpixel(x => $x, y => $y); | |
my ($tmp_red,$tmp_green,$tmp_blue) = $color->rgba(); | |
$red += $_ * $tmp_red; | |
$green += $_ * $tmp_green; | |
$blue += $_ * $tmp_blue; | |
$x++; | |
} | |
$x = 0; | |
$y++; | |
} | |
($red,$green,$blue)=&normalization($red,$green,$blue); | |
return ($red, $green,$blue); | |
} | |
sub normalization{ | |
my $red = shift; | |
my $green = shift; | |
my $blue = shift; | |
$red = $red < 0 ? $red = 0 : $red; | |
$green = $green < 0 ? $green = 0 : $green; | |
$blue = $blue < 0 ? $blue = 0 : $blue; | |
$red = $red > 255 ? $red = 255 : $red; | |
$green = $green > 255 ? $green = 255 : $green; | |
$blue = $blue > 255 ? $blue = 255 : $blue; | |
return ($red,$green,$blue); | |
} |
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