File Coverage

blib/lib/Image/Compare/AVG_THRESHOLD.pm

Criterion	Covered	Total	%
statement	34	36	94.4
branch	7	10	70.0
condition			n/a
subroutine	7	7	100.0
pod	2	2	100.0
total	50	55	90.9

# Comparator for the "average threshold" comparison method.

package Image::Compare::AVG_THRESHOLD;

use warnings;
use strict;

use constant MEAN => 0;
use constant MEDIAN => 1;

use base qw/Image::Compare::Comparator/;

sub accumulate {
	my $self = shift;
	my $diff = $self->color_distance(@_);
	if ($self->{args}{type} == &MEAN) {
		$self->{count}++;
		$self->{sum} += $diff;
	}
	elsif ($self->{args}{type} == &MEDIAN) {
		push(@{$self->{scores}}, $diff);
	}
	else {
		die "Unrecognized average type: '$self->{args}{type}'";
	}
	return undef;
}

sub get_result {
	my $self = shift;
	my $val = 0;
	if ($self->{args}{type} == &MEAN) {
		$val = $self->{sum} / $self->{count};
	}
	elsif ($self->{args}{type} == &MEDIAN) {
		my @vals = sort @{$self->{scores}};
		if (@vals % 2) {
			# Return the middle value
			$val = $vals[(@vals / 2)];
		}
		else {
			# Return the mean of the middle two values
			$val  = $vals[ @vals / 2     ];
			$val += $vals[(@vals / 2) - 1];
			$val /= 2;
		}
	}
	return $val <= $self->{args}{value};
}

1;

__END__