Brian Cassidy

NAME

Algorithm::Scale2x - Generic implementation of the Scale2x algorithm

SYNOPSIS

    use Algorithm::Scale2x;

    # optionally exported
    # use Algorithm::Scale2x qw( scale2x scale3x );

    # To start, you must grab a pixel plus all 8 surrounding pixels
    my @pixels = $image->get_pixels( $x, $y ); 

    # scale2x - returns a 2x2 grid of scaled pixels
    my @result2x = Algorithm::Scale2x::scale2x( @pixels );

    # scale3x - returns a 3x3 grid of scaled pixels
    my @result3x = Algorithm::Scale2x::scale3x( @pixels );

DESCRIPTION

This module provides a generic implementation of the Scale2x and Scale3x algorithms. Scale2x is described as:

    ...[a] real-time graphics effect able to increase the size of small bitmaps
    guessing the missing pixels without interpolating pixels and blurring the images.

METHODS

scale2x( @pixels )

Given a 3x3 grid of pixels (i.e color index numbers), it will expand the centre pixel into 4 new pixels (i.e. 2x scale).

    +---+---+---+
    | 0 | 1 | 2 |    +----+----+
    +---+---+---+    | 4A | 4B |
    | 3 | 4 | 5 | => +----+----+
    +---+---+---+    | 4C | 4D |
    | 6 | 7 | 8 |    +----+----+
    +---+---+---+

scale3x( @pixels )

Given a 3x3 grid of pixels (i.e color index numbers), it will expand the centre pixel into 9 new pixels (i.e. 3x scale).

    +---+---+---+    +----+----+----+
    | 0 | 1 | 2 |    | 4A | 4B | 4C |
    +---+---+---+    +----+----+----+
    | 3 | 4 | 5 | => | 4D | 4E | 4F |
    +---+---+---+    +----+----+----+
    | 6 | 7 | 8 |    | 4G | 4H | 4I |
    +---+---+---+    +----+----+----+

SEE ALSO

  • http://scale2x.sourceforge.net/

  • http://scale2x.sourceforge.net/algorithm.html

AUTHOR

Brian Cassidy <bricas@cpan.org>

COPYRIGHT AND LICENSE

Copyright 2007-2009 by Brian Cassidy

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.