NAME
   Math::PSNR - Calculate PSNR (Peak Signal-to-Noise Ratio) and MSE (Mean
   Square Error).

VERSION
   This document describes Math::PSNR version 0.02

SYNOPSIS
       use Math::PSNR;

       my $psnr = Math::PSNR->new(
           {
               bpp => 8,
               x   => [ 1.1, 2.2, 3.3, 4.4, 5.5 ],
               y   => [ 9.9, 8.8, 7.7, 6.6, 5.5 ],
           }
       );

       # Calculate MSE
       $psnr->mse;

       # Calculate PSNR
       $psnr->psnr;

       # Access to member variable of x
       $psnr->x(
           {
               r => [ 1.1, 2.2, 3.3, 4.4, 5.5 ],
               g => [ 1.1, 2.2, 3.3, 4.4, 5.5 ],
               b => [ 1.1, 2.2, 3.3, 4.4, 5.5 ],
           }
       );

       # Access to member variable of y
       $psnr->y(
           {
               r => [ 9.9, 8.8, 7.7, 6.6, 5.5 ],
               g => [ 9.9, 8.8, 7.7, 6.6, 5.5 ],
               b => [ 9.9, 8.8, 7.7, 6.6, 5.5 ],
           }
       );

       # Calculate MSE of three components signal (e.g. RGB image)
       $psnr->msr_rgb;

       # Calculate PSNR of three components signal (e.g. RGB image)
       $psnr->psnr_rgb;

DESCRIPTION
   This module calculates PSNR (Peak Signal-to-Noise Ration) and MSE (Mean
   Square Error).

   PSNR and MSE are the index of measuring quality between different
   signals. They are commonly used to evaluate quality of images.

   This module can deal with single component signals (e.g. monochrome
   image) and three components signals (e.g. color (RGB) image).

   More examples are in my GitHub repository.
   <https://github.com/moznion/p5-Math--PSNR>

INTERFACES
 "Math::PSNR->new( bpp => $bpp, x => $x, y => $y )"
   Creates an instance. Attributes are as follows:

  "bpp"
   Specify the bpp (bit per pixel). It sets 2^(bpp) - 1 to maximum power
   ("maximum power" means maximum allowable value of signal).

   "is : rw"
       This attribute is rewritable. Default accessor to this attribute is
       provided.

   "isa : Int"
       Please specify value of this attribute as integer.

   "default : 8"
       This attribute has default value. If *bpp* is not specified, it will
       be set 8 (bit).

   "required : 0"
       You do not have to set value of this attribute at constructor.

  "x"
   One side of signal for calculate PSNR and MSE.

   "is : rw"
       This attribute is rewritable. Default accessor to this attribute is
       provided.

   "isa : ArrayRef|HashRef"
       Please specify value of this attribute as numerical array reference
       or hash reference.

   "required : 1"
       You must set value of this attribute at constructor.

  "y"
   Another signal for calculate PSNR or MSE.

   "is : rw"
       This attribute is rewritable. Default accessor to this attribute is
       provided.

   "isa : ArrayRef|HashRef"
       Please specify value of this attribute as numerical array reference
       or hash reference.

   "required : 1"
       You must set value of this attribute at constructor.

METHODS
   "mse"
       This function calculates and returns MSE of single component signal.
       This function requires values of attribute *x* and *y* that is
       numerical array reference. Signal (array) length of *x* and *y* must
       be the same.

       This function can use cache. If instance is immutable, this function
       returns previous calculated result.

   "psnr"
       This function calculates and returns PSNR of single component
       signal. This function requires values of attribute *x* and *y* that
       is numerical array reference. Signal (array) length of *x* and *y*
       must be the same.

       This function can use cache. If instance is immutable, this function
       returns previous calculated result. And this function uses cache of
       MSE if it is available.

   "mse_rgb"
       This function calculates and returns MSE of three components (RGB)
       signal. This function requires values of attribute *x* and *y* that
       is hash reference. Those hash references must have three components
       (keys of hash are 'r', 'g', and 'b'). Signal length of each
       components (keys) of *x* and *y* must be the same.

       This function can use cache like above-functions.

   "psnr_rgb"
       This function calculates and returns PSNR of three components
       signal. This function requires values of attribute *x* and *y* that
       is hash reference. Those hash references must have three components
       (keys of hash are 'r', 'g', and 'b'). Signal length of each
       components (keys) of *x* and *y* must be the same.

       This function can use cache like above-functions.

CONFIGURATION AND ENVIRONMENT
   Math::PSNR requires no configuration files or environment variables.

DEPENDENCIES
   Mouse (version 1.02 or later)
   Test::Exception (version 0.31 or later)
   Test::Warn (version 0.24 or later)

INCOMPATIBILITIES
   None reported.

BUGS AND LIMITATIONS
   No bugs have been reported.

   Please report any bugs or feature requests to
   "[email protected]", or through the web interface at
   <http://rt.cpan.org>.

AUTHOR
   moznion "<[email protected]>"

LICENCE AND COPYRIGHT
   Copyright (c) 2012, moznion "<[email protected]>". All rights reserved.

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

DISCLAIMER OF WARRANTY
   BECAUSE THIS SOFTWARE IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
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   EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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