Magick::ChannelPerceptualHash Class Reference

Collaboration diagram for Magick::ChannelPerceptualHash:

Public Member Functions
	ChannelPerceptualHash (const ChannelPerceptualHash &channelPerceptualHash_)
	ChannelPerceptualHash (const PixelChannel channel_, const std::string &hash_)
	operator std::string () const
PixelChannel	channel (void) const
bool	isValid () const
double	sumSquaredDifferences (const ChannelPerceptualHash &channelPerceptualHash_)
double	srgbHuPhash (const size_t index_) const
double	hclpHuPhash (const size_t index_) const
	ChannelPerceptualHash (const PixelChannel channel_, const MagickCore::ChannelPerceptualHash *channelPerceptualHash_)

Private Attributes
PixelChannel	_channel
std::vector< double >	_srgbHuPhash
std::vector< double >	_hclpHuPhash

Detailed Description

Definition at line 81 of file Statistic.h.

Constructor & Destructor Documentation

ChannelPerceptualHash() [1/4]

Magick::ChannelPerceptualHash::ChannelPerceptualHash

(

void

)

Definition at line 121 of file Statistic.cpp.

  : _channel(SyncPixelChannel),
    _srgbHuPhash(7),
    _hclpHuPhash(7)
{
}

ChannelPerceptualHash() [2/4]

Magick::ChannelPerceptualHash::ChannelPerceptualHash

(

const ChannelPerceptualHash &

channelPerceptualHash_

)

Definition at line 128 of file Statistic.cpp.

  : _channel(channelPerceptualHash_._channel),
    _srgbHuPhash(channelPerceptualHash_._srgbHuPhash),
    _hclpHuPhash(channelPerceptualHash_._hclpHuPhash)
{
}

ChannelPerceptualHash() [3/4]

Magick::ChannelPerceptualHash::ChannelPerceptualHash	(	const PixelChannel	channel_,
		const std::string &	hash_ )

Definition at line 136 of file Statistic.cpp.

  : _channel(channel_),
    _srgbHuPhash(7),
    _hclpHuPhash(7)
{
  size_t
    i;
 
  if (hash_.length() != 70)
    throw ErrorOption("Invalid hash length");
 
  for (i=0; i<14; i++)
  {
    unsigned int
      hex;
 
    double
      value;
 
    if (sscanf(hash_.substr(i*5,5).c_str(),"%05x",&hex) != 1)
      throw ErrorOption("Invalid hash value");
 
    value=((unsigned short)hex) / pow(10.0, (double)(hex >> 17));
    if (hex & (1 << 16))
      value=-value;
    if (i < 7)
      _srgbHuPhash[i]=value;
    else
      _hclpHuPhash[i-7]=value;
  }
}

~ChannelPerceptualHash()

Magick::ChannelPerceptualHash::~ChannelPerceptualHash

(

void

)

Definition at line 169 of file Statistic.cpp.

{
}

ChannelPerceptualHash() [4/4]

Magick::ChannelPerceptualHash::ChannelPerceptualHash	(	const PixelChannel	channel_,
		const MagickCore::ChannelPerceptualHash *	channelPerceptualHash_ )

Definition at line 263 of file Statistic.cpp.

  : _channel(channel_),
    _srgbHuPhash(7),
    _hclpHuPhash(7)
{
  size_t
    i;
 
  for (i=0; i<7; i++)
  {
    _srgbHuPhash[i]=channelPerceptualHash_->phash[0][i];
    _hclpHuPhash[i]=channelPerceptualHash_->phash[1][i];
  }
}

Member Function Documentation

channel()

Magick::PixelChannel Magick::ChannelPerceptualHash::channel

(

void

)

const

Definition at line 217 of file Statistic.cpp.

{
  return(_channel);
}

hclpHuPhash()

double Magick::ChannelPerceptualHash::hclpHuPhash

(

const size_t

index_

)

const

Definition at line 255 of file Statistic.cpp.

{
  if (index_ > 6)
    throw ErrorOption("Valid range for index is 0-6");
 
  return(_hclpHuPhash.at(index_));
}

isValid()

bool Magick::ChannelPerceptualHash::isValid

(

)

const

Definition at line 222 of file Statistic.cpp.

{
  return(_channel != SyncPixelChannel);
}

operator std::string()

Magick::ChannelPerceptualHash::operator std::string

(

)

const

Definition at line 173 of file Statistic.cpp.

{
  std::string
    hash;
 
  size_t
    i;
 
  if (!isValid())
    return(std::string());
 
  for (i=0; i<14; i++)
  {
    char
      buffer[6];
 
    double
      value;
 
    unsigned int
      hex;
 
    if (i < 7)
      value=_srgbHuPhash[i];
    else
      value=_hclpHuPhash[i-7];
 
    hex=0;
    while(hex < 7 && fabs(value*10) < 65536)
    {
      value=value*10;
      hex++;
    }
 
    hex=(hex<<1);
    if (value < 0.0)
      hex|=1;
    hex=(hex<<16)+(unsigned int)(value < 0.0 ? -(value - 0.5) : value + 0.5);
    (void) FormatLocaleString(buffer,6,"%05x",hex);
    hash+=std::string(buffer);
  }
  return(hash);
}

srgbHuPhash()

double Magick::ChannelPerceptualHash::srgbHuPhash

(

const size_t

index_

)

const

Definition at line 247 of file Statistic.cpp.

{
  if (index_ > 6)
    throw ErrorOption("Valid range for index is 0-6");
 
  return(_srgbHuPhash.at(index_));
}

sumSquaredDifferences()

double Magick::ChannelPerceptualHash::sumSquaredDifferences

(

const ChannelPerceptualHash &

channelPerceptualHash_

)

Definition at line 227 of file Statistic.cpp.

{
  double
    ssd;
 
  size_t
    i;
 
  ssd=0.0;
  for (i=0; i<7; i++)
  {
    ssd+=((_srgbHuPhash[i]-channelPerceptualHash_._srgbHuPhash[i])*
      (_srgbHuPhash[i]-channelPerceptualHash_._srgbHuPhash[i]));
    ssd+=((_hclpHuPhash[i]-channelPerceptualHash_._hclpHuPhash[i])*
      (_hclpHuPhash[i]-channelPerceptualHash_._hclpHuPhash[i]));
  }
  return(ssd);
}

Member Data Documentation

_channel

PixelChannel Magick::ChannelPerceptualHash::_channel

private

Definition at line 125 of file Statistic.h.

_hclpHuPhash

std::vector<double> Magick::ChannelPerceptualHash::_hclpHuPhash

private

Definition at line 127 of file Statistic.h.

_srgbHuPhash

std::vector<double> Magick::ChannelPerceptualHash::_srgbHuPhash

private

Definition at line 126 of file Statistic.h.

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The documentation for this class was generated from the following files:

• ImageMagick-7/Magick++/lib/Magick++/Statistic.h
• ImageMagick-7/Magick++/lib/Statistic.cpp