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//
// Channel Class
//
// $Id: Channel.C,v 4.4.2.2.2.1 1999/07/20 16:15:49 geert Exp $
//
// Copyright (C) 1996-1999 Department of Computer Science, K.U.Leuven, Belgium
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
#include "waili/Channel.h"
#include <stdio.h>
#include <iostream>
#include <math.h>
/* needed on Debian > 2.2 */
#include <float.h>
const char *Channel::rcsid = "$Id: Channel.C,v 4.4.2.2.2.1 1999/07/20 16:15:49 geert Exp $";
// ----------------------------------------------------------------------------
//
// Channel Abstract Base Class
//
// ----------------------------------------------------------------------------
Channel *Channel::CreateFromDescriptor(u_int cols, u_int rows,
const TransformDescriptor transform[],
u_int depth, int offsetx, int offsety)
{
if (depth == 0)
return new NTChannel(cols, rows, offsetx, offsety);
else {
const Wavelet *wavelet = Wavelet::CreateFromID(transform->filter);
LChannel *ch = NULL;
switch (transform->type) {
case TT_ColsRows:
ch = new LChannelCR(*wavelet, cols, rows, offsetx, offsety);
break;
case TT_Cols:
ch = new LChannelC(*wavelet, cols, rows, offsetx, offsety);
break;
case TT_Rows:
ch = new LChannelR(*wavelet, cols, rows, offsetx, offsety);
break;
}
delete wavelet;
Channel *ch2 = ch->SubBands[0];
cols = ch2->GetCols();
rows = ch2->GetRows();
offsetx = ch2->GetOffsetX();
offsety = ch2->GetOffsetY();
delete ch2;
ch->SubBands[0] = CreateFromDescriptor(cols, rows, transform+1,
depth-1, offsetx, offsety);
return ch;
}
}
double Channel::Psnr(const Channel &channel, PixType maxval) const
{
if (maxval < 0)
maxval = -maxval;
if (Cols != channel.GetCols() || Rows != channel.GetRows())
return(-DBL_MAX);
double mse=MSE(channel);
if (mse == 0)
return(DBL_MAX);
double rmse=sqrt(mse);
double psnr = 20.0*log10(maxval/rmse);
return(psnr);
}
double Channel::MSE(const Channel &channel) const
{
if (Cols != channel.GetCols() || Rows != channel.GetRows())
return(-1);
u64 ss = 0;
for (u_int r = 0; r < Rows; r++)
for (u_int c = 0; c < Cols; c++) {
int d = (*this)(c, r)-channel(c, r);
ss += d*d;
}
return ((double)ss/(double)(Cols*Rows));
}
double Channel::Entropy(void) const
{
PixType min, max;
u64 n;
u64 *histogram = FullHistogram(min, max, n);
double logn = log(double(n));
double entropy = 0;
for (int i = 0; i < max-min+1; i++)
if (histogram[i]) {
double x = double(histogram[i]);
entropy -= x*(log(x)-logn);
}
entropy /= double(n);
entropy *= M_LOG2E;
delete [] histogram;
return(entropy);
}
Channel *Channel::UpScale(u_int s, const Wavelet &wavelet)
{
if (s > 1) {
LChannelCR *channel = new LChannelCR(wavelet);
channel->Cols = Cols<<1;
channel->Rows = Rows<<1;
channel->OffsetX = OffsetX<<1;
channel->OffsetY = OffsetY<<1;
channel->SubBands[SubBand_LH] =
new NTChannel(Cols, Rows, OffsetX, OffsetY);
channel->SubBands[SubBand_HL] =
new NTChannel(Cols, Rows, OffsetX, OffsetY);
channel->SubBands[SubBand_HH] =
new NTChannel(Cols, Rows, OffsetX, OffsetY);
((NTChannel*)channel->SubBands[SubBand_LH])->Clear();
((NTChannel*)channel->SubBands[SubBand_HL])->Clear();
((NTChannel*)channel->SubBands[SubBand_HH])->Clear();
channel->SubBands[SubBand_LL] = this->Clone();
Destroy();
return(channel->UpScale(GetEven(s), wavelet));
} else {
Channel *channel = this->Clone();
Destroy();
return(channel);
}
}
Channel *Channel::Scale(f32 s, const Wavelet &wavelet)
{
u_int cols = (int)floor(Cols*s);
u_int rows = (int)floor(Rows*s);
Channel *channel;
if (s < 1)
channel = DownScale((u_int)floor(1/s), wavelet);
else
channel = UpScale((u_int)ceil(s), wavelet);
if (channel->GetCols() != cols || channel->GetRows() != rows) {
s = (f32)cols / (f32)channel->GetCols();
if (channel->IsLifted()) {
NTChannel *ch = ((LChannel*)channel)->IFwt();
delete channel;
ch->Interpolate(s);
channel = ch;
ch = NULL;
} else
((NTChannel*)channel)->Interpolate(s);
}
return(channel);
}
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