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Sharpen_c.cpp
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Sharpen_c.cpp
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//
// FFT3DFilter plugin for Avisynth 2.6 - 3D Frequency Domain filter
// pure C++ filtering functions
//
// Copyright(C)2004-2006 A.G.Balakhnin aka Fizick, [email protected], http://avisynth.org.ru
// Copyright(C) 2018 Daniel Klíma aka Klimax
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 2 as published by
// the Free Software Foundation.
//
// 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., 675 Mass Ave, Cambridge, MA 02139, USA.
//
//-----------------------------------------------------------------------------------------
#include "windows.h"
#include "fftwlite.h"
#include <math.h>
#include "Sharpen.h"
// since v1.7 we use outpitch instead of outwidth
//-------------------------------------------------------------------------------------------
//
void SharpenFilter::Sharpen_C() noexcept
{
float psd(0.0f), sfact(0.0f);
if (sharpen != 0 && dehalo == 0)
{
for (int block = start_block; block < blocks; block++)
{
for (int h = 0; h < bh; h++) // middle
{
for (int w = 0; w < outwidth; w++)
{
psd = (outcur[w][0] * outcur[w][0] + outcur[w][1] * outcur[w][1]);
//improved sharpen mode to prevent grid artifactes and to limit sharpening both fo low and high amplitudes
sfact = (1 + sharpen * wsharpen[w] * sqrtf(psd*sigmaSquaredSharpenMax / ((psd + sigmaSquaredSharpenMin)*(psd + sigmaSquaredSharpenMax))));
// sharpen factor - changed in v1.1c
outcur[w][0] *= sfact;
outcur[w][1] *= sfact;
}
outcur += outpitch;
wsharpen += outpitch;
}
wsharpen -= outpitch * bh;
}
}
else if (sharpen == 0 && dehalo != 0)
{
for (int block = start_block; block < blocks; block++)
{
for (int h = 0; h < bh; h++) // middle
{
for (int w = 0; w < outwidth; w++)
{
psd = (outcur[w][0] * outcur[w][0] + outcur[w][1] * outcur[w][1]);
//improved sharpen mode to prevent grid artifactes and to limit sharpening both fo low and high amplitudes
sfact = (psd + ht2n) / ((psd + ht2n) + dehalo * wdehalo[w] * psd);
outcur[w][0] *= sfact;
outcur[w][1] *= sfact;
}
outcur += outpitch;
wdehalo += outpitch;
}
wdehalo -= outpitch * bh;
}
}
else if (sharpen != 0 && dehalo != 0)
{
for (int block = start_block; block < blocks; block++)
{
for (int h = 0; h < bh; h++) // middle
{
for (int w = 0; w < outwidth; w++)
{
psd = (outcur[w][0] * outcur[w][0] + outcur[w][1] * outcur[w][1]);
//improved sharpen mode to prevent grid artifactes and to limit sharpening both fo low and high amplitudes
sfact = (1 + sharpen * wsharpen[w] * sqrtf(psd*sigmaSquaredSharpenMax / ((psd + sigmaSquaredSharpenMin)*(psd + sigmaSquaredSharpenMax)))) *
(psd + ht2n) / ((psd + ht2n) + dehalo * wdehalo[w] * psd);
outcur[w][0] *= sfact;
outcur[w][1] *= sfact;
}
outcur += outpitch;
wsharpen += outpitch;
wdehalo += outpitch;
}
wsharpen -= outpitch * bh;
wdehalo -= outpitch * bh;
}
}
}
//-----------------------------------------------------------------------------------------
//-----------------------------------------------------------------------------------------
// DEGRID
//-----------------------------------------------------------------------------------------
//-------------------------------------------------------------------------------------------
//
void SharpenFilter::Sharpen_degrid_C() noexcept
{
float psd(0.0f), sfact(0.0f);
if (sharpen != 0 && dehalo == 0)
{
for (int block = start_block; block < blocks; block++)
{
const float gridfraction = degrid * outcur[0][0] / gridsample[0][0];
for (int h = 0; h < bh; h++) // middle
{
for (int w = 0; w < outwidth; w++)
{
float gridcorrection0 = gridfraction * gridsample[w][0];
float re = outcur[w][0] - gridcorrection0;
float gridcorrection1 = gridfraction * gridsample[w][1];
float im = outcur[w][1] - gridcorrection1;
psd = (re*re + im * im) + 1e-15f;// power spectrum density
// psd = (outcur[w][0]*outcur[w][0] + outcur[w][1]*outcur[w][1]);
//improved sharpen mode to prevent grid artifactes and to limit sharpening both fo low and high amplitudes
sfact = (1 + sharpen * wsharpen[w] * sqrtf(psd*sigmaSquaredSharpenMax / ((psd + sigmaSquaredSharpenMin)*(psd + sigmaSquaredSharpenMax))));
// sharpen factor - changed in v1.1c
re *= sfact; // apply filter on real part
im *= sfact; // apply filter on imaginary part
outcur[w][0] = re + gridcorrection0;
outcur[w][1] = im + gridcorrection1;
}
outcur += outpitch;
wsharpen += outpitch;
gridsample += outpitch;
}
wsharpen -= outpitch * bh;
gridsample -= outpitch * bh; // restore pointer to only valid first block - bug fixed in v1.8.1
}
}
if (sharpen == 0 && dehalo != 0)
{
for (int block = start_block; block < blocks; block++)
{
const float gridfraction = degrid * outcur[0][0] / gridsample[0][0];
for (int h = 0; h < bh; h++) // middle
{
for (int w = 0; w < outwidth; w++)
{
float gridcorrection0 = gridfraction * gridsample[w][0];
float re = outcur[w][0] - gridcorrection0;
float gridcorrection1 = gridfraction * gridsample[w][1];
float im = outcur[w][1] - gridcorrection1;
psd = (re*re + im * im) + 1e-15f;// power spectrum density
// psd = (outcur[w][0]*outcur[w][0] + outcur[w][1]*outcur[w][1]);
//improved sharpen mode to prevent grid artifactes and to limit sharpening both fo low and high amplitudes
sfact = (psd + ht2n) / ((psd + ht2n) + dehalo * wdehalo[w] * psd);
re *= sfact; // apply filter on real part
im *= sfact; // apply filter on imaginary part
outcur[w][0] = re + gridcorrection0;
outcur[w][1] = im + gridcorrection1;
}
outcur += outpitch;
wdehalo += outpitch;
gridsample += outpitch;
}
wdehalo -= outpitch * bh;
gridsample -= outpitch * bh; // restore pointer to only valid first block - bug fixed in v1.8.1
}
}
if (sharpen != 0 && dehalo != 0)
{
for (int block = start_block; block < blocks; block++)
{
const float gridfraction = degrid * outcur[0][0] / gridsample[0][0];
for (int h = 0; h < bh; h++) // middle
{
for (int w = 0; w < outwidth; w++)
{
float gridcorrection0 = gridfraction * gridsample[w][0];
float re = outcur[w][0] - gridcorrection0;
float gridcorrection1 = gridfraction * gridsample[w][1];
float im = outcur[w][1] - gridcorrection1;
psd = (re*re + im * im) + 1e-15f;// power spectrum density
// psd = (outcur[w][0]*outcur[w][0] + outcur[w][1]*outcur[w][1]);
//improved sharpen mode to prevent grid artifactes and to limit sharpening both fo low and high amplitudes
sfact = (1 + sharpen * wsharpen[w] * sqrtf(psd*sigmaSquaredSharpenMax / ((psd + sigmaSquaredSharpenMin)*(psd + sigmaSquaredSharpenMax)))) *
(psd + ht2n) / ((psd + ht2n) + dehalo * wdehalo[w] * psd);
re *= sfact; // apply filter on real part
im *= sfact; // apply filter on imaginary part
outcur[w][0] = re + gridcorrection0;
outcur[w][1] = im + gridcorrection1;
}
outcur += outpitch;
wsharpen += outpitch;
wdehalo += outpitch;
gridsample += outpitch;
}
wsharpen -= outpitch * bh;
wdehalo -= outpitch * bh;
gridsample -= outpitch * bh; // restore pointer to only valid first block - bug fixed in v1.8.1
}
}
}