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/********************************************************************************
* FaceTrackNoIR This program is a private project of some enthusiastic *
* gamers from Holland, who don't like to pay much for *
* head-tracking. *
* *
* Copyright (C) 2012 Wim Vriend (Developing) *
* Ron Hendriks (Researching and Testing) *
* *
* Homepage *
* *
* 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 3 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, see <http://www.gnu.org/licenses/>. *
* *
********************************************************************************/
#include "ftnoir_filter_ewma2.h"
#include "math.h"
#include <QDebug>
#include <QWidget>
#include "facetracknoir/global-settings.h"
#include <algorithm>
#include <QMutexLocker>
//#define LOG_OUTPUT
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//
// EWMA Filter: Exponentially Weighted Moving Average filter with dynamic smoothing parameter
//
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
FTNoIR_Filter::FTNoIR_Filter() : first_run(true), alpha_smoothing(0.02)
{
}
void FTNoIR_Filter::receiveSettings()
{
s.b->reload();
}
void FTNoIR_Filter::FilterHeadPoseData(const double *target_camera_position,
double *new_camera_position)
{
double delta;
double new_alpha;
double scale[]={0.025f,0.025f,0.025f,6.0f,6.0f,6.0f};
//On the first run, initialize to output=target and return.
if (first_run==true) {
for (int i=0;i<6;i++) {
new_camera_position[i] = target_camera_position[i];
current_camera_position[i] = target_camera_position[i];
alpha[i] = 0.0f;
}
first_run=false;
return;
}
for (int i=0;i<6;i++) {
// Calculate the delta.
delta=target_camera_position[i]-current_camera_position[i];
// Normalise the delta.
delta=std::min<double>(std::max<double>(fabs(delta)/scale[i],0.0),1.0);
// Calculate the new alpha from the normalized delta.
new_alpha=1.0/(s.kMinSmoothing+((1.0-pow(delta,s.kSmoothingScaleCurve))*(s.kMaxSmoothing-s.kMinSmoothing)));
// Update the smoothed alpha.
alpha[i]=(alpha_smoothing*new_alpha)+((1.0-alpha_smoothing)*alpha[i]);
}
// Use the same (largest) smoothed alpha for each channel
//NB: larger alpha = *less* lag (opposite to what you'd expect)
float largest_alpha=0.0f;
for (int i=0;i<6;i++) {
largest_alpha=std::min<double>(largest_alpha, alpha[i]);
}
// Calculate the new camera position.
for (int i=0;i<6;i++) {
new_camera_position[i]=(largest_alpha*target_camera_position[i])+((1.0-largest_alpha)*current_camera_position[i]);
//new_camera_position[i]=(alpha[i]*target_camera_position[i])+((1.0f-alpha[i])*current_camera_position[i]);
}
#ifdef LOG_OUTPUT
// Use this for some debug-output to file...
QFile data(QCoreApplication::applicationDirPath() + "\\EWMA_output.txt");
if (data.open(QFile::WriteOnly | QFile::Append)) {
QTextStream out(&data);
out << "current:\t" << current_camera_position[0]
<< "\t" << current_camera_position[1]
<< "\t" << current_camera_position[2]
<< "\t" << current_camera_position[3]
<< "\t" << current_camera_position[4]
<< "\t" << current_camera_position[5] << '\n';
out << "target:\t" << target_camera_position[0]
<< "\t" << target_camera_position[1]
<< "\t" << target_camera_position[2]
<< "\t" << target_camera_position[3]
<< "\t" << target_camera_position[4]
<< "\t" << target_camera_position[5] << '\n';
out << "output:\t" << new_camera_position[0]
<< "\t" << new_camera_position[1]
<< "\t" << new_camera_position[2]
<< "\t" << new_camera_position[3]
<< "\t" << new_camera_position[4]
<< "\t" << new_camera_position[5] << '\n';
out << "largest_alpha:\t" << largest_alpha << '\n';
}
#endif
// Update the current camera position to the new position.
for (int i = 0; i < 6; i++) {
current_camera_position[i] = new_camera_position[i];
}
}
////////////////////////////////////////////////////////////////////////////////
// Factory function that creates instances if the Filter object.
// Export both decorated and undecorated names.
// GetFilter - Undecorated name, which can be easily used with GetProcAddress
// Win32 API function.
// _GetFilter@0 - Common name decoration for __stdcall functions in C language.
//#pragma comment(linker, "/export:GetFilter=_GetFilter@0")
extern "C" FTNOIR_FILTER_BASE_EXPORT IFilter* CALLING_CONVENTION GetConstructor()
{
return new FTNoIR_Filter;
}
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