sustaining_gazes/lib/local/FaceAnalyser/include/Face_utils.h

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///////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2017, Carnegie Mellon University and University of Cambridge,
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// all rights reserved.
//
// ACADEMIC OR NON-PROFIT ORGANIZATION NONCOMMERCIAL RESEARCH USE ONLY
//
// BY USING OR DOWNLOADING THE SOFTWARE, YOU ARE AGREEING TO THE TERMS OF THIS LICENSE AGREEMENT.
// IF YOU DO NOT AGREE WITH THESE TERMS, YOU MAY NOT USE OR DOWNLOAD THE SOFTWARE.
//
// License can be found in OpenFace-license.txt
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//
// * Any publications arising from the use of this software, including but
// not limited to academic journal and conference publications, technical
// reports and manuals, must cite at least one of the following works:
//
// OpenFace: an open source facial behavior analysis toolkit
// Tadas Baltru<72>aitis, Peter Robinson, and Louis-Philippe Morency
// in IEEE Winter Conference on Applications of Computer Vision, 2016
//
// Rendering of Eyes for Eye-Shape Registration and Gaze Estimation
// Erroll Wood, Tadas Baltru<72>aitis, Xucong Zhang, Yusuke Sugano, Peter Robinson, and Andreas Bulling
// in IEEE International. Conference on Computer Vision (ICCV), 2015
//
// Cross-dataset learning and person-speci?c normalisation for automatic Action Unit detection
// Tadas Baltru<72>aitis, Marwa Mahmoud, and Peter Robinson
// in Facial Expression Recognition and Analysis Challenge,
// IEEE International Conference on Automatic Face and Gesture Recognition, 2015
//
// Constrained Local Neural Fields for robust facial landmark detection in the wild.
// Tadas Baltru<72>aitis, Peter Robinson, and Louis-Philippe Morency.
// in IEEE Int. Conference on Computer Vision Workshops, 300 Faces in-the-Wild Challenge, 2013.
//
///////////////////////////////////////////////////////////////////////////////
#ifndef __FACE_UTILS_h_
#define __FACE_UTILS_h_
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include "PDM.h"
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namespace FaceAnalysis
{
//===========================================================================
// Defining a set of useful utility functions to be used within FaceAnalyser
// Aligning a face to a common reference frame
void AlignFace(cv::Mat& aligned_face, const cv::Mat& frame, const cv::Mat_<double>& detected_landmarks, cv::Vec6d params_global, const PDM& pdm, bool rigid = true, double scale = 0.6, int width = 96, int height = 96);
void AlignFaceMask(cv::Mat& aligned_face, const cv::Mat& frame, const cv::Mat_<double>& detected_landmarks, cv::Vec6d params_global, const PDM& pdm, const cv::Mat_<int>& triangulation, bool rigid = true, double scale = 0.6, int width = 96, int height = 96);
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void Extract_FHOG_descriptor(cv::Mat_<double>& descriptor, const cv::Mat& image, int& num_rows, int& num_cols, int cell_size = 8);
void Visualise_FHOG(const cv::Mat_<double>& descriptor, int num_rows, int num_cols, cv::Mat& visualisation);
// The following two methods go hand in hand
void ExtractSummaryStatistics(const cv::Mat_<double>& descriptors, cv::Mat_<double>& sum_stats, bool mean, bool stdev, bool max_min);
void AddDescriptor(cv::Mat_<double>& descriptors, cv::Mat_<double> new_descriptor, int curr_frame, int num_frames_to_keep = 120);
//===========================================================================
// Point set and landmark manipulation functions
//===========================================================================
// Using Kabsch's algorithm for aligning shapes
//This assumes that align_from and align_to are already mean normalised
cv::Matx22d AlignShapesKabsch2D(const cv::Mat_<double>& align_from, const cv::Mat_<double>& align_to);
//=============================================================================
// Basically Kabsch's algorithm but also allows the collection of points to be different in scale from each other
cv::Matx22d AlignShapesWithScale(cv::Mat_<double>& src, cv::Mat_<double> dst);
//===========================================================================
// Visualisation functions
//===========================================================================
void Project(cv::Mat_<double>& dest, const cv::Mat_<double>& mesh, double fx, double fy, double cx, double cy);
//===========================================================================
// Angle representation conversion helpers
//===========================================================================
cv::Matx33d Euler2RotationMatrix(const cv::Vec3d& eulerAngles);
// Using the XYZ convention R = Rx * Ry * Rz, left-handed positive sign
cv::Vec3d RotationMatrix2Euler(const cv::Matx33d& rotation_matrix);
cv::Vec3d Euler2AxisAngle(const cv::Vec3d& euler);
cv::Vec3d AxisAngle2Euler(const cv::Vec3d& axis_angle);
cv::Matx33d AxisAngle2RotationMatrix(const cv::Vec3d& axis_angle);
cv::Vec3d RotationMatrix2AxisAngle(const cv::Matx33d& rotation_matrix);
//============================================================================
// Matrix reading functionality
//============================================================================
// Reading a matrix written in a binary format
void ReadMatBin(std::ifstream& stream, cv::Mat &output_mat);
// Reading in a matrix from a stream
void ReadMat(std::ifstream& stream, cv::Mat& output_matrix);
// Skipping comments (lines starting with # symbol)
void SkipComments(std::ifstream& stream);
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}
#endif