215 lines
9.3 KiB
C++
215 lines
9.3 KiB
C++
///////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2017, Carnegie Mellon University and University of Cambridge,
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// all rights reserved.
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//
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// ACADEMIC OR NON-PROFIT ORGANIZATION NONCOMMERCIAL RESEARCH USE ONLY
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//
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// BY USING OR DOWNLOADING THE SOFTWARE, YOU ARE AGREEING TO THE TERMS OF THIS LICENSE AGREEMENT.
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// IF YOU DO NOT AGREE WITH THESE TERMS, YOU MAY NOT USE OR DOWNLOAD THE SOFTWARE.
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//
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// License can be found in OpenFace-license.txt
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//
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// * Any publications arising from the use of this software, including but
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// not limited to academic journal and conference publications, technical
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// reports and manuals, must cite at least one of the following works:
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//
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// OpenFace: an open source facial behavior analysis toolkit
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// Tadas Baltrušaitis, Peter Robinson, and Louis-Philippe Morency
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// in IEEE Winter Conference on Applications of Computer Vision, 2016
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//
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// Rendering of Eyes for Eye-Shape Registration and Gaze Estimation
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// Erroll Wood, Tadas Baltrušaitis, Xucong Zhang, Yusuke Sugano, Peter Robinson, and Andreas Bulling
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// in IEEE International. Conference on Computer Vision (ICCV), 2015
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//
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// Cross-dataset learning and person-speci?c normalisation for automatic Action Unit detection
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// Tadas Baltrušaitis, Marwa Mahmoud, and Peter Robinson
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// in Facial Expression Recognition and Analysis Challenge,
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// IEEE International Conference on Automatic Face and Gesture Recognition, 2015
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//
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// Constrained Local Neural Fields for robust facial landmark detection in the wild.
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// Tadas Baltrušaitis, Peter Robinson, and Louis-Philippe Morency.
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// in IEEE Int. Conference on Computer Vision Workshops, 300 Faces in-the-Wild Challenge, 2013.
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//
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///////////////////////////////////////////////////////////////////////////////
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#ifndef __LANDMARK_DETECTOR_MODEL_h_
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#define __LANDMARK_DETECTOR_MODEL_h_
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// OpenCV dependencies
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#include <opencv2/core/core.hpp>
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#include <opencv2/objdetect.hpp>
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// dlib dependencies for face detection
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#include <dlib/image_processing/frontal_face_detector.h>
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#include <dlib/opencv.h>
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#include "PDM.h"
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#include "Patch_experts.h"
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#include "LandmarkDetectionValidator.h"
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#include "LandmarkDetectorParameters.h"
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using namespace std;
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namespace LandmarkDetector
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{
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// A main class containing all the modules required for landmark detection
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// Face shape model
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// Patch experts
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// Optimization techniques
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class CLNF{
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public:
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//===========================================================================
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// Member variables that contain the model description
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// The linear 3D Point Distribution Model
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PDM pdm;
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// The set of patch experts
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Patch_experts patch_experts;
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// The local and global parameters describing the current model instance (current landmark detections)
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// Local parameters describing the non-rigid shape
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cv::Mat_<double> params_local;
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// Global parameters describing the rigid shape [scale, euler_x, euler_y, euler_z, tx, ty]
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cv::Vec6d params_global;
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// A collection of hierarchical CLNF models that can be used for refinement
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vector<CLNF> hierarchical_models;
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vector<string> hierarchical_model_names;
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vector<vector<pair<int,int>>> hierarchical_mapping;
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vector<FaceModelParameters> hierarchical_params;
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//==================== Helpers for face detection and landmark detection validation =========================================
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// Haar cascade classifier for face detection
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cv::CascadeClassifier face_detector_HAAR;
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string face_detector_location;
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// A HOG SVM-struct based face detector
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dlib::frontal_face_detector face_detector_HOG;
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// Validate if the detected landmarks are correct using an SVR regressor
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DetectionValidator landmark_validator;
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// Indicating if landmark detection succeeded (based on SVR validator)
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bool detection_success;
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// Indicating if the tracking has been initialised (for video based tracking)
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bool tracking_initialised;
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// The actual output of the regressor (-1 is perfect detection 1 is worst detection)
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double detection_certainty;
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// Indicator if eye model is there for eye detection
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bool eye_model;
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// the triangulation per each view (for drawing purposes only)
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vector<cv::Mat_<int> > triangulations;
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//===========================================================================
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// Member variables that retain the state of the tracking (reflecting the state of the lastly tracked (detected) image
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// Lastly detect 2D model shape [x1,x2,...xn,y1,...yn]
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cv::Mat_<double> detected_landmarks;
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// The landmark detection likelihoods (combined and per patch expert)
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double model_likelihood;
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cv::Mat_<double> landmark_likelihoods;
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// Keeping track of how many frames the tracker has failed in so far when tracking in videos
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// This is useful for knowing when to initialise and reinitialise tracking
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int failures_in_a_row;
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// A template of a face that last succeeded with tracking (useful for large motions in video)
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cv::Mat_<uchar> face_template;
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// Useful when resetting or initialising the model closer to a specific location (when multiple faces are present)
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cv::Point_<double> preference_det;
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// Useful to control where face detections should not occur (for live demos etc.)
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double detect_Z_max = -1; // Do not detect faces further than this in mm. (-1) refers to detecting all faces
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cv::Rect_<double> detect_ROI = cv::Rect(0, 0, 1, 1); // the face detection bounds (0,0,1,1) means full image (0.25,0.25,0.5,0.5) would imply region of the face only
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// A default constructor
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CLNF();
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// Constructor from a model file
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CLNF(string fname);
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// Copy constructor (makes a deep copy of the detector)
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CLNF(const CLNF& other);
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// Assignment operator for lvalues (makes a deep copy of the detector)
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CLNF & operator= (const CLNF& other);
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// Empty Destructor as the memory of every object will be managed by the corresponding libraries (no pointers)
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~CLNF(){}
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// Move constructor
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CLNF(const CLNF&& other);
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// Assignment operator for rvalues
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CLNF & operator= (const CLNF&& other);
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// Does the actual work - landmark detection
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bool DetectLandmarks(const cv::Mat_<uchar> &image, const cv::Mat_<float> &depth, FaceModelParameters& params);
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// Gets the shape of the current detected landmarks in camera space (given camera calibration)
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// Can only be called after a call to DetectLandmarksInVideo or DetectLandmarksInImage
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cv::Mat_<double> GetShape(double fx, double fy, double cx, double cy) const;
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// A utility bounding box function
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cv::Rect_<double> GetBoundingBox() const;
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// Reset the model (useful if we want to completelly reinitialise, or we want to track another video)
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void Reset();
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// Reset the model, choosing the face nearest (x,y) where x and y are between 0 and 1.
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void Reset(double x, double y);
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// Reading the model in
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void Read(string name);
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// Helper reading function
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void Read_CLNF(string clnf_location);
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private:
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// the speedup of RLMS using precalculated KDE responses (described in Saragih 2011 RLMS paper)
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map<int, cv::Mat_<float> > kde_resp_precalc;
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// The model fitting: patch response computation and optimisation steps
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bool Fit(const cv::Mat_<uchar>& intensity_image, const cv::Mat_<float>& depth_image, const std::vector<int>& window_sizes, const FaceModelParameters& parameters);
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// Mean shift computation that uses precalculated kernel density estimators (the one actually used)
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void NonVectorisedMeanShift_precalc_kde(cv::Mat_<float>& out_mean_shifts, const vector<cv::Mat_<float> >& patch_expert_responses, const cv::Mat_<float> &dxs, const cv::Mat_<float> &dys, int resp_size, float a, int scale, int view_id, map<int, cv::Mat_<float> >& mean_shifts);
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// The actual model optimisation (update step), returns the model likelihood
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double NU_RLMS(cv::Vec6d& final_global, cv::Mat_<double>& final_local, const vector<cv::Mat_<float> >& patch_expert_responses, const cv::Vec6d& initial_global, const cv::Mat_<double>& initial_local,
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const cv::Mat_<double>& base_shape, const cv::Matx22d& sim_img_to_ref, const cv::Matx22f& sim_ref_to_img, int resp_size, int view_idx, bool rigid, int scale, cv::Mat_<double>& landmark_lhoods, const FaceModelParameters& parameters);
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// Removing background image from the depth
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bool RemoveBackground(cv::Mat_<float>& out_depth_image, const cv::Mat_<float>& depth_image);
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// Generating the weight matrix for the Weighted least squares
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void GetWeightMatrix(cv::Mat_<float>& WeightMatrix, int scale, int view_id, const FaceModelParameters& parameters);
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//=======================================================
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// Legacy functions that are not used at the moment
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//=======================================================
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// Mean shift computation
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void NonVectorisedMeanShift(cv::Mat_<double>& out_mean_shifts, const vector<cv::Mat_<float> >& patch_expert_responses, const cv::Mat_<double> &dxs, const cv::Mat_<double> &dys, int resp_size, double a, int scale, int view_id);
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// A vectorised version of mean shift (Not actually used)
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void VectorisedMeanShift(cv::Mat_<double>& meanShifts, const vector<cv::Mat_<float> >& patch_expert_responses, const cv::Mat_<double> &iis, const cv::Mat_<double> &jjs, const cv::Mat_<double> &dxs, const cv::Mat_<double> &dys, const cv::Size patchSize, double sigma, int scale, int view_id);
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};
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//===========================================================================
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}
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#endif
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