Visual Servoing Platform
version 3.2.0 under development (2019-01-22)
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#include <visp3/detection/vpDetectorFace.h>
Public Member Functions | |
vpDetectorFace () | |
virtual | ~vpDetectorFace () |
bool | detect (const vpImage< unsigned char > &I) |
bool | detect (const cv::Mat &frame_gray) |
void | setCascadeClassifierFile (const std::string &filename) |
Inherited functionalities from vpDetectorBase | |
vpRect | getBBox (size_t i) const |
vpImagePoint | getCog (size_t i) const |
std::vector< std::string > & | getMessage () |
std::string & | getMessage (size_t i) |
size_t | getNbObjects () const |
std::vector< std::vector< vpImagePoint > > & | getPolygon () |
std::vector< vpImagePoint > & | getPolygon (size_t i) |
Protected Attributes | |
std::vector< cv::Rect > | m_faces |
cv::CascadeClassifier | m_face_cascade |
cv::Mat | m_frame_gray |
std::vector< std::vector< vpImagePoint > > | m_polygon |
std::vector< std::string > | m_message |
size_t | m_nb_objects |
The vpDetectorFace class is a wrapper over OpenCV Haar cascade face detection capabilities. To use this class ViSP should be build against OpenCV 2.2.0 or a more recent version. Installation instructions are provided here https://visp.inria.fr/3rd_opencv.
The following sample code shows how to use this class to detect the largest face in the image. The cascade classifier file "haarcascade_frontalface_alt.xml" can be found in ViSP source code or in OpenCV.
A more complete example that works with images acquired from a camera is provided in tutorial-face-detector-live.cpp.
Definition at line 88 of file vpDetectorFace.h.
vpDetectorFace::vpDetectorFace | ( | ) |
Default constructor.
Definition at line 52 of file vpDetectorFace.cpp.
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inlinevirtual |
Default destructor.
Definition at line 100 of file vpDetectorFace.h.
References vpDetectorBase::detect().
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virtual |
Allows to detect a face in the image. When more than one face is detected, faces are sorted from largest to smallest.
I | : Input image to process. This ViSP image is converted internally in an OpenCV cv::Mat image. If you original image is an gray level OpenCV image, we suggest rather the use of detect(const cv::Mat &). |
The number of detected faces is returned using getNbObjects(). If a face is found the functions getBBox(), getCog() return some information about the location of the face.
The largest face is always available using getBBox(0) or getCog(0).
Implements vpDetectorBase.
Definition at line 84 of file vpDetectorFace.cpp.
References vpImageConvert::convert(), and m_frame_gray.
bool vpDetectorFace::detect | ( | const cv::Mat & | frame_gray | ) |
Allows to detect a face in the image. When more than one face is detected, faces are sorted from largest to smallest.
frame_gray | : Input gray level image to process. |
The number of detected faces is returned using getNbObjects(). If a face is found the functions getBBox(), getCog() return some information about the location of the face.
The largest face is always available using getBBox(0) or getCog(0).
Definition at line 103 of file vpDetectorFace.cpp.
References m_face_cascade, m_faces, vpDetectorBase::m_message, vpDetectorBase::m_nb_objects, and vpDetectorBase::m_polygon.
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inherited |
Return the bounding box of the ith object.
Definition at line 87 of file vpDetectorBase.cpp.
References vpDetectorBase::m_polygon.
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inherited |
Return the center of gravity location of the ith object.
Definition at line 74 of file vpDetectorBase.cpp.
References vpDetectorBase::m_polygon.
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inlineinherited |
Returns the contained message of the ith object if there is one.
Definition at line 107 of file vpDetectorBase.h.
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inherited |
Returns the contained message of the ith object if there is one.
Definition at line 62 of file vpDetectorBase.cpp.
References vpException::badValue, vpDetectorBase::m_message, and vpDetectorBase::m_polygon.
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inlineinherited |
Return the number of objects that are detected.
Definition at line 117 of file vpDetectorBase.h.
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inlineinherited |
Returns object container box as a vector of points.
Definition at line 122 of file vpDetectorBase.h.
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inherited |
Returns ith object container box as a vector of points.
Definition at line 50 of file vpDetectorBase.cpp.
References vpException::badValue, and vpDetectorBase::m_polygon.
void vpDetectorFace::setCascadeClassifierFile | ( | const std::string & | filename | ) |
Set the name of the OpenCV cascade classifier file used for face detection.
filename | : Full path to access to the file. Such a file can be found in OpenCV. Within the last versions it was name "haarcascade_frontalface_alt.xml". |
Definition at line 60 of file vpDetectorFace.cpp.
References vpException::ioError, and m_face_cascade.
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protected |
Haar cascade classifier file name.
Definition at line 92 of file vpDetectorFace.h.
Referenced by detect(), and setCascadeClassifierFile().
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protected |
Bounding box of each detected face.
Definition at line 91 of file vpDetectorFace.h.
Referenced by detect().
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protected |
OpenCV image used as input for the face detection.
Definition at line 93 of file vpDetectorFace.h.
Referenced by detect().
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protectedinherited |
Message attached to each object.
Definition at line 71 of file vpDetectorBase.h.
Referenced by vpDetectorDNN::detect(), detect(), vpDetectorDataMatrixCode::detect(), vpDetectorQRCode::detect(), vpDetectorAprilTag::detect(), and vpDetectorBase::getMessage().
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protectedinherited |
Number of detected objects.
Definition at line 72 of file vpDetectorBase.h.
Referenced by vpDetectorDNN::detect(), detect(), vpDetectorDataMatrixCode::detect(), vpDetectorQRCode::detect(), and vpDetectorAprilTag::detect().
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protectedinherited |
For each object, defines the polygon that contains the object.
Definition at line 67 of file vpDetectorBase.h.
Referenced by vpDetectorDNN::detect(), detect(), vpDetectorDataMatrixCode::detect(), vpDetectorQRCode::detect(), vpDetectorAprilTag::detect(), vpDetectorBase::getBBox(), vpDetectorBase::getCog(), vpDetectorBase::getMessage(), and vpDetectorBase::getPolygon().