Do I need to prepare the Viola-Jones Algorithm with my database to get accurate results?

Question

I am trying to extract the facial features of the faces database, but I realized that the Viola-Jones algorithm does not work well * in two cases:

• When I try to find my eyes one by one
• When I try to find my mouth.

* Does not work well: Detects different parts of the image like eyes or mouth. Or sometimes it discovers several of them, which is impossible. The images I use have a clean green background and contain the face of the face.

Detection.cpp:

#include "Detection.h"

Detection::Detection(const char* imagePath, const char* detectorType)
{
    pImage_ = cvLoadImage(imagePath, CV_LOAD_IMAGE_COLOR);
    pStorage_ = cvCreateMemStorage(0);
    pCascade_ = (CvHaarClassifierCascade* ) cvLoad(detectorType,0,0,0);

    if(!pImage_ || !pStorage_ || !pCascade_)
    {
        std::cout << "Problem with Loading Image" << std::endl;
        exit(-1);
    }

    // Detect Faces in Image
    pFaceRectSeq_ = cvHaarDetectObjects(pImage_, pCascade_, pStorage_, 1.1, 3, CV_HAAR_DO_CANNY_PRUNING, cvSize(0,0));
    // Create a Window To Display Detected Faces
    cvNamedWindow("Detected", CV_WINDOW_AUTOSIZE);

    // Draw a Rectengular Outline Around Each Detection
    for(int i = 0; i < (pFaceRectSeq_ ? pFaceRectSeq_->total : 0); i++)
    {
        CvRect* r = (CvRect*) cvGetSeqElem(pFaceRectSeq_,0);
        CvPoint pt1 = { r->x, r->y };
        CvPoint pt2 = { r->x + r->width, r->y + r->height };
        cvRectangle(pImage_, pt1, pt2, CV_RGB(0,255,0), 3, 4, 0);
    }

    // r can be saved to a file/database as feature set

    cvShowImage("Detected", pImage_);
    cvWaitKey(0);
}

Detection::~Detection()
{
    cvDestroyWindow("Detected");
    cvReleaseImage(&pImage_);
    if(pCascade_) 
        cvReleaseHaarClassifierCascade(&pCascade_);
    if(pStorage_)
        cvReleaseMemStorage(&pStorage_);
}

void Detection::SaveFaceFeatures(char* fileName)
{

}

main.cpp:

#include <iostream>
#include "Detection.h"

const char* imagePath           = "C:/1.jpg";
const char* faceDetector        = "C:/opencv/data/haarcascades/haarcascade_frontalface_default.xml";
const char* eyesDetector        = "C:/opencv/data/haarcascades/haarcascade_mcs_eyepair_big.xml";
const char* righteyeDetector    = "C:/opencv/data/haarcascades/haarcascade_mcs_righteye.xml";
const char* leftEyeDetector     = "C:/opencv/data/haarcascades/haarcascade_mcs_lefteye.xml";
const char* noseDetector        = "C:/opencv/data/haarcascades/haarcascade_mcs_nose.xml";
const char* mouthDetector       = "C:/opencv/data/haarcascades/haarcascade_mcs_mouth.xml";

int main(int argc, char* argv[])
{
    Detection *face     = new Detection(imagePath, faceDetector);
    //face->SaveFaceFeatures("01-1mFeatures.txt");
    Detection *eyes     = new Detection(imagePath, eyesDetector);
    //Detection *rightEye = new Detection(imagePath, righteyeDetector);
    //Detection *leftEye    = new Detection(imagePath, leftEyeDetector);
    Detection *nose     = new Detection(imagePath, noseDetector);
    //Detection *mouth  = new Detection(imagePath, mouthDetector);
    return 0;
}

I use

• haarcascade_mcs_righteye.xml for detecting the right eye,
• haarcascade_mcs_lefteye.xml for detecting the left eye
• haarcascade_mcs_mouth.xml for mouth detection.

? ? , AdaBoost?

Answer 1

( ) , . opencv:

OpenCV\\CPP\tutorial_code\objectDetection\

API. API, , .

Answer 2

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