android - 具有 LBP 级联的 javaCV detectMultiScale 在物理设备上不起作用

Question

我的 Android 应用程序使用 javaCV 并使用 LBP 级联调用 detectMultiScale() 函数来检测人脸。它在我的模拟器上工作得很好。然而，当我试图在我的 HTC Incredible S 上测试它时，它返回 0，无法检测到任何人脸!谁能告诉我一些提示为什么它不起作用？非常感谢您的帮助!!!

这是我的人脸检测代码:

    CASCADE_FILE = working_Dir.getAbsolutePath() + "/lbpcascade_frontalface.xml";

    public static CvRect getFaceWithLBP(IplImage grayFaceImg)
    {
         CascadeClassifier cascade = new CascadeClassifier(CASCADE_FILE);
         CvRect facesdetection = new CvRect(null);

         cascade.detectMultiScale(grayFaceImg, facesdetection, 1.1, 2, CV_HAAR_FIND_BIGGEST_OBJECT | CV_HAAR_DO_ROUGH_SEARCH, 
                             new CvSize(), new CvSize(grayFaceImg.width(), grayFaceImg.height()));  

         return facesdetection;
    }

Answer 1

请注意，根据 the OpenCV documentation ，标志(例如 CV_HAAR_FIND_BIGGEST_OBJECT | CV_HAAR_DO_ROUGH_SEARCH)不能用于新级联(如 LBP 级联)。

void CascadeClassifier::detectMultiScale(const Mat& image, vector& objects, double scaleFactor=1.1, int minNeighbors=3, int flags=0, Size minSize=Size(), Size maxSize=Size()) Parameters:

• cascade – Haar classifier cascade (OpenCV 1.x API only). It can be loaded from XML or YAML file using Load(). When the cascade is not needed anymore, release it using cvReleaseHaarClassifierCascade(&cascade).
• image – Matrix of the type CV_8U containing an image where objects are detected.
• objects – Vector of rectangles where each rectangle contains the detected object.
• scaleFactor – Parameter specifying how much the image size is reduced at each image scale.
• minNeighbors – Parameter specifying how many neighbors each candidate rectangle should have to retain it.
• flags – Parameter with the same meaning for an old cascade as in the function cvHaarDetectObjects. It is not used for a new cascade.
• minSize – Minimum possible object size. Objects smaller than that are ignored.
• maxSize – Maximum possible object size. Objects larger than that are ignored.