有些专家可以解释一下我是否可以使用cvHaarDetectObjects()方法来检测方块并获得宽度和高度？我找到了一个使用这种方法进行面部检测的代码,但我需要知道是否可以将它用于矩形检测.
String src="src/squiredetection/MY.JPG";
IplImage grabbedImage = cvLoadImage(src);
IplImage grayImage = IplImage.create(grabbedImage.width(),grabbedImage.height(),IPL_DEPTH_8U,1);
cvCvtColor(grabbedImage,grayImage,CV_BGR2GRAY);
CvSeq faces = cvHaarDetectObjects(grayImage,cascade,storage,1.1,3,0);//*
for (int i = 0; i < faces.total(); i++) {
CvRect r = new CvRect(cvGetSeqElem(faces,i));
cvRectangle(grabbedImage,cvPoint(r.x(),r.y()),cvPoint(r.x()+r.width(),r.y()+r.height()),CvScalar.RED,1,CV_AA,0);
/* hatPoints[0].x = r.x-r.width/10; hatPoints[0].y = r.y-r.height/10;
hatPoints[1].x = r.x+r.width*11/10; hatPoints[1].y = r.y-r.height/10;
hatPoints[2].x = r.x+r.width/2; hatPoints[2].y = r.y-r.height/2;*/
// cvFillConvexPoly(grabbedImage,hatPoints,hatPoints.length,CvScalar.GREEN,0);
}
当我使用上面的方法时,它抛出以下异常
OpenCV Error: Bad argument (Invalid classifier cascade) in unknown function,file C:\slave\WinInstallerMegaPack\src\opencv\modules\objdetect\src\haar.cpp,line 1036
Exception in thread "main" java.lang.RuntimeException: C:\slave\WinInstallerMegaPack\src\opencv\modules\objdetect\src\haar.cpp:1036: error: (-5) Invalid classifier cascade
at com.googlecode.javacv.cpp.opencv_objdetect.cvHaarDetectObjects(Native Method)
at com.googlecode.javacv.cpp.opencv_objdetect.cvHaarDetectObjects(opencv_objdetect.java:243)
at squiredetection.Test2.main(Test2.java:52 I have put * on this line)
请善意为此提供简单的代码示例.
解决方法
cvHaarDetectObjects()不仅用于检测面部的对象或形状,还取决于HaarCascade分类器.
如果你传递face haarcascade xml然后它将返回一个面数组或者也可以使用眼睛,鼻子等HaarCascade XML文件.您还可以使用opencv_traincascade.exe创建自己的正面和负面样本,以制作自定义haarcascade xml
CvSeq faces = cvHaarDetectObjects(grayImage,classifier,CV_HAAR_DO_CANNY_PRUNING);
for (int i = 0; i < faces.total(); i++) {
// its ok
}
用于矩形检测：
there is an example for rectangle detection in
OpenCV,they use it to detect
the squares in a chessboard. Have a look tosquares.cin
..\OpenCV\samples\c\ directory.
