I'm using OpenCv with android studio to detect faces in an image along with the eyes and the mouth in each face. But, the problem is whenever I try to detect the mouth it returns multiple circles in a face which is wrong.
Here is the code I added for mouth detection:
private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {
@Override
public void onManagerConnected(int status) {
switch (status) {
...
InputStream iserM = getResources().openRawResource(
R.raw.haarcascade_mcs_mouth);
File cascadeDirERM = getDir("cascadeERM",
Context.MODE_PRIVATE);
File cascadeFileERM = new File(cascadeDirERM,
"haarcascade_mcs_mouth.xml");
FileOutputStream oserM = new FileOutputStream(cascadeFileERM);
byte[] bufferERM = new byte[4096];
int bytesReadERM;
while ((bytesReadERM = iserM.read(bufferERM)) != -1) {
oserM.write(bufferERM, 0, bytesReadERM);
}
iserM.close();
oserM.close();
...
//here begins
mJavaDetectorMouth = new CascadeClassifier(
cascadeFileERM.getAbsolutePath());
if (mJavaDetectorMouth.empty()) {
Log.e(TAG, "Failed to load cascade classifier");
mJavaDetectorMouth = null;
} else
Log.i(TAG, "Loaded cascade classifier from "
+ mCascadeFile.getAbsolutePath());
//here ends
...
}
public Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame) {
...
Rect r = facesArray[i];
MatOfRect mouths = new MatOfRect();
Mat faceROI = mRgba.submat(facesArray[i]);
mJavaDetectorMouth.detectMultiScale(faceROI, mouths,1.1,1,1, new org.opencv.core.Size(30, 30), new org.opencv.core.Size());
Rect[] mouthArray = mouths.toArray();
for (int j = 0; j < mouthArray.length; j++){
Point center1 = new Point(facesArray[i].x + mouthArray[j].x + mouthArray[j].width * 0.5,
facesArray[i].y + mouthArray[j].y + mouthArray[j].height * 0.5);
int radius = (int) Math.round(mouthArray[j].width / 2);
Imgproc.circle(mRgba, center1, radius, new Scalar(255, 0, 0), 4, 8, 0);
}
...
}
I've been looking around since I posted the question and tried a lot of things. But finally I found the solution: I changed:
mJavaDetectorMouth.detectMultiScale(faceROI, mouths,1.1,1,1, new org.opencv.core.Size(30, 30), new org.opencv.core.Size());
To:
mJavaDetectorMouth.detectMultiScale(faceROI, mouths,1.1, 2,
Objdetect.CASCADE_FIND_BIGGEST_OBJECT
| Objdetect.CASCADE_SCALE_IMAGE, new org.opencv.core.Size(30, 30), new org.opencv.core.Size());
and I solved the issue.
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