Hello.
I'm trying to develop a mobile app where I would perform some operations on detected face images. So first I want to display detected images on the screen. I used example opencvsamplefacedetection as a starting point. Then I created a imageview object (detectedFace). Following is what I attempted:
public Mat onCameraFrame(CvCameraViewFrame inputFrame) {
mRgba = inputFrame.rgba();
mGray = inputFrame.gray();
if (mAbsoluteFaceSize == 0) {
int height = mGray.rows();
if (Math.round(height * mRelativeFaceSize) > 0) {
mAbsoluteFaceSize = Math.round(height * mRelativeFaceSize);
}
mNativeDetector.setMinFaceSize(mAbsoluteFaceSize);
}
MatOfRect faces = new MatOfRect();
if (mDetectorType == JAVA_DETECTOR) {
if (mJavaDetector != null)
mJavaDetector.detectMultiScale(mGray, faces, 1.1, 2, 2, // TODO: objdetect.CV_HAAR_SCALE_IMAGE
new Size(mAbsoluteFaceSize, mAbsoluteFaceSize), new Size());
}
else if (mDetectorType == NATIVE_DETECTOR) {
if (mNativeDetector != null)
mNativeDetector.detect(mGray, faces);
}
else {
Log.e(TAG, "Detection method is not selected!");
}
Rect[] facesArray = faces.toArray();
for (int i = 0; i < facesArray.length; i++){
Core.rectangle(mRgba, facesArray[i].tl(), facesArray[i].br(), FACE_RECT_COLOR, 3);
}
**if (facesArray.length>=1){
Rect Reg = facesArray[0];
Mat m = mGray.submat(Reg);
Bitmap bm = Bitmap.createBitmap(m.cols(), m.rows(),Bitmap.Config.ARGB_8888);
Utils.matToBitmap(m, bm);
// find the imageview and draw it!
ImageView iv = (ImageView) findViewById(R.id.detectedFace);
iv.setImageBitmap(bm);
}**
return mRgba;
}
When I run this I found that at iv.setImageBitmap(bm) my program crashes. Why is this? Is there a reason why I can't change attributes within this class? Please help me to figure out how this can be done. Thanks!