I deploy a DNN in my android app, but the FPS is just 4 that makes the frames looks discontinuous, so i intend to create a new thread to handle the object detection task, Here is part of the code:
private Thread mDetectingThread = null;
private boolean startdect = false;
public Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame) {
mRgba = inputFrame.rgba();
if (mDetectingThread == null) {
mDetectingThread = new ObjectDectThread();
}
if (startdect == false) {
mDetectingThread.start();
}
startdect = true;
return mRgba;
}
class ObjectDectThread extends Thread {
final int IN_WIDTH = 300;
final int IN_HEIGHT = 300;
final double IN_SCALE_FACTOR = 0.007843;
final double MEAN_VAL = 127.5;
final double THRESHOLD = 0.3;
@Override
public void run() {
super.run();
Imgproc.cvtColor(mRgba, mRgba, Imgproc.COLOR_RGBA2RGB);
Mat blob = Dnn.blobFromImage(mRgba, IN_SCALE_FACTOR,
new Size(IN_WIDTH, IN_HEIGHT),
new Scalar(MEAN_VAL, MEAN_VAL, MEAN_VAL), /*swapRB*/false, /*crop*/false);
net.setInput(blob);
Mat detections = net.forward();
int cols = mRgba.cols();
int rows = mRgba.rows();
detections = detections.reshape(1, (int) detections.total() / 7);
for (int i = 0; i < detections.rows(); ++i) {
double confidence = detections.get(i, 2)[0];
if (confidence > THRESHOLD) {
int classId = (int) detections.get(i, 1)[0];
int left = (int) (detections.get(i, 3)[0] * cols);
int top = (int) (detections.get(i, 4)[0] * rows);
int right = (int) (detections.get(i, 5)[0] * cols);
int bottom = (int) (detections.get(i, 6)[0] * rows);
Imgproc.rectangle(mRgba, new Point(left, top), new Point(right, bottom),
new Scalar(0, 255, 0), 2);
String label = classNames[classId] + ": " + confidence;
Imgproc.putText(mRgba, label, new Point(left, top - 5),
Core.FONT_HERSHEY_SIMPLEX, 1, new Scalar(255, 0, 0), 2);
}
}
}
}
However when i run app on my phone, it crashes and report "java.lang.IllegalThreadStateException
at java.lang.Thread.start(Thread.java:724)
at com.example.iguardonxiaomi8se.MainActivity.onCameraFrame(MainActivity.java:236)
at org.opencv.android.CameraBridgeViewBase.deliverAndDrawFrame(CameraBridgeViewBase.java:392)
at org.opencv.android.JavaCameraView$CameraWorker.run(JavaCameraView.java:373)
at java.lang.Thread.run(Thread.java:764)"
Who can give me some suggestions ? Thanks in advance !
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