Control the FPS of a video input OpenCV Android
I am making an application where the camera takes a video and shows the average RGB value per frame. I am able to get the RGB value of each frame with good accuracy. I am also able to see the FPS with enableFpsMeter()
. The problem is that i want to plot a graph of the R value against time for which i need to store the FPS in a variable. I have been trying to figure that out for a few days now. I know that OpenCV for android does not have any inbuilt methods in its library which will allow me to do that.
I have tried the following ways,
1. Tried to create own methods in the JavaCameraView class.
2. Tried making a class which extends JavaCameraView and define a method to find the FPS.
Both of which i failed.
What i want is to control the FPS. i want to set the FPS within a range of 8-16. and also plot a graph of the R value against time or FPS (i guess once i get the fps i cant change it easily to time domain).
My Class
package com.example.virus.bloodpressurereader;
import android.hardware.Camera;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.SurfaceView;
import android.view.View;
import com.jjoe64.graphview.GraphView;
import com.jjoe64.graphview.Viewport;
import com.jjoe64.graphview.series.DataPoint;
import com.jjoe64.graphview.series.LineGraphSeries;
import org.opencv.android.BaseLoaderCallback;
import org.opencv.android.CameraBridgeViewBase;
import org.opencv.android.JavaCameraView;
import org.opencv.android.LoaderCallbackInterface;
import org.opencv.android.OpenCVLoader;
import org.opencv.core.Core;
import org.opencv.core.CvType;
import org.opencv.core.Mat;
import org.opencv.core.Scalar;
import org.opencv.imgproc.Imgproc;
import static org.opencv.core.Core.getTickCount;
import static org.opencv.core.Core.getTickFrequency;
import static org.opencv.core.Core.inRange;
public class VideoRecordingActivity extends AppCompatActivity implements CameraBridgeViewBase.CvCameraViewListener2{
//custom toolbar
private Toolbar toolbar;
//java camera view
JavaCameraView javaCameraView;
Mat mRgba, mHsv;
GraphView graph;
LineGraphSeries<DataPoint> series;
CustomizableCameraView customizableCameraView;
//callback loader
BaseLoaderCallback mCallBackLoader = new BaseLoaderCallback(this) {
@Override
public void onManagerConnected(int status) {
switch (status){
case BaseLoaderCallback.SUCCESS:
javaCameraView.enableView();
break;
default:
super.onManagerConnected(status);
break;
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_video_recording);
//custom toolbar
toolbar = (Toolbar)findViewById(R.id.nav_action);
setSupportActionBar(toolbar);
//connect the camera
javaCameraView = (JavaCameraView)findViewById(R.id.java_camera_view);
//set visibility
javaCameraView.setVisibility(View.VISIBLE);
javaCameraView.setMaxFrameSize(320, 240);
javaCameraView.enableFpsMeter();
javaCameraView.clearFocus();
//set callback function
javaCameraView.setCvCameraViewListener(this);
/*Graph*/
graph = (GraphView)findViewById(R.id.graphView);
Viewport graphView = graph.getViewport();
graphView.setScrollable(true);
}
@Override
protected void onPause() {
super.onPause();
//if java camera view not = null
if(javaCameraView!=null){
javaCameraView.disableView();
}
}
@Override
protected void onDestroy() {
super.onDestroy();
//check if java camera view not = null
if (javaCameraView!=null){
javaCameraView.disableView();
}
}
@Override
protected void onResume() {
super.onResume();
if (OpenCVLoader.initDebug()){
Log.d("openCV", "Connected");
//display when the activity resumed,, callback loader
mCallBackLoader.onManagerConnected(LoaderCallbackInterface.SUCCESS);
}else ...