Java 如何计算来自摄影机的两个传入帧之间的差异（打开CV）

我想通过计算来自摄像机的两帧之间的差异来检测运动，并在手机屏幕上显示这种差异。我必须重写

OnCameraFrame（）

方法，所以我做了：

  @Override
    public Mat onCameraFrame(Mat inputFrame) {
        inputFrame.copyTo(current);
        Core.absdiff(current, previous, difference);
        current.copyTo(previous);
        return difference;
    }

但不幸的是，应用程序正在崩溃，我得到：

06-13 18:17:30.000: E/cv::error()(13097): OpenCV Error: Sizes of input arguments do not match (The operation is neither 'array op array' (where arrays have the same size and the same number of channels), nor 'array op scalar', nor 'scalar op array') in void cv::arithm_op(cv::InputArray, cv::InputArray, cv::OutputArray, cv::InputArray, int, void (**)(const uchar*, size_t, const uchar*, size_t, uchar*, size_t, cv::Size, void*), bool, void*), file /home/reports/ci/slave/50-SDK/opencv/modules/core/src/arithm.cpp, line 1277
06-13 18:17:30.005: W/dalvikvm(13097): threadid=11: thread exiting with uncaught exception (group=0x411df2a0)
06-13 18:17:30.005: E/AndroidRuntime(13097): FATAL EXCEPTION: Thread-983
06-13 18:17:30.005: E/AndroidRuntime(13097): CvException [org.opencv.core.CvException: /home/reports/ci/slave/50-SDK/opencv/modules/core/src/arithm.cpp:1277: error: (-209) The operation is neither 'array op array' (where arrays have the same size and the same number of channels), nor 'array op scalar', nor 'scalar op array' in function void cv::arithm_op(cv::InputArray, cv::InputArray, cv::OutputArray, cv::InputArray, int, void (**)(const uchar*, size_t, const uchar*, size_t, uchar*, size_t, cv::Size, void*), bool, void*)

完整类别代码为：

   package com.example.szpieg2;

import org.opencv.android.BaseLoaderCallback;
import org.opencv.android.CameraBridgeViewBase;
import org.opencv.android.CameraBridgeViewBase.CvCameraViewListener;
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.Range;
import org.opencv.core.Size;

import android.app.Activity;
import android.content.pm.ActivityInfo;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.Window;
import android.view.WindowManager;

public class TrackActivity extends Activity implements CvCameraViewListener {
    private Mat current;
    private CameraBridgeViewBase cameraView;
    private Mat previous;
    private Mat difference;//difference between previous and current
    private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {
        @Override
        public void onManagerConnected(int status) {
            switch (status) {
            case LoaderCallbackInterface.SUCCESS: {
                Log.i("Co sie dzieje?", "OpenCV loaded successfully");
                cameraView.enableView();
                // cameraView.setOnTouchListener(ColorBlobDetectionActivity.this);
            }
                break;
            default: {
                super.onManagerConnected(status);
            }
                break;
            }
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
        setContentView(R.layout.activity_track);
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
        cameraView = (CameraBridgeViewBase) findViewById(R.id.surface_view);
        cameraView.setCvCameraViewListener(this);
    }

    // --------Activity Actions---------
    @Override
    public void onPause() {
        if (cameraView != null)
            cameraView.disableView();
        super.onPause();
    }

    @Override
    public void onResume() {
        super.onResume();
        OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_3, this,
                mLoaderCallback);
    }

    public void onDestroy() {
        super.onDestroy();
        if (cameraView != null)
            cameraView.disableView();
    }

    // --------/Activity Actions/---------

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_track, menu);
        return true;
    }

    // --------listener method implementation-------------
    @Override
    public void onCameraViewStarted(int width, int height) {
        previous = new Mat(width, height, CvType.CV_64FC4);
        current = new Mat(width, height, CvType.CV_64FC4);
        difference = new Mat(width, height, CvType.CV_64FC4);
    }

    @Override
    public void onCameraViewStopped() {
        current.release();

    }

    @Override
    public Mat onCameraFrame(Mat inputFrame) {
        inputFrame.copyTo(current);
        Core.absdiff(current, previous, difference);
        current.copyTo(previous);
        return difference;
    }

}

编辑 我已经使用openCV管理器在设备上安装了openCV。所有添加到OpenCV的教程都在该设备上运行。该设备是三星Galaxy Note 2。库项目正在使用is

OpenCV 2.4.3

，而这个项目必须保留

---

[/EDIT]

问题被统一化了

Mat-previous

。因此：

@Override
public Mat onCameraFrame(Mat inputFrame) {
    inputFrame.copyTo(current);
    if(first){//first is true at the first time
        inputFrame.copyTo(previous);
        first = false;
        Log.i("First processing", "Pierwszy przebieg");
    }

    Core.absdiff(current, previous, difference);
//  current.copyTo(previous);
    inputFrame.copyTo(previous);

    return difference;
}