Java 降低图像质量以实现更快的surf算法opencv Android_Java_Android_C++_Image

Java 降低图像质量以实现更快的surf算法opencv Android

java android c++ image

Java 降低图像质量以实现更快的surf算法opencv Android,java,android,c++,image,Java,Android,C++,Image,我正在尝试将图像与android上的surf算法进行匹配。我有一个JavaCameraView对象，它在我的java类中从照相机捕获图像。我像这样将此图像传递给我的本地类： @Override public void onCameraViewStarted(int width, int height) { _mRgba = new Mat(height, width, CvType.CV_8UC4); } @Override pub

我正在尝试将图像与android上的surf算法进行匹配。我有一个JavaCameraView对象，它在我的java类中从照相机捕获图像。我像这样将此图像传递给我的本地类：

      @Override
    public void onCameraViewStarted(int width, int height) {
        _mRgba = new Mat(height, width, CvType.CV_8UC4);

    }

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

    }

    @Override
    public Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame) 
  {
        _mRgba = inputFrame.rgba();
        nativeClass.detectAndMatch(_mRgba.getNativeObjAddr());

        return _mRgba;
    }

Size szSource = new Size(160,120);
_mRgba = new Mat(szSource, CvType.CV_8UC3);

<>但是在C++代码中，SURF算法是非常慢的。这是我的代码：

 Mat& frame = *(Mat*)addrRgba;
    Mat grayFrame, desGrayFrame;
    Mat object, desObject;
    vector<KeyPoint> kpObject;
    vector<KeyPoint> kpGrayFrame;
    vector<vector<DMatch > > matches;
    vector<DMatch > good_matches;
    float thresholdMatchingNN=0.7;
    unsigned int tresholdGoodMatches = 4;
    int minHess = 3000;
    FlannBasedMatcher matcher;
    object = imread ("/sdcard/NoTouch/elli.png", CV_LOAD_IMAGE_GRAYSCALE);
    if(! object.data )
    {
        __android_log_print(ANDROID_LOG_ERROR, "TRACKERS", "%s", "Can not 
        load image from phone");

   }
    SurfFeatureDetector detector(minHess);
    detector.detect(object, kpObject);
    SurfDescriptorExtractor extractor;
    extractor.compute(object, kpObject, desObject);
    cvtColor(frame, grayFrame, CV_RGB2GRAY);
    detector.detect(grayFrame, kpGrayFrame);
    extractor.compute(grayFrame, kpGrayFrame, desGrayFrame);
    matcher.knnMatch(desObject, desGrayFrame, matches, 2);

它稍微快一点，但仍然很慢。我对java中的代码感到困惑：

Size szSource = new Size(160,120);