我正在尝试使用OpenCv4android为Android开发增强现实应用程序。我需要处理相机帧缓冲区。为了查看帧缓冲区矩阵的内容,我将Mat对象转换为Bitmap并编写了一个png图像。我得到的只是一大块绿色像素。相机缓冲区应该没问题,因为opencv正常。我的代码如下。
public class OpenGLSurfaceWithCameraTest extends Activity implements CvCameraViewListener2{
private static final String TAG = "OpenGLSurfaceWithCamera";
Mat mRgba;
boolean flag = true;
private CameraBridgeViewBase cameraPreview;
private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {
@Override
public void onManagerConnected(int status) {
switch (status) {
case LoaderCallbackInterface.SUCCESS:
{
Log.i(TAG, "OpenCV loaded successfully");
cameraPreview.enableView();
} break;
default:
{
super.onManagerConnected(status);
} break;
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.camera_with_opengl);
cameraPreview = (CameraBridgeViewBase)findViewById(R.id.camera_view_opengl);
cameraPreview.setCvCameraViewListener(this);
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
if(cameraPreview != null){
cameraPreview.disableView();
}
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_3, this, mLoaderCallback);
}
@Override
public void onCameraViewStarted(int width, int height) {
// TODO Auto-generated method stub
mRgba = new Mat(height, width, CvType.CV_8UC4);
}
@Override
public void onCameraViewStopped() {
// TODO Auto-generated method stub
mRgba.release();
}
@Override
public Mat onCameraFrame(CvCameraViewFrame inputFrame) {
// TODO Auto-generated method stub
mRgba = inputFrame.rgba();
Mat tmp = new Mat(mRgba.rows(), mRgba.cols(), CvType.CV_8UC1, new Scalar(4));
Imgproc.pyrDown(mRgba, tmp);
Imgproc.pyrDown(tmp, tmp);
Bitmap bitmap = Bitmap.createBitmap(tmp.cols(), tmp.rows(), Config.ARGB_8888);
Utils.matToBitmap(tmp, bitmap);
if(flag){
try {
File root = null;
String state = Environment.getExternalStorageState();
if(state.equals(Environment.MEDIA_MOUNTED)){
root = new File(Environment.getExternalStorageDirectory(), "aqib");
if(root == null){
Log.e(TAG, "root is null");
}
if(!root.exists()){
root.mkdirs();
}
}
if(root.exists()){
Log.e(TAG, "root exists");
}
File file = new File(root, "test.png");
OutputStream stream = new FileOutputStream(file);
bitmap.compress(Bitmap.CompressFormat.PNG, 90, stream);
stream.close();
flag = false;
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
Log.e(TAG, e.getMessage());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
bitmap.recycle();
return mRgba;
}
}
有人可以建议我如何获得相机帧缓冲区的正确输出,以便我可以在opengl中使用它进行处理吗?
答案 0 :(得分:0)
显然,在我的情况下,第一帧始终是绿色框架。尝试从晚些时候开始编写框架,如10日或类似的东西,并且它有效。