I am developing an android application where i can select region of interest(ROI) when i touch two points on screen. However, when i try to change the resolution of image, the thing goes weird. What it shows does not same with what i touched. Here are my codes,
MainActivity.java
public class MainActivity extends Activity implements CvCameraViewListener2, OnTouchListener {
private static final String TAG = "OCVSample::Activity";
private Camera_View mOpenCvCameraView;
private List<Size> mResolutionList;
private MenuItem[] mResolutionMenuItems;
private SubMenu mResolutionMenu;
private MenuItem mSaveTemplate;
private MenuItem mTracking;
int startX = 0, endX = 0, startY = 0, endY = 0;
Point start_point, end_point;
Scalar border_colour = new Scalar(255,0,0,0);
boolean sequence = false;
Rect roi_rect = new Rect();
private Mat mZoomWindow;
private Mat rgba;
private Mat mytemplate;
private Mat result;
boolean tracking = false;
int resolution_x, resolution_y;
private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {
@Override
public void onManagerConnected(int status) {
switch (status) {
case LoaderCallbackInterface.SUCCESS:
{
Log.i(TAG, "OpenCV loaded successfully");
mOpenCvCameraView.enableView();
mOpenCvCameraView.setOnTouchListener(MainActivity.this);//TODO
} break;
default:
{
super.onManagerConnected(status);
} break;
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
mOpenCvCameraView = (Camera_View) findViewById(R.id.java_surface_view);
mOpenCvCameraView.setVisibility(SurfaceView.VISIBLE);
mOpenCvCameraView.setCvCameraViewListener(this);
DisplayMetrics displaymetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
int height = displaymetrics.heightPixels;
int width = displaymetrics.widthPixels;
resolution_x = width;
resolution_y = height;
}
@Override
public void onPause()
{
super.onPause();
if (mOpenCvCameraView != null)
mOpenCvCameraView.disableView();
}
@Override
public void onResume()
{
super.onResume();
OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_3, this, mLoaderCallback);
}
public void onDestroy() {
super.onDestroy();
if (mOpenCvCameraView != null)
mOpenCvCameraView.disableView();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
int idx = 0;
mResolutionMenu = menu.addSubMenu("Resolution");
mResolutionList = mOpenCvCameraView.getResolutionList();
mResolutionMenuItems = new MenuItem[mResolutionList.size()];
mSaveTemplate = menu.add("Save Template");
mTracking = menu.add("TplMatch");
ListIterator<Size> resolutionItr = mResolutionList.listIterator();
idx = 0;
while(resolutionItr.hasNext()) {
Size element = resolutionItr.next();
mResolutionMenuItems[idx] = mResolutionMenu.add(1, idx, Menu.NONE,
Integer.valueOf(element.width).toString() + "x" + Integer.valueOf(element.height).toString());
idx++;
}
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getGroupId() == 1) {
int id = item.getItemId();
Size resolution = mResolutionList.get(id);
mOpenCvCameraView.setResolution(resolution);
resolution = mOpenCvCameraView.getResolution();
resolution_x = resolution.width;
resolution_y = resolution.height;
String caption = resolution_x + "x" + resolution_y;
Toast.makeText(this, caption, Toast.LENGTH_SHORT).show();
}else if (item == mSaveTemplate){
if (endX != 0 && endY != 0){
SaveImage(rgba,roi_rect);
}else
Toast.makeText(this, "Please select Region of Interest", Toast.LENGTH_LONG).show();
}else if (item == mTracking){
tracking = !tracking;
getPath();
}
return true;
}
@Override
public void onCameraViewStarted(int width, int height) {
}
@Override
public void onCameraViewStopped() {
}
@Override
public Mat onCameraFrame(CvCameraViewFrame inputFrame) {
rgba = inputFrame.rgba();
if (startX!=0 && endX!=0 && !tracking){
Core.rectangle(rgba,start_point,end_point,border_colour, 0, 0, 0);
roi_rect = new Rect(start_point,end_point);
}
if(tracking){
String infile = getFileAbsPath("image.jpg");
getPath();
mytemplate = Highgui.imread(filename, Highgui.CV_LOAD_IMAGE_UNCHANGED);
Imgproc.cvtColor(mytemplate, mytemplate,CvType.CV_32FC1 , 3);
Log.i (TAG, "Sizec = "+ mytemplate.cols() + " Sizer = " +mytemplate.rows());
int result_cols = rgba.cols() - mytemplate.cols() + 1;
int result_rows = rgba.rows() - mytemplate.rows() + 1;
Mat result = new Mat(result_rows, result_cols, CvType.CV_32FC1);
/*org.opencv.core.Size size = new org.opencv.core.Size(7,7);
GaussianBlur(rgba, rgba, size, 3.0);
GaussianBlur(mytemplate, mytemplate, size, 3.0);*/
/// Do the Matching and Normalize
Imgproc.matchTemplate( rgba, mytemplate, result, Imgproc.TM_SQDIFF_NORMED );
Core.normalize( result, result, 0, 1, Core.NORM_MINMAX, -1, new Mat());
// / Localizing the best match with minMaxLoc
MinMaxLocResult mmr = Core.minMaxLoc(result);
Point matchLoc;
matchLoc = mmr.minLoc;
// / Show me what you got
Core.rectangle(rgba, matchLoc, new Point(matchLoc.x + mytemplate.cols(),
matchLoc.y + mytemplate.rows()), new Scalar(0, 255, 0));
}
return rgba;
}
@Override
public boolean onTouch(View v, MotionEvent event) {
int action = event.getActionMasked();
switch (action){
case MotionEvent.ACTION_DOWN:
if(sequence){
startX = (int)event.getX();
startY = (int)event.getY();
sequence = !sequence;
}else{
endX = (int)event.getX();
endY = (int)event.getY();
sequence = !sequence;
}
}
DisplayMetrics displaymetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
int height = displaymetrics.heightPixels;
int width = displaymetrics.widthPixels;
//int offsetX = (int) ((width - resolution_x)/2.0);
Log.i (TAG, "height: "+height+" width: "+width);
startX = (int) ((float)startX/width*resolution_x);
startY = (int) ((float)startY/height*resolution_y);
endX = (int) ((float)endX/width*resolution_x);
endY = (int) ((float)endY/height*resolution_y);
start_point = new Point(startX,startY);
end_point = new Point(endX,endY);
Log.i (TAG, start_point +" " +end_point+" "+resolution_x+" "+resolution_y);
/*float eventX = event.getX();
float eventY = event.getY();
float[] eventXY = new float[] {eventX, eventY};
int x = Integer.valueOf((int)eventXY[0]);
int y = Integer.valueOf((int)eventXY[1]);
if (event.getAction()==event.ACTION_DOWN){
startX = x;
startY = y;
}
if (event.getAction()==event.ACTION_UP){
endX = x;
endY = y;
}
start_point = new Point(startX,startY);
end_point = new Point(endX,endY);*/
return false;
}
}
Camera_View.java
public class Camera_View extends JavaCameraView{
private static final String TAG = "Camera View";
private String mPictureFileName;
public Camera_View(Context context, AttributeSet attrs) {
super(context, attrs);
}
public List<String> getEffectList() {
return mCamera.getParameters().getSupportedColorEffects();
}
public boolean isEffectSupported() {
return (mCamera.getParameters().getColorEffect() != null);
}
public String getEffect() {
return mCamera.getParameters().getColorEffect();
}
public void setEffect(String effect) {
Camera.Parameters params = mCamera.getParameters();
params.setColorEffect(effect);
mCamera.setParameters(params);
}
public List<Size> getResolutionList() {
return mCamera.getParameters().getSupportedPreviewSizes();
}
public void setResolution(Size resolution) {
disconnectCamera();
mMaxHeight = resolution.height;
mMaxWidth = resolution.width;
connectCamera(getWidth(), getHeight());
}
public Size getResolution() {
return mCamera.getParameters().getPreviewSize();
}
}
I've tried this codes
DisplayMetrics displaymetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
int height = displaymetrics.heightPixels;
int width = displaymetrics.widthPixels;
startX = (int) ((float)startX/width*resolution_x);
startY = (int) ((float)startY/height*resolution_y);
endX = (int) ((float)endX/width*resolution_x);
endY = (int) ((float)endY/height*resolution_y);
to solve my problem but something went wrong. Can Anyone help me?
来源：https://stackoverflow.com/questions/34988449/how-to-get-the-actual-point-when-i-touch-on-screen