Develop Reference

OpenCV face recognition with Android

I am very new to android, as I got a project for maintenance. I completed other part of the project like authentication, token setting etc... In that face recognition is used to identify the person. Previously it was working fine and taken images, trained with it and recognized the person.(Obviously not done by me :)). Now it throws error as
Add Person ActivityCvException [org.opencv.core.CvException:
cv::Exception:
/build/master_pack-android/opencv/modules/core/src/matrix.cpp:1047:
error: (-13) The matrix is not continuous, thus its number of rows can
not be changed in function cv::Mat cv::Mat::reshape(int, int) const
Code sample is as follows
public void training() {
Thread thread;
try{
PreferenceManager.setDefaultValues(getApplicationContext(), R.xml.preferences, false);
}catch (Exception e){
AddPersonActivity.this.runOnUiThread(new Runnable() {
public void run() {
WriteLog("Add Person Activity" +e.fillInStackTrace());
errorAlert("Add Person Activity" +e.fillInStackTrace());
VolleyHelper.progressDialog.dismiss();
}
});
}
WriteLog("training 1 ");
final Handler handler = new Handler(Looper.getMainLooper());
thread = new Thread(new Runnable() {
public void run() {
if (!Thread.currentThread().isInterrupted()) {
try {
WriteLog("training 2 ");
PreProcessorFactory ppF = new PreProcessorFactory(AddPersonActivity.this);
PreferencesHelper preferencesHelper = new PreferencesHelper(AddPersonActivity.this);
String algorithm = preferencesHelper.getClassificationMethod();
FileHelper fileHelper = new FileHelper();
fileHelper.createDataFolderIfNotExsiting();
final File[] persons = fileHelper.getTrainingList();
if (persons.length > 0) {
Recognition rec = RecognitionFactory.getRecognitionAlgorithm(getApplicationContext(), Recognition.TRAINING, algorithm);
for (File person : persons) {
if (person.isDirectory()) {
File[] files = person.listFiles();
int counter = 1;
for (File file : files) {
if (FileHelper.isFileAnImage(file)) {
Mat imgRgb = Imgcodecs.imread(file.getAbsolutePath());
Imgproc.cvtColor(imgRgb, imgRgb, Imgproc.COLOR_BGRA2RGBA);
Mat processedImage = new Mat();
imgRgb.copyTo(processedImage);
List<Mat> images = ppF.getProcessedImage(processedImage, PreProcessorFactory.PreprocessingMode.RECOGNITION);
if (images == null || images.size() > 1) {
continue;
} else {
processedImage = images.get(0);
}
if (processedImage.empty()) {
continue;
}
String[] tokens = file.getParent().split("/");
final String name = tokens[tokens.length - 1];
for (int i = 0; i < files.length; i++) {
File myfile = new File(person +
"\\" + files[i].getName());
String long_file_name = files[i].getName();
System.out.println(long_file_name);
System.out.print(long_file_name);
myfile.renameTo(new File(person +
"\\" + long_file_name + "_101" + ".png"));
}
WriteLog("training 3 ");
MatName m = new MatName("processedImage", processedImage);
fileHelper.saveMatToImage(m, FileHelper.DATA_PATH);
rec.addImage(processedImage, name, false);
counter++;
}
}
}
}
try {
if (rec.train()) {
if (zipFileAtPath("/storage/emulated/0/Pictures/facerecognition/training/" + lcode, "/storage/emulated/0/Pictures/facerecognition/data/SVM/" + lcode + ".zip")) {
WriteLog("training 4 ");
if (zipFileAtPath("/storage/emulated/0/Pictures/facerecognition/data/SVM", "/storage/emulated/0/Pictures/facerecognition/" + "SVM_" + lcode + ".zip")) {
WriteLog("training 5 ");
fileupload(getintent.getStringExtra("lcode"));
} else {
Toast.makeText(getApplicationContext(), "No Face Recognised", Toast.LENGTH_SHORT).show();
}
} else {
Toast.makeText(getApplicationContext(), "No Face Recognised", Toast.LENGTH_SHORT).show();
}
} else {
Toast.makeText(getApplicationContext(), "Try Again", Toast.LENGTH_SHORT).show();
}
} catch (Exception e) {
WriteLog("Add Person Activity" +e.fillInStackTrace());
errorAlert("Add Person Activity" +e.fillInStackTrace());
}
handler.post(new Runnable() {
#Override
public void run() {
}
});
} else {
Thread.currentThread().interrupt();
}
} catch (Exception e) {
AddPersonActivity.this.runOnUiThread(new Runnable() {
public void run() {
VolleyHelper.progressDialog.dismiss();
WriteLog("Add Person Activity" +e.fillInStackTrace());
errorAlert("Add Person Activity" +e.fillInStackTrace());
}
});
}
}
}
});
thread.start();
}

The input image needs to be stored as a continuous block of bytes in memory. I came to a similar situation, particularly because Android (at least the version I tried) does not seem to store images continuously. 1) Check if the image is continuous using: inputImage.isContinuous(). It returns a bool. It should be true. 2) If the image is not continuous, you can create a copy of the image that it is by creating a clone of the image via inputImage.clone() . Behind the scenes, we are creating a deep copy of the input using the create method, that should guarantee that the new matrix is continuous.
//check image before continuing:
if ( !inputImage.isContinuous() ){
//if the image is not continuous, create a deep copy:
inputImage = inputImage.clone();
}

Firebase Uploader AsyncTask doinBackground() error android

I am using chat application. Upto Android 28sdk its worked fine but after i refract to androidx am facing this problem please check my code below and error screenshot.
Error Code Image 1
Error Code Image 2
private void compressAndUpload(final Context context, final String child, final File file) {
compressionTask = new AsyncTask<File, Void, String>() {
#Override
protected String doInBackground(File... files) {
String filePathCompressed = null;
Uri originalFileUri = Uri.fromFile(files[0]);
File tempFile = new File(context.getCacheDir(), originalFileUri.getLastPathSegment());
//tempFile = File.createTempFile(originalFileUri.getLastPathSegment(), null, context.getCacheDir());
if (child.equals("images")) {
filePathCompressed = SiliCompressor.with(context).compress(originalFileUri.toString(), tempFile);
} else {
try {
filePathCompressed = SiliCompressor.with(context).compressVideo(files[0].getPath(), context.getCacheDir().getPath());
} catch (URISyntaxException e) {
e.printStackTrace();
}
}
if (filePathCompressed == null)
filePathCompressed = "";
return filePathCompressed;
}
#Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
File compressed = new File(s);
fileUri = Uri.fromFile(compressed.length() > 0 ? compressed : file);
FirebaseStorage storage = FirebaseStorage.getInstance();
if (uploadRef == null)
uploadRef = storage.getReference().child(child).child(fileUri.getLastPathSegment());
if (replace) {
upload();
} else {
checkIfExists();
}
}
};
compressionTask.execute(file);
}

Photo deleted but reappears when taking a new photo

The app I am making need to take pictures to send them to a server.
I need to take 6 photos at least. I have a recyclerView in which I am displaying a preview of my photo. It's working perfectly (I am using Picasso as photo library).
I need to be able to delete photos before sending them away (and consequently their preview). With a click on the preview, I remove it from my photo tab and update my recyclerview with notifyDataSetChanged().
The photo disappears.
When I take an other picture, I have its preview but the preview from the deleted picture is coming back.
If I delete three pictures and take a new one, I have the preview of the new one and the preview of the 3 deleted pictures.
Here's part of my adapter where I bind my view
#Override
public void onBindViewHolder(#NonNull ViewHolder holder, int position) {
mImageView = holder.mPhotoIV;
File mFile = new File(String.valueOf(Uri.parse(mListOfPhotos.get(position))));
int width = mImageView.getLayoutParams().width;
int height = mImageView.getLayoutParams().height;
Picasso.get()
.load(mFile)
.resize(200, 200)
.error(R.drawable.ic_no_photo_foreground)
.into(mImageView, new com.squareup.picasso.Callback() {
#Override
public void onSuccess() {
}
#Override
public void onError(Exception e) {
}
});
}
Here part of my activity where I'm calling my adapter
mTakePhotoFAB.setOnClickListener(view -> {
mDir = new File(getExternalCacheDir(), "PhotosAuthentifier");
boolean success = true;
if (!mDir.exists()) {
success = mDir.mkdir();
}
if (success) {
File mFile = new File(mDir, new SimpleDateFormat("yyyyMMdd-HHmmss", Locale.getDefault()).format(new Date()) + ".jpg");
mImageCapture.takePicture(mFile,
new ImageCapture.OnImageSavedListener() {
#Override
public void onImageSaved(#NonNull File file) {
mListOfPhotos.add(file.getAbsolutePath());
mNumberOfPhotoTV.setText(getResources().getString(R.string.minPhotos, mListOfPhotos.size()));
if (mListOfPhotos.size() >= 6) {
mSendPhotoFAB.setVisibility(View.VISIBLE);
}
mAdapter = new CameraPhotoAdapter(mListOfPhotos, getBaseContext());
mRecyclerView.setAdapter(mAdapter);
}
#Override
public void onError(#NonNull ImageCapture.ImageCaptureError imageCaptureError, #NonNull String message, #Nullable Throwable cause) {
String mMessage = "Photo capture failed: " + message;
Toast.makeText(CameraActivity.this, mMessage, Toast.LENGTH_SHORT).show();
assert cause != null;
cause.printStackTrace();
}
});
}
});
Function (in my adapter) to remove picture
protected void removePhoto(Context context, ArrayList<String> array, int position) {
File mDir = new File(context.getExternalCacheDir(), "PhotosAuthentifier");
File mFile = new File(array.get(position));
if (mDir.exists()) {
File[] mFilesIntoDir = mDir.listFiles();
if (mFilesIntoDir == null) {
return;
} else {
for (int i = 0; i < mFilesIntoDir.length; i++) {
if (mFilesIntoDir[i].getAbsolutePath().equals(mFile.getAbsolutePath())) {
boolean mSuccess = mFilesIntoDir[i].delete();
if (mSuccess) {
Picasso.get().invalidate(mFile.getAbsolutePath());
mListOfPhotos.remove(mFile.getAbsolutePath());
notifyDataSetChanged();
}
}
}
}
}
}
I tried to invalidate Picasso cache but when I take a new picture, instead of the deleted picture reappearing I have the default behavior when I don't have a good url to upload (a black cross)
Could anyone help please :)?

Downloading multiple pictures with Picasso

I'm trying to download multiple pictures using picasso. here's my code:
for(int i=1; i <=20; i++){
String url = img_url + i + "/profile.jpg";
String img_dir = img_dir + i;
Picasso.with(this).load(url).into(picassoImageTarget(getApplicationContext(),img_dir, img_name));
}
Url of the site looks like this:
site.com/img/equipment/1/profile.jpg,
site.com/img/equipment/2/profile.jpg,
site.com/img/equipment/3/profile.jpg
and so on ...
i tried
Picasso.with(this).load(url).into(picassoImageTarget(getApplicationContext(),img_dir, img_name));
without the for loop and it is working. images are not download when i place it inside the loop.
here's my Target
private Target picassoImageTarget(Context context, final String imageDir, final String imageName) {
Log.d("picassoImageTarget", " picassoImageTarget");
ContextWrapper cw = new ContextWrapper(context);
final File directory = cw.getDir(imageDir, Context.MODE_PRIVATE); // path to /data/data/yourapp/app_imageDir
return new Target() {
#Override
public void onBitmapLoaded(final Bitmap bitmap, Picasso.LoadedFrom from) {
new Thread(new Runnable() {
#Override
public void run() {
final File myImageFile = new File(directory, imageName); // Create image file
FileOutputStream fos = null;
try {
fos = new FileOutputStream(myImageFile);
bitmap.compress(Bitmap.CompressFormat.PNG, 100, fos);
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
Log.i("image", "image saved to >>>" + myImageFile.getAbsolutePath());
}
}).start();
}
#Override
public void onBitmapFailed(Drawable errorDrawable) {
}
#Override
public void onPrepareLoad(Drawable placeHolderDrawable) {
if (placeHolderDrawable != null) {}
}
};
}
please help. thanks.

Targets are held in WeakReferences.
You need to hold a reference to the Targets you want to keep to prevent them from being garbage collected.
Maybe your code would look something like:
final class MyLoader {
final ArrayList<Target> targets = new ArrayList<>(20);
void load(...) {
for(...) {
Target target = picassoImageTarget(...);
targets.add(target);
picasso.load(...).into(target); // TODO: Maybe remove from list when complete.
}
}
}

Download and Save Images Using Picasso

I'm trying to show my news in a custom ListView. Each news is included of some images and I want to
1.download images from server
2.save in local storage
3.save path of images into SQLite
4.show images in ListView using my custom adapter.
I just have problem with steps 1 & 2. I can get news from server and show them in my ListView
and show images from cache by add below code in my adapter:
Picasso.with(context).load(image[position]).into(iv);
By using Picasso.with(context).load(image[position]).into(target) , just I can save one
image in storage.
Please suggest me your idea ...
UPDATE: When I use below code, just one image (last index of my image array) being saved!
How can I save all images in array with this code?!
#Override
protected void onPostExecute(Void result) {
SaveImages();
pDialog.dismiss();
super.onPostExecute(result);
}
String fileName = null;
public void SaveImages() {
for(int i = 0; i < image.length; i++) {
Picasso.with(this).load(image[i]).into(target);
fileName = "image-" + i + ".jpg";
}
}
Target target = new Target() {
#Override
public void onPrepareLoad(Drawable arg0) {
}
#Override
public void onBitmapLoaded(Bitmap bitmap, LoadedFrom arg1) {
File file = new File(Environment.getExternalStorageDirectory().getPath() +"/" + fileName);
try {
file.createNewFile();
FileOutputStream ostream = new FileOutputStream(file);
bitmap.compress(CompressFormat.JPEG, 75, ostream);
ostream.close();
} catch (Exception e) {
e.printStackTrace();
}
}
#Override
public void onBitmapFailed(Drawable arg0) {
}
};

Try to put Target target definition before call to Picasso.with(this).load(image[i]).into(target);
P.S. Using the following code and I saved images very well. Thanks, anyway.
My Code:
final String fileName = mDataset.get(i).getAid() + ".jpg";
Target target = new Target() {
#Override
public void onPrepareLoad(Drawable arg0) {
return;
}
#Override
public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom arg1) {
try {
File file = null;
// judge "imgs/.nomedia"'s existance to judge whether path available
if(LightCache.testFileExist(GlobalConfig.getFirstStoragePath()
+ "imgs" + File.separator +".nomedia") == true)
file = new File(GlobalConfig.getFirstStoragePath()
+ "imgs" + File.separator + fileName);
else file = new File(GlobalConfig.getSecondStoragePath()
+ "imgs" + File.separator + fileName);
file.createNewFile();
FileOutputStream ostream = new FileOutputStream(file);
bitmap.compress(Bitmap.CompressFormat.JPEG, 80, ostream);
ostream.close();
} catch (Exception e) {
e.printStackTrace();
}
}
#Override
public void onBitmapFailed(Drawable arg0) {
return;
}
};
Picasso.with(GlobalConfig.getContext())
.load(Wenku8API.getCoverURL(mDataset.get(i).getAid()))
.into(target);

Custom target for storing photo in phone gallery.
public class TargetPhoneGallery implements Target
{
private final WeakReference<ContentResolver> resolver;
private final String name;
private final String desc;
public TargetPhoneGallery(ContentResolver r, String name, String desc)
{
this.resolver = new WeakReference<ContentResolver>(r);
this.name = name;
this.desc = desc;
}
#Override
public void onPrepareLoad (Drawable arg0)
{
}
#Override
public void onBitmapLoaded (Bitmap bitmap, LoadedFrom arg1)
{
ContentResolver r = resolver.get();
if (r != null)
{
MediaStore.Images.Media.insertImage(r, bitmap, name, desc);
}
}
#Override
public void onBitmapFailed (Drawable arg0)
{
}
}
Picasso.with(context).load(image[position]).into(new TargetPhoneGallery(view.getContentResolver(), "image name", "image desc"));

although this post is old, it seems the question hasn't been answered yet.
Reading your code, it appears the call you make to picasso could be asynchronous.
You should definitely check that, as if it is the case, you are starting image.length tasks, changing the filename at each new task, leading all tasks to complete and save to the last filename that was set.
To solve this, you should override Target constructor and add a filename parameter so it's ready when the task ends, in your onBitmapLoaded listener.