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TimeSeries Forecasting Weka - Java API

I am trying to implement TimeSeries Forecasting in a JavaService in webMethods. My Code is not working and i am completely lost so i would be glad if you could help me! FYI: I used this Tutorial.
This is the Exception i get: com.wm.lang.flow.FlowException: weka.core.expressionlanguage.parser.Parser.getSymbolFactory()Ljava_cup/runtime/SymbolFactory;
I just post the part which is not webMethods specific (normal Java):
In the first part i am building an ARFF File which works fine. Because i saved the file and opened it with the weka Explorer and everything looks fine.
The ARFF file looks like this:
#relation Rel
#attribute Count numeric
#data
2758
2797
2861
575
505
4029
(just with some more values (59 in total))
I want to forecast the next 3 values.
Forecasting Part:
// At the berginning i create and save the arff file, so i have an Instances
object called 'dataset'
WekaForecaster forecaster = new WekaForecaster();
try {
forecaster.setFieldsToForecast("Count");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
forecaster.setBaseForecaster(new GaussianProcesses());
forecaster.getTSLagMaker().setTimeStampField("Date");
forecaster.getTSLagMaker().setMinLag(1);
forecaster.getTSLagMaker().setMaxLag(12);
forecaster.getTSLagMaker().setAddMonthOfYear(true);
forecaster.getTSLagMaker().setAddQuarterOfYear(true);
PrintStream stream = null;
List<List<NumericPrediction>> forecast = null;
try {
stream = new PrintStream("./path/forecast.txt");
forecaster.buildForecaster(dataset, stream);
forecaster.primeForecaster(dataset);
forecast = forecaster.forecast(3, dataset, stream);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// output the predictions
for (int i = 0; i < 3; i++) {
List<NumericPrediction> predsAtStep = forecast.get(i);
NumericPrediction predForTarget = predsAtStep.get(0);
stream.print("" + predForTarget.predicted() + " ");
stream.println();
}
The Java Code is hard to debug in webMethods, but it seems that forecaster.buildForecaster(dataset, stream); is causing the Exception.
What am i missing?

OCR Scanning with specific font

I am implementing an OCR scanning library for Android App which scans not just numbers but also scan those number with specific fonts which I have defined manually somewhere in library.
I am trying to implement "TESSERACT" library but didn't found font specific scanning implementation. I am using following code to scan OCR not a particular font. My implementation is given below:
private void processImage(Bitmap bMap, String imagePath) {
try {
datapath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/tesseract/";
checkFile(new File(datapath + "tessdata/"));
TessBaseAPI baseApi = new TessBaseAPI();
baseApi.init(datapath, "eng");
baseApi.setImage(bMap);
String recognizedText = baseApi.getUTF8Text();
baseApi.end();
Log.e("log_tag", "onActivityResult recognizedText : " + recognizedText);
Fragment myFragment = getActiveFragment();
if (myFragment != null && myFragment.isVisible() && myFragment instanceof ScanPrescriptionFragment7c) {
((ScanPrescriptionFragment7c) myFragment).displaySelectedImage(recognizedText, imagePath);
}
} catch (Exception e) {
e.printStackTrace();
}
}
Is there any way i can achieve font independent OCR implementation or atleast can provide a custom font to scan for during initialization of OCR?
Thanks!

I do not understand exactly why do you need to specify a font to recognize the characters, do you want to scan different languages or something like that?
I have been developing an Android app with OCR using Tesseract and I wrote down my conclusions and included an example in this post, have a look at it, might be useful to solve your case.

speech recognition with cmu sphinx - doesn't work properly

I'm trying to use CMU Sphinx for speech recognition in java but the result I'm getting is not correct and I don't know why.
I have a .wav file I recorded with my voice saying some sentence in English.
Here is my code in java:
Configuration configuration = new Configuration();
// Set path to acoustic model.
configuration.setAcousticModelPath("resource:/edu/cmu/sphinx/models/en-us/en-us");
// Set path to dictionary.
configuration.setDictionaryPath("resource:/edu/cmu/sphinx/models/en-us/cmudict-en-us.dict");
// Set language model.
configuration.setLanguageModelPath("resource:/edu/cmu/sphinx/models/en-us/en-us.lm.dmp");
StreamSpeechRecognizer recognizer = new StreamSpeechRecognizer(configuration);
recognizer.startRecognition(new FileInputStream("assets/voice/some_wav_file.wav"));
SpeechResult result = null;
while ((result = recognizer.getResult()) != null) {
System.out.println("~~ RESULTS: " + result.getHypothesis());
}
recognizer.stopRecognition();
}
catch(Exception e){
System.out.println("ERROR: " + e.getMessage());
}
I also have another code in Android that doesn't work as well:
Assets assets = new Assets(context);
File assetDir = assets.syncAssets();
String prefix = assetDir.getPath();
Config c = Decoder.defaultConfig();
c.setString("-hmm", prefix + "/en-us-ptm");
c.setString("-lm", prefix + "/en-us.lm");
c.setString("-dict", prefix + "/cmudict-en-us.dict");
Decoder d = new Decoder(c);
InputStream stream = context.getResources().openRawResource(R.raw.some_wav_file);
d.startUtt();
byte[] b = new byte[4096];
try {
int nbytes;
while ((nbytes = stream.read(b)) >= 0) {
ByteBuffer bb = ByteBuffer.wrap(b, 0, nbytes);
short[] s = new short[nbytes/2];
bb.asShortBuffer().get(s);
d.processRaw(s, nbytes/2, false, false);
}
} catch (IOException e) {
Log.d("ERROR: ", "Error when reading file" + e.getMessage());
}
d.endUtt();
Log.d("TOTAL RESULT: ", d.hyp().getHypstr());
for (Segment seg : d.seg()) {
Log.d("RESULT: ", seg.getWord());
}
I used this website to convert the wav file to 16bit, 16khz, mono and little-endian (tried all the options of it).
Any ideas why is doesn't work. I use the built in dictionaries and accustic models and my accent in English is not perfect (don't know if it matters).
EDIT:
This is my file. I recorded myself saying: "My baby is cute" and that's what I expect to be the output.
In the pure java code I get: "i've amy's youth" and in the android code I getl: " it"
Here is file containing the logs.

Your audio is somewhat corrupted by conversion. You should record into wav originally or into some other lossless format. Your pronunciation is also far from US English. For conversion between formats you can use sox instead of external website. Your android sample seems correct but it feels like you decode different file with android. You might check that you have actual proper file in resources.

Encoding and decoding random byte array with zxing

I'm trying to transfer a byte array with QR code, so for testing, I decided to generate a random byte array, encode it as QR code, then decode it. I used ISO-8859-1 to convert byte array to string s.t it does not lose data while transmission:
For encoder side:
byte []buffer = new byte[11];
com.google.zxing.Writer writer = new QRCodeWriter();
Random randomGenerator = new Random();
for(int i=0;i<=10;i++){
buffer[i]=(byte) randomGenerator.nextInt(254);
}
// Log.i("time1","original: "+Arrays.toString(buffer));
String decoded = null;
try {
decoded = new String(buffer, "ISO-8859-1");
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
result=writer.encode(decoded, BarcodeFormat.QR_CODE, 500, 500);
} catch (WriterException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
In this way I have converted byte array to QR code, it has no problem.
But for the receiver side:
LuminanceSource source = new PlanarYUVLuminanceSource(data,640,480,0,0,640,480,false);
bmtobedecoded = new BinaryBitmap(new HybridBinarizer(source));
Map<DecodeHintType,Object> mp=new HashMap<DecodeHintType, Object>();
mp.put(DecodeHintType.TRY_HARDER, true);
try {
result= qrr.decode(bmtobedecoded,mp);
} catch (NotFoundException e) {
Log.i("123","not found");
e.printStackTrace();
} catch (ChecksumException e) {
Log.i("123","checksum");
e.printStackTrace();
} catch (FormatException e) {
Log.i("123","format");
e.printStackTrace();
}
I tried to decode the generated QR code, but it throws out NotFoundException.
Can someone help me with this issue?
Update 1: I confirmed that the decoder works perfectly with the normal QR, I also added DecodeHintType.try_harder but still no good.
Update 2: To clarify, below is what I did to convert between byte array and string:
Random randomGenerator = new Random();
for(int i=0;i<=10;i++){
buffer[i]=(byte) randomGenerator.nextInt(254);
}
Log.i("time1","original: "+Arrays.toString(buffer));
String decoded = null;
try {
decoded = new String(buffer, "ISO-8859-1");
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Log.i("time1","encoded string:" + decoded);
BitMatrix result=null;
try {
result=qw.encode(decoded, BarcodeFormat.QR_CODE, 500, 500);
} catch (WriterException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
iv.setImageBitmap(encodematrix(result));
byte[] encoded = null;
try {
encoded = decoded.getBytes("ISO-8859-1");
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Log.i("time1","result byte array:" + java.util.Arrays.toString(encoded));
If you run this, you can easily see that you can get exactly the same array in the end. I have no problem with this.
Update 3: I also tried encoding it using UTF-8, but it loses data, so it cannot be the used in encoder.
Update 4: Just added:
Map<DecodeHintType,Object> mp=new HashMap<DecodeHintType, Object>();
mp.put(DecodeHintType.CHARACTER_SET, "ISO-8859-1");
in the decoder, still throwing out exception.

Try PURE_BARCODE mode as a detection hint. Strangely, false positive detection of finder patterns is a much bigger problem when the image is just a pure synthetic image. The heuristics assume a photo, which doesn't have these problems. In this alternate mode it can take advantage of knowing it's a pure image and not a photo and be much faster and never get the detection wrong.

There are two issues that you have to overcome to store binary data in QR codes.
ISO-8859-1 does not allow bytes in ranges of 00-1F and 7F-9F. Since you are using a random generator, you can just check whether a randomly generated byte fits this value and re-generate it until you get a random byte that fits this range. If you
nevertheless need to encode these bytes anyway, you may encode the array as a Base-64 string or as a hexadecimal string. In case of a hexadecimal string, it will be stored in the QR code in the alphanumeric mode, not in 8-bit mode.
Since you are trying to store binary data in QR codes, you have to
rely only on your own scanner that will handle this binary data, and you need to make sure that your scanner does not use heuristics to automatically determine character encoding, and so on. Most QR decoders use heuristics to detect the character
set used. These heuristics may detect a character set other than
ISO-8859-1 and thus fail to properly display your binary data. Some
scanners use heuristics to detect a character set even if the
character set is explicitly given by the ECI optional extension inside the QR Code.
So, using US-ASCII only (e.g., binary data encoded in Base64 before passing it to a QR Code generator) is the safest choice for QR code against the heuristics. This will also overcome another complication: that ISO-8859-1 was not the default encoding in earlier QR code standard published in 2000 (ISO/IEC 18004:2000). That standard did specify 8-bit Latin/Kana character set in accordance with JIS X 0201 (JIS8 also known as ISO-2022-JP) as default encoding for 8-bit mode, while the updated standard published in 2005 did change the default to ISO-8859-1.
If you store your buffer as a hexadecimal string in your QR code, this will disable all heuristics for sure and should not produce larger QR Code than with Base-64, because each character in the alphanumeric mode takes only 6 bits in the QR code stream.

Zxing qr scanning blackberry crash

I am implementing a QR code scanner for blackberry devices and I am using ZXing libraries to do so. This is for os 6+ by the way. The problem I am having is that sometimes, only sometimes, when the camera opens up to prepare scanning, the device will freeze and do a full reboot...
Otherwise it works most of the time, I am able to scan and decode the qr codes etc. However is just seems like it occasionally feels like crashing for no reason. I do not know if it is something with the camera or something in my code, but I will provide the code.
public void scanBarcode() {
// First we create a hashtable to hold all of the hints that we can
// give the API about how we want to scan a barcode to improve speed
// and accuracy.
Hashtable hints = new Hashtable();
// The first thing going in is a list of formats. We could look for
// more than one at a time, but it's much slower.
Vector formats = new Vector();
formats.addElement(BarcodeFormat.QR_CODE);
hints.put(DecodeHintType.POSSIBLE_FORMATS, formats);
// We will also use the "TRY_HARDER" flag to make sure we get an
// accurate scan
hints.put(DecodeHintType.TRY_HARDER, Boolean.TRUE);
// We create a new decoder using those hints
BarcodeDecoder decoder = new BarcodeDecoder(hints);
// Finally we can create the actual scanner with a decoder and a
// listener that will handle the data stored in the barcode. We put
// that in our view screen to handle the display.
try {
_scanner = new BarcodeScanner(decoder, new MyBarcodeDecoderListener());
_barcodeScreen = new MyBarcodeScannerViewScreen(_scanner);
} catch (Exception e) {
return;
}
// If we get here, all the barcode scanning infrastructure should be set
// up, so all we have to do is start the scan and display the viewfinder
try {
_scanner.stopScan();
_scanner.getPlayer().start();
_scanner.startScan();
UiApplication.getUiApplication().pushScreen(_barcodeScreen);
} catch (Exception e) {
}
}
/***
* MyBarcodeDecoderListener
* <p>
* This BarcodeDecoverListener implementation tries to open any data encoded
* in a barcode in the browser.
*
* #author PBernhardt
*
**/
private class MyBarcodeDecoderListener implements BarcodeDecoderListener {
public void barcodeDecoded(final String rawText) {
//UiApplication.getUiApplication().popScreen(UiApplication.getUiApplication().getActiveScreen());
UtilityDecoder.saveToHistory(rawText);
try {
UtilityDecoder.distributeBarcode(rawText);
} catch (PIMException e) {
}
}
}
I basically call scanBarcode() when I click on a button on a toolbar.
Can anyone tell me if my code is the problem, or the device, or something else? Thanks in advance for any help provided!

Try this link:
Scan Any Type of Barcode Image which Supports Blackberry
See this forun link and see the discussions of that link. Surely, you will get overall concept of barcode scanning and you will also get the Implemention of QRCode in version 5.0
Any type of Barcode scaning in 5.0