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OCR, FaceRecognition, BarcodeScanner using Google Vision
- Thread starter DonManfred
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It is not possible with this lib.
Do you know if it´s possible to add?
Ask google. Google Vision is a Class from google. I just call the google class.
I dont know how to add this as this is part of the library behind (i´m just importing the original from google)
Hi Don,
You could add this function to your library to scan bitmap.
You may need to add the check that detector is operational
B4X:
public void scanBitmap(Bitmap b) {
if(b != null){
Frame frame = (new com.google.android.gms.vision.Frame.Builder()).setBitmap(b).build();
SparseArray<TextBlock> textBlocks = detector.detect(frame);
String blocks = "";
String lines = "";
String words = "";
for (int index = 0; index < textBlocks.size(); index++) {
//extract scanned text blocks here
TextBlock tBlock = textBlocks.valueAt(index);
blocks = blocks + tBlock.getValue() + "\n" + "\n";
for (Text line : tBlock.getComponents()) {
//extract scanned text lines here
lines = lines + line.getValue() + "\n";
for (Text element : line.getComponents()) {
//extract scanned text words here
words = words + element.getValue() + ", ";
}
}
}
if(textBlocks.size() == 0) {
if (ba.subExists(eventName + "_error_result")) {
ba.raiseEventFromDifferentThread(this, null, 0, eventName + "_error_result", true, new Object[] {"Scan Failed: Nothing to scan"});
}
}
else {
if (ba.subExists(eventName + "_blocks_result")) {
ba.raiseEventFromDifferentThread(this, null, 0, eventName + "_blocks_result", true, new Object[] {blocks});
}
if (ba.subExists(eventName + "_lines_result")) {
ba.raiseEventFromDifferentThread(this, null, 0, eventName + "_lines_result", true, new Object[] {lines});
}
if (ba.subExists(eventName + "_words_result")) {
ba.raiseEventFromDifferentThread(this, null, 0, eventName + "_words_result", true, new Object[] {words});
}
}
}
}What I do, is after taking a picture and scanning it, I sometimes need to crop a taken picture to select part of it, and then scan the cropped bitmap.
This line does not return a SparseArray<Textblock>; it returns a SparseArray<Barcode> so the rest of the code will not work.
Of course it works. I have been using in for a couple of weeks now.
And it does return SparseArray<Textblock>, It is for detecting text (OCR) not barcode.
It is modified part from this github project http://www.truiton.com/2016/11/optical-character-recognition-android-ocr/ which is used John Schoeman, and probably your library is based on the same/similar java code since in the first post you link to this github project https://github.com/Truiton/MobileVisionAPI.
All i can say is that i get an error (red line) in eclipse saying that i should change the type to SparseArray<Barcode> instead of TextBlock...
I tried to cast it to a Textblock but it also shows an error at
saying that it cannot cast Barcode to TextBlock.
I tried to cast it to a Textblock but it also shows an error at
B4X:
case Barcode.TEXT:
m.Put("BarcodeType", "TEXT");
TextBlock block = (TextBlock)code;This is probably, because you are using BarcodeDetector not TextRecognizer!
From your post #1, in your library have three components: BarcodeDetector, FaceDetector and TextRecogniser. You should use the code in TextRecogniser part of your library.
The problem was that i did added it to the Barcodedetector, not to the Textdetector-code....
i now added this to the Textdetector-code which raises ONE result-Event...
You can try V1.1
PD: Thank you for your comments! Appreciated
i now added this to the Textdetector-code which raises ONE result-Event...
B4X:
public void scanBitmap(Bitmap b) {
if(b != null){
Frame frame = (new com.google.android.gms.vision.Frame.Builder()).setBitmap(b).build();
SparseArray<TextBlock> textBlocks = detector.detect(frame);
String blocks = "";
String lines = "";
String words = "";
for (int index = 0; index < textBlocks.size(); index++) {
//extract scanned text blocks here
TextBlock tBlock = textBlocks.valueAt(index);
blocks = blocks + tBlock.getValue() + "\n" + "\n";
for (Text line : tBlock.getComponents()) {
//extract scanned text lines here
lines = lines + line.getValue() + "\n";
for (Text element : line.getComponents()) {
//extract scanned text words here
words = words + element.getValue() + ", ";
}
}
}
if(textBlocks.size() == 0) {
ba.raiseEventFromDifferentThread(this, null, 0, eventName + "_result", true, new Object[] {"Scan Failed: Nothing to scan", "","",""});
} else {
ba.raiseEventFromDifferentThread(this, null, 0, eventName + "_result", true, new Object[] {"BLOCK",blocks, lines, words});
}
}
}You can try V1.1
PD: Thank you for your comments! Appreciated
Last edited:
Yes, you are right. My fault ;-)
See my last post
V1.1 does have a Method to scan for text inside a given Bitmap. See post #1
V1.1 can scan a given bitmap
yes. You can call a method and put a Bitmap as parameter. It results in one Event giving the captured textblocks.... No need for Camera
B4X:
Sub btntxtrecognizer_Click
Log("Start Recognize... Recognizer ready = "&txtrecognizer.isOperational)
If txtrecognizer.isOperational Then
'txtrecognizer.takePicture
Dim bmp As Bitmap
bmp.Initialize(File.DirAssets,"cdcover.png")
txtrecognizer.scanBitmap(bmp)
End If
End Sub
Sub TxtRecognizer_Result(info As String, blocks As String, lines As String, words As String)
Log($"TxtRecognizer_Result(${info},${blocks},${lines},${words})"$)
End SubNeeds V1.11 as i found a little mistake in the wrapper...
Needs V1.2 (Updated Lib in Post #1)
- The Scanbitmap result event have one parameter more... A List with a Map for each scanresult.
B4X:
Sub btntxtrecognizer_Click
Log("Start Recognize... Recognizer ready = "&txtrecognizer.isOperational)
If txtrecognizer.isOperational Then
'txtrecognizer.takePicture
Dim bmp As Bitmap
bmp.Initialize(File.DirAssets,"cdcover.png")
txtrecognizer.scanBitmap(bmp)
End If
End Sub
Sub TxtRecognizer_Result(info As String, blocks As String, lines As String, words As String, scanresults As List)
Log($"TxtRecognizer_Result(${info},${blocks},${lines},${words})"$)
If scanresults.IsInitialized And scanresults.Size>0 Then
For i = 0 To scanresults.Size-1
Log(scanresults.Get(i))
Next
End If
End Subthe list is initialized in the wrapper. you are using v1.2 and the scsanbitmap method?
I already showed the code to use it with the Textrecognizer.
The Barcode and Facerecognizers are similar.
No need for another Example. Easy for anyone to build it themself.
The Barcode and Facerecognizers are similar.
No need for another Example. Easy for anyone to build it themself.