"Failed to create image decoder" and other Java exceptions

[TheLastGimbus]

Hi there!

I'm recently testing this lib on large number of images - I was scanning about 1k of them, and this error kept ocuring on one of them:

08-22 11:34:05.015 25468 25885 D skia    : --- Failed to create image decoder with message 'unimplemented'
08-22 11:34:05.015 25468 25885 E ReadFile: Cannot decode bitmap
--------- beginning of crash
08-22 11:34:05.016 25468 25885 E AndroidRuntime: FATAL EXCEPTION: Thread-29
08-22 11:34:05.016 25468 25885 E AndroidRuntime: Process: com.example.myapp, PID: 25468
08-22 11:34:05.016 25468 25885 E AndroidRuntime: java.lang.RuntimeException: Failed to read image file
08-22 11:34:05.016 25468 25885 E AndroidRuntime:    at com.googlecode.tesseract.android.TessBaseAPI.g(Unknown Source:27)
08-22 11:34:05.016 25468 25885 E AndroidRuntime:    at g.b.a.b.run(Unknown Source:4)
08-22 11:34:05.016 25468 25885 E AndroidRuntime:    at java.lang.Thread.run(Thread.java:919)
08-22 11:34:05.090 25468 25885 I Process : Sending signal. PID: 25468 SIG: 9

Sadly, I didn't collect the image itself to see what's wrong, but that's not very important - this completley crashes the app, giving you no way to handle it

Can we just try-catch any Java exceptions (at least in run):

https://github.com/khjde1207/tesseract_ocr/blob/668a1a7dcb42a444c9578309d3768fa7b781693b/android/src/main/java/io/paratoner/flutter_tesseract_ocr/FlutterTesseractOcrPlugin.java#L91-L101

...and pass them to Dart?

[khjde1207]

Try-catch will be added. If possible, please upload an error image as well.

[TheLastGimbus]

Thanks! By the way, again - I would be happy to contribute to this plugin because I will use it a lot - I know Java and Kotlin good enough - if there is something I can help with, let me know!

When do you plan to add "Live OCR" (as you named it) in Android?

(In addition to what I wrote in #4 ) When scanning multiple images, I get this:

W/TessBaseAPI(27912): TessBaseAPI was not terminated using recycle()

But it doesn't crash anything :monocle_face: it would be nice to have more control over tesseract's lifecycle in general :ok_hand:

I will want to scan stuff on 2 threads simontanuesly - for now, it works nice :ok_hand: - please implement "Live OCR" with this in mind if you may :pray:

Thanks again!

[khjde1207]

Converting from Android to CameraImage -> Bytes throws an error. I couldn't find a solution. https://github.com/khjde1207/tesseract_ocr/blob/b32202837723ffe572fa7905a43ddbd5706af5ef/example/lib/camera_view.dart#L737

[khjde1207]

original logic : https://github.com/hazem-saeed/tesseract_ocr/blob/a815ddfadf9dc4b291c76b950aa8887b1550d6a4/android/src/main/java/io/paratoner/tesseract_ocr/TesseractOcrPlugin.java#L76

Logic I modified : https://github.com/khjde1207/tesseract_ocr/blob/b32202837723ffe572fa7905a43ddbd5706af5ef/android/src/main/java/io/paratoner/flutter_tesseract_ocr/FlutterTesseractOcrPlugin.java#L102

https://github.com/adaptech-cz/Tesseract4Android/issues/22

I used the latest version of Tesseract4Android because of this error. The end function is gone in the latest version. calling the stop function. this seems to be the problem

[TheLastGimbus]

I found the image! It was 0 bytes empty file :joy: I added if in my code to skip those...