Android Tutorial [Example] Add OCR features to your Android application

susu · Mar 7, 2013

Hi Erel, is it a free service? Because I see this page OCRWebService.com - OCR Web Service enables you to convert scanned documents to Text, Word, or PDF files

Edit: Sorry, I just read all your post and you mentioned that it's not free.

laviniut · May 20, 2013

I tried OCR example with a trial account on OCRWebService. But the application is never focusing on camera and when send picture, application stopped with error main_buildrequest (java line: 337) and after is java.lang.OutOfMemoryError.
I have Galaxy S2 and android 4.1.2
Why is that ?

Erel · May 20, 2013

You should decrease the picture size. You can change the size of the picture taken with CameraEx.SetPictureSize.

laviniut · May 20, 2013

i use this <code
Sub Camera1_Ready (Success As Boolean)
If Success Then
CamEx.SetContinuousAutoFocus
CamEx.SetJpegQuality(90)
CamEx.SetPictureSize(380, 480)
CamEx.CommitParameters
CamEx.StartPreview
Else
ToastMessageShow("Cannot open camera.", True)
End If
End Sub
code/>
but the same error.
i think CameraExClass is not working good for me, because autofocus is not working, and the size of picture taken is same (maximum).

Erel · May 21, 2013

Have you checked whether this picture size is supported? You should call GetSupportedPicturesSizes.

You should download the latest CameraEx class for an auto-focus feature.

laviniut · May 23, 2013

I updated CameraEx class. Thank you. Now autofocus is working. And yes, size i wanted for picture is not suported. So i have to set other size. But when i use Log(CamEx.GetSupportedPicturesSizes()) the result is [Lb4a.example.cameraexclass$_camerasize;@41240d80
so, how can i get picture sizes ?

laviniut · May 23, 2013

Now OCR example with my trial account is working.
but CamEx.SetContinuousAutoFocus is not working. only CamEx.FocusAndTakePicture is working.
i can set and get results with 800x480 picture size.

Erel · May 23, 2013

But when i use Log(CamEx.GetSupportedPicturesSizes()) the result is [Lb4a.example.cameraexclass$_camerasize;@41240d80
so, how can i get picture sizes ?

You should write:

B4X:

Dim l1 As List = CamEx.GetSupportedPicturesSizes

You can then go over the items in the list.

laviniut · May 23, 2013

Thank you. is working CamEx.GetSupportedPicturesSizes.

XverhelstX · Sep 1, 2013

You can do offline Optical Character Recognition with RSTessOcr which is available here:

http://www.b4x.com/android/forum/th...-optical-character-recognition-offline.32335/

Magics · Nov 6, 2013

Hi,
I followed this guide and i am registered on Ocrwebservice.com, but i can not figure out how to configure the application with my profile registered in ocrwebservice.com

I found this code in the project source:

B4X:

Sub BuildRequest (date () As Byte) As String
Dim req As String = template
req.Replace req = ("$ USER $", user)
req.Replace req = ("$ $ LICENSE" license)
req.Replace req = ("$ FILENAME $", tempfile)
Dim about As StringUtils
req.Replace req = ("$ DATE $", su.EncodeBase64 (date))
req.Replace req = ("$ $ LANGUAGE", "ENGLISH")
req.Replace req = ("$ OUTPUT $", "HTML")
Return req
end Sub

The fields "eg: $ USER $ - $ LICENSE $" are to be filled?
Iif the answer is yes.
I could give an example, how do I compile it?

Thanks in advance, Magics

Erel · Nov 6, 2013

You should set the two global variables:

B4X:

Private user = "ENTER USER", license = "LICENSE" As String

Magics · Nov 6, 2013

Thank you Erel, now I try and let you know!

Magics

sconlon · Jan 13, 2015

I have been trying this example and sending various pictures some with only a few words on them and each in perfect focus. Each time I get a Job successful but no text is displayed and I can see that the 1.XML document contains an error "Recognition failed". It also advises to contact support but before doing that I thought I would ask here in case someone might know what is going wrong. I have attached the latest picture I sent, it is 640x480.

Thanks,
SC

Erel · Jan 13, 2015

I no longer have an account with them so I cannot test it. Sorry.

NJDude · Jan 13, 2015

You can give THIS library a shot.

sconlon · Jan 13, 2015

I contacted their support and got a reply back saying they no longer supported HTML as an output format. I changed it to TXT and it worked fine and the results were quite good.

I will try NJDudes's library as well and see how it performs.

Thanks.

Tadeu Botelho · Apr 13, 2019

I'm really in need of a professional OCR service on android.
I'm having a problem trying to compile the APK to use the OCR service in this example.
I did not change the sources. I just included my trial username and registration key to use the service.
Can someone help me identify?
Thank you

GMan · Apr 13, 2019

The error message is clear: a class file was not found

Try to uncomment the line (its only a log entry) and try again

Android Tutorial [Example] Add OCR features to your Android application

Well-Known Member

Active Member

B4X founder

Active Member

B4X founder

Active Member

Active Member

B4X founder

Active Member

Well-Known Member

Member

B4X founder

Member

Active Member

Attachments

B4X founder

Expert

Active Member

Member

Attachments

Well-Known Member

Similar Threads