How to use com.google.zxing.client.j2se.CommandLineRunner with only _part_ of an image?

[User]

Hi,

I was wondering how I could use the CommandLineRunner (java -cp javase
\javase.jar;core\core.jar
com.google.zxing.client.j2se.CommandLineRunner [File]) to only process
part of an image. What I have are many large resolution images with
barcodes and the coordinates of the barcode on each image.
For example, in this image (img35.imageshack[.]us/img35/5220/
barsample.png ), the barcode is inside the rectangular region with a
top left corner of coordinates (206,41) and bottom right coordinates
of (1337, 165). Of course, the real images I use are much larger and
the barcode is in a relatively smaller region.

For efficiency, can ZXing (through commandline) to directly look only
at the rectangular region holding the barcode from this image itself.
I could write this region to a temporary file and pass this to ZXing
manually, but this will be very inefficient.

Anybody have any ideas of a command I could use to do this?

Thank you in advance!

[Sean Owen]

Yes, you'll need a very little bit of hacking though. Inside
CommandLineRunner, find where it creates a
BufferedImageLuminanceSource. This constructor can take four more int
parameters, the left/top coordinate and width/height of a rectangular
subregion to examine.

[User]

Thanks for the quick response, but I do not know Java. :'-( Also, I
would need to do this every time I upgrade ZXing.

If possible, can I request this feature be added to ZXing's command
line runner as it will be useful for other users as well?

[Sean Owen]

Easy enough, I just added this arg:

--crop=left,top,width,height

For your original example:

--crop=206,41,1131,124

[User]

I rebuilt the java classes with ant and it works!
Thank you so much for your help.

Best regards.

[Stilgar Dragonclaw]

Hi, I have android in Cyanogenmod version and I try launch BarcodeScanner (com.google.zxing.client.android) in Terminal Emulator (jackpal.androidterm)

I am using these sequence code:

$ java -cp javase
\javase.jar;core\core.jar
com.google.zxing.client.j2se.CommandLineRunne--crop=206,41,1131,124

or:

$ java -cp javase
\javase.jar;core\core.jar
com.google.zxing.client.android.CommandLineRunne--crop=206,41,1131,124

and these code:

$ adb shell am start -n com.google.zxing.client.android.CommandLineRunne

Does anyone know how to run a BS ZXing in Android terminal?

Thx for advice and tips.

[Lachezar Dobrev]

The command-line runner is targeted towards a Java VM, not Android.
The Android application is an interactive application. They're based
on the same ZXing core functionality, but realise different
functionality and are not interchangeable.

That said, I am not familiar with Cyanogen Mod, but I do not believe
it has a Java (SE) VM, so no command-line runner there.

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[Stilgar Dragonclaw]

Yep, here is correct tree / package path: https://github.com/zxing/zxing/tree/master/android/src/com/google/zxing/client/android

It will be suffice, when someone shows me the script to run zxing barcodescanner in android terminal.
Just what is called when you click on the application icon.

Does anyone know?

THX