Singapore license plate

[Hien Linh Nguyen]

Hi all,

I'm adding singapore license plate to openalpr. So far I've trained the OCR with Singapore plates font and the result is ok so far. I'm uploading here all the files needed to use sg and another country code. Anyone with common interest are more than welcome to test it out. Perhaps we can collaborate to improve the results. 

Please note that it's working on 1-line plates only. 2 line plates requires a huge number of positive images to train, which I haven't got the time fore. I'm happy to contribute the images I've got so far to build a common dataset to further train the detector.

You should put sg.conf to runtimedata/config
lsg.traineddata to runtimedata/ocr/tessdata
sg.patterns to runtimedata/patterns
sg.xml to runtimedata/regions

Re install openalpr and it should work.

Best,

Linh

[Matt]

Excellent!  Thanks, Linh.

If you can can post your original image data as well, that would be helpful for others since they would be able to add more images and retrain the dataset to improve accuracy.  If you post it here, I can grab the files and add them to the dataset.  Alternatively, you can fork and add a pull request to these repos:

https://github.com/openalpr/train-ocr

https://github.com/openalpr/train-detector

Feel free to post whatever you have for your two line plates as well.  Perhaps we can keep adding to it until we have enough.  I'm in the same boat for European plates, I have about 600 or so.  I would need 1000 minimum for a viable detector.

-Matt

[Hien Linh Nguyen]

Hey Matt,

I'm not sure whether it's okay to share the original images publicly since license plate data is private. Anyone interested can email me and I will share the whole folder (which has around 350 1-line plates and 140 2-line plates)

I used the EU plate detector and it seems to work well for SG plates. Do you want to try adding the SG 2-line plates to use together with EU 2-line for training the 2-line plate detector? I will share to your email if you need.

I have retrained the OCR on a new set of data (the 350 1-line plates), which sums up to around 2.3k characters (boy cropping the plates and classifying the characters  took a long time!).  The new OCR file is attached and seems to improve a lot from the previous one. Previously it sometimes confuses 0 with Q, but the new one classify the 2 quite well.

Maybe sometimes next week I will collect more data but I doubt if I can collect more than 200 2-lines plates.

Thanks,

Linh

[Hien Linh Nguyen]

A weird thing I noted: upon using the new lsg.trainedata and run alpr, i got this error:

*** Error in `alpr': double free or corruption (out): 0x000000000276ed40 ***

Aborted (core dumped)

Any ideas what this is about? Sorry I'm not that familiar with C++ debugging. I suspect it's because the new traineddata is much larger (since I used around 2.2k characters)

On Tuesday, September 22, 2015 at 8:59:44 PM UTC+8, Matt wrote:

[Matt]

Any luck resolving this?  Are you training with the same version of Tesseract that is compiled into OpenALPR?

[nglin...@gmail.com]

Hey I got it through by training using tesseract 3.03. It seems fine now. Thanks!

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[Khai Cher Lim]

Hi Hien Linh,

Thank you for training OCR with SG plates. I'm wondering which release of openAlpr did you use? I have a limitation where I have to use Windows. Thus i got my release from https://github.com/openalpr/openalpr/releases . After putting your files in the respective directories, I still didn't manage to recognize any SG car plates. Any help in this matter? Thank you. =)

[Hien Linh Nguyen]

Hi Khai Cher,

I cloned the repository and built it on the local environment. What was the command you ran and what was the corresponding output?

Linh

[Khai Cher Lim]

Hi Linh, 

I guess you are running on linux/mac os environment? I guess probably its more straight forward to set up.

I ran the command "alpr -c sg pathToImages/xxx.jpg"

[nglin...@gmail.com]

And what wad the output? No plates detected?

You can try copy the eu.xml in runtime_data/region and trname it to sg.xml then try run that command again

—
Sent from mobile

[Khai Cher Lim]

Hi Linh,

Thanks. It works. Good job done =)

[mikhail ulanday]

Good day sir Linh Nguyen would you mind helping me or teaching me how to train as well in openalpr. Im new with openalpr but there are aspects of the training part that I don't seem to get. thanks :) I'll be training for the Philippine plates :)

[Hien Linh Nguyen]

Hey Mikhail you can check this page

https://github.com/openalpr

look into train-ocr and train-detector. The train-ocr is for training character recognition, whereas train-detector is to detect the plate.

Hope that helps

[Minh Hung Le]

Hi Linh, would you please add config for Vietnamese plates?

Regards,

Hung Le

[Reverse Slice]

Hi Linh

I wonder if you could share the folder with me? I have sent a pm to you.


Chris

[akshay....@ranosys.com]

Hi i required traineddata file for iniad anpr system, can you please share the file if you have, Thanks (My mail - akshay....@ranosys.com)

[Panya Yattham]

Hi Linh,

May I have your advise or step of compile and train new country license plate. I'm no luck with that the step on wiki or internet not have enough details and out-date. I got errors hopeless to solve it by myself.

Thank you

Panya

On Tuesday, September 22, 2015 at 5:28:14 PM UTC+7, Hien Linh Nguyen wrote:

[Xi Peng]

Hi LInh,

I am working on Singapore double line license plate detection. I have prepared 900 sample images and could I ask you what are correct procedures to train the detection? I am confused about train-ocr and train-detetor since you used train-ocr for single line license plate but you mentioned train-detector is used for license plate detection. Should I use train-ocr as you did previously?

Thanks
Mike

[Willie]

Hi Linh, Mike and Matt,

Do any of you happen to already have a pretty decent sg2.xml (for 2 lines Singapore plate) file?

If you do, is it possible to share with me?

Many thanks,

Willie

[Ying Jie Lim]

Hi all,

I found this sg2.xml file from another forum.

https://groups.google.com/forum/#!topic/openalpr/6GyMg2lJ3OI

[Tyler Buchman]

Im looking for a data set of labeled Singapore license plates, is it possible to use yours? Also, is there a license on this data set? Thanks for your consideration!

On Friday, September 25, 2015 at 8:53:54 AM UTC-7, Hien Linh Nguyen wrote: