Open ALPR scripts

[load...@yahoo.com]

Hello

I'm working on a project and after looong time made my Open ALPR to work on my Raspberry Pi v1 model B + USB Webcam

It can process images perfectly.

I'm new to working in Raspberry Pi so I don't know much.

My next steps would be that OpenALPR reads a plate and that I somehow connect it to a database.and that it goes through already saved records or saves new ( This is my part ) and shows results.

Now my issue is how do I even start a script like this one?

It would be a python script but I have no idea how to load one.

I've been through OpenALPR documentation but just got really confused :(

Any help is welcome.

Thanks

[Matt]

Here's a good example for running OpenALPR in Python:

https://github.com/openalpr/openalpr/blob/master/src/bindings/python/test.py

Python has libraries for just about any database you'd want to use. 

[load...@yahoo.com]

Hello again

Got an issue now.

http://i.imgur.com/MkllAG0.png?1

alpr webcam works and I have used "us" plates as it was in this script.

Now when I run this scrip it gives me this error :/

[Timis Daniel]

Think I can help you with this.

Basically Alpr is writing the results to the Beanstalk message queue or the alpr lib is returning the results encoded in Json format.

I got around this by importing a Json library I use to decode the results.

Try this guide: http://www.tutorialspoint.com/json/json_python_example.htm you can start from here.

I did something like

import demjson

...

job = beanstalk.reserve()

jobb = job.body

result = demjson.decode(jobb)

plate = d['results'][0]['plate']

uuid = d['uuid']

if you are using the daemon you can check out the data structure of the result here :

https://github.com/openalpr/openalpr/wiki/OpenALPR-Daemon-(alprd)

hope this helps in any way.

[load...@yahoo.com]

Thanks for replying

Installed 2.2.4 version but still same error.

Also no idea how to work around daemon :/

Tried some simple scripts that would just read the plate and show the code but no success.

[load...@yahoo.com]

Finally made some scripts to work but this "test" scrip gives me this error: http://i.imgur.com/2wfjSTv.png?1

Script:

from openalpr import Alpr

from argparse import ArgumentParser

parser = ArgumentParser(description='OpenALPR Python Test Program')

parser.add_argument("-c", "--country", dest="country", action="store", default="us",

                  help="License plate Country" )

parser.add_argument("--config", dest="config", action="store", default="/etc/openalpr/openalpr.conf",

                  help="Path to openalpr.conf config file" )

parser.add_argument("--runtime_data", dest="runtime_data", action="store", default="/usr/share/openalpr/runtime_data",

                  help="Path to OpenALPR runtime_data directory" )

parser.add_argument('plate_image', help='License plate image file')

options = parser.parse_args()

alpr = None

try:

    alpr = Alpr(options.country, options.config, options.runtime_data)

    if not alpr.is_loaded():

        print("Error loading OpenALPR")

    else:

        print("Using OpenALPR " + alpr.get_version())

        alpr.set_top_n(7)

        alpr.set_default_region("wa")

        alpr.set_detect_region(False)

        jpeg_bytes = open(options.plate_image, "rb").read()

        results = alpr.recognize_array(jpeg_bytes)

        # Uncomment to see the full results structure

        # import pprint

        # pprint.pprint(results)

        print("Image size: %dx%d" %(results['img_width'], results['img_height']))

        print("Processing Time: %f" % results['processing_time_ms'])

        i = 0

        for plate in results['results']:

            i += 1

            print("Plate #%d" % i)

            print("   %12s %12s" % ("Plate", "Confidence"))

            for candidate in plate['candidates']:

                prefix = "-"

                if candidate['matches_template']:

                    prefix = "*"

                print("  %s %12s%12f" % (prefix, candidate['plate'], candidate['confidence']))

finally:

    if alpr:

        alpr.unload()

[Timis Daniel]

think you need to specify the extension of the image

[load...@yahoo.com]

I'm not a programmer but. I went through whole script and checked from where it is supposed to take out settings and it should work :/

I honestly have no idea.