Openalpr: 'Alpr' object has no attribute 'loaded'

[henriqueblobato]

I believe it is a problem that some people may face in the future

Things I already did:

Install openalpr:

sudo apt-get update && sudo apt-get install -y openalpr openalpr-daemon openalpr-utils libopenalpr-dev

Install wit the bash:

bash <(curl http://deb.openalpr.com/install)
git clone https://github.com/openalpr/openalpr.git
cd openalpr/src/bindings/python/
python setup.py install

Applying the binding

cd src/bindings/python/
python<version> setup.py install

Importing at eclipse and coping the PYTHON example as showed at here

from openalpr import Alpr

alpr = Alpr("us", "/path/to/openalpr.conf", "/path/to/runtime_data")
if not alpr.is_loaded():
    print("Error loading OpenALPR")
    sys.exit(1)

alpr.set_top_n(20)
alpr.set_default_region("md")

results = alpr.recognize_file("/path/to/image.jpg")

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']))

# Call when completely done to release memory
alpr.unload()

But after all this im getting the error:

Traceback (most recent call last):
  File "***.py", line 10, in <module>
    alpr = Alpr("eu", "/etc/openalpr/openalpr.conf", "***/runtime_data")
  File "/usr/local/lib/python3.5/dist-packages/openalpr/openalpr.py", line 85, in __init__
    self._recognize_raw_image_func = self._openalprpy_lib.recognizeRawImage
  File "/usr/lib/python3.5/ctypes/__init__.py", line 360, in __getattr__
    func = self.__getitem__(name)
  File "/usr/lib/python3.5/ctypes/__init__.py", line 365, in __getitem__
    func = self._FuncPtr((name_or_ordinal, self))
AttributeError: /usr/lib/libopenalprpy.so: undefined symbol: recognizeRawImage
Exception ignored in: <bound method Alpr.__del__ of <openalpr.openalpr.Alpr object at 0x7fac75d2da20>>
Traceback (most recent call last):
  File "/usr/local/lib/python3.5/dist-packages/openalpr/openalpr.py", line 258, in __del__
    if self.is_loaded():
  File "/usr/local/lib/python3.5/dist-packages/openalpr/openalpr.py", line 135, in is_loaded
    if not self.loaded:
AttributeError: 'Alpr' object has no attribute 'loaded'

Why this is happening?

EDIT:
The installation by rpm its the non-comercial (free) version, which its callable only by terminal, while the bash installation require a comercial license

[r1me]

recognizeRawImage is not available in release build (2.3.0) of Python wrapper. You will have to build master to get latest openalprpy.dll or remove definition of recognizeRawImage in openalpr.py

[tlawork]

Can you please create a release 2.3.1 which includes the definition of recognizeRawImage - please. I am having trouble compiling master manually. (aside - visual studio 2015 is hard to get and 2017 (current free version of studio) is not supported)

[klwlau]

I have the same problem, anyone know how to solve it?

[sleebapaul]

@klwlau and @tlawork follow this comment.

[klwlau]

@sleebapaul this solve my problem! thanks so much

[memoricab]

TBH not a nice solution but,

If you don't use recognize_ndarray; removing it from the source code worked for me as @r1me mentioned.
Because I used easiest way to install alpr libraries and I found that it was not updated as git master so there was missing function.

[HanyuuLu]

I met with this problem when I was trying to run openalpr on raspberry and I haven't found a solution fits my problem yet.

[rishabhoswal]

Traceback (most recent call last):
File "allapi.py", line 36, in
alpr = Alpr("us", "/etc/openalpr/openalpr.conf", "/usr/share/openalpr/runtime_data")
File "/home/zm/code/main/detection/openCVYolo/alpr/python/openalpr/openalpr.py", line 85, in __init__
self._recognize_raw_image_func = self._openalprpy_lib.recognizeRawImage
File "/usr/lib/python3.6/ctypes/__init__.py", line 361, in __getattr__
func = self.__getitem__(name)
File "/usr/lib/python3.6/ctypes/__init__.py", line 366, in __getitem__
func = self._FuncPtr((name_or_ordinal, self))
AttributeError: /usr/lib/libopenalprpy.so: undefined symbol: recognizeRawImage
Exception ignored in: >
Traceback (most recent call last):
File "/home/zm/code/main/detection/openCVYolo/alpr/python/openalpr/openalpr.py", line 258, in __del__
if self.is_loaded():
File "/home/zm/code/main/detection/openCVYolo/alpr/python/openalpr/openalpr.py", line 135, in is_loaded
if not self.loaded:
AttributeError: 'Alpr' object has no attribute 'loaded'

no solution seems to work in my case.
Help

[robertmzm]

recognizeRawImage is not available in release build (2.3.0) of Python wrapper. You will have to build master to get latest openalprpy.dll or remove definition of recognizeRawImage in openalpr.py

once I get the binding setup, I commented out the following lines in /opt/anaconda3/lib/python3.7/site-packages/openalpr and it runs just fine