Datamatrix with raspberry - python-3.x

Question

I am trying to read datamatrix code by rasp using python.
I'm using pylibdmtx to read the code, but it only works on my notebook. When I put the same code on the raspberry it can't read the code. At the moment my raspberry is reading only qrcode and barcode.
I have two rasp one with raspbian and the other with ubuntu core, neither of which worked.
An example code below
import cv2
import time
from pylibdmtx.pylibdmtx import decode
data = None
video = cv2.VideoCapture(0)
video.set(cv2.CAP_PROP_FPS, 19)
while video.isOpened():
time.sleep(1/9)
ret, frame = video.read()
if ret is False:
break
decodeObjects = decode(frame,
timeout=1000,
max_count=1,
corrections=3)
for obj in decodeObjects:
if obj.data:
data = obj
if data:
break
video.release()
cv2.destroyAllWindows()
print(data)

Answer 1

pylibdmtx is just a wrapper for libdmtx. To make it work, you have to install the native library first.
The .whl file has already contained the .DLL file for Windows:
As for macOS and Linux, you can install the library via command-line tools.
Mac OS X:
brew install libdmtx
Linux:
sudo apt-get install libdmtx0a
I suppose there's no pre-built library for Raspberry Pi. So you can build it by yourself. Here is the source code:
https://github.com/dmtx/libdmtx
Take 3 steps to build and install the libdmtx library:
$ ./configure
$ make
$ sudo make install
After installing the libdmtx library, your Python code should work.

Answer 2

import cv2
import time
from pylibdmtx.pylibdmtx import decode
data = None
video = cv2.VideoCapture(0)
video.set(cv2.CAP_PROP_FPS, 19)
# Add
saveFilename = "./liveImage.jpg"
while video.isOpened():
time.sleep(1/9)
ret, frame = video.read()
if ret is False:
break
# Add - save Live Image
liveImage = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
cv2.imwrite(saveFilename, liveImage)
# Add - open File
loadImage = cv2.imread(saveFilename)
# Modify
decodeObjects = decode(loadImage,
timeout=1000,
max_count=1,
corrections=3)
for obj in decodeObjects:
if obj.data:
data = obj
if data:
break
video.release()
cv2.destroyAllWindows()
print(data)

Answer 3

import cv2
import time
from pylibdmtx.pylibdmtx import decode
data = None
video = cv2.VideoCapture(0)
video.set(cv2.CAP_PROP_FPS, 19)
# Add
saveFilename = "./liveImage.jpg"
while video.isOpened():
time.sleep(1/9)
ret, frame = video.read()
if ret is False:
break
# Add - save Live Image
liveImage = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
cv2.imwrite(saveFilename, liveImage)
# Add - open File
loadImage = cv2.imread(saveFilename)
# Modify
decodeObjects = decode(loadImage,
# Delete timeout=1000,
max_count=1,
corrections=3)
for obj in decodeObjects:
if obj.data:
data = obj
if data:
break
video.release()
cv2.destroyAllWindows()
print(data)