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Barcode Scanner and Visualizer #999

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Barcode Scanner and Visualizer
HamzaYslmn Oct 2, 2025
497f18e
Refactor barcode scanning functionality to use OpenCV for image proce…
HamzaYslmn Oct 7, 2025
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70 changes: 70 additions & 0 deletions wrappers/python/demo_read_show.py
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Original file line number Diff line number Diff line change
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# pip install opencv-python numpy zxing-cpp httpx
from typing import Union
import sys
import cv2
import numpy as np
import zxingcpp
import httpx


def get_image_bytes(source: Union[str, bytes]) -> bytes:
"""Load image bytes from URL, file path, or bytes."""
if isinstance(source, bytes):
return source
if source.startswith(("http://", "https://")):
with httpx.Client() as client:
response = client.get(source)
response.raise_for_status()
return response.content
with open(source, "rb") as f:
return f.read()


def scan_and_display(source: Union[str, bytes]):
"""Scan barcodes from image source and display results."""
image_bytes = get_image_bytes(source)
img_array = np.frombuffer(image_bytes, dtype=np.uint8)
img = cv2.imdecode(img_array, cv2.IMREAD_COLOR)

if img is None:
raise ValueError("Failed to decode image")

results = zxingcpp.read_barcodes(img)

if not results:
print("No barcode found")
return

for barcode in results:
print(f"Text: {barcode.text}")
print(f"Format: {barcode.format.name}")
print(f"Content Type: {barcode.content_type.name}")

pts = np.array([
[barcode.position.top_left.x, barcode.position.top_left.y],
[barcode.position.top_right.x, barcode.position.top_right.y],
[barcode.position.bottom_right.x, barcode.position.bottom_right.y],
[barcode.position.bottom_left.x, barcode.position.bottom_left.y]
], dtype=np.int32)

cv2.polylines(img, [pts], isClosed=True, color=(0, 0, 255), thickness=3)

scale = min(800 / img.shape[0], 1200 / img.shape[1], 1.0)
if scale < 1.0:
img = cv2.resize(img, (int(img.shape[1] * scale), int(img.shape[0] * scale)))

cv2.imshow('Barcode Scan Result', img)
cv2.waitKey(0)
cv2.destroyAllWindows()


if __name__ == "__main__":
if len(sys.argv) > 1:
source = sys.argv[1]
else:
source = "https://upload.wikimedia.org/wikipedia/commons/thumb/3/39/Databar_14_00075678164125.png/250px-Databar_14_00075678164125.png"

try:
scan_and_display(source)
except Exception as e:
print(f"Error: {e}")