barcode.py

import pyzbar.pyzbar as pyzbar
import cv2


def detectBarcodes(img):
    codes = pyzbar.decode(img)
    for code in codes:
        print(f'type={code.type}')
        print(f'data={code.data}')
    return codes


if __name__ == "__main__":
    cap = cv2.VideoCapture(0)
    cap.set(cv2.CAP_PROP_FRAME_WIDTH, 800)
    cap.set(cv2.CAP_PROP_FRAME_HEIGHT, 600)

    while cap.isOpened():
        # capture frame
        ret, frame = cap.read()

        # convert frame to grayscale image for detection
        image = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

        # detect barcodes
        detections = detectBarcodes(image)

        for barcode in detections:
            points = barcode.polygon
            print(f'points={points}')

            # draw lines connecting points
            n = len(points)
            for i in range(0, n):
                # cv2.rectangle(frame, points[0], points[2], (255, 0, 0), 2)
                cv2.line(frame, points[i], points[(i + 1) % n], (255, 0, 0), 2)

            # draw data text
            x = barcode.rect.left
            y = barcode.rect.top
            print(f'coord x={x} y={y}')
            cv2.putText(frame, str(barcode.data), (x, y), cv2.FONT_HERSHEY_SIMPLEX, 1, (0, 0, 255), 1, cv2.LINE_AA)

        # render
        x = cv2.imshow('frame', frame)

        # exit on q
        key = cv2.waitKey(1)
        if cv2.getWindowProperty('frame', 0) == -1 or key & 0xFF == ord('q'):
            cv2.destroyAllWindows()
            break

    cap.release()