Scanning QR Code and Barcodes

QR code scanner.py

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+from __future__ import print_function
+
+import pyzbar.pyzbar as pyzbar
+import numpy as np
+import cv2
+import time
+import sqlite3
+import json
+
+# get the webcam:  
+cap = cv2.VideoCapture(0)
+
+cap.set(3,640)
+cap.set(4,480)
+#160.0 x 120.0
+#176.0 x 144.0
+#320.0 x 240.0
+#352.0 x 288.0
+#640.0 x 480.0
+#1024.0 x 768.0
+#1280.0 x 1024.0
+time.sleep(2)
+
+def decode(im) : 
+    # Find barcodes and QR codes
+    decodedObjects = pyzbar.decode(im)
+    # Print results
+    for obj in decodedObjects:
+        print('Type : ', obj.type)
+        print('Data : ', obj.data,'\n')     
+    return decodedObjects
+
+db_conn = sqlite3.connect('scanned_items.db')
+db_cursor = db_conn.cursor()
+
+db_cursor.execute('CREATE TABLE IF NOT EXISTS scanned_items(id INTEGER PRIMARY KEY, item_name TEXT, quantity INTEGER);')
+
+font = cv2.FONT_HERSHEY_SIMPLEX
+
+while(cap.isOpened()):
+    # Capture frame-by-frame
+    ret, frame = cap.read()
+    # Our operations on the frame come here
+    im = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
+
+    decodedObjects = decode(im)
+
+    for decodedObject in decodedObjects: 
+        points = decodedObject.polygon
+
+        # If the points do not form a quad, find convex hull
+        if len(points) > 4 : 
+          hull = cv2.convexHull(np.array([point for point in points], dtype=np.float32))
+          hull = list(map(tuple, np.squeeze(hull)))
+        else : 
+          hull = points;
+
+        # Number of points in the convex hull
+        n = len(hull)     
+        # Draw the convext hull
+        for j in range(0,n):
+          cv2.line(frame, hull[j], hull[ (j+1) % n], (255,0,0), 3)
+
+        x = decodedObject.rect.left
+        y = decodedObject.rect.top
+
+        print(x, y)
+
+        print('Type : ', decodedObject.type)
+        print('Data : ', decodedObject.data,'\n')
+
+        barCode = str(decodedObject.data)
+        cv2.putText(frame, barCode, (x, y), font, 1, (0,255,255), 2, cv2.LINE_AA)
+
+        data = json.loads(decodedObject.data)
+
+        db_cursor.execute('SELECT * FROM scanned_items WHERE item_name=?', (data['item_name'],))
+        db_data = db_cursor.fetchall()
+        if not db_data:
+            db_cursor.execute('INSERT INTO scanned_items(item_name, quantity) VALUES(?,?);', (data['item_name'], data['quantity']))
+
+        db_conn.commit()       
+    # Display the resulting frame
+    cv2.imshow('frame',frame)
+    key = cv2.waitKey(1)
+    if key & 0xFF == ord('q'):
+        break
+    elif key & 0xFF == ord('s'): # wait for 's' key to save 
+        cv2.imwrite('Capture.png', frame)     
+
+# When everything done, release the capture
+cap.release()
+cv2.destroyAllWindows()
+db_conn.close()