adds autoscaling of resized images

Author: hornig

qr_code_extractor.py

@@ -3,6 +3,7 @@
 
 def get_qr_data(file, debug_show_image=False):
     position_marker_coordinates = None
+    max_pixels = 600
     input_image = cv2.imread(file, cv2.IMREAD_COLOR)
     payload, bounding_box, rectified_image = cv2.QRCodeDetector().detectAndDecode(input_image)
 
@@ -11,9 +12,24 @@ def get_qr_data(file, debug_show_image=False):
 
         if debug_show_image:
             cv2.circle(input_image, position_marker_coordinates, 10, (0, 255, 0), -1)
-            cv2.namedWindow('highlighted image', cv2.WINDOW_KEEPRATIO)
-            cv2.resizeWindow('highlighted image', 1280, 960)
-            cv2.imshow("highlighted image", input_image)
+
+            base = input_image.shape[0]
+            if base < input_image.shape[1]:
+                base = input_image.shape[1]
+
+            if max_pixels > input_image.shape[0] and max_pixels > input_image.shape[1]:
+                scale_percent = 100.0  # percent of original size
+            else:
+                scale_percent = max_pixels / base * 100.0
+
+            width = int(input_image.shape[1] * scale_percent / 100)
+            height = int(input_image.shape[0] * scale_percent / 100)
+            dim = (width, height)
+
+            # resize image
+            resized = cv2.resize(input_image, dim, interpolation=cv2.INTER_AREA)
+
+            cv2.imshow("highlighted image", resized)
             cv2.waitKey(0)
 
     return payload, position_marker_coordinates