Feature: support barcode upscaling for better detection of small barcodes (#3655)

src/documents/tests/test_barcodes.py

@@ -906,6 +906,47 @@ class TestAsnBarcode(DirectoriesMixin, TestCase):
                 input_doc,
             )
 
+    @override_settings(CONSUMER_BARCODE_SCANNER="PYZBAR")
+    def test_scan_file_for_qrcode_without_upscale(self):
+        """
+        GIVEN:
+            - A printed and scanned PDF document with a rather small QR code
+        WHEN:
+            - ASN barcode detection is run with default settings
+            - pyzbar is used for detection, as zxing would behave differently, and detect the QR code
+        THEN:
+            - ASN is not detected
+        """
+
+        test_file = self.BARCODE_SAMPLE_DIR / "barcode-qr-asn-000123-upscale-dpi.pdf"
+
+        with BarcodeReader(test_file, "application/pdf") as reader:
+            reader.detect()
+            self.assertEqual(len(reader.barcodes), 0)
+
+    @override_settings(CONSUMER_BARCODE_SCANNER="PYZBAR")
+    @override_settings(CONSUMER_BARCODE_DPI=600)
+    @override_settings(CONSUMER_BARCODE_UPSCALE=1.5)
+    def test_scan_file_for_qrcode_with_upscale(self):
+        """
+        GIVEN:
+            - A printed and scanned PDF document with a rather small QR code
+        WHEN:
+            - ASN barcode detection is run with 600dpi and an upscale factor of 1.5 and pyzbar
+            - pyzbar is used for detection, as zxing would behave differently.
+              Upscaling is a workaround for detection problems with pyzbar,
+              when you cannot switch to zxing (aarch64 build problems of zxing)
+        THEN:
+            - ASN 123 is detected
+        """
+
+        test_file = self.BARCODE_SAMPLE_DIR / "barcode-qr-asn-000123-upscale-dpi.pdf"
+
+        with BarcodeReader(test_file, "application/pdf") as reader:
+            reader.detect()
+            self.assertEqual(len(reader.barcodes), 1)
+            self.assertEqual(reader.asn, 123)
+
 
 @pytest.mark.skipif(
     not HAS_ZXING_LIB,