diff --git a/Dockerfile b/Dockerfile
index 25c5814..dc57ecb 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -7,7 +7,7 @@ COPY . .
 ARG RUN_TESTS=true
 
 RUN apt-get update && apt-get install -y libzbar0 python3-opencv nano \
-    && pip install -r requirements.txt \
+    && pip install --no-cache-dir -r requirements.txt \
     && if [ "$RUN_TESTS" = "true" ]; then /extract/run_pytest.sh; else echo "Not running tests..."; fi
 
 WORKDIR /files
diff --git a/Dockerfile_no_qr_reader b/Dockerfile_no_qr_reader
index d7f737e..1750cd6 100644
--- a/Dockerfile_no_qr_reader
+++ b/Dockerfile_no_qr_reader
@@ -9,7 +9,7 @@ ARG RUN_TESTS=true
 RUN apk add --no-cache nano zlib jpeg \
     && echo "Arch: $(apk --print-arch)" \
     && if [[ "$(apk --print-arch)" == "aarch64" ]]; then apk add --no-cache --virtual .build-deps gcc libc-dev python3-dev py3-setuptools zlib-dev jpeg-dev; fi \
-    && pip install protobuf qrcode Pillow \
+    && pip install --no-cache-dir protobuf qrcode Pillow \
     && if [[ "$(apk --print-arch)" == "aarch64" ]]; then apk del .build-deps; fi \
     && if [[ "$RUN_TESTS" == "true" ]]; then /extract/run_pytest.sh test_extract_otp_secret_keys_pytest.py -k "not qreader" --relaxed; else echo "Not running tests..."; fi
 
diff --git a/README.md b/README.md
index eacb9f4..6e97788 100644
--- a/README.md
+++ b/README.md
@@ -266,6 +266,19 @@ pip install git+https://github.com/scito/extract_otp_secret_keys
 python -m extract_otp_secret_keys
 ```
 
+#### For development
+
+```
+pip install git+https://github.com/scito/extract_otp_secret_keys@support_img_read
+python -m extract_otp_secret_keys
+```
+
+```
+# pip install -e git+https://github.com/scito/extract_otp_secret_keys@$(git ls-remote  git@github.com:scito/extract_otp_secret_keys@support_img_read.git | head -1 | awk '{print $1;}')#egg=extract_otp_secret_keys
+pip3.11 install -e git+https://github.com/scito/extract_otp_secret_keys.git@$(git ls-remote git@github.com:scito/extract_otp_secret_keys.git | grep support_img_read | head -1 | awk '{print $1;}')#egg=extract_otp_secret_keys
+python -m extract_otp_secret_keys
+```
+
 #### Example
 
 ```
@@ -330,10 +343,10 @@ docker run --rm -v "$(pwd)":/files:ro extract_otp_secret_keys example_export.png
 ```
 
 docker run --rm -v "$(pwd)":/files:ro -i extract_otp_secret_keys = < example_export.png
-docker run --rm -v "$(pwd)":/files:ro -i --device="/dev/video0:/dev/video0" --env="DISPLAY" -v /tmp/.X11-unix:/tmp/.X11-unix extract_otp_secret_keys
-docker run --pull always --rm -v "$(pwd)":/files:ro -i --device="/dev/video0:/dev/video0" --env="DISPLAY" -v /tmp/.X11-unix:/tmp/.X11-unix scit0/extract_otp_secret_keys
+docker run --rm -v "$(pwd)":/files:ro -i --device="/dev/video0:/dev/video0" --env="DISPLAY" -v /tmp/.X11-unix:/tmp/.X11-unix:ro extract_otp_secret_keys
+docker run --pull always --rm -v "$(pwd)":/files:ro -i --device="/dev/video0:/dev/video0" --env="DISPLAY" -v /tmp/.X11-unix:/tmp/.X11-unix:ro scit0/extract_otp_secret_keys
 docker run --entrypoint /bin/bash -it --rm -v "$(pwd)":/files:ro extract_otp_secret_keys
-docker run --entrypoint /bin/bash -it --rm -v "$(pwd)":/files:ro --device="/dev/video0:/dev/video0" --env="DISPLAY" -v /tmp/.X11-unix:/tmp/.X11-unix scit0/extract_otp_secret_keys
+docker run --entrypoint /bin/bash -it --rm -v "$(pwd)":/files:ro --device="/dev/video0:/dev/video0" --env="DISPLAY" -v /tmp/.X11-unix:/tmp/.X11-unix:ro scit0/extract_otp_secret_keys
 docker run --pull always --rm -v "$(pwd)":/files:ro -i scit0/extract_otp_secret_keys
 docker run --entrypoint /extract/run_pytest.sh --rm -v "$(pwd)":/files:ro extract_otp_secret_keys
 
diff --git a/extract_otp_secret_keys.py b/extract_otp_secret_keys.py
index 0ec87a8..17152b8 100644
--- a/extract_otp_secret_keys.py
+++ b/extract_otp_secret_keys.py
@@ -57,6 +57,12 @@ from qrcode import QRCode
 
 import protobuf_generated_python.google_auth_pb2
 
+
+def abort(*args, **kwargs):
+    eprint(*args, **kwargs)
+    sys.exit(1)
+
+
 try:
     import cv2
     import numpy
@@ -183,7 +189,7 @@ def extract_otps_from_camera(args):
                 cv2.polylines(img, [pts], True, rect_color_success if otp_url else rect_color, rect_thickness)
                 extract_otps_from_otp_url(otp_url, otp_urls, otps, args)
         else:
-            assert False, f"ERROR: Wrong QReader mode {qreader.name}"
+            assert False, f"ERROR: Wrong QReader mode {qr_mode.name}"
 
         cv2.putText(img, f"Mode: {qr_mode.name} (Hit space to change)", pos_text, font, font_scale, text_color, font_thickness, font_line)
         cv2.putText(img, "Hit ESC to quit", tuple(map(add, pos_text, font_dy)), font, font_scale, text_color, font_thickness, font_line)
@@ -530,10 +536,5 @@ def eprint(*args, **kwargs):
     print(*args, file=sys.stderr, **kwargs)
 
 
-def abort(*args, **kwargs):
-    eprint(*args, **kwargs)
-    sys.exit(1)
-
-
 if __name__ == '__main__':
     sys_main()