diff --git a/README.md b/README.md
index 464a716..ed786ea 100644
--- a/README.md
+++ b/README.md
@@ -1,8 +1,8 @@
 # Extract TOTP/HOTP secret keys from Google Authenticator
 
-[![CI Status](https://github.com/scito/extract_otp_secret_keys/actions/workflows/ci.yml/badge.svg)](https://github.com/scito/extract_otp_secret_keys/actions/workflows/ci.yml)
+[![CI tests](https://github.com/scito/extract_otp_secret_keys/actions/workflows/ci.yml/badge.svg)](https://github.com/scito/extract_otp_secret_keys/actions/workflows/ci.yml)
 ![coverage](https://img.shields.io/badge/coverage-95%25-brightgreen)
-[![docker](https://github.com/scito/extract_otp_secret_keys/actions/workflows/ci_docker.yml/badge.svg)](https://github.com/scito/extract_otp_secret_keys/actions/workflows/ci_docker.yml)
+[![CI docker](https://github.com/scito/extract_otp_secret_keys/actions/workflows/ci_docker.yml/badge.svg)](https://github.com/scito/extract_otp_secret_keys/actions/workflows/ci_docker.yml)
 ![PyPI - Python Version](https://img.shields.io/pypi/pyversions/protobuf)
 [![GitHub Pipenv locked Python version](https://img.shields.io/github/pipenv/locked/python-version/scito/extract_otp_secret_keys)](https://github.com/scito/extract_otp_secret_keys/blob/master/Pipfile.lock)
 ![protobuf version](https://img.shields.io/badge/protobuf-4.21.12-informational)
@@ -16,7 +16,8 @@ TODO add src/
 TODO rename extract_otp_secret_keys
 
 Extract two-factor authentication (2FA, TFA, OTP) secret keys from export QR codes of "Google Authenticator" app.
-The secret and otp values can be printed and exported to json or csv. The QR codes can be printed or saved as PNG images.
+The QR codes can captured from the camera in a GUI, imported from images or from text files containing the QR code data.
+The secret and otp values can be printed and exported to json or csv, as well as printed or saved as PNG images.
 
 ## Installation
 
@@ -25,7 +26,7 @@ cd extract_otp_secret_keys
 
 ## Usage
 
-### Capture QR codes from camera
+### Capture QR codes from camera (since v2.0.0)
 
 1. Open "Google Authenticator" app on the mobile phone
 2. Export the QR codes from "Google Authenticator" app
@@ -36,7 +37,7 @@ cd extract_otp_secret_keys
 
 ![CV2 Capture from camera screenshot](cv2_capture_screenshot.png)
 
-### With builtin QR decoder from image files
+### With builtin QR decoder from image files (since v2.0.0)
 
 1. Open "Google Authenticator" app on the mobile phone
 2. Export the QR codes from "Google Authenticator" app
@@ -59,7 +60,7 @@ cd extract_otp_secret_keys
 
 ## Program help: arguments and options
 
-<pre>usage: extract_otp_secrets.py [-h] [--camera NUMBER] [--qr {QREADER,DEEP_QREADER,ZBAR,CV2,CV2_WECHAT}] [--json FILE] [--csv FILE] [--keepass FILE] [--printqr] [--saveqr DIR] [--no-color] [--verbose | --quiet] [infile ...]
+<pre>usage: extract_otp_secrets.py [-h] [--camera NUMBER] [--qr {ZBAR,QREADER,QREADER_DEEP,CV2,CV2_WECHAT}] [--json FILE] [--csv FILE] [--keepass FILE] [--printqr] [--saveqr DIR] [--no-color] [--verbose | --quiet] [infile ...]
 
 Extracts one time password (OTP) secret keys from QR codes, e.g. from Google Authenticator app.
 If no infiles are provided, the QR codes are interactively captured from the camera.
@@ -71,7 +72,7 @@ positional arguments:
 options:
   -h, --help                    show this help message and exit
   --camera NUMBER, -C NUMBER    camera number of system (default camera: 0)
-  --qr {QREADER,DEEP_QREADER,ZBAR,CV2,CV2_WECHAT}, -Q {QREADER,DEEP_QREADER,ZBAR,CV2,CV2_WECHAT}
+  --qr {ZBAR,QREADER,QREADER_DEEP,CV2,CV2_WECHAT}, -Q {ZBAR,QREADER,QREADER_DEEP,CV2,CV2_WECHAT}
                                 QR reader (default: ZBAR)
   --json FILE, -j FILE          export json file or - for stdout
   --csv FILE, -c FILE           export csv file or - for stdout
@@ -102,40 +103,11 @@ For protobuf versions 3.14.0 or similar or Python 3.6, use the extract_otp_secre
 
 ### Shared libs installation for reading QR code images
 
-For reading QR code images the zbar library must be installed.
-If you do not extract directly from images, you do not need to install the zbar shared library.
+For reading QR code images the zbar library must be installed for `ZBAR` QR reader.
+If you do not extract directly from images or using catpuring from camera, you do not need to install the zbar shared library.
 
 For a detailed installation documentation of [pyzbar](https://github.com/NaturalHistoryMuseum/pyzbar#installation).
 
-#### Windows
-
-The zbar DLLs are included with the Windows Python wheels. On other operating systems, you will need to install the zbar shared library.
-
-TODO Write installation, not error message
-
-##### Windows error message
-
-If you see an ugly ImportError when importing [pyzbar](https://pypi.org/project/pyzbar/) on Windows you will most likely need the [Visual C++ Redistributable Packages for Visual Studio 2013](https://www.microsoft.com/en-US/download/details.aspx?id=40784). Install vcredist_x64.exe if using 64-bit Python, vcredist_x86.exe if using 32-bit Python.
-
-```
-Traceback (most recent call last):
-  File "C:\Users\Admin\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.11_qbz5n2kfra8p0\LocalCache\local-packages\Python311\site-packages\pyzbar\zbar_library.py", line 58, in load
-    dependencies, libzbar = load_objects(Path(''))
-                            ^^^^^^^^^^^^^^^^^^^^^^
-  File "C:\Users\Admin\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.11_qbz5n2kfra8p0\LocalCache\local-packages\Python311\site-packages\pyzbar\zbar_library.py", line 50, in load_objects
-    deps = [
-           ^
-  File "C:\Users\Admin\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.11_qbz5n2kfra8p0\LocalCache\local-packages\Python311\site-packages\pyzbar\zbar_library.py", line 51, in <listcomp>
-    cdll.LoadLibrary(str(directory.joinpath(dep)))
-  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.11_3.11.496.0_x64__qbz5n2kfra8p0\Lib\ctypes\__init__.py", line 454, in LoadLibrary
-    return self._dlltype(name)
-           ^^^^^^^^^^^^^^^^^^^
-  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.11_3.11.496.0_x64__qbz5n2kfra8p0\Lib\ctypes\__init__.py", line 376, in __init__
-    self._handle = _dlopen(self._name, mode)
-                   ^^^^^^^^^^^^^^^^^^^^^^^^^
-FileNotFoundError: Could not find module 'libiconv.dll' (or one of its dependencies). Try using the full path with constructor syntax.
-```
-
 #### Linux (Debian, Ubuntu, ...)
 
     sudo apt-get install libzbar0
@@ -152,6 +124,10 @@ FileNotFoundError: Could not find module 'libiconv.dll' (or one of its dependenc
 
     brew install zbar
 
+#### Windows
+
+The zbar DLLs are included with the Windows Python wheels. However, you might need to install [Visual C++ Redistributable Packages for Visual Studio 2013](https://www.microsoft.com/en-US/download/details.aspx?id=40784). Install vcredist_x64.exe if using 64-bit Python, vcredist_x86.exe if using 32-bit Python.
+
 ## Examples
 
 ### Printing otp secrets form text file
@@ -193,7 +169,12 @@ FileNotFoundError: Could not find module 'libiconv.dll' (or one of its dependenc
 
 * Free and open source
 * Supports Google Authenticator exports (and compatible apps like Aegis Authenticator)
-* Captures the the QR codes directly from the camera using QR code detection (based on OpenCV)
+* Captures the the QR codes directly from the camera using different QR code readers (based on OpenCV)
+    * ZBAR: fast and reliable, good for images and video capture (default/recommended) [pyzbar](https://github.com/NaturalHistoryMuseum/pyzbar)
+    * QREADER: fast [QReader](https://github.com/Eric-Canas/QReader)
+    * QREADER_DEEP: slow, not good for camera [QReader](https://github.com/Eric-Canas/QReader)
+    * CV2: fast [QRCodeDetector](https://docs.opencv.org/4.x/de/dc3/classcv_1_1QRCodeDetector.html)
+    * CV2_WECHAT: fast [WeChatQRCode](https://docs.opencv.org/4.x/dd/d63/group__wechat__qrcode.html)
 * Supports TOTP and HOTP
 * Generates QR codes
 * Exports to various formats:
@@ -390,6 +371,8 @@ docker run --rm -v "$(pwd)":/files:ro extract_otp_secrets example_export.txt
 docker run --rm -v "$(pwd)":/files:ro extract_otp_secrets example_export.png
 ```
 
+TODO link to docker/github repos
+
 docker run --rm -v "$(pwd)":/files:ro -i extract_otp_secrets = < example_export.png
 docker run --rm -v "$(pwd)":/files:ro -i --device="/dev/video0:/dev/video0" --env="DISPLAY" -v /tmp/.X11-unix:/tmp/.X11-unix:ro extract_otp_secrets
 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_secrets
@@ -410,6 +393,17 @@ docker pull scit0/extract_otp_secrets_only_txt
 docker pull ghcr.io/scito/extract_otp_secrets
 docker pull ghcr.io/scito/extract_otp_secrets_only_txt
 
+### Docker examples
+
+
+docker run --pull always --rm -v \"$(pwd)\":/files:ro scit0/extract_otp_secrets example_export.png
+
+docker run --pull always --rm -i -v \"$(pwd)\":/files:ro scit0/extract_otp_secrets_only_txt - < example_export.txt
+
+cat example_export.txt | docker run --pull always --rm -i -v \"$(pwd)\":/files:ro scit0/extract_otp_secrets_only_txt - -c - > example_out.csv
+
+docker run --pull always --rm -v "$(pwd)":/files:ro -i --device="/dev/video0:/dev/video0" --env="DISPLAY" -v /tmp/.X11-unix:/tmp/.X11-unix:ro scit0/extract_otp_secrets
+
 ## Tests
 
 ### PyTest
@@ -484,6 +478,35 @@ pip install -U -r requirements.txt
 
 https://github.com/opencv/opencv/issues/23072
 
+## Problems and Troubleshooting
+
+### Windows error message
+
+If you see an ugly ImportError on Windows you will most likely need the [Visual C++ Redistributable Packages for Visual Studio 2013](https://www.microsoft.com/en-US/download/details.aspx?id=40784). Install vcredist_x64.exe if using 64-bit Python, vcredist_x86.exe if using 32-bit Python.
+
+This library shared library is required by [pyzbar](https://pypi.org/project/pyzbar/).
+
+```
+Traceback (most recent call last):
+  File "C:\Users\Admin\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.11_qbz5n2kfra8p0\LocalCache\local-packages\Python311\site-packages\pyzbar\zbar_library.py", line 58, in load
+    dependencies, libzbar = load_objects(Path(''))
+                            ^^^^^^^^^^^^^^^^^^^^^^
+  File "C:\Users\Admin\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.11_qbz5n2kfra8p0\LocalCache\local-packages\Python311\site-packages\pyzbar\zbar_library.py", line 50, in load_objects
+    deps = [
+           ^
+  File "C:\Users\Admin\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.11_qbz5n2kfra8p0\LocalCache\local-packages\Python311\site-packages\pyzbar\zbar_library.py", line 51, in <listcomp>
+    cdll.LoadLibrary(str(directory.joinpath(dep)))
+  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.11_3.11.496.0_x64__qbz5n2kfra8p0\Lib\ctypes\__init__.py", line 454, in LoadLibrary
+    return self._dlltype(name)
+           ^^^^^^^^^^^^^^^^^^^
+  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.11_3.11.496.0_x64__qbz5n2kfra8p0\Lib\ctypes\__init__.py", line 376, in __init__
+    self._handle = _dlopen(self._name, mode)
+                   ^^^^^^^^^^^^^^^^^^^^^^^^^
+FileNotFoundError: Could not find module 'libiconv.dll' (or one of its dependencies). Try using the full path with constructor syntax.
+```
+
+
+
 ## Related projects
 
 * [ZBar](https://github.com/mchehab/zbar) is an open source software suite for reading bar codes from various sources, including webcams.
diff --git a/build.sh b/build.sh
index e75d827..03bfd2e 100755
--- a/build.sh
+++ b/build.sh
@@ -82,6 +82,7 @@ interactive=true
 ignore_version_check=true
 clean=false
 build_docker=true
+run_gui=true
 
 while test $# -gt 0; do
     case $1 in
@@ -94,6 +95,7 @@ while test $# -gt 0; do
             echo "-a                      Automatic mode"
             echo "-C                      Ignore version check"
             echo "-D                      No docker build"
+            echo "-G                      No not run gui"
             echo "-c                      Clean"
             echo "-h, --help              Help"
             quit
@@ -110,6 +112,10 @@ while test $# -gt 0; do
             build_docker=false
             shift
             ;;
+        -G)
+            run_gui=false
+            shift
+            ;;
         -c)
             clean=true
             shift
@@ -204,7 +210,7 @@ fi
 
 # Upgrade pip requirements
 
-cmd="sudo pip install --upgrade pip"
+cmd="sudo pip install -U pip"
 if $interactive ; then askContinueYn "$cmd"; else echo -e "${cyan}$cmd${reset}";fi
 eval "$cmd"
 
@@ -266,7 +272,7 @@ eval "$cmd"
 
 # pip install
 
-cmd="$PIP install -e ."
+cmd="$PIP install -U -e ."
 if $interactive ; then askContinueYn "$cmd"; else echo -e "${cyan}$cmd${reset}";fi
 eval "$cmd"
 
@@ -324,6 +330,7 @@ if $build_docker; then
     if $interactive ; then askContinueYn "$cmd"; else echo -e "${cyan}$cmd${reset}";fi
     eval "$cmd"
 
+
     # Build extract_otp_secrets (Debian)
     cmd="docker build . -t extract_otp_secrets --pull --build-arg RUN_TESTS=false"
     if $interactive ; then askContinueYn "$cmd"; else echo -e "${cyan}$cmd${reset}";fi
@@ -333,7 +340,11 @@ if $build_docker; then
     if $interactive ; then askContinueYn "$cmd"; else echo -e "${cyan}$cmd${reset}";fi
     eval "$cmd"
 
-    cmd="docker run --rm -i -v \"$(pwd)\":/files:ro extract_otp_secrets - < example_export.txt"
+    cmd="cat mple_export.txt | docker run --rm -i -v \"$(pwd)\":/files:ro extract_otp_secrets - -c - > example_output.csv"
+    if $interactive ; then askContinueYn "$cmd"; else echo -e "${cyan}$cmd${reset}";fi
+    eval "$cmd"
+
+    cmd="docker run --rm -i -v \"$(pwd)\":/files:ro extract_otp_secrets = < example_export.png"
     if $interactive ; then askContinueYn "$cmd"; else echo -e "${cyan}$cmd${reset}";fi
     eval "$cmd"
 
@@ -344,10 +355,20 @@ if $build_docker; then
     cmd="docker image prune -f || echo 'No docker image pruned'"
     if $interactive ; then askContinueYn "$cmd"; else echo -e "${cyan}$cmd${reset}";fi
     eval "$cmd"
+
+    if $run_gui; then
+        cmd="docker run --pull always --rm -v "$(pwd)":/files:ro --device=\"/dev/video0:/dev/video0\" --env=\"DISPLAY\" -v /tmp/.X11-unix:/tmp/.X11-unix:ro extract_otp_secrets &"
+        if $interactive ; then askContinueYn "$cmd"; else echo -e "${cyan}$cmd${reset}";fi
+    fi
+    eval "$cmd"
 fi
 
-cmd="$PYTHON src/extract_otp_secrets.py &"
-if $interactive ; then askContinueYn "$cmd"; else echo -e "${cyan}$cmd${reset}";fi
-eval "$cmd"
+if $run_gui; then
+    cmd="$PYTHON src/extract_otp_secrets.py &"
+    if $interactive ; then askContinueYn "$cmd"; else echo -e "${cyan}$cmd${reset}";fi
+    eval "$cmd"
+fi
+
+echo -e "${greenBold}Sucessful${reset}"
 
 quit
diff --git a/src/extract_otp_secrets.py b/src/extract_otp_secrets.py
index d7423a0..2900b83 100644
--- a/src/extract_otp_secrets.py
+++ b/src/extract_otp_secrets.py
@@ -1,3 +1,4 @@
+# TODO rewrite
 # Extract two-factor authentication (2FA, TFA) secret keys from export QR codes of "Google Authenticator" app
 #
 # Usage:
@@ -118,7 +119,7 @@ Otps = List[Otp]
 # workaround for PYTHON <= 3.9: OtpUrls = list[OtpUrl]
 OtpUrls = List[OtpUrl]
 
-QRMode = Enum('QRMode', ['QREADER', 'DEEP_QREADER', 'ZBAR', 'CV2', 'CV2_WECHAT'], start=0)
+QRMode = Enum('QRMode', ['ZBAR', 'QREADER', 'QREADER_DEEP', 'CV2', 'CV2_WECHAT'], start=0)
 
 
 # Constants
@@ -256,9 +257,9 @@ def extract_otps_from_camera(args: Args) -> Otps:
             log_error("Failed to capture image from camera")
             break
         try:
-            if qr_mode in [QRMode.QREADER, QRMode.DEEP_QREADER]:
+            if qr_mode in [QRMode.QREADER, QRMode.QREADER_DEEP]:
                 found, bbox = qreader.detect(img)
-                if qr_mode == QRMode.DEEP_QREADER:
+                if qr_mode == QRMode.QREADER_DEEP:
                     otp_url = qreader.detect_and_decode(img, True)
                 elif qr_mode == QRMode.QREADER:
                     otp_url = qreader.decode(img, bbox) if found else None
@@ -448,8 +449,8 @@ def convert_img_to_otp_url(filename: str, args: Args) -> OtpUrls:
 
         qr_mode = QRMode[args.qr]
         otp_urls: OtpUrls = []
-        if qr_mode in [QRMode.QREADER, QRMode.DEEP_QREADER]:
-            otp_url = QReader().detect_and_decode(img, qr_mode == QRMode.DEEP_QREADER)
+        if qr_mode in [QRMode.QREADER, QRMode.QREADER_DEEP]:
+            otp_url = QReader().detect_and_decode(img, qr_mode == QRMode.QREADER_DEEP)
             otp_urls.append(otp_url)
         elif qr_mode == QRMode.CV2:
             otp_url, _, _ = cv2.QRCodeDetector().detectAndDecode(img)