QR Code in Command Line

# encode
brew install qrencode
qrencode --margin=1 --size 100 --type=png --output=qrcode.png https://www.google.com

# decode
brew install zbar
zbarimg qrcode.png

Reference

• libdecodeqr

Data Matrix in Command Line

brew install dmtx-utils
# encode
echo "hello world" | dmtxwrite -o data_matrix.png

# decode
dmtxread data_matrix.png

Seam carving

Accoring to wikipedia, seam carving is an algorithm for image resizing.

brew search liblqr

# install wx module through brew, visit [here](http://superuser.com/questions/196197/installing-wxpython-via-pip-or-easy-install) for more info
brew install wxpython

Reference

• fugenschnitzer the free small Seam Carving Programm for Windows, Mac, and Linux.
• use otool to detect library dependencies
• simpler seam carving

Reference

• software-to-read-a-qr-code on askubuntu