A simple ROS package for generating QR codes. This package is useful to encode data into QR Codes.
A QR code is composed of many little squares, called modules, which represent encoded data, with additional error correction (allowing partially damaged QR codes to still be read).
The version of a QR code is a number between 1 and 40 (inclusive), which indicates the size of the QR code. The width and height of a standard QR code are always equal (it is square) and are equal to 4 * version + 17. Later, this generated QR is resized to the desired dimensions.
The level of error correction is a number between 0 and 3 (inclusive), or can be one of the symbolic names ECC_LOW, ECC_MEDIUM, ECC_QUARTILE and ECC_HIGH. Higher levels of error correction sacrifice data capacity, but allow a larger portion of the QR code to be damaged or unreadable.
Launching the node
roslaunch qr_generator qr_generator.launch
Requesting for a QR Code
rosservice call /qr_generator_ros/generate_qr "data: 'I will display ♠'
error_correction_type: 2
qr_version: 6"
Generated QR Code
