Toshiba B-EP Series Interface Specification page 433

(9) Explanation for QR code
Error correction level
The QR code contains functions to detect and correct an error. If one of the data
characters is damaged, the information can be restored when this code is read.
There are 4 levels that can be designated. The level should be specified according to
usage. The general correction ability is as follows.
Level
High density level
Standard level
Reliability level
High reliability level
1-cell width
Selection of mode
All codes including alphanumerics, symbols, and Kanji can be used in one QR code.
Manual mode or automatic mode can be selected to perform the operation.
When automatic mode is selected, FFH cannot be used. However, this data can be
used in manual mode.
Selection of model
Model 1: Original specification
Model 2: Extended specification which enhances the function of position correction
and can contain a large amount of data.
Mask number
To be sure the QR code is read, it is preferable that white and black modules are
arranged in this symbol in a balanced manner.
"1011101", which is characteristically seen in the position detecting pattern, from
appearing in the symbol as much as possible.
The mask number is 0 to 7. The pattern is determined by placing each masking
pattern for the mask number upon the module pattern. When the mask number is set
to 8, masking is not performed. When the parameter is omitted, the most appropriate
mask number is automatically selected to perform masking.
CHAPTER 6 LABEL MODE (INTERFACE COMMANDS)
Error correction ability
Low
High
6-52
Overhead by correcting
an error
7%
15%
25%
30%
1-cell width
This prevents the bit pattern
B-EP Series
1-cell width