patterns

MIC occurs throughout the printed document in repeating sequences. It consists of a two-dimensional matrix in which a dot represents a truth value.
The pattern determines the method and rules of sequential MIC writing. It is quite common for multiple manufacturers to use the same pattern type, or for one manufacturer to use multiple patterns on different printer models.
One printer can only use one type of pattern.

reversed L

Pattern code: rl
Encoded informations: manufacturer, model, unique printer identifier
Manufacturers: HP, Kyocera, Lexmark, Okidata, Ricoh, Printing alliance (HP + Canon)
Learn more about "reversed L"

corner

Pattern code: cn
Encoded informations: unique printer identifier
Manufacturers: Konica Minolta, Epson
Learn more about "corner"

xerox (gen. 1)

Pattern code: xr
Encoded informations: serial number, print method, date/time of printing
Manufacturers: Xerox, Epson, Dell
Learn more about "xerox (gen. 1)"

xerox (gen. 2)

Pattern code: xx
Encoded informations: unknown
Manufacturers: Xerox

double dot

Pattern code: dd
Encoded informations: serial number
Manufacturers: Ricoh, NRG, Lanier, Savin
Learn more about "double dot"

skewed

Pattern code: sw
Encoded informations: unique printer identifier
Manufacturers: Canon
Learn more about "skewed"

unexplored patterns

Based on the analysis of data from the EFF dataset, two more patterns were discovered, the frequency of which is very low, and therefore their properties are not sufficiently documented.

double type

Pattern code: dt
Encoded informations: unknown
Manufacturers: Konica Minolta

big triangle

Pattern code: bt
Encoded informations: unknown
Manufacturers: Canon