How to use these markers:
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These matrix-code markers are a 3x3 format with a parity-bit added, allowing up to 32 different markers to be identified with error detection (of 1 dot).

To enable the use of these markers in your ARToolKit program, add these lines to your setup code:

arSetPatternDetectionMode(arHandle, AR_MATRIX_CODE_DETECTION);
arSetMatrixCodeType(arHandle, AR_MATRIX_CODE_3x3_PARITY65);

More information on use of matrix code-mode can be found here:
https://github.com/artoolkitx/artoolkitx/wiki
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