How much text can be overlayed on a Dataglyph?
A. DataGlyphs contain error correction that can allow a successful decode despite damage. One popular type of “damage” is overlayed text or images. To the first order, the amount of text we can overlay is directly proportional to the error correction level. Here are some examples showing text overlay, which were produced by addding more and more text until we have just about exhausted the ability of error correction. Hence these are maximum scenarios that assume a clean printing and imaging process. If you expect additional damage (from dirt, scan noise, or other sources) you should increase the error correction beyond what is illustrated in these examples.
