Hiding Information in Multiple Level-line Moirés

  title={Hiding Information in Multiple Level-line Moir{\'e}s},
  author={Thomas Walger and Roger D. Hersch},
Secure documents often comprise an information layer that is hard to reproduce. Moiré techniques for the prevention of counterfeiting rely on the superposition of an array of transparent lines or microlenses on top of a base layer containing hidden information. Level-line moirés consist of shapes that appear to be beating upon relative translation of a… CONTINUE READING