Hidden images in halftone pictures

Joseph Rosen, Bahram Javidi

Research output: Contribution to journalArticlepeer-review

74 Scopus citations


A method of concealing an image in a different halftone image is proposed. Continuous-tone levels of the visible images are represented by the area of the halftone dots. However, the hidden image is encoded by the dots’ positions inside their cells. Only a spatial correlator with a unique filter function can reveal the hidden image from the halftone picture. The technique and its robustness to noise and distortions are demonstrated.

Original languageEnglish
Pages (from-to)3346-3353
Number of pages8
JournalApplied Optics
Issue number20
StatePublished - 10 Jul 2001


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