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Applied Optics

Applied Optics


  • Vol. 40, Iss. 20 — Jul. 10, 2001
  • pp: 3346–3353

Hidden images in halftone pictures

Joseph Rosen and Bahram Javidi  »View Author Affiliations

Applied Optics, Vol. 40, Issue 20, pp. 3346-3353 (2001)

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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.

© 2001 Optical Society of America

OCIS Codes
(050.1380) Diffraction and gratings : Binary optics
(070.2580) Fourier optics and signal processing : Paraxial wave optics
(070.4550) Fourier optics and signal processing : Correlators
(070.4560) Fourier optics and signal processing : Data processing by optical means
(070.6110) Fourier optics and signal processing : Spatial filtering
(090.1760) Holography : Computer holography
(100.2810) Image processing : Halftone image reproduction

Original Manuscript: October 24, 2000
Revised Manuscript: March 12, 2001
Published: July 10, 2001

Joseph Rosen and Bahram Javidi, "Hidden images in halftone pictures," Appl. Opt. 40, 3346-3353 (2001)

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