Hidden Images in Halftone Pictures
Applied Optics, Vol. 40, Issue 20, pp. 3346-3353 doi:10.1364/AO.40.003346
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- 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
Citation
Joseph Rosen and Bahram Javidi, "Hidden Images in Halftone Pictures," Appl. Opt. 40, 3346-3353 (2001)
http://www.opticsinfobase.org/abstract.cfm?URI=ao-40-20-3346
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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
[Optical Society of America ]
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