Xueying Han, Qi Wang, Naixin Ge. Anti-Counterfeiting Method of Phase-Modulated Latent Images Based on Frequency Modulation[J]. Acta Optica Sinica, 2019, 39(8): 0805001
- Acta Optica Sinica
- Vol. 39, Issue 8, 0805001 (2019)
Fig. 1. Principle of error diffusion screening
Fig. 2. FM screening image
Fig. 3. FM latent images. (a) Diagram of dot displacement; (b) anti-counterfeiting image; (c) enlarged latent image
Fig. 4. FM latent images extracted by linear grating. (a) Extracted latent image; (b) enlarged extraction area
Fig. 5. Grating type. (a) Linear grating; (b) irregular grating
Fig. 6. Flow chart of experiment
Fig. 7. FM latent images extracted by irregular grating. (a) Extracted latent image; (b) enlarged extraction area
Fig. 8. Extraction effect of latent image in mid-bright tone area. (a) Latent image; (b) enlarged extraction area
Fig. 9. Extraction effect of latent image in dark tone area. (a) Latent image; (b) enlarged extraction area
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