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Text information security protection method based on computer-generated holograms
Applied Optics
|June 10, 2024
Summary
This study introduces a novel point-sampling computer-generated hologram (CGH) method using ray tracing to embed text information. The technique effectively hides data within CGHs, ensuring high fidelity and imperceptibility.
Area of Science:
- Optics and Photonics
- Computer Graphics
- Information Security
Background:
- Computer-generated holograms (CGHs) are increasingly complex due to faster ray tracing.
- Growing applications of CGHs for information hiding lack comprehensive research.
- Need for robust methods to embed and protect information within CGHs.
Purpose of the Study:
- To propose and evaluate a point-sampling CGH method for secure information hiding.
- To assess the effectiveness of embedding depth-encoded text information.
- To analyze the information density and imperceptibility of the proposed method.
Main Methods:
- Utilized ray tracing for rapid sampling of text information at various depths.
- Employed discrete cosine transform (DCT) to embed depth-encoded text into a carrier image.
- Evaluated image quality using Peak Signal-to-Noise Ratio (PSNR).
Main Results:
- Achieved a PSNR of 29.56 dB between original and hidden images, indicating good data integrity.
- Attained a PSNR of 51.66 dB between the original and embedded carrier images, ensuring visual imperceptibility.
- Determined maximum information density for computational holograms at 200x200 resolution.
Conclusions:
- The proposed point-sampling CGH method effectively hides information with high fidelity.
- The method offers strong protection for generated CGHs, making embedded data difficult to detect.
- Identified optimal resolution for maximum information density in computational holograms.
