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Related Concept Videos

Linear Approximation in Frequency Domain01:26

Linear Approximation in Frequency Domain

Linear systems are characterized by two main properties: superposition and homogeneity. Superposition allows the response to multiple inputs to be the sum of the responses to each individual input. Homogeneity ensures that scaling an input by a scalar results in the response being scaled by the same scalar.
In contrast, nonlinear systems do not inherently possess these properties. However, for small deviations around an operating point, a nonlinear system can often be approximated as linear.
Downsampling01:20

Downsampling

When considering a sampled sequence with zero values between sampling instants, one can replace it by taking every N-th value of the sequence. At these integer multiples of N, the original and sampled sequences coincide. This process, known as decimation, involves extracting every N-th sample from a sequence, thereby creating a more efficient sequence.
The Fourier transform of the decimated sequence reveals a combination of scaled and shifted versions of the original spectrum. This...
Upsampling01:22

Upsampling

Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...

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Related Experiment Video

Updated: May 22, 2026

Characterization of Anisotropic Leaky Mode Modulators for Holovideo
09:36

Characterization of Anisotropic Leaky Mode Modulators for Holovideo

Published on: March 19, 2016

Oriented modulation for watermarking in direct binary search halftone images.

Jing-Ming Guo1, Chang-Cheng Su, Yun-Fu Liu

  • 1Department of Electrical Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan. jmguo@seed.net.tw

IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society
|May 15, 2012
PubMed
Summary
This summary is machine-generated.

This study introduces a novel halftoning-based watermarking method for high pixel-depth embedding (up to 3 bits) without compromising image quality. The technique offers efficient and robust watermark data processing for printing applications.

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Area of Science:

  • Digital image processing
  • Information security

Background:

  • Digital watermarking is crucial for copyright protection and data integrity.
  • Existing methods often face trade-offs between watermark capacity and image quality.

Purpose of the Study:

  • To develop a high pixel-depth watermarking technique.
  • To maintain high image quality during watermark embedding.
  • To ensure robustness for printing applications.

Main Methods:

  • Integration of parallel oriented high-efficient direct binary search (DBS) halftoning with orientation modulation (OM).
  • Utilizing halftone texture orientations to encode watermark data.
  • Employing least-mean-square-trained filters and a naïve Bayes classifier for watermark decoding.

Main Results:

  • Successful embedding of watermarks with pixel depths up to 3 bits.
  • Preservation of high image quality with minimal degradation.
  • Demonstrated processing efficiency and robustness suitable for printing.

Conclusions:

  • The DBS-based OM method provides an effective solution for high-capacity, high-quality digital watermarking.
  • The technique is well-suited for practical applications in printing.
  • Future work could explore further optimizations for robustness and capacity.