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Related Concept Videos

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Masking and Demasking Agents

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EDTA titrations may necessitate masking and demasking agents to temporarily protect a particular metal ion in a mixture from the EDTA reaction. These agents facilitate the sequential analysis of the metal ions by forming stable complexes with some—but not all—metal ions during certain steps.
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Convolution computations can be simplified by utilizing their inherent properties.
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In any LTI (Linear Time-Invariant) system, the convolution of two signals is denoted using a convolution operator, assuming all initial conditions are zero. The convolution integral can be divided into two parts: the zero-input or natural response and the zero-state or forced response, with t0 indicating the initial time.
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Related Experiment Video

Updated: Nov 19, 2025

A Methodology for Capturing Joint Visual Attention Using Mobile Eye-Trackers
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A Methodology for Capturing Joint Visual Attention Using Mobile Eye-Trackers

Published on: January 18, 2020

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Joint Image Encryption and Screen-Cam Robust Two Watermarking Scheme.

Weitong Chen1,2,3, Na Ren1,2,3, Changqing Zhu1,2,3

  • 1Key Laboratory of Virtual Geographic Environment (Nanjing Normal University), Ministry of Education, Nanjing 210023, China.

Sensors (Basel, Switzerland)
|January 27, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces a novel joint encryption and watermarking method for secure image sharing. The scheme enables smartphone-based watermark extraction and robust leakage tracking, even from screen captures.

Keywords:
chaotic mappingdiscrete fourier transformimage encryptionrobust watermarkingscreen-cam processsmartphone

Related Experiment Videos

Last Updated: Nov 19, 2025

A Methodology for Capturing Joint Visual Attention Using Mobile Eye-Trackers
12:39

A Methodology for Capturing Joint Visual Attention Using Mobile Eye-Trackers

Published on: January 18, 2020

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Area of Science:

  • Computer Science
  • Information Security
  • Digital Image Processing

Background:

  • Protecting digital images from unauthorized access and leakage is crucial.
  • Existing methods often struggle with robustness against screen capture and decryption requirements.

Purpose of the Study:

  • To develop a joint encryption and screen-camera robust watermarking scheme.
  • To enable watermark extraction using smartphones and track information leakage from sneak shots.

Main Methods:

  • A dual watermarking algorithm embedding watermarks in the Discrete Fourier Transform (DFT) domain and QR code encoding.
  • Chaotic mapping-based segment encryption for enhanced robustness.
  • Frame locating and noise component analysis for watermark detection from recaptured images.

Main Results:

  • The proposed scheme demonstrates high security and robustness against screen capture, both before and after image decryption.
  • Effective watermark detection and message extraction are achieved even with significant quality degradation.
  • The dual watermarking approach ensures high capacity and error correction.

Conclusions:

  • The joint encryption and watermarking scheme offers a robust solution for secure image distribution and leakage tracking.
  • The method is effective for smartphone-based verification and resilient to common image processing attacks.