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Related Concept Videos

Reducing Line Loss01:18

Reducing Line Loss

223
In a three-phase circuit, line loss is an indicator of energy dissipated as heat due to the resistance of transmission lines. To address this, incorporating transformers into the system—a step-up transformer at the source and a step-down transformer at the load—is a strategic solution. Two three-phase transformers are introduced to improve this.
With a step-up transformer at the source, the voltage is increased, thereby reducing the current in the transmission lines since power loss...
223
Boundary Conditions: Lossless Lines01:21

Boundary Conditions: Lossless Lines

181
Consider a single-phase, two-wire, lossless transmission line terminated by an impedance at the receiving end and a source with Thevenin voltage and impedance at the sending end. The line, with length, has a surge impedance and wave velocity determined by the line's inductance and capacitance.
At the receiving end, the boundary condition states that the voltage equals the product of the receiving-end impedance and current. This relationship is expressed as a function of the incident and...
181
Lossless Lines01:23

Lossless Lines

193
In electrical engineering, a lossless transmission line is characterized by a purely imaginary propagation constant and a resistive characteristic impedance. The ABCD parameters, which describe the relationship between the input and output voltages and currents, indicate an equivalent π circuit with an imaginary series impedance and a shunt admittance. This results in a transmission line that, when the product of the phase constant (beta) and the length of the line is less than pi,...
193
Imaging Studies for Cardiovascular System VI: Calcium -Scoring CT01:25

Imaging Studies for Cardiovascular System VI: Calcium -Scoring CT

166
Calcium-Scoring CT ScanA calcium-scoring CT scan, also known as coronary artery calcium (CAC) scan, detects calcium deposits in the coronary arteries. This test assesses the risk of coronary artery disease (CAD), which can lead to cardiovascular events such as angina, heart failure, and sudden cardiac arrest.A calcium-scoring CT scan is generally recommended for individuals at intermediate risk of CAD without symptoms. It includes:Men aged 40-75 and women aged 50-75: Especially those with a...
166
Traveling Waves: Lossless Lines01:27

Traveling Waves: Lossless Lines

218
The provided content explores the behavior of traveling waves on single-phase lossless transmission lines. It begins with a single-phase two-wire lossless transmission line of length Δx, characterized by a loop inductance LH/m and a line-to-line capacitance C F/m. These parameters result in a series inductance LΔx  and a shunt capacitance CΔx.
218
Convolution: Math, Graphics, and Discrete Signals01:24

Convolution: Math, Graphics, and Discrete Signals

504
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.
To simplify the convolution integral, it is assumed that both the input signal and impulse response are zero for negative time values. The graphical convolution process...
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Related Experiment Video

Updated: Oct 22, 2025

Automated Analysis of Dynamic Ca2+ Signals in Image Sequences
06:49

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Joint Lossless Image Compression and Encryption Scheme Based on CALIC and Hyperchaotic System.

Miao Zhang1, Xiaojun Tong1, Zhu Wang2

  • 1School of Computer Science and Technology, Harbin Institute of Technology, Weihai 264209, China.

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

This study introduces a novel method for simultaneously compressing and encrypting images losslessly using a context-based adaptive lossless image codec (CALIC) and a hyperchaotic system. The approach ensures high security and maintains excellent lossless compression performance with minimal impact.

Keywords:
CALIChyperchaotic systemlossless image compression and encryptionpseudo-random sequence

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Area of Science:

  • Digital Image Processing
  • Cryptography
  • Information Security

Background:

  • Efficient and secure image transmission and storage are critical.
  • Joint compression and encryption offer enhanced security and efficiency.
  • Lossless compression is essential for preserving image quality in critical applications.

Purpose of the Study:

  • To propose a joint lossless image compression and encryption scheme.
  • To achieve simultaneous lossless encryption and compression.
  • To enhance image security without significantly compromising compression performance.

Main Methods:

  • Utilized a context-based adaptive lossless image codec (CALIC).
  • Integrated a novel four-dimensional hyperchaotic system for encryption.
  • Implemented four distinct encryption locations within the CALIC framework: predicted pixel values (GAP), prediction error, prediction mode data, and entropy coding file.
  • Employed plaintext-related encryption using table lookup for enhanced security.

Main Results:

  • Achieved high security with information entropy of 7.997, correlation of 0.01, and key sensitivity of 0.4998.
  • Demonstrated a minimal reduction in compression ratio (only 6.3%) compared to the original CALIC.
  • Verified the effectiveness of the proposed encryption locations and hyperchaotic system.

Conclusions:

  • The proposed joint lossless image compression and encryption scheme offers a promising solution for secure and high-quality image storage and transmission.
  • The method effectively balances high security with good lossless compression performance.
  • The integration of CALIC and a hyperchaotic system provides a robust framework for joint image processing tasks.