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Related Concept Videos

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...
Reducing Line Loss01:18

Reducing Line Loss

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 in...
Traveling Waves: Lossless Lines01:27

Traveling Waves: Lossless Lines

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.
Boundary Conditions: Lossless Lines01:21

Boundary Conditions: Lossless Lines

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...
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...
Lossless Lines01:23

Lossless Lines

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, exhibits...

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Related Experiment Video

Updated: Jul 7, 2026

Quantifying Intermembrane Distances with Serial Image Dilations
07:45

Quantifying Intermembrane Distances with Serial Image Dilations

Published on: September 28, 2018

Line-based, reduced memory, wavelet image compression.

C Chrysafis1, A Ortega

  • 1Hewlett-Packard Laboratories, Palo Alto, CA 94304, USA. chrysafi@hpl.hp.com

IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society
|February 8, 2008
PubMed
Summary

This study introduces a novel line-based system for low memory wavelet image compression. It achieves high performance comparable to state-of-the-art methods while significantly reducing memory requirements.

Related Experiment Videos

Last Updated: Jul 7, 2026

Quantifying Intermembrane Distances with Serial Image Dilations
07:45

Quantifying Intermembrane Distances with Serial Image Dilations

Published on: September 28, 2018

Area of Science:

  • Image Processing
  • Computer Vision
  • Data Compression

Background:

  • Wavelet transform and subband coding offer superior image compression compared to traditional methods.
  • Implementing these techniques in low memory environments without performance loss remains a challenge.

Purpose of the Study:

  • To develop a complete system for low memory wavelet image compression.
  • To address memory constraints in wavelet transform and coding processes.

Main Methods:

  • A line-based approach processes images line by line, minimizing memory usage.
  • A novel context-based encoder utilizes local wavelet coefficients, avoiding global information storage.
  • Synchronization between encoder and decoder memory is managed effectively.

Main Results:

  • The line-based wavelet transform achieves identical results to standard implementations.
  • The proposed low memory coder demonstrates performance comparable to state-of-the-art methods.
  • Memory utilization is significantly reduced compared to existing high-performance coders.

Conclusions:

  • The developed system offers an efficient solution for low memory wavelet image compression.
  • This approach enables high-performance image compression even with limited memory resources.
  • It overcomes previous limitations in implementing advanced compression techniques on memory-constrained platforms.