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Related Concept Videos

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...
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...
Pulse amplitude and quality01:17

Pulse amplitude and quality

Pulse amplitude is a crucial indicator of cardiac health because it provides valuable insights into the strength of left ventricular contractions and the overall uniformity of blood circulation within the vasculature. The strength of the pulse is directly related to the force with which the heart contracts and the volume of blood being pumped.
A weak or absent pulse may indicate reduced cardiac output or poor left ventricular contraction, which can be signs of cardiovascular dysfunction or...
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...
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.
Uniform Depth Channel Flow01:27

Uniform Depth Channel Flow

Uniform depth channel flow keeps fluid depth consistent along channels such as irrigation canals. In natural channels, such as rivers, approximate uniform flow is often assumed. This condition occurs when the channel’s bottom slope matches the energy slope, balancing potential energy lost from gravity with head loss due to shear stress. This balance prevents depth changes along the channel length, resulting in a steady, uniform flow.Uniform flow in open channels with a constant cross-section...

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Related Experiment Video

Updated: Jul 7, 2026

High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques
11:34

High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques

Published on: December 3, 2013

Foveated video compression with optimal rate control.

S Lee1, M S Pattichis, A C Bovik

  • 1Bell Laboratories, Lucent Technologies, Murray Hill, NJ 07974, USA.

IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society
|February 6, 2008
PubMed
Summary
This summary is machine-generated.

This study introduces a foveated video compression framework using nonuniform filtering to enhance video compressibility. The new method maximizes foveal signal-to-noise ratio (FSNR) for superior visual quality at reduced bit rates.

Related Experiment Videos

Last Updated: Jul 7, 2026

High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques
11:34

High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques

Published on: December 3, 2013

Area of Science:

  • Computer Vision
  • Digital Signal Processing
  • Video Compression

Background:

  • Human visual system exhibits nonuniform sampling, with higher acuity in the fovea.
  • Existing foveated video compression aims to leverage this nonuniformity for efficiency.
  • Nonuniform filtering can increase video stream compressibility.

Purpose of the Study:

  • To develop a foveated video compression framework using nonuniform filtering.
  • To maximize the foveal signal-to-noise ratio (FSNR) for optimal visual quality.
  • To establish new rate control algorithms for efficient video compression.

Main Methods:

  • Implemented a nonuniform filtering scheme for foveated video creation.
  • Developed an optimal rate control algorithm maximizing FSNR using Lagrange multipliers.
  • Introduced a piecewise rate-distortion/rate-quantization (R-D/R-Q) model.
  • Presented a fast algorithm for optimal Lagrange multiplier search.
  • Developed a suboptimal rate control algorithm for H.263/MPEG video coding.

Main Results:

  • Demonstrated improved reconstructed video quality with maximized FSNR.
  • Showcased coding performance for H.263+/MPEG-4 video coding.
  • Foveated video coding with the suboptimal algorithm achieved excellent performance below 64 kb/s.
  • Compared reconstructed pictures from optimal rate control for foveated and normal video.

Conclusions:

  • The proposed foveated video compression framework effectively enhances compressibility.
  • The novel FSNR metric and rate control algorithms optimize visual quality for target bit rates.
  • The suboptimal rate control algorithm offers high performance for real-time applications.