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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...
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Introduction to Scalers

Many familiar physical quantities can be specified completely by giving a single number and the appropriate unit. For example, "a class period lasts 50 min," or "the gas tank in my car holds 65 L," or "the distance between the two posts is 100 m." A physical quantity that can be specified completely in this manner is called a scalar quantity. The word "scalar" is a synonym for "number." Time, mass, distance, length, volume, temperature, and energy are some examples of scalar quantities.
Scalar...
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Super-resolution Fluorescence Microscopy

Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been developed.
Downsampling01:20

Downsampling

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NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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Imaging Biological Samples with Optical Microscopy

Optical microscopy uses optic principles to provide detailed images of samples. Antonie van Leeuwenhoek designed the first compound optical microscope in the 17th century to visualize blood cells, bacteria, and yeast cells. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes with enhanced magnification and resolution.
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A New Workflow for Sampling and Digitizing Increment Cores
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Improved resolution scalability for bilevel image data in JPEG2000.

Rahul Raguram1, Michael W Marcellin, Ali Bilgin

  • 1Department of Electrical and Computer Engineering, University of Arizona, Tucson, AZ 85721, USA. rraguram@ece.arizona.edu

IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society
|February 21, 2009
PubMed
Summary
This summary is machine-generated.

JPEG2000 compression for bilevel images has quality issues at low resolutions. This paper introduces two methods to enhance resolution scalability and interactive access for bilevel imagery, improving JPEG2000 performance.

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Area of Science:

  • Digital image processing
  • Data compression standards

Background:

  • JPEG2000 is a unified framework for bilevel and continuous-tone image compression.
  • Significant limitations exist in JPEG2000's lossless compression of bilevel imagery.
  • Low-resolution image quality degradation hinders JPEG2000's resolution scalability for bilevel images.

Purpose of the Study:

  • To examine the effects of JPEG2000 on bilevel image compression quality.
  • To present efficient methods for improving resolution scalability in bilevel JPEG2000 compression.
  • To enable efficient interactive access of compressed bilevel imagery.

Main Methods:

  • Analysis of rounding operations in the JPEG2000 lossless compression pathway.
  • Introduction of a pixel assignment scheme to enhance image quality.
  • Development of a strategy using the JPIP protocol for interactive access.

Main Results:

  • A pixel assignment scheme improves image quality for common bilevel imagery types.
  • A JPIP-based strategy enables efficient interactive access of compressed bilevel data.
  • Both methods are fully compliant with Part 1 of the JPEG2000 standard.

Conclusions:

  • JPEG2000 compression can be improved for bilevel imagery, particularly regarding resolution scalability.
  • The proposed methods offer practical solutions for enhancing bilevel image compression and access.
  • Enhanced JPEG2000 compression ensures better performance for bilevel image applications.