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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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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.
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Visually Lossless JPEG 2000 for Remote Image Browsing.

Han Oh1, Ali Bilgin2,3, Michael Marcellin3

  • 1National Satellite Operation and Application Center, Korea Aerospace Research Institute (KARI); 169-84 Gwahak-ro, Yuseong-gu, Daejeon, 34133, Republic of Korea.

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|July 28, 2017
PubMed
Summary
This summary is machine-generated.

This study introduces a method to optimize visually lossless image display across various resolutions for remote browsing. It reduces bandwidth requirements by incorporating multiple quantization step sizes into a single JPEG2000 codestream.

Keywords:
JPEG2000 Interactive Protocol (JPIP)contrast sensitivity functionvisually lossless coding

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Area of Science:

  • Digital image processing
  • Image compression
  • Computer vision

Background:

  • Image sizes are growing exponentially, necessitating efficient remote browsing.
  • Remote image viewing requires zooming and panning, leading to variable display resolutions.
  • Visually lossless display at reduced resolutions typically demands larger quantization step sizes.

Purpose of the Study:

  • To investigate quantization step sizes for visually lossless image display at different resolutions.
  • To propose a method for integrating multiple quantization step sizes into a single JPEG2000 codestream.
  • To enable efficient remote image browsing with reduced bandwidth.

Main Methods:

  • Analysis of quantization step sizes as a function of display resolution.
  • Development of a method to incorporate variable quantization step sizes into a JPEG2000 codestream.
  • Compliance with JPEG2000 Part 1 standard.

Main Results:

  • A single JPEG2000 codestream supports visually lossless decoding at multiple resolutions.
  • Visually lossless decoding is achievable at native and intermediate resolutions.
  • Significant bandwidth reduction demonstrated when using the JPEG2000 Interactive Protocol (JPIP).

Conclusions:

  • The proposed method effectively manages quantization for visually lossless image display across resolutions.
  • The JPEG2000 codestream facilitates efficient remote image browsing.
  • Reduced bandwidth consumption is a key benefit for remote image access.