Comparative Analysis of Gray Scale Coding Techniques for Group 4 Facsimile

Abstract

This compares bit-plane coding (BPC), differential pulse code modulation (DPCM), transform coding, and predictive vector quantization (PVQ) to determine their relative effectiveness for the addition of gray scale to Group 4 facsimile. At present, the CCITT Recommendation for Group 4 facsimile permit the transmission of only black and white imagery (black print on white paper; not photographic). Consequently, most gray scale imagery (like photographs) are usually distorted by Group 4 equipments. To correct this, the CCITT is planning at add gray scale to the Group 4 Recommendations as an option. The aforementioned coding techniques have already been studied individually, but they haven't been compared to one another, nor have they been ranked according to their suitability for Group 4 facsimile.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1991
Accession Number
ADA243175

Entities

Organizations

  • Delta Information Systems (United States)

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Coders
  • Coding
  • Communication Systems
  • Data Compression
  • Decoding
  • Differential Pulse Code Modulation
  • Gray Scale
  • High Resolution
  • Image Compression
  • Modulation
  • Pulse Code Modulation
  • Quantum Numbers
  • Spatial Filtering
  • Standards
  • Statistics
  • Test And Evaluation
  • Two Dimensional

Fields of Study

  • Psychology

Readers

  • Computer Programming and Software Development.
  • Image Processing and Computer Vision.
  • Psychometric Testing or Psychological Assessment.