Image Transmission via Spread Spectrum Techniques

Abstract

The paper addresses the design of a spread spectrum image transmission system to provide increased antijam protection to a television link from a small remotely piloted vehicle. Transform encoding and frame rate control may be used to remove the natural redundancy inherent in the image in order to permit the use of spread spectrum encoding for increased antijam protection. Emphasis is placed on the two-dimensional discrete cosine transform (DCT) and a hybrid DCT with differential pulse code modulation (DPCM). Both the two-dimensional DCT and the hybrid DCT/DPCM provide nearly the theoretically optimal performance of the Karhunen-Loeve transform, while permitting implementation by small, lightweight hardware in real-time.

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Document Details

Document Type
Technical Report
Publication Date
Jun 30, 1974
Accession Number
AD0780805

Entities

People

  • Harper J. Whitehouse
  • Jeffrey M. Speiser
  • Robert W. Means

Tags

Communities of Interest

  • Advanced Electronics
  • Sensors

DTIC Thesaurus Topics

  • Acoustic Waves
  • Algorithms
  • Charge Coupled Devices
  • Coding
  • Converters
  • Differential Pulse Code Modulation
  • Frequency
  • Image Processing
  • Modulation
  • Optical Correlators
  • Pulse Code Modulation
  • Remotely Piloted Vehicles
  • Signal Processing
  • Spread Spectrum
  • Surface Acoustic Wave Devices
  • Surface Acoustic Waves
  • Two Dimensional

Fields of Study

  • Engineering

Readers

  • Image Processing and Computer Vision.
  • Radio communications and signal processing.