Accession Number:

AD0723662

Title:

Walsh-Hadamard Transformations in Image Processing,

Descriptive Note:

Corporate Author:

CALIFORNIA UNIV LOS ANGELES SCHOOL OF ENGINEERING AND APPLIED SCIENCE

Personal Author(s):

Report Date:

1971-03-01

Pagination or Media Count:

133.0

Abstract:

A technique is presented for obtaining the Walsh-Hadamard W-H transform of a picture in real-time by operating separately on each picture line. Overlap of scanning and computations, results in savings of the total time required to transform a picture. For digital computer processing core storage requirements are reduced. The technique leads to the hardware implementation of a machine capable of performing real-time parallel W-H transformation. The axis-symmetry parameter of the Walsh functions is defined and the axis-symmetry number and the period of a Walsh function are derived from its sequency number. Analysis of Walsh spectra establishes the relations between image samples and Walsh spectrum coefficients. Walsh functions are used in designing a feature extractor. The axis-symmetry histogram is obtained from the Walsh spectrum of a pattern by adding the squares of the spectrum coefficients that correspond to a given axis-symmetry number tau and plotting these against tau. Axis-symmetry histograms result in great dimensionality in the feature space. Author

Subject Categories:

  • Cybernetics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE