Accession Number : AD0656124

Title :   AN IMAGE RESTORATION EXPERIMENT ON TURBULENCE-DEGRADED IMAGES,

Corporate Author : SCRIPPS INSTITUTION OF OCEANOGRAPHY SAN DIEGO CALIF VISIBILITY LAB

Personal Author(s) : McGlamery,Benjamin L.

Report Date : JUL 1966

Pagination or Media Count : 20

Abstract : The report describes an experiment in which processing techniques were applied to turbulence-degraded images to improve their visual image quality. The initial objects were photographed through laboratory-generated turbulence. The resulting transparencies of the degraded images were digitized by a photoelectric scanner, recorded on punched cards, and processed on a digital computer. The processing consisted of applying corrections to the amplitude and phase coefficients of the two-dimensional Fourier series representing the degraded images. The correction factors were obtained from the point spread function of the turbulence measured at the time the images were photographed. The processed data was used to generate photographs of the restored images. The experiment was done for 5-millisecond and 1-minute exposure times. The restored images were found to have significantly more visual detail than the original degraded images, with the 5-millisecond exposure restorations being superior to the 1-minute exposure restorations. (Author)

Descriptors :   (*IMAGES, DEGRADATION), (*INFORMATION THEORY, MATHEMATICAL ANALYSIS), (*DATA PROCESSING, IMAGES), PHOTOGRAPHIC IMAGES, TURBULENCE, OPTICAL IMAGES, DIGITAL SYSTEMS, VISUAL ACUITY, PUNCHED CARDS, PATTERN RECOGNITION, PHOTOGRAPHIC CONTRAST

Subject Categories : Computer Hardware
      Cybernetics
      Printing and Graphic Arts
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE