Accession Number : AD0753947

Title :   The Use of Edges of Photographic Images as Specifiers of Image Quality.

Descriptive Note : Final rept. 1 Nov 70-15 Oct 72,

Corporate Author : OHIO STATE UNIV COLUMBUS DEPT OF GEODETIC SCIENCE

Personal Author(s) : Thompson,Leon G.

Report Date : NOV 1972

Pagination or Media Count : 174

Abstract : The primary objective of this study was to search for some measureable quantity which would specify the quality of an image with reference to a photogrammetrist's ability to measure to an edge. The image quality criterion was the closeness together of the edge determinations of four experienced observers who were asked to set a measuring mark tangent to a series of edges generated by rapidly rotating various patterns. An edge of high measuring quality was defined as any edge which rendered a high degree of agreement in edge determination and was measured by computing the standard deviation in edge location of the four observers. The second objective of studying where an observer determines the edge to be located was easily studied as a result of the many edge determinations required in ranking the edges as to image quality. A new term called decutance was derived which correlates very highly with the measured image quality. (Author)

Descriptors :   (*PHOTOGRAPHIC IMAGES, PHOTOGRAPHIC ANALYSIS), (*PHOTOGRAMMETRY, PHOTOGRAPHIC IMAGES), TRANSFER FUNCTIONS, FOURIER ANALYSIS, PHOTOINTERPRETABILITY, TEST METHODS, THESES

Subject Categories : Cartography and Aerial Photography
      Photography

Distribution Statement : APPROVED FOR PUBLIC RELEASE