Accession Number : AD0666937

Title :   IMAGE DENSITY GRADIENT ANALYSIS.

Descriptive Note : Final rept. 12 Jan 67-12 Dec 67,

Corporate Author : PERKIN-ELMER CORP NORWALK CONN ELECTRO-OPTICAL DIV

Personal Author(s) : Kelly,John ; Yeadon,E. C.

Report Date : FEB 1968

Pagination or Media Count : 56

Abstract : The Image Density Gradient Analysis effort was concerned with (1) the determination of the accuracy and precision of the Perkin-Elmer Edge Gradient Analysis (EGA) technique, and (2) the modification of the EGA computer programs for use with the IBM 360 Model 30E computer. Two sets of special targets were prepared to check accuracy and precision. The first set contained edges with varying degrees of linear image motion and the second set contained an array of sinusoidal transmittance targets and a low contrast edge. The special targets were used to test the accuracy and precision of the EGA technique. The results showed that the technique was accurate and precise out to spatial frequencies of 200 cycles per millimeter. The linear motion targets were measured using the Mann Microanalyzer. The results showed that this instrument was accurate over the spatial frequency range of 0 to 100 cycles per millimeter. The EGA computer programs were modified and successfully tested on an IBM 360 Model 30E computer. (Author)

Descriptors :   (*PHOTOGRAPHIC INTELLIGENCE, *DATA PROCESSING), AERIAL RECONNAISSANCE, MODULATION, TRANSFER FUNCTIONS, ACCURACY, DENSITOMETERS, PHOTOGRAPHIC INTELLIGENCE, PHOTOINTERPRETATION, AERIAL PHOTOGRAPHY, PHOTOGRAPHIC IMAGES, AIR FORCE SYSTEMS COMMAND, PERFORMANCE(ENGINEERING), STATISTICAL ANALYSIS

Subject Categories : Cartography and Aerial Photography
      Military Intelligence

Distribution Statement : APPROVED FOR PUBLIC RELEASE