IDENTIFICATION OF OBLIQUE FORMS.
Abstract
Accuracy of form recognition was determined for 45 observers who viewed photographic slide projections of nine military-type targets (3 each of ships, airplanes, ground vehicles). The veiws represented in the imagery included five oblique viewing angles and five orientations (compass directions). They were displayed at three levels each of exposure time, image quality (blur), contrast, and scale ratio. Tests of the statistical significance of the differences in performance as a function of changes in oblique angle of view, orientation of target (with respect to compass direction), image quality, luminance contrast, and exposure time revealed that each main effect was significant (p < .05) for at least eight of the nine target-class/scale-ratio combinations. One interaction, obliquity x orientation, was significant (p < .01) for all nine combinations. Only 10 of the remaining 81 interactions were significant. Views from corresponding positions on opposite sides of the long axis of a target tended to yield equivalent performance scores. A second study revealed a similar tendency for views balanced about the short axis. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1964
- Accession Number
- AD0607357
Entities
People
- C. L. Elworth
- C. L. Klingberg
- C. L. Kraft
Organizations
- Boeing