Line Criteria in Target Acquisition with Television

Abstract

This paper presents a review of experimental data from tests of target acquisition with electro-optical, raster scan systems. These data, as well as equipment parameters such as sensor field of view, system line number, display size, and target size on the display, can be used to estimate target acquisition performance by system operators. The paper lists the equations required to make such performance estimations, and several examples are given. The procedure can be used to compute equipment characteristics required to insure prescribed levels of target acquisition performance.

History and Evolution of the Johnson Criteria.

“…He estimated that his system had a ratio of 1.5 scan lines per resolution line, or 3 per line pair, and stated that using this conversion ratio, his results were comparable to Johnson's work in 1974. [29] In 1978, Lawson, Cassidy, and Ratches developed a time dependent model of search, in which the probability of detection could be characterized by the amount of time an observer had looking at the field, as well as a function of resolved cycles. This differed from the static approach, where observers had essentially unlimited time to detect and perform a discrimination task.…”

Target Identification Performance: The Effects of Display Resolution and Target Range

“…Much is known about resolution in terms of TV raster lines and target detection, recognition, and identification (e.g., Erickson, 1978;Goble, Williams, Pratt, Wald, Rubin, & Hanson, 1980;Meister, 1984).…”

Imaging Infrared Ship Target Acquisition Studies

“…When classification range and accuracy were used as indices of performance, the variables yielding statistically significant effects were ship type, ship orientation, and display contrast. Erickson (1978) has provided procedures which can be used to estimate equipment requirements needed to achieve various target acquisition performance levels for systems presenting television pictures to human operators. As Erickson pointed out, there are limitations to those procedures, which are principally due to individual system requirements and to boundaries on our understanding of many real-world visual-search processes, boundaries resulting from the relative isolation in which important independent variables are examined.…”