Comparison of Zoom Magnification vs Discrete Magnification for Target Scanning Tasks

摘要

The report describes the test and evaluation of zoom magnification versus discrete magnification for target scanning tasks on a rear projection viewer surface. The magnification range tested was 3X to 75X. The discrete selections were 3X, 6X, 12X, 18X, 30X, 50X, and 75X. The results are discussed for significant differences between magnification modes for plotted and unplotted targets in terms of time, accuracy, and completeness measures. Frequency of magnification change is significant for plotted targets. Also, some significant differences have been noted between scales for plotted and unplotted targets. (Author)