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When we look at the capacity of the human visual system we see that man can adjust to a wide variety of operating conditions. But, unless we have detailed information of the conditions for which these processes are to be standardized and quantitative descriptions of the tasks to be performed, the advantages to be obtained by visual science applications cannot be utilized optimally. The modulation transfer function would be an image evaluation technique applicable to nondestructive testing (NDT). Standardized tests to assess day-to-day performance as well as initial capacities should be developed. These tests should be derived from visual capacities correlated with the tasks to be performed.
nondestructive tests, standards, visual inspection
Research psychologist, Center for Building Technology, National Bureau of Standards, Washington, D. C.