产品描述

This chart was designed by the FBI for gray level and resolution testing of the new Integrated Automated Fingerprint Identification System (IAFIS). The chart includes Ronchi areas with frequencies from 1 line pairs / mm to 19.6 line pairs / mm, and uniform gray areas having consistency better than ±0.02 O.D. Target size is 20 cm by 12.5 cm on photographic paper.