"Since imaging systems are often classified in terms of resolution and contrast, our photographic paper targets allow users to evaluate their systems using the standard USAF format for resolution measurements at different contrast levels... By imaging targets of various contrast, the user can make qualitative comparisons between lenses as well as evaluate the performance of the system for objects with varying or low contrast levels."
The 1951 USAF Contrast Resolution Target, comprised of 15 patterns identical to the picture above at different levels of contrast, will be used to calibrate the optics lab in regards to contrast and spatial frequency.
more...
The original system is composed (R-to-L in the picture to the left) of a Canon EOS D30 Digital SLR camera, a Leica Z6 APO long-distance microscope zoom lens, an iris diaphragm to control the field of view, and an in-line integrating sphere with a 3-watt lamp as a uniform light source - all horizontally mounted on a vibration-free optics table.
No comments:
Post a Comment