| 摘要 |
In a method and apparatus for performing an MTF test on endoscopes, a beam of light is filtered through a sinusoidally-varying medium defining a transmittance which is approximately uniform along a first direction within the medium, and which varies sinusoidally along a second direction within the medium thereby generating a beam defining an intensity which varies sinusoidally in a predetermined direction. The filtered beam is transmitted through an endoscope from a first end through a second end of the endoscope, and a video system generates signals indicative of the optical intensity of the transmitted beam at each of a plurality of predetermined locations within the beam. Noise is filtered from the intensity signals, and the filtered intensity signals are in turn used in determining the MTF at each of a plurality of predetermined locations within the beam, thereby providing an indication of the optical performance characteristics of the endoscope.
|
