| 摘要 |
<p>Apparatus for use in assessing T.V. inspection cameras (17) comprises a generally-cylindrical chart (11) presenting test markings (20-25) on its inner face. The test chart is mounted within a casing (10) having an end opening (19) for the camera (17) to be assessed, and having lamps (15) arranged around the cylindrical chart (11) for controlled illumination of the markings which, for assessment, are displayed on a VDU monitor. In one form, the chart (11) comprises a transparency carried in a light-diffuser (12, 13).</p> |
