Accession Number : AD0012018


Title :   DETERMINATION OF WIDTH AND LUMINANCE OF CATHODE-RAY-TUBE TRACE


Corporate Author : COLUMBIA UNIV NEW YORK


Personal Author(s) : RANKEN, HOWARD B


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/012018.pdf


Report Date : Sep 1952


Pagination or Media Count : 15


Abstract : A method is described for specifying CRT traces in terms of visual measures of width and central luminance. Trace width is measured with an image doubler which produces 2 parallel images of the CRT trace; width is defined in terms of the distance between the centers of the 2 images when they just appear to merge. Central luminance of the trace is measured with a magnifying system in conjunction with a Macbeth illuminometer. The magnifier produces a real image of the trace sufficiently enlarged to fill the field of the Macbeth. Matching is performed in the usual way; the appropriate conversion factor is applied to the Macbeth reading. Estimates of intra-observer and inter-observer variability are given for width and luminance measures. The method of measuring central luminance is compared experimentally with an alternative method involving a direct monocular match.


Descriptors :   *PIXELS , *CATHODE RAY TUBE SCREENS , CONVERSION , MEASUREMENT , RANGE(DISTANCE) , MAGNIFICATION , CATHODE RAY TUBES , LUMINANCE


Subject Categories : Recording and Playback Devices


Distribution Statement : APPROVED FOR PUBLIC RELEASE