Brightness on CRT Display Affected by Fabric Movement or Cover Factor

Abstract

The brightness on CRT display affected by fabric movement or cover factor has been studied and the following results have been obtained.
(1) The mean brightness (cd m^-2) of moving picture of fabrics on CRT display due to afterglow is theoretically shown as (R₁v+Q₁) {u (v) -u (v-v₁) } + (R₂v+Q₂) {u (v-v₁) -u (v-v₂) } + (R₁v+Q₃) {u (v-v₂) -u (v-v₃) } +B₁u (v-v₃), where v is the moving velocity (m s^-1), u (v) is a unit step function of v, B₁is the highest brightness (cd m^-2), R₁, Q₁, R₂, Q₂, Q₃and v₁<v₂<v₃are constants (cd m^-3s, cd m^-2, cd m^-3s, cd m^-2, cd m^-2, m s^-1, respectively) .
(2) The mean brightness of stationary picture of solid color fabrics on CRT display is theoretically expressed as DC_f+E, due to unevenness of fabric surface, where C_fis the cover factor of fabrics, D and E are constants (cd m^-2, respectively) .
(3) The above mentioned results are in good agreement with the experimental results obtained by using a video camera, a CRT display and a illumination intensity meter.