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 (R
1v+Q
1) {u (v) -u (v-v
1) } + (R
2v+Q
2) {u (v-v
1) -u (v-v
2) } + (R
1v+Q
3) {u (v-v
2) -u (v-v
3) } +B
1u (v-v
3), where v is the moving velocity (m s
-1), u (v) is a unit step function of v, B
1is the highest brightness (cd m
-2), R
1, Q
1, R
2, Q
2, Q
3and v
1<v
2<v
3are 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.
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