
K-factor,/C-rating
Kell effect
Kell factor, k
Key
L A, active lines
L T, total lines
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A numerical characterization of pulse fidelity, obtained by
measuring the tightest fit of a specific set of time-domain enve-
lope to a raised cosine test pulse. Distinguished from Kell factor, k
below.
In a video system -including sensor, signal processing, and
display-
Kell effect
refers to the loss of resolution, compared to
the Nyquist limit, caused by the spatial dispersion of light power.
Some dispersion is necessary to avoid aliasing upon capture, and
to avoid objectionable scan line (or pixel) structure ...