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The figures illustrate a dynamic thresholding circuit, both generally and with a specific embodiment.
English (United States)
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The figures illustrate a dynamic thresholding circuit, both generally and with
a specific embodiment.
Analog video signals 10 on inputs 11 are supplied to a comparator 12, a
positive peak follower 13, and a negative peak follower 14 (Figs. 1 and 2). The
positive peak follower tracks the background video level, which may be "white",
and the negative peak follower tracks the maximum video information peaks,
which may be "black" information. A ratio 15 of the two variable levels
establishes the dynamic threshold level for the other input of comparator 12 at
which a binary decision is made as to whether the instant input signal is video
data 16 or is background 17 (Fig. 3).
To prevent noise from making the binary decision when only background is
provided for an extended period, an adjusted variable level output 18 from the
positive peak follower is provided to clamp 19. This clamps the video level at a
predetermined level below the background noise to form a definite minimum ratio
for the comparator 12.
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