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<H2><A ID="SECTION001210690000000000000000"></A><A ID="sub:rumbler"></A><A NAME="13332"></A>
<BR>
Rumbler
</H2>
<P>
<SMALL CLASS="SMALL">The <SPAN  CLASS="textit">Rumbler</SPAN> plugin can be used to create dream-like or earthquake-like noise in the video. It creates noise by jiggling the corners through use of perspective transformation at the corners. The algorithm used is:
</SMALL>
<P>
<P><!-- MATH
 \begin{displaymath}
Rumbler\,(value) = (value\, at\, time) + amplitude \times (random\, generator)
\end{displaymath}
 -->
</P>
<DIV ALIGN="CENTER" CLASS="mathdisplay">
<I>Rumbler</I>&nbsp;(<I>value</I>) = (<I>value</I>&nbsp;<I>at</I>&nbsp;<I>time</I>) + <I>amplitude</I>×(<I>random</I>&nbsp;<I>generator</I>)
</DIV><P></P>
<P>
<SMALL CLASS="SMALL">The random generator varies from <!-- MATH
 $-0.5\, to\, 0.5$
 -->
<SPAN CLASS="MATH">-0.5&nbsp;<I>to</I>&nbsp;0.5</SPAN>. The rumble perturbs the normal values at time points which occur rate times a second. The values used between the rumble points are interpolated, so that the value jiggles rate times a second, by as much as the rumble amplitude. The time unit is frames per second. The corners are in units of percent width/height (figure&nbsp;<A HREF="#fig:rumbler">10.62</A>).
</SMALL>
<P>

<DIV class="CENTER"><A ID="fig:rumbler"></A><A ID="13337"></A>
<TABLE>
<CAPTION class="BOTTOM"><STRONG>Figure 10.62:</STRONG>
Rumbler control window</CAPTION>
<TR><TD>
<DIV class="CENTER">    <IMG
  WIDTH="361" HEIGHT="184" STYLE=""
 SRC="./rumbler.png"
 ALT="Image rumbler">
    </DIV></TD></TR>
</TABLE>
</DIV>

<P>
<SMALL CLASS="SMALL">Screencast shows:
</SMALL>
<P>
<SMALL CLASS="SMALL"><SPAN  CLASS="textit">Time jittering</SPAN> - <SPAN CLASS="MATH">20&nbsp;<I>fps</I></SPAN> 1 time a second.
<SPAN  CLASS="textit">Corners jittering</SPAN> - <SPAN CLASS="MATH">25%</SPAN> <SPAN CLASS="MATH">5</SPAN> times a second.
Using <SPAN  CLASS="textit">random seed</SPAN> <SPAN CLASS="MATH">0</SPAN> for a rumble sequence.
</SMALL>
<P>
<SMALL CLASS="SMALL">Plugin variables:
</SMALL>
<P>
<DL>
<DT><STRONG>Rumbler:</STRONG></DT>
<DD>gain applied to random rumbler.
    
</DD>
<DT><STRONG>Rate:</STRONG></DT>
<DD>number of times per second.
    
</DD>
<DT><STRONG>Time:</STRONG></DT>
<DD>number of frames per rate times a second; if 0 has no effect on results.
    
</DD>
<DT><STRONG>Space:</STRONG></DT>
<DD>corners jiggling in percentage per rate times a second; if 0 has no effect on results.
    
</DD>
<DT><STRONG>Seq:</STRONG></DT>
<DD>is a random seed number; any reasonable positive or negative number you choose.
</DD>
</DL>
<P>

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