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Unformatted text preview: arrangement of two mirrors and monitor
for this experiment. A video camera is pointed at the monitor and mirrors, and
the signal from the camera fed into the monitor. With appropriate adjustment
of camera zoom, stable fractal images can be produced. An example is seen on
the right side of Fig. 2.49.
In the middle of Fig. 2.49 we show how to unpack the basic structure of
the two mirror videofeedback, and ﬁnd the main aspects of the equivalent IFS.
The image of the monitor in the left mirror is obtained by reﬂecting across the
y -axis; the image of the monitor in the bottom mirror is obtained by reﬂecting
across the x-axis. Both mirrors include reﬂections of a portion of the image in
the other mirror. Both compositions of reﬂections across the x- and y -axes are
equivalent to rotation about the origin by π . These ideas will guide our selection
of target and image points. image
across y rotate reflect
across x rotate Figure 2.49: Left: four images from a monitor and two mirrors. Middle: IFS
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