Average is similar to Image, but with
a very substantial difference. The slices of a database it displays are
created by averaging together all the data between the front (or back)
of the database and the current slider level. As a result, most that can
be done with Image can also be done with Average; only the exceptions will
be covered here.
In particular, however, Average's Drag & Drop button is more useful
than Image's; the database created by Average is quite different than the
original.
Controls
Buttons
Magnify, minify and histogram take the same form as they do in Image.
Menus
The Crosshair, Bounding Box, Profile line,
Grid and Smooth Magnify options are the same as they are in Image.
The menu also contains a choice called Averaging Direction which consists
of "Front to Slider" and "Back to Slider." This entry chooses which part
of the database is used to compute the displayed slice. The default is
"Front to Slider," and since the front slice is the default slider position,
Average initially appears with the same image as Image. Each case includes
the level of the slider.
Applications to Connect to This Application
Any Data Object may be connected via the
"drag 'n drop" button to this application. If Image,
or Combine is linked into Average, their crosshairs
or bounding boxes will control Average's. The Color
Tool will change the palette used in Average without changing the database's
palette. Histogram can be linked in to limit
the palette used in Average. RGBSlider will
control Average in RGB mode; Slider will control
Average in normal mode. Each will control which slice of the database Average
is to display. Scat2D's bounding box will display
an overlay on Average showing where data samples in Scat2D are found.
Applications to Connect This Application to
Average can control Combine and Image
by being linked in and using its crosshair or bounding box. The crosshair
and bounding box in the application to which Average is linked will follow
Average's in this case.
LinePlot will follow Average's crosshair
if Image is linked into it; this is the most common way to use LinePlot.
TrackPixel will use Average's crosshair and
bounding box to produce statistical information about the database if Average
is linked into it; this is the most common way to use TrackPixel.
ValueView will indicate which values are
within Average's bounding box if Average is linked into it.
Tricks and Gotchas
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/ Oct 5, 2001
