These parameters correspond to the parameters assigned to the
libopencv function @code{cvSmooth}.
+@section oscilloscope
+
+2D Video Oscilloscope.
+
+Useful to measure spatial impulse, step responses, chroma delays, etc.
+
+It accepts the following parameters:
+
+@table @option
+@item x
+Set scope center x position.
+
+@item y
+Set scope center y position.
+
+@item s
+Set scope size, relative to frame diagonal.
+
+@item t
+Set scope tilt/rotation.
+
+@item o
+Set trace opacity.
+
+@item tx
+Set trace center x position.
+
+@item ty
+Set trace center y position.
+
+@item tw
+Set trace width, relative to width of frame.
+
+@item th
+Set trace height, relative to height of frame.
+
+@item c
+Set which components to trace. By default it traces first three components.
+
+@item g
+Draw trace grid. By default is enabled.
+
+@item st
+Draw some statistics. By default is enabled.
+
+@item sc
+Draw scope. By default is enabled.
+@end table
+
+@subsection Examples
+
+@itemize
+@item
+Inspect full first row of video frame.
+@example
+oscilloscope=x=0.5:y=0:s=1
+@end example
+
+@item
+Inspect full last row of video frame.
+@example
+oscilloscope=x=0.5:y=1:s=1
+@end example
+
+@item
+Inspect full 5th line of video frame of height 1080.
+@example
+oscilloscope=x=0.5:y=5/1080:s=1
+@end example
+
+@item
+Inspect full last column of video frame.
+@example
+oscilloscope=x=1:y=0.5:s=1:t=1
+@end example
+
+@end itemize
+
@anchor{overlay}
@section overlay
can be used to test the monowhite pixel format descriptor definition.
+@section pixscope
+
+Display sample values of color channels. Mainly useful for checking color and levels.
+
+The filters accept the following options:
+
+@table @option
+@item x
+Set scope X position, offset on X axis.
+
+@item y
+Set scope Y position, offset on Y axis.
+
+@item w
+Set scope width.
+
+@item h
+Set scope height.
+
+@item o
+Set window opacity. This window also holds statistics about pixel area.
+@end table
+
@section pp
Enable the specified chain of postprocessing subfilters using libpostproc. This