Sony DVS-9000 User Manual page 80

Aspect
In the source coordinate space, changes the aspect ratio in the x-direction and
y-direction, either independently or simultaneously.
Change of aspect ratio in
x-direction
Perspective
In the target coordinate space, changes the perspective on the image by
changing an imaginary view point, without changing the position of the image.
The x-axis and y-axis values define the position of the view point. The z-axis
value defines its distance from the image.
Change of view point on
x-axis
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Digital Multi Effects (DME)
Change of aspect ratio in y-
direction
Change of view point on y-
axis
Simultaneous change
aspect ratio in x-direction
and y-direction
Change of distance from
view point to image