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Setting Spatial Interpolation
The next step is to interpolate the missing vertical scanlines in areas of motion.
You can select from four levels of quality with the default setting of Cubic
being the best. Cubic is based on information calculated from four scanlines.
Linear means to take the average of lines from two fields, whereas Nearest
means to just copy the line from above or below. Selecting the Black parameter
will display which pixels are being interpolated. This is useful when setting
the Motion Threshold.
The Edge Preserve value field lets you set the amount of edge antialiasing you
want to apply, while the Angles parameter is a performance/quality trade-off
setting which effectively controls the amount of searching for appropriate
edge direction. Increasing the number of angles sets the number of steps from
0 to 90 degrees, or the direction of the antialiasing.
Setting Temporal Interpolation
To create an output frame from a given input field, we copy the field, consisting
of every second line of input, to the output frame. The remaining lines in the
output must be interpolated somehow. Temporal interpolation is what is used
in areas of the scene that are considered to be static (non-moving), as
controlled by the Motion Threshold. The choices of temporal interpolation
are Nearest or Linear. Nearest means to just copy the lines from the other field
in the same input frame, whereas linear means to take the average of lines
from two fields: the other field in the same input frame and the field either
2 fields before or 2 fields after that.
When should one use Linear and when should one use Nearest? The short
answer is to always use Linear unless you need to preserve grain in static areas,
800 | Chapter 33 Video Tools