User Manual

Match Weight
This controls how matching is done between neighboring pixels in the left image and
neighboring pixels in the right image. When a lower value is used, large structural color features
are matched. When higher values are used, small sharp variations in the color are matched.
Typically, a good value for this slider is in the [0.7, 0.9] range. Setting this option higher tends to
improve the matching results in the presence of differences due to smoothly varying shadows
or local lighting variations between the left and right images. You should still color match the
initial images so they are as similar as possible; this option tends to help with local variations
(e.g., lighting differences due to light passing through a mirror rig).
Mismatch Penalty
This controls how the penalty for mismatched regions grows as they become more dissimilar.
The slider provides a choice between a balance of Quadratic (lower values) and Linear (higher
values) penalties. Lower value Quadratic settings strongly penalize large dissimilarities, while
higher value Linear settings are more robust to dissimilar matches. Moving this slider toward
lower tends to give a disparity with more small random variations in it, while higher values
produce smoother, more visually pleasing results.
Warp Count
Turning down the Warp Count makes the disparity computations faster. In particular, the
computational time depends linearly upon this option. To understand what this option does, you
need to understand that the Disparity algorithm progressively warps the left image until it
matches with the right image. After some point, convergence is reached, and additional warps
are just a waste of computational time. The default value in Fusion is set high enough that
convergence should always be reached. You can tweak this value to speed up the
computations, but it is good to watch how the disparity is degrading in quality at the same time.
Iteration Count
Turning down the Iteration Count makes the disparity computations faster. In particular, the
computational time depends linearly upon this option. Just like adjusting Warp Count, at some
point adjusting this option higher will yield diminishing returns and will not produce significantly
better results. By default, this value is set to something that should converge for all possible
shots and can be tweaked lower fairly often without reducing the disparity’s quality.
Filtering
This menu determines the filtering operations used during flow generation. Catmull-Rom
filtering will produce better results, but at the same time, it increases the computation
time steeply.
Stack Mode
This menu determines how the input images are stacked.
When set to Separate, the Right Input and Output will appear, and separate left and right
images must be connected.
Swap Eyes
Enabling this checkbox causes the left and right images to swap.
Common Controls
Settings Tab
The Settings tab in the Inspector is also duplicated in other Stereo nodes. These common
controls are described in detail at the end of this chapter in “The Common Controls” section.
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