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Important picture area
Lets you specify where in an image movement should be detected. Or at least it lets you shift the
focus from the edge of an image to its centre.
Imagine a beam of light illuminating an entire image area. This would correspond to the setting
"neutral".
Now imagine a spotlight illuminating only the centre of the image area.
This would correspond to the setting "centre".
Any movement in the area that is not illuminated would be ignored.
With the setting "border", on the other hand, only the border area would be illuminated. Any
movement in the centre of the image would be ignored. Are you wondering what this is for?
You might think that movement detection should always include all available information to
achieve the best possible result. That is how many other stabilisation solutions work. Mercalli
offers a small but significant difference.
Imagine that the filmed object you want the viewer to focus on is a duck, swimming in the centre
of the screen. This duck would therefore be the object that needs to be stabilised. However, the
waves around the duck also create movement, which would interfere with the stabilisation of the
duck. If movement analysis focuses on the duck (and therefore ignores the waves), the
stabilisation result will simply be much better!
Special video analysis
Detect shapeless contents
Mercalli generally tries to include the high-contrast contents of an image in the movement
analysis. But what if there is no high-contrast content?
In such a case, you could include, for instance, clouds in the analysis, which would serve as fixed
points for detection of movement. To do that, select this checkbox.
Detect fast motions
In action-filled video sequences, certain fast movements during filming may be unavoidable.
Such movements are not generally included in the analysis.
Depending on the effect you are aiming for, you may wish to select this checkbox to compensate
fast movements.
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