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Mask - tool designed to cover parts of the image which that should be ignored.
Unifier - unifies the position and rotation of the objects in the images for further processing.
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The order of modules is called Flow and the software runs through the flow with in a top to bottom direction.
By clicking in on Edit button, the flow can be configured, you can add modules by using + button on a desired position, which shows the following pop-up window, containing brief information about each module:
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