Importance

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Abstract

Input image data define an input image set that shows a node-link structure, such as a directed graph, an undirected graph, a tree, a flow chart, a circuit diagram, or a state-transition diagram. The input image set can include one image showing the node-link structure or two images, one showing graphical features that are a subset of the nodes and the other an image of an overlay with editing marks that include the links and another subset of the nodes. The input image data are used to obtain likely node-link data indicating parts of the input image set that satisfy a constraint on nodes and parts that satisfy a constraint on links. The likely node-link data are used to obtain constrained node-link data indicating subsets of the likely nodes and links that satisfy a constraint on node-link structures. The likely node-link data can include data defining a likely node image showing parts that meet a node criterion and data defining a likely link image showing parts that meet a link criterion. The constrained node-link data can be obtained by iteratively applying a link nearness criterion to the likely nodes and a node nearness criterion to the likely links until stability is reached. The constrained node-link data can be used to obtain output image data defining an output image that includes a precisely formed version of the node-link structure or an edited version of an input image. Or the constrained node-link data can be used to provide control signals to a system.

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