We introduce the idea of using a perception-based medial point description of a biological form (such as a 2D profile of a moving animal) as a basis for movement computing which delivers computational schemes to automatically annotate movement and be capable of producing meaningful qualitative descriptions. We distinguish interior from exterior shape representation. Interior medialness is used to characterise deformations from straightness, corners and necks, while exterior medialness identifies the main concavities and inlands which are useful to verify parts extent and reason about articulation and movement. We define an interior dominant point as a well localised peak value in medialness representation, while an exterior dominant point is evaluated by identifying a region of concavity sub-tended by a minimum angular support. Furthermore, significant convex points are extracted from the object's form to further characterise the elongation of parts. We propose that our evaluated feature points are sufficiently representative, as a basis for shape characterisation, to address many of the goals of movement computing.
Dynamics, movement, kinetics, animation: So many names for an area so frequently ignored in graphics. Ephemeral by nature, such transient devices are frequently ignored over the concrete and contextual. Yet the screen has become the primary source for accessing information and is ubiquitous in urban advertising, stimulating graphics increasingly to include dynamics and visual momentum in their design. This paper seeks to reappraise the application of dynamics for representation and appeal, drawing on implied dynamics in static images, dynamics within the frame and dynamic editing.Using illustrative examples this paper discusses whether a commonality of kinetic perception in dynamics can be relied upon for engagement and appeal, and offers a new conceptual model for event perception, drawing on cognitive psychology, montage theory and eye tracking technology.The paper posits that motion is a primary perceptual form and that its application in visualization boosts gestalt comprehension.
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