In this work we present a new 4D approach for reducing noise in gated SPECT perfusion images while preserving accurate cardiac motion. The method is based on motioncompensated temporal smoothing using a deformable content-adaptive mesh to model cardiac motion. We use a new, fast method for initial mesh generation. This mesh is then deformed to track cardiac motion and smoothing is performed alo...

This paper presents an algorithm-based low-power VLSI architecture for video object (VO) motion tracking. The new architecture uses a novel hierarchical adaptive structured mesh topology. The structured mesh offers a significant reduction in the number of bits that describe the mesh topology. The motion of the mesh nodes represents the deformation of the VO. The motion compensation is performed...

This paper first provides an overview of two-dimensional (2-D) and three-dimensional mesh models for digital video processing. It then introduces 2-D mesh-based modeling of video objects as a compact representation of motion and shape for interactive, synthetic/natural video manipulation, compression, and indexing. The 2-D mesh representation and the mesh geometry and motion compression have re...

A video coder is presented that combines mesh-based motion-compensated temporal filtering, phase-diversity multihypothesis motion compensation, and an embedded 3D wavelet-coefficient coder. The key contribution of this work is the introduction of the phasediversity multihypothesis paradigm into motion-compensated temporal filtering, which is achieved by deploying temporal filtering in the domai...

In this paper, we present a novel mesh structure for representing the motion in the occlusion areas for video analysis and video coding purposes. We use the notion of crackline which represents a rupture in a motion field and create a non−manifold mesh that allows to estimate the motion in the occlusion areas without degeneration of the triangles. The non−manifold mesh can represent the discont...

The motion planning problem for an object with two degrees of freedom moving in the plane can be stated as follows: Given a set of polygonal obstacles in the plane, and a two-dimensional mobile object B with two degrees of freedom, determine if it is possible to move B from a start position to a final position while avoiding the obstacles. If so, plan a path for such a motion. Techniques from c...

A new mesh generation algorithm is proposed for mesh-based video coding. The still segmentation result of watershed segmentation is projected onto motion segmentation result of change region detection in proposed algorithm. Therefore, mesh presentation generated by our new method is able to reflect both spatial and temporal features of input video sequence. This experimental results show that m...

The motion planning problem for an object with two degrees of freedom moving in the plane can be stated as follows: Given a set of polygonal obstacles in the plane, and a two-dimensional mobile object B with two degrees of freedom, determine if it is possible to move B from a start position to a nal position while avoiding the obstacles. If so, plan a path for such a motion. Techniques from com...