1 citations · 1 across the 5 of their papers we have counts for
5 papers
Similarity Equivariant Linear Transformation of Joint Orientation-Scale Space Representations
Xinhua Zhang, Lance R. Williams
Convolution is conventionally defined as a linear operation on functions of one or more variables which commutes with shifts. Group convolution generalizes the concept to linear op…
Euclidean Invariant Recognition of 2D Shapes Using Histograms of Magnitudes of Local Fourier-Mellin Descriptors
Xinhua Zhang, Lance R. Williams
Because the magnitude of inner products with its basis functions are invariant to rotation and scale change, the Fourier-Mellin transform has long been used as a component in Eucli…
Increased Complexity and Fitness of Artificial Cells that Reproduce Using Spatially Distributed Asynchronous Parallel Processes
Lance R. Williams
Replication time is among the most important components of a bacterial cell's reproductive fitness. Paradoxically, larger cells replicate in less time than smaller cells despite th…
Towards Complex Artificial Life
Lance R. Williams
An object-oriented combinator chemistry was used to construct an artificial organism with a system architecture possessing characteristics necessary for organisms to evolve into mo…
Programs as Polypeptides
Lance R. Williams
We describe a visual programming language for defining behaviors manifested by reified actors in a 2D virtual world that can be compiled into programs comprised of sequences of com…