5 papers
Multi-layered model-based characterisation of the local-Universe galaxy data from the GAMA survey
Fan Dai, Ranjan Maitra, Ivan K. Baldry
Understanding the formation and evolution of galaxy populations requires robust classification and characterisation techniques that jointly account for internal galaxy properties a…
Boxplots and quartile plots for grouped and periodic angular data
Joshua D. Berlinski, Fan Dai, Ranjan Maitra
Angular observations, or observations lying on the unit circle, arise in many disciplines and require special care in their description, analysis, interpretation and visualization.…
Optimized -means color quantization of digital images in machine-based and human perception-based colorspaces
Ranjan Maitra
Color quantization represents an image using a fraction of its original number of colors while only minimally losing its visual quality. The -means algorithm is commonly used in…
The envelope of a complex Gaussian random variable
Sattwik Ghosal, Ranjan Maitra
The envelope of an elliptical Gaussian complex vector, or equivalently, the amplitude or norm of a bivariate normal random vector has application in many weather and signal process…
Latent characterisation of the complete BATSE gamma ray bursts catalogue using Gaussian mixture of factor analysers and model-estimated overlap-based syncytial clustering
Fan Dai, Ranjan Maitra
Characterising and distinguishing gamma-ray bursts (GRBs) has interested astronomers for many decades. While some authors have found two or three groups of GRBs by analyzing only a…