Hexagonal Image Processing: A Practical Approach

This book provides an introduction to the processing of hexagonally sampled images, includes a survey of the work done in the field, and presents a novel framework for hexagonal image processing (HIP) based on hierarchical aggregates.
The strengths offered by hexagonal lattices over square lattices to define digital images are considerable:
higher packing density
uniform connectivity of points (pixels) in the lattice
better angular resolution by virtue of having more nearest neighbours
superlative representation of curves