1. A method comprising: receiving multi-dimensional image data indicative of an image of an object; determining multi-dimensional spectrum data by transforming the multi-dimensional image data into Fourier domain; partitioning the multi-dimensional spectrum data into a plurality of partitions, wherein each partition is associated with a predetermined set of orthogonal voice frequencies; determining discrete orthonormal Stockwell transform data by transforming the partitioned multi-dimensional spectrum data into Stockwell domain; determining data associated with image texture in dependence upon the discrete orthonormal Stockwell transform data, the data associated with image texture being indicative of a feature of the object; and, providing the data associated with image texture.