Abstract: A method comprising performing object detection within a set of representations of a hierarchically-structured signal, the set of representations comprising at least a first representation of the signal at a first level of quality and a second representation of the signal at a second, higher level of quality.

Abstract: There is provided a system that, when in operation, classifies one or more elements within an input signal, wherein the system: receives a compressed version of the input signal, wherein the compressed version comprises at least two sets of compressed data in a hierarchy, wherein each set of compressed data, when decoded, enables the signal to be reconstructed up to a respective level of quality; decodes the compressed version of the signal up to a first level of quality by decoding a first set of compressed data to generate a first reconstructed signal; performs a first classification operation on the first reconstructed signal; decodes the compressed version of the signal up to a second level of quality by decoding a second set of compressed data to generate a second reconstructed signal; and performs one or more second classification operations on the second reconstructed signal.

Abstract: A method comprising performing object detection within a set of representations of a hierarchically-structured signal, the set of representations comprising at least a first representation of the signal at a first level of quality and a second representation of the signal at a second, higher level of quality.