Patent ID: 11906648
Assignee: HERE GLOBAL B.V.
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 14:
15. An apparatus comprising at least one processor and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to:
for each of a plurality of radio image matrices, apply a frequency transform to obtain transform coefficients from a set of radio data comprising the plurality of radio image matrices corresponding to different transmitters, each transform coefficient comprising a transform index and an associated transform value;
for each of the plurality of radio image matrices and based upon energy of frequency transformed radio data as represented by the transform coefficients, select a subset of transform indices; and
for each of the plurality of radio image matrices, compress the subset of transform indices by encoding the transform indices exploiting a probability of occurrence of an index value of a respective transform index,
wherein the apparatus is caused to select at least the minimum number of transform indices by excluding the transform coefficient corresponding to a direct current (DC) component.