Various example embodiments are directed to apparatuses and methods including an apparatus having sensor circuitry and processing circuitry. In one example, sensor circuitry produces and senses detected signals corresponding to physical objects located in an operational region relative to a location of the sensor circuitry. The processing circuitry records and organizes information associated with the detected signals in a plurality of sub-histograms respectively associated with different accuracy metrics for corresponding sub-regions of the operational region, each of the plurality of sub-histograms including a set of histogram bins characterized by a bin width linked to its accuracy metric, and refines at least one of the accuracy metric by adapting one or more of the bin widths dynamically in response to the detected signals.