Evaluation device for re-identification and corresponding method, system and computer program
Examples relate to an evaluation device for re-identification and to a corresponding method, system and computer program. The evaluation device comprises processing circuitry being configured to obtain a plurality of transformed re-identification codes, each transformed re-identification code being associated with a timestamp and location information. Each transformed re-identification code is based on a similarity-preserving transformation of a re-identification code that represents at least a portion of a sample of media data, the media data originating from two or more different sources located in two or more different locations. The processing circuitry is configured to match transformed re-identification codes among the plurality of transformed re-identification codes using a similarity metric to generate one or more tuples of transformed re-identification codes that are similar according to the similarity metric. The processing circuitry is configured to determine one or more sequences of locations associated with the transformed re-identification codes of the one or more tuples of transformed re-identification codes based on the timestamps and location information associated with the transformed re-identification codes of the respective tuple. The processing circuitry is configured to provide information on the one or more sequences of locations.
1 . A system for re-identification comprising,
a plurality of camera devices, and
an evaluation device;
each camera device of the plurality of camera devices comprising an imaging sensor and processing circuitry configured to:
obtain media data via the imaging sensor;
generate a re-identification code representing at least a portion of the media data;
transform the re-identification code using a similarity-preserving transformation based on a transformation parameter that is dependent upon time, to obtain a transformed re-identification code;
associate the transformed re-identification code with a timestamp and location information; and
provide the transformed re-identification code, the timestamp, and the location information to the evaluation device, and
the evaluation device comprising processing circuitry being configured to:
obtain a plurality of transformed re-identification codes from the plurality of camera devices,
match transformed re-identification codes among the plurality of transformed re-identification codes using a similarity metric to generate one or more tuples of transformed re-identification codes that are similar according to the similarity metric;
determine one or more sequences of locations associated with the transformed re-identification codes of the one or more tuples of transformed re-identification codes based on the timestamps and location information associated with the transformed re-identification codes of the respective tuple; and
provide information on the one or more sequences of locations,
where in each camera device of the plurality of camera devices is located in a different location.
2 . The system of claim 1 , wherein the processing circuitry of the evaluation device is configured to determine information on time spans associated with the one or more sequences of locations based on the timestamps associated with the transformed re-identification codes of the one or more tuples of transformed re-identification codes.
3 . The system of claim 1 , wherein each camera device of the plurality of camera devices is configured to capture media data in a non-overlapping field of view with other camera devices of the plurality of camera devices.
4 . The system of claim 1 , wherein the processing circuitry of the evaluation device is further configured to generate a display signal comprising a visualization of the information on the one or more sequences of locations.
5 . The system of claim 1 , wherein the re-identification code is generated using a hashing algorithm.