System for identifying a defined object

A system for identifying a defined hazard, the system comprising:

• at least one sensor configured to detect data to define a digital representation of a scene;
• a processor communicatively connected to the at least one sensor, the processor configured to execute at least two techniques, each technique configured to identify a signature defined by the defined hazard;
• and
• a memory communicatively connected to the processor, the memory storing reference data relating to at least two signatures derived, respectively, by the at least two techniques;
• wherein the processor is configured so that responsive to the processor receiving data from the at least one sensor defining the digital representation, the processor:
• executes the at least two techniques, causing each technique to:
• assess the digital representation to identify any signature candidate defined by the scene;
• derive feature data from each identified signature candidate;
• compare the feature data to the reference data;
• and
• derive a likelihood value from each comparison, each likelihood value indicating a likelihood of the signature candidate corresponding with the respective signature;
• combines at least some of the likelihood values to derive a composite likelihood value;
• and
• determines, from the composite likelihood value, whether the scene in the digital representation includes the defined hazard.