Apparatus and method to calculate energy dissipated from an object

An apparatus comprising:

• a thermal radiation capturing arrangement configured to capture thermal radiation data of an imaged view;
• one or more input control units configured to receive manual inputs from a user of the apparatus and further to output the manual inputs as user input information;
• and
• a processor configured to:
• receive the thermal radiation data from the thermal radiation capturing arrangement,
• receive the user input information from at least one of the one or more input control units,
• determine a radiated temperature reference value and a convection temperature reference value representing temperatures of an environment surrounding an object in the imaged view, and
• calculate an object power value indicative of an amount of energy dissipated from the object in the imaged view based on at least:
• a radiation power value based on at least the radiated temperature reference value and a portion of the thermal radiation data corresponding to the object, and
• a convection power value based on at least the convection temperature reference value and the portion of the thermal radiation data corresponding to the object.