Method and a thermal camera having a microbolometer detector for capturing a sequence of image frames

A non-transitory computer readable medium comprising computer code instructions which when executed by a processor configure the processor cause a thermal camera having a microbolometer detector to:

• capture a first sequence of image frames with a shutter of the thermal camera being in a closed state and while switching an integration time of the microbolometer detector between a plurality of integration times according to one or more first repetitions of a temporal pattern of integration times,
• capture a second sequence of image frames with the shutter of the thermal camera being in an open state and while switching the integration time of the microbolometer detector between the plurality of integration times according to one or more second repetitions of the same temporal pattern of integration times, and
• correct, by subtraction, image frames in the second sequence that are captured when the integration time is switched to a particular position within the temporal pattern of integration times using image frames in the first sequence that are captured when the integration time is switched to the same particular position within the temporal pattern of integration times.