It is disclosed a thermal imaging device having a scan mechanism operable to effectuate sequentially predetermined offsets, each configured between a thermal image of thermal radiations in a defined area on an imaging plane and an array of micro mirrors configured on a substrate. A respective image of a light pattern of a light beam reflected by a light reflection portion of each respective micro mirror in the array can be captured, when a rotation of the respective micro mirror, caused by radiation incident on a radiation absorption surface of the respective micro mirror, is stabilized at a respective offset. After computing a respective measurement of intensity measured by the respective micro mirror based on the respective image captured for the respective offset, a processor computes measurements of intensity of radiation in sub-areas of the thermal image, from measurements of intensity for the predetermined offsets, to generate a high resolution output.