The focus of the present paper is devoted to the thermal conductivity measurement of microwires or microfibers inserted in an homogeneous subrstrate plate. Some steday and mainly 1D heat transfer conditions are applied to the plate. When the size of the object of interest is almost at the spatial resolution limit of the thermal imaging system, the corresponding heat transfer parameters to be measured in microscale devices can be adressed through the analysis of the deformation of a mainly one-dimensional temperature field. The small target to be analyzed can then be considered as a perturbating inclusion, yielding a two-dimensional deformation of the heat flux lines. This twodimensional field can be processed directly through a local (pixel-to-pixel) approach [1].