In this work, a recently proposed optical imaging technique, IMM (Interscale Mixing Microscopy) is considered. Method is based on enhancing the signal coming from a subwavelength object, owing to presence of a reference object in its close proximity, with well-defined far-field spectrum (for example a two dimensional diffractive grating). Thanks to this mechanisms, it is possible to restore part of informations about the subwavelength object from a far-field measurement. Aim of the work was theoretical-numerical analysis of the possibilities and limitations of the method. In this work, several methods of IMM signal analysis were proposed, as well as optimisation algorithms: evolutionary and simulated annealing algorithm (based on cost functions involving L1 or L2 norm), enabling restoration of objects' position on the grating and its size/shape.