Experimental investigation of improving image resolution by spectrum shifting

High frequencies beyond the cut-off frequency could pass through imaging systems after spectrum shifting, which is one of high resolution imaging technologies. The effect of this technology is obvious but difficult to achieve. To verify its feasibility and provide references for practical application, an experimental scheme has been put forward. In this scheme, the stripe field of laser interference is replaced by a cosine grating, and the imaging system is constituted by a CCD camera and a one-dimensional low-pass filter implemented by software. For the stripe field has to be moved several times equidistantly in one cycle, in this scheme, the motion of the stripe field is replaced by the translation of the cosine grating. During the experiment, the cosine grating was translated four times