Superresolution by Multiple Superposition of Image Holograms Having Different Carrier Frequencies

A new technique of superresolution which makes use of a multi-exposed image hologram is described. The basic idea of this method is to use the hologram as storage medium for complex amplitude of the image of an object to be superresolved and to add up the complex amplitudes of the images of different spatial frequency ranges by multiple exposure on the hologram to synthesize the superresolved image. In this paper, a detailed analysis of the theory of this method, and the results of experiments for one-dimensional and two-dimensional objects, are presented. As a whole, the bandwidth of the optical system could be extended to the theoretically expected value.