Enhanced-resolution by Sparse Synthetic Aperture with Fresnel Elements (S-SAFE) Conference Paper uri icon

abstract

  • we present an advanced configuration of an incoherent holographic imaging system with a partial synthetic aperture. The image resolution of the physical aperture-limited system is significantly enhanced although the synthetic aperture is sparse. In conventional diffraction-limited optics, the desire to provide an ultra-fine resolution requires a relatively large scale aperture size, which might be challenging in terms of weight, manufacturing and cost considerations. The synthetic aperture (SA) method is a well-known technique providing the ability to magnify the resolving power beyond the diffraction limits [1-3]. According to this method, several interference patterns are captured by an aperture-limited system from various points of view and are tiled into a new larger pattern, which can be considered to be formed by a virtual equivalent imaging system with a much wider aperture. In principle, it is possible to create a large scale SA consisting of many sub-holograms with relatively small apertures. However, in practice the task become extremely complicated with the requirement of tiling a large number of sub holograms into a complete continuous mosaic hologram. In this study, we present and demonstrate a new method of sparse SA, providing relatively high image resolution. The proposed method is dubbed sparse synthetic aperture with Fresnel elements (S-SAFE), creating a large scale effective aperture with a relatively small amount of sub-holograms, located in random positions without any positional constrains.

publication date

  • January 1, 2015