Resolution Enhancement for Digital Off-Axis Hologram Reconstruction
A new method of digital off-axis hologram reconstruction based on the Fresnel transform is proposed. A combination of composite filtering, Abbe’s limitation, and digital lens formulae has been used with an appropriate handling of Fresnel impulse response propagator. A clear image of microscopic object is efficiently reconstructed from hologram using a plane wave with involvement of electric field along bi-cubic interpolation in the final reconstruction step. In particular, the proposed method automatically suppresses the zero order term and virtual image. The image can be reconstructed with large size using interpolation scheme with the Haar wavelet. The proposed method facilitates the transverse high resolution of microscopic image, which has better applicability than other approaches. Moreover, the advantages of this method are its simplicity and convenience in data processing.
KeywordsBi-cubic interpolation Digital holography Fresnel transforms Lens formula Microscopy Wavelet transforms
This work was by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (NRF-2011-0026245).
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