An adaptive anisotropic magnification algorithm of numerical reconstructed holographic image via a cascaded Fresnel transform

An algorithm that allows a direct control of output resolution of a numerical reconstructed holographic image by a cascaded Fresnel transform is presented. The proposed method is mainly expressed with the magnification term in order to eliminate the cumbersome distance tuning for providing a desired resolution. Also, with the benefit of the numerical Fresnel transform separability, the method has a capability to perform an anisotropic magnification for resizing the output resolution in orthogonal direction. The used range of the magnification values has been established with the Nyquist sampling-theorem. Simulated and experimental results are provided to show the effectiveness of the proposed method. Furthermore, it is extremely useful for the superposition or for the comparison of the reconstructed images at multi-scale resolutions.