Image resolution enhancement in digital holography

3D information processing based on digital holography has been suffered from the problems of low-resolution image sensor that could undersample holographic images and small size of image sensor that limits the achievable reconstruction resolution. The existing solutions to these problems employ iterative algorithms to enhance the resolution of holographic images and increase effective size of image sensor, which are computationally expensive. This paper proposes to use fast noniterative multiframe image reconstruction technique for increasing the spatial resolution of digital holograms by combining multiple shifted low-resolution holographic images. The proposed method enhances the resolution with low computational cost and improves the reconstruction performance. Image stitching is also proposed to increase the effective size of image sensor and enhance the achievable resolution during reconstruction. Simulation results are presented to demonstrate the effectiveness of the proposed methods.