Abstract
We describe a new application of super-resolution image reconstruction to digital holography which is a technique for three-dimensional information recording and reconstruction. Digital holography has suffered from the low resolution of CCD sensors, which significantly limits the size of objects that can be recorded. The existing solution to this problem is to use optics to bandlimit the object to be recorded, which can cause the loss of details. Here super-resolution image reconstruction is proposed to be applied in enhancing the spatial resolution of digital holograms. By introducing a global camera translation before sampling, a high-resolution hologram can be reconstructed from a set of undersampled hologram images. This permits the recording of larger objects and reduces the distance between the object and the hologram. Practical results from real and simulated holograms are presented to demonstrate the feasibility of the proposed technique.
Highlights
Due to the physical limitations and cost of imaging sensors, it is difficult to obtain high-resolution images in many applications
This paper explores a new application of super resolution image reconstruction in digital holography, and analyzes and evaluates the corresponding super-resolution algorithm in the context of digital holography
The reference low-resolution hologram was obtained by decimation without shifting the high-resolution hologram, and the rest three low-resolution holograms were obtained by shifting the high-resolution hologram horizontally, vertically, and diagonally, respectively, by one pixel before decimation
Summary
Due to the physical limitations and cost of imaging sensors, it is difficult to obtain high-resolution images in many applications. This paper explores a new application of super resolution image reconstruction in digital holography, and analyzes and evaluates the corresponding super-resolution algorithm in the context of digital holography To my knowledge, this is the first time super-resolution is applied in enhancing the spatial resolution of digital holograms to overcome the problems caused by low-resolution sensor in digital holography. Digital holography is referred to as the technique that uses a CCD camera to record holographic patterns and performs the reconstruction numerically using a computer [13]. Digital holography has been limited to record small objects only This is due to the low spatial resolution of commercially available CCD arrays. The super-resolution algorithm used for hologram resolution enhancement and the obtained results are presented
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