Super-resolved refocusing with a plenoptic camera

Zhiliang Zhou; Yan Yuan; Xiangli Bin; Lulu Qian

doi:10.1117/12.872447

7 February 2011 Super-resolved refocusing with a plenoptic camera

Zhiliang Zhou, Yan Yuan, Xiangli Bin, Lulu Qian

Proceedings Volume 7873, Computational Imaging IX; 787313 (2011) https://doi.org/10.1117/12.872447
Event: IS&T/SPIE Electronic Imaging, 2011, San Francisco Airport, California, United States

Abstract

This paper presents an approach to enhance the resolution of refocused images by super resolution methods. In plenoptic imaging, we demonstrate that the raw sensor image can be divided to a number of low-resolution angular images with sub-pixel shifts between each other. The sub-pixel shift, which defines the super-resolving ability, is mathematically derived by considering the plenoptic camera as equivalent camera arrays. We implement simulation to demonstrate the imaging process of a plenoptic camera. A high-resolution image is then reconstructed using maximum a posteriori (MAP) super resolution algorithms. Without other degradation effects in simulation, the super resolved image achieves a resolution as high as predicted by the proposed model. We also build an experimental setup to acquire light fields. With traditional refocusing methods, the image is rendered at a rather low resolution. In contrast, we implement the super-resolved refocusing methods and recover an image with more spatial details. To evaluate the performance of the proposed method, we finally compare the reconstructed images using image quality metrics like peak signal to noise ratio (PSNR).

Citation Download Citation

Zhiliang Zhou, Yan Yuan, Xiangli Bin, and Lulu Qian "Super-resolved refocusing with a plenoptic camera", Proc. SPIE 7873, Computational Imaging IX, 787313 (7 February 2011); https://doi.org/10.1117/12.872447

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