Extended Depth-of-Field Lensless Imaging using an Optimized Radial Mask
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2023
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| _version_ | 1866908612868177920 |
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| author | Neto, Jose Reinaldo Cunha Santos A V Silva Nakamura, Tomoya Makihara, Yasushi Yagi, Yasushi |
| author_facet | Neto, Jose Reinaldo Cunha Santos A V Silva Nakamura, Tomoya Makihara, Yasushi Yagi, Yasushi |
| contents | The freedom of design of coded masks used by mask-based lensless cameras is an advantage these systems have when compared to lens-based ones. We leverage this freedom of design to propose a shape-preserving optimization scheme for a radial-type amplitude coded mask. Due to the depth-independency of the radial mask's point spread function, they can be used for extending the effective depth of field (DOF) of a lensless imaging system. In this paper we optimized a coded mask for improved frequency response, while retaining its radial characteristics and therefore extended-DOF capabilities. We show that our optimized radial mask achieved better overall frequency response when compared to naive implementations of a radial mask. We also quantitatively and qualitatively demonstrated the extended DOF imaging achieved by our optimized radial mask in simulations by comparing it to different non-radial coded masks. Finally, we built a prototype camera to validate the extended DOF capabilities of our coded mask in real scenarios. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2303_11554 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Extended Depth-of-Field Lensless Imaging using an Optimized Radial Mask Neto, Jose Reinaldo Cunha Santos A V Silva Nakamura, Tomoya Makihara, Yasushi Yagi, Yasushi Image and Video Processing The freedom of design of coded masks used by mask-based lensless cameras is an advantage these systems have when compared to lens-based ones. We leverage this freedom of design to propose a shape-preserving optimization scheme for a radial-type amplitude coded mask. Due to the depth-independency of the radial mask's point spread function, they can be used for extending the effective depth of field (DOF) of a lensless imaging system. In this paper we optimized a coded mask for improved frequency response, while retaining its radial characteristics and therefore extended-DOF capabilities. We show that our optimized radial mask achieved better overall frequency response when compared to naive implementations of a radial mask. We also quantitatively and qualitatively demonstrated the extended DOF imaging achieved by our optimized radial mask in simulations by comparing it to different non-radial coded masks. Finally, we built a prototype camera to validate the extended DOF capabilities of our coded mask in real scenarios. |
| title | Extended Depth-of-Field Lensless Imaging using an Optimized Radial Mask |
| topic | Image and Video Processing |
| url | https://arxiv.org/abs/2303.11554 |