Odd symmetrical square-root phase mask to extend the depth of field in wavefront-coded imaging systems

Le, Van Nhu; Chen, Shouqian; Fan, Zhigang; Zhang, Wang

doi:10.1016/j.ijleo.2015.07.109

Cited by 8 publications

(1 citation statement)

References 10 publications

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“…However, this method generates the low optical intensity and the severely degraded the spatial resolution. In 1995 years, wavefront coding technique has been developed by Dowski et al to increase the depth of eld [11]. For wavefront coding technique, the phase mask is placed at the pupil plane of the imaging system to obtain the image near invariant over the big range of the depth of eld.…”

Section: Introductionmentioning

confidence: 99%

Removing Image Artifacts of Wavefront Coding Technique to Improve Drone Detection

Le,

2024

Preprint

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Wavefront coding is a useful technique which is employed to widen the depth of field. However, image artifacts are shown up on the restored image for asymmetric phase masks, which leads the degraded image quality. In this paper, we introduce a novel method based on the combination between the Inverse filter and the structure of Unet model to remove the image artifacts on the restored images. Another meaningfulness of this method is that the precision for drone detection will also be enhanced. The simulation will show the results for ability of drone detection by using the traditional optical system, the traditional wavefront coding and the proposed method. These results demonstrated that the combination between the Inverse filter with Unet model can be used to improve the precision of drone detecting over the big range of depth of field.

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Section: Introductionmentioning

confidence: 99%

Removing Image Artifacts of Wavefront Coding Technique to Improve Drone Detection

Le,

2024

Preprint

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Imaging quality improvement for wavefront colding system with radially symmetrical phase mask

2023

Opt Quant Electron

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In this paper, we introduce the novel method to improve the image quality of the optical imaging system with the radially symmetrical phase masks. By introduced a 0-π phase mask into the radially symmetrical phase mask, the new phase mask is generated, which produces the dark-shape point spread function.Next, by rotating this phase mask with the amplitude mask for different angles, the point spread function is rotated by the same angle. After, the digital processing is used to restore the high-quality image. The simulation results demonstrated the effectiveness of the proposed method in comparison to the previously radially symmetrical phase mask.

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Integrative optimization of the practical wavefront coding systems for depth-of-field extension

Zhao

Zhang

et al. 2017

Optik

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Odd symmetrical square-root phase mask to extend the depth of field in wavefront-coded imaging systems

Cited by 8 publications

References 10 publications

Removing Image Artifacts of Wavefront Coding Technique to Improve Drone Detection

Removing Image Artifacts of Wavefront Coding Technique to Improve Drone Detection

Imaging quality improvement for wavefront colding system with radially symmetrical phase mask

Integrative optimization of the practical wavefront coding systems for depth-of-field extension

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