Lensless Edge Enhancement Imaging Technology Based on Spiral Zone Aperture

Fig. 2. SZA edge-enhanced imaging simulation results. (a) Original image; (b) holograph-like image obtained by a sensor; (c) reconstructed image with $H_{S}$ ; (d) reconstructed image with $H_{L G}$ ; (e) LG modulation term; (f)-(j) Re part of reconstructed images with $H (r, θ_{0})$ in which $θ_{0}$ is 0, $π / 4$ , $π / 2$ , $3 π / 4$ , $π$

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Fig. 3. Cameraman SZA simulation results. (a) Original image; (b) reconstructed image with $H_{S}$ ; (c) intensity part of reconstructed image with $H$ ; (d) intensity part of reconstructed image with $H_{L G}$

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Fig. 4. Simulation results of different zone plate constants of SZA. (a) Original image; (b) $r_{1} = 0.32 m m$ ; (c) $r_{1} = 0.25 m m$

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Fig. 5. Lensless imaging system vs. lens system. (a) Mobile phone photo; (b) edge extraction; (c) lensless imaging; (d) edge -enhanced lensless imaging

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Fig. 6. SZA reconstructed images. (a) Re part; (b) Im part; (c) Intensity part; (d)-(f) corresponding reconstruction results by introduction of LG modulation term

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Fig. 7. SZA anisotropic edge enhancement results. (a)-(e) Re part of reconstructed images with $H (r, θ_{0})$ in which $θ_{0}$ is 0, $π / 4$ , $π / 2$ , $3 π / 4$ , $π$ ; (f)-(j) corresponding reconstruction results by introduction of LG modulation term

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Fig. 8. Comparison of FZA and SZA reconstructions. (a)-(c) Intensity of FZA reconstructed images with $H$ , $H_{S}$ , $H_{L G_S}$ ; (d)-(f) intensity of SZA reconstructed images with $H_{S}$ , $H$ , $H_{L G}$

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Fig. 9. Intensity distribution along the line in Fig. 8

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Table 1. Side width corresponding to the line in Fig. 8
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Table 1. Side width corresponding to the line in Fig. 8
Condition $W_{F W H M}$ /pixel Average $W_{F W H M}$ /pixel
Left Right
$F Z A_H$ 6.96 6.96
$F Z A_H_{S}$ 4.69 3.84 4.27
$F Z A_H_{L G_S}$ 5.54 4.88 5.21
$S Z A_H_{S}$ 7.05 7.05
$S Z A_H$ 4.30 3.72 4.01
$S Z A_H_{L G}$ 5.50 4.80 5.15

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Zhanquan Tian, Lina Li, Da Sun, Jianshe Ma, Ping Su. Lensless Edge Enhancement Imaging Technology Based on Spiral Zone Aperture[J]. Laser & Optoelectronics Progress, 2023, 60(8): 0811022

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