Lensless Edge Enhancement Imaging Technology Based on Spiral Zone Aperture

Zhanquan Tian; Lina Li; Da Sun; Jianshe Ma; Ping Su

doi:10.3788/LOP223452

Journals >Laser & Optoelectronics Progress >Volume 60 >Issue 8 >Page 0811022 > Article

Laser & Optoelectronics Progress
Vol. 60, Issue 8, 0811022 (2023)

Lensless Edge Enhancement Imaging Technology Based on Spiral Zone Aperture

Zhanquan Tian, Lina Li, Da Sun, Jianshe Ma, and Ping Su^*

Author Affiliations

Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, Guangdong, China

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DOI: 10.3788/LOP223452 Cite this Article Set citation alerts

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 Copy Citation Text

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Fig. 1. Schematic of a lensless edge enhancement system based on spiral zone aperture coding

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SZA edge-enhanced imaging simulation results. (a) Original image; (b) holograph-like image obtained by a sensor; (c) reconstructed image withHS; (d) reconstructed image with HLG; (e) LG modulation term; (f)-(j) Re part of reconstructed images with H(r,θ0) in which θ0 is 0, π/4, π/2, 3π/4, π

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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Condition	$W_{F W H M}$ /pixel		Average $W_{F W H M}$ /pixel
Condition	Left	Right	Average $W_{F W H M}$ /pixel
$F Z A_H$	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

Table 1. Side width corresponding to the line in Fig. 8

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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