Controllable Spatial Filtering Method in Lensless Imaging
We propose a method for multiple-depth extraction in diffraction grating imaging. A diffraction grating can optically generate a diffraction image array (DIA) having parallax information about a three-dimensional (3D) object. The optically generated DIA has the characteristic of forming images perio...
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MDPI AG
2024-03-01
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| Series: | Electronics |
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| Online Access: | https://www.mdpi.com/2079-9292/13/7/1184 |
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| author | Jae-Young Jang Myungjin Cho |
| author_facet | Jae-Young Jang Myungjin Cho |
| author_sort | Jae-Young Jang |
| collection | DOAJ |
| description | We propose a method for multiple-depth extraction in diffraction grating imaging. A diffraction grating can optically generate a diffraction image array (DIA) having parallax information about a three-dimensional (3D) object. The optically generated DIA has the characteristic of forming images periodically, and the period depends on the depth of the object, the wavelength of the light source, and the grating period of the diffraction grating. The depth image can be extracted through the convolution of the DIA and the periodic delta function array. Among the methods for extracting depth images through the convolution characteristics of a parallax image array (PIA) and delta function array, an advanced spatial filtering method for the controllable extract of multiple depths (CEMD) has been studied as one of the reconstruction methods. And that possibility was confirmed through a lens-array-based computational simulation. In this paper, we aim to perform multiple-depth extraction by applying the CEMD method to a DIA obtained optically through a diffraction grating. To demonstrate the application of the CEMD in diffraction grating imaging, a theoretical analysis is performed to apply the CEMD in diffraction grating imaging; the DIA is acquired optically, and the spatial filtering process is performed through computational methods and then compared with the conventional single-depth extraction method in diffraction grating imaging. The application of the CEMD to DIA enables the simultaneous reconstruction of images corresponding to multiple depths through a single spatial filtering process. To the best of our knowledge, this is the first research on the extraction of multiple-depth images in diffraction grating imaging. |
| first_indexed | 2024-04-24T10:46:47Z |
| format | Article |
| id | doaj.art-8a7f8d639f7c4610992cb07c9b1dc4ed |
| institution | Directory Open Access Journal |
| issn | 2079-9292 |
| language | English |
| last_indexed | 2024-04-24T10:46:47Z |
| publishDate | 2024-03-01 |
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| series | Electronics |
| spelling | doaj.art-8a7f8d639f7c4610992cb07c9b1dc4ed2024-04-12T13:17:00ZengMDPI AGElectronics2079-92922024-03-01137118410.3390/electronics13071184Controllable Spatial Filtering Method in Lensless ImagingJae-Young Jang0Myungjin Cho1Department of Optometry, Eulji University, Seongnam-si 13135, Republic of KoreaSchool of ICT, Robotics, and Mechanical Engineering, Institute of Information and Telecommunication Convergence (IITC), Hankyong National University, Anseong 17579, Republic of KoreaWe propose a method for multiple-depth extraction in diffraction grating imaging. A diffraction grating can optically generate a diffraction image array (DIA) having parallax information about a three-dimensional (3D) object. The optically generated DIA has the characteristic of forming images periodically, and the period depends on the depth of the object, the wavelength of the light source, and the grating period of the diffraction grating. The depth image can be extracted through the convolution of the DIA and the periodic delta function array. Among the methods for extracting depth images through the convolution characteristics of a parallax image array (PIA) and delta function array, an advanced spatial filtering method for the controllable extract of multiple depths (CEMD) has been studied as one of the reconstruction methods. And that possibility was confirmed through a lens-array-based computational simulation. In this paper, we aim to perform multiple-depth extraction by applying the CEMD method to a DIA obtained optically through a diffraction grating. To demonstrate the application of the CEMD in diffraction grating imaging, a theoretical analysis is performed to apply the CEMD in diffraction grating imaging; the DIA is acquired optically, and the spatial filtering process is performed through computational methods and then compared with the conventional single-depth extraction method in diffraction grating imaging. The application of the CEMD to DIA enables the simultaneous reconstruction of images corresponding to multiple depths through a single spatial filtering process. To the best of our knowledge, this is the first research on the extraction of multiple-depth images in diffraction grating imaging.https://www.mdpi.com/2079-9292/13/7/11843D imagingdiffraction gratingdiffraction imagelensless imagingspatial filtering |
| spellingShingle | Jae-Young Jang Myungjin Cho Controllable Spatial Filtering Method in Lensless Imaging Electronics 3D imaging diffraction grating diffraction image lensless imaging spatial filtering |
| title | Controllable Spatial Filtering Method in Lensless Imaging |
| title_full | Controllable Spatial Filtering Method in Lensless Imaging |
| title_fullStr | Controllable Spatial Filtering Method in Lensless Imaging |
| title_full_unstemmed | Controllable Spatial Filtering Method in Lensless Imaging |
| title_short | Controllable Spatial Filtering Method in Lensless Imaging |
| title_sort | controllable spatial filtering method in lensless imaging |
| topic | 3D imaging diffraction grating diffraction image lensless imaging spatial filtering |
| url | https://www.mdpi.com/2079-9292/13/7/1184 |
| work_keys_str_mv | AT jaeyoungjang controllablespatialfilteringmethodinlenslessimaging AT myungjincho controllablespatialfilteringmethodinlenslessimaging |