Optical design of a multimodal imaging system

Liang, Rongguang; Wong, Vincent; McLaughlin, Paul O.

doi:10.1117/12.764751

Cited by 7 publications

(7 citation statements)

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“…Here, B is a distance between two cameras and Z is a distance from camera to object. The focal length of the camera is defined as f. [4] Increasing distance B between the two cameras can make a large disparity but a distorted image can be generated easily when z is not far from the object. If so, 8 degrees for parallax angle can be proper when the object distance (or working distance) is less than 30 mm.…”

Section: Design Approachmentioning

confidence: 99%

“…The lack of engineering in the delivery of the dental implant has paved the way for the new frontier of dental implants. [1][2][3][4][5] Hence, 3-dimensional scanning technology is not only expected to be used for dentistry but also to be applied for other medical fields. In particular, many researchers reported that various fringe projection methods were applied for getting three-dimensional images.…”

Section: Introductionmentioning

confidence: 99%

“…In the case of the fringe projection method, micro display or illumination parts can be needed to project on the teeth and reflective powder also can be needed depending on the light source. [1][2][3][4][5] The fringe projection method is not appropriate for scanning a small region of the inner mouth because a beam projector is needed to project patterns onto teeth. A beam projector has more complex structure and system performance, and user convenience can be restricted by total weight and resolution of displays.…”

Section: Introductionmentioning

confidence: 99%

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Development of Image-space Telecentric Lens for Intra-Oral 3D Scanner

Kim¹,

Shin²,

Chang³

et al. 2015

Journal of the Optical Society of Korea

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An image-space telecentric lens for an intra-oral 3D scanner was designed and fabricated for dental application. Since a telecentric function can provide the same results regardless of image plane position, it helps to realize a more accurate image for an intra-oral scanner. The performance of the designed lens meets the required properties for HD resolution. In particular, lateral color is corrected within 1 pixel. This system achieves depth of focus of more than 3 mm. For user convenience, the developed system consists of a prism part and an imaging part. Both parts are optimized to reduce the front size and weight of the system. In order to make the parallax sights, parallax angle was determined to be 8 degrees between two optical systems.

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Section: Design Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Development of Image-space Telecentric Lens for Intra-Oral 3D Scanner

Kim¹,

Shin²,

Chang³

et al. 2015

Journal of the Optical Society of Korea

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“…Reflective devices employing a perfect absorber have also been reported 27 28 29 . However, it is accepted that a trans-reflective color filter is categorically integral to such applications as the holography, fluorescence microscopy, CCD imaging, and so forth 31 32 . In order to efficiently manipulate the color saturation of its output, such a trans-reflective color filter is strongly preferred to allow a flexibly tailored bandwidth while preserving the resonant wavelength 21 .…”

mentioning

confidence: 99%

Trans-Reflective Color Filters Based on a Phase Compensated Etalon Enabling Adjustable Color Saturation

Park

Shrestha

Lee

et al. 2016

Sci Rep

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Trans-reflective color filters, which take advantage of a phase compensated etalon (silver-titania-silver-titania) based nano-resonator, have been demonstrated to feature a variable spectral bandwidth at a constant resonant wavelength. Such adjustment of the bandwidth is presumed to translate into flexible control of the color saturation for the transmissive and reflective output colors produced by the filters. The thickness of the metallic mirror is primarily altered to tailor the bandwidth, which however entails a phase shift associated with the etalon. As a result, the resonant wavelength is inevitably displaced. In order to mitigate this issue, we attempted to compensate for the induced phase shift by introducing a dielectric functional layer on top of the etalon. The phase compensation mediated by the functional layer was meticulously investigated in terms of the thickness of the metallic mirror, from the perspective of the resonance condition. The proposed color filters were capable of providing additive colors of blue, green, and red for the transmission mode while exhibiting subtractive colors of yellow, magenta, and cyan for the reflection mode. The corresponding color saturation was estimated to be efficiently adjusted both in transmission and reflection.

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“…By resorting to elevated index contrast between high and low index materials in a multilayer stack, we could acquire enhanced reflectivity while the transmission is significantly suppressed over a spectral range, thereby enabling the development of highly efficient structural trans-reflective colors, which may serve as subtractive and additive color filters in the transmission and reflection mode, respectively. Such trans-reflective color filters are key elements for various optical applications, including holography, CCD imaging, multispectral sensor, and fluorescence microscopy [20,21]. However, multilayer stacks serving as color filters in such trans-reflective configurations, which require an optimal stop band assuming an appropriate bandwidth within the visible regime, still have not been investigated.…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient Trans-Reflective Color Filters Incorporating TiO₂-MgF₂Multilayer Stacks

Shrestha

Park

Koirala

et al. 2015

Journal of the Optical Society of Korea

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We report for the first time highly efficient trans-reflective color filters capable of demonstrating coloration in both transmission and reflection modes by taking advantage of a multilayer stack consisting of MgF2 and TiO2 used respectively as the low and high index materials. In order to enable such trans-reflective performance, securing an optimal stop band assuming an appropriate bandwidth within the visible regime is pivotal, which was realized by tailoring the thicknesses and the numbers of TiO2-MgF2 bi-layers. Three devices were designed through rigorous simulations and developed via e-beam evaporation to demonstrate vivid blue, green, and red colors in the reflection mode, and yellow, magenta, and cyan colors in the transmission mode, featuring an enhanced efficiency exceeding 90% under normal incidence. The color performance of the filters was examined by referring to the chromaticity coordinates of the transmission and reflection spectra, alongside photographed color images. The dependence of the performance on the angle of incidence was explored with respect to incident polarization, indicating that a transmission surpassing 60% could be stably maintained up to an angle of 75°. Polarization independent transfer characteristics were especially achieved for the normal incidence. The proposed devices may be readily extended to other spectral regimes by adjusting the thicknesses of the films.

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Optical design of a multimodal imaging system

Cited by 7 publications

References 0 publications

Development of Image-space Telecentric Lens for Intra-Oral 3D Scanner

Development of Image-space Telecentric Lens for Intra-Oral 3D Scanner

Trans-Reflective Color Filters Based on a Phase Compensated Etalon Enabling Adjustable Color Saturation

Highly Efficient Trans-Reflective Color Filters Incorporating TiO₂-MgF₂Multilayer Stacks

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Optical design of a multimodal imaging system

Cited by 7 publications

References 0 publications

Development of Image-space Telecentric Lens for Intra-Oral 3D Scanner

Development of Image-space Telecentric Lens for Intra-Oral 3D Scanner

Trans-Reflective Color Filters Based on a Phase Compensated Etalon Enabling Adjustable Color Saturation

Highly Efficient Trans-Reflective Color Filters Incorporating TiO2-MgF2Multilayer Stacks

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Highly Efficient Trans-Reflective Color Filters Incorporating TiO₂-MgF₂Multilayer Stacks