The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
Xiao Shen - One of the best experts on this subject based on the ideXlab platform.
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Error analysis and optimal design of reduction Relay Lens for field of view stitching applications
Sensor Review, 2021Co-Authors: Xinjie Zhang, Fansen Kong, Xiao ShenAbstract:Purpose FOV splicing optical remote sensing instruments have a strict requirement for the focal length consistency of the Lens. In conventional optical-mechanical structure design, each optical element is equally distributed with high accuracy and everyone must have a high machining and assembly accuracy. For optical remote sensors with a large number of optical elements, this design brings great difficulties to Lens manufacture and alignment. Design/methodology/approach Taking the Relay Lens in an optical remote sensing instrument with the field of view splicing as an example, errors of the system are redistributed to optical elements. Two optical elements, which have the greatest influence on modulation transfer function (MTF) of the system are mounted with high accuracy centering and the other elements are fixed by gland ring with common machining accuracy. The reduction ratio consistency difference among Lenses is compensated by adjusting the optical spacing between the two elements. Findings Based on optical system simulation analysis, the optimized structure can compensate for the difference of reduction ratio among Lens by grinding the washer thickness in the range of ±0.37 mm. The test data for the image quality of the Lens show that the MTF value declined 0.043 within ±0.4 mm of space change between two barrels. The results indicate that the reduction ratio can be corrected by adjusting the washer thickness and the image quality will not obviously decline. Originality/value This paper confirms that this work is original and has not been published elsewhere nor is it currently under consideration for publication elsewhere. In this paper, the optimum structural design of the reduction Relay Lens for the field of view stitching applications is reported. The method of adjusting washer thickness is applied to compensate for the reduction ratio consistency difference of Lenses. The optimized structure also greatly reduces the difficulty of Lenses manufacture, alignment and improves the efficiency of assembly.
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error analysis and optimal design of reduction Relay Lens for field of view stitching applications
Sensor Review, 2021Co-Authors: Xinjie Zhang, Fansen Kong, Xiao ShenAbstract:FOV splicing optical remote sensing instruments have a strict requirement for the focal length consistency of the Lens. In conventional optical-mechanical structure design, each optical element is equally distributed with high accuracy and everyone must have a high machining and assembly accuracy. For optical remote sensors with a large number of optical elements, this design brings great difficulties to Lens manufacture and alignment.,Taking the Relay Lens in an optical remote sensing instrument with the field of view splicing as an example, errors of the system are redistributed to optical elements. Two optical elements, which have the greatest influence on modulation transfer function (MTF) of the system are mounted with high accuracy centering and the other elements are fixed by gland ring with common machining accuracy. The reduction ratio consistency difference among Lenses is compensated by adjusting the optical spacing between the two elements.,Based on optical system simulation analysis, the optimized structure can compensate for the difference of reduction ratio among Lens by grinding the washer thickness in the range of ±0.37 mm. The test data for the image quality of the Lens show that the MTF value declined 0.043 within ±0.4 mm of space change between two barrels. The results indicate that the reduction ratio can be corrected by adjusting the washer thickness and the image quality will not obviously decline.,This paper confirms that this work is original and has not been published elsewhere nor is it currently under consideration for publication elsewhere. In this paper, the optimum structural design of the reduction Relay Lens for the field of view stitching applications is reported. The method of adjusting washer thickness is applied to compensate for the reduction ratio consistency difference of Lenses. The optimized structure also greatly reduces the difficulty of Lenses manufacture, alignment and improves the efficiency of assembly.
Young Ghi Hong - One of the best experts on this subject based on the ideXlab platform.
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Application of a diffractive/refractive hybrid Lens for a night-vision Relay Lens system
Diffractive and Holographic Device Technologies and Applications V, 1998Co-Authors: Young Ghi Hong, Young-joon Kim, Chul Koo LeeAbstract:Night-vision Relay Lens system with a diffractive/refractive hybrid Lens which Relays the image between the phosphor image plane of an image intensifying tube and a 35 mm film single-Lens reflex camera was designed and made. The optical system consists of 5 Lenses including 1 diffractive/refractive hybrid Lens, whereas the conventional all refractive Lens system has 7 Lenses. After design and manufacture we compared the optical performances of both two Lens systems. Since diffractive/refractive hybrid Lens has an excellent feature to correct chromatic aberrations in the broad bandwidth visible spectral region, we could obtain the much higher resolution and better image quality from the Lens system with the hybrid Lens than those from the conventional Lens system. The diffractive surface was fabricated with photolithographic methods to get 8 leveled zone structure and its micro profiles were inspected with scanning electron microscopy and atomic force microscope.
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application of a diffractive refractive hybrid Lens for a night vision Relay Lens system
High-power lasers and applications, 1998Co-Authors: Young Ghi Hong, Young-joon Kim, Chul LeeAbstract:Night-vision Relay Lens system with a diffractive/refractive hybrid Lens which Relays the image between the phosphor image plane of an image intensifying tube and a 35 mm film single-Lens reflex camera was designed and made. The optical system consists of 5 Lenses including 1 diffractive/refractive hybrid Lens, whereas the conventional all refractive Lens system has 7 Lenses. After design and manufacture we compared the optical performances of both two Lens systems. Since diffractive/refractive hybrid Lens has an excellent feature to correct chromatic aberrations in the broad bandwidth visible spectral region, we could obtain the much higher resolution and better image quality from the Lens system with the hybrid Lens than those from the conventional Lens system. The diffractive surface was fabricated with photolithographic methods to get 8 leveled zone structure and its micro profiles were inspected with scanning electron microscopy and atomic force microscope.
Tie Jun Cui - One of the best experts on this subject based on the ideXlab platform.
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Design and experiment of perfect Relay Lens based on the Schwarz-Christoffel mapping
Applied Physics Letters, 2014Co-Authors: Fan Yang, Zhong Lei Mei, Tie Jun CuiAbstract:We propose and experimentally demonstrate a planar perfect Relay Lens using the modified Schwarz-Christoffel (SC) mapping. Based on the SC mapping, a Maxwell fisheye Lens is conformally transformed into a slab exactly, realizing a perfect Relay Lens. Both geometrical optics and wave optics are utilized to verify the excellent imaging performance from surface to surface. The proposed Relay Lens is implemented using fractal metamaterials with the H-shaped particles and the experimental result shows good agreement to the numerical simulation. The proposed design has many potential applications, such as the night vision system, endoscopes, microscopes, and photocopiers.
Cheng-chung Lee - One of the best experts on this subject based on the ideXlab platform.
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ORIGINAL ARTICLE Biopsy Diagnosis of Oral Carcinoma by the Combination of Morphological and Spectral Methods Based on Embedded Relay Lens Microscopic Hyperspectral Imaging System
2016Co-Authors: Mang Ou-yang, Yaofang Hsieh, Cheng-chung LeeAbstract:Abstract Cytopathological examination through biopsy is very important for carcinoma detection. The embedded Relay Lens microscopic hyperspectral imaging system (ERL-MHIS) provides a morphological image of a biopsy sample and the spectrum of each pixel in the image simultaneously. Based on the ERL-MHIS, this work develops morphological and spectral methods to diagnose oral carcinoma biopsy. In morphological discrimination, the fractal dimension method is applied to differentiate between normal and abnormal tissues. In spectral identifi-cation, normal and cancerous cells are distinguished using five methods. However, the spectra of normal and cancerous cells vary with patient. The diagnostic perfor-mances of the five methods are thus not ideal. Hence, the proposed cocktail approach is used to determine the effectiveness of the spectral methods in correlating with the sampling conditions. And then we use a combination of effective spectral methods according to the sample condi-tions for diagnosing a sample. A total of 68 biopsies from 34 patients are analyzed using the ERL-MHIS. The results demonstrate a sensitivity of 90 ± 4.53 % and a specificity of 87.8 ± 5.21 %. Furthermore, in our survey, this system is the first time utilized to study oral carcinoma biopsies
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Development of a Novel Embedded Relay Lens Microscopic Hyperspectral Imaging System for Cancer Diagnosis: Use of the Mice with Oral Cancer to Be the Example
International Journal of Spectroscopy, 2012Co-Authors: Yaofang Hsieh, Mang Ou-yang, Jeng-ren Duann, Jin-chern Chiou, Nai-wen Chang, Chia Ing Jan, Ming Hsui Tsai, Yung-jiun Lin, Cheng-chung LeeAbstract:This paper develops a novel embedded Relay Lens microscopic hyperspectral imaging system (ERL-MHSI) with high spectral resolution (nominal spectral resolution of 2.8 nm) and spatial resolution (30 μm × 10 μm) for cancer diagnosis. The ERL-MHSI system has transmittance and fluorescence mode. The transmittance can provide the morphological information for pathological diagnosis, and the fluorescence of cells or tissue can provide the characteristic signature for identification of normal and abnormal. In this work, the development of the ERL-MHSI system is discussed and the capability of the system is demonstrated by diagnosing early stage oral cancer of twenty mice in vitro. The best sensitivity for identifying normal cells and squamous cell carcinoma (SCC) was 100%. The best specificity for identifying normal cells and SCC was 99%. The best sensitivity for identifying normal cells and dysplasia was 99%. The best specificity for identifying normal cells and dysplasia was 97%. This work also utilizes fractal dimension to analyze the morphological information and find the significant different values between normal and SCC.
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Finite conjugate embedded Relay Lens hyperspectral imaging system (ERL-HIS)
Applied Optics, 2011Co-Authors: Yaofang Hsieh, Mang Ou-yang, Cheng-chung LeeAbstract:We present a novel embedded Relay Lens hyperspectral imaging system (ERL-HIS) with high spectral resolution (nominal spectral resolution of 2.8 nm) and spatial resolution (30 μm×8 μm) that transfers the scanning plane to an additional imaging plane through the internal Relay Lens so as to alleviate all outside moving parts for the scanning mechanism used in the traditional HIS, where image scanning is achieved by the relative movement between the object and hyperspectrometer. The ERL-HIS also enables high-speed scanning and can attach to a variety of optical modules for versatile applications. Here, we also demonstrate an application of the proposed ERL-HIS attached to a microscopic system for observing autofluorescent images of sliced cancer tissue samples.
Yaofang Hsieh - One of the best experts on this subject based on the ideXlab platform.
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ORIGINAL ARTICLE Biopsy Diagnosis of Oral Carcinoma by the Combination of Morphological and Spectral Methods Based on Embedded Relay Lens Microscopic Hyperspectral Imaging System
2016Co-Authors: Mang Ou-yang, Yaofang Hsieh, Cheng-chung LeeAbstract:Abstract Cytopathological examination through biopsy is very important for carcinoma detection. The embedded Relay Lens microscopic hyperspectral imaging system (ERL-MHIS) provides a morphological image of a biopsy sample and the spectrum of each pixel in the image simultaneously. Based on the ERL-MHIS, this work develops morphological and spectral methods to diagnose oral carcinoma biopsy. In morphological discrimination, the fractal dimension method is applied to differentiate between normal and abnormal tissues. In spectral identifi-cation, normal and cancerous cells are distinguished using five methods. However, the spectra of normal and cancerous cells vary with patient. The diagnostic perfor-mances of the five methods are thus not ideal. Hence, the proposed cocktail approach is used to determine the effectiveness of the spectral methods in correlating with the sampling conditions. And then we use a combination of effective spectral methods according to the sample condi-tions for diagnosing a sample. A total of 68 biopsies from 34 patients are analyzed using the ERL-MHIS. The results demonstrate a sensitivity of 90 ± 4.53 % and a specificity of 87.8 ± 5.21 %. Furthermore, in our survey, this system is the first time utilized to study oral carcinoma biopsies
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biopsy diagnosis of oral carcinoma by the combination of morphological and spectral methods based on embedded Relay Lens microscopic hyperspectral imaging system
Journal of Medical and Biological Engineering, 2015Co-Authors: Mang Ouyang, Yaofang HsiehAbstract:Cytopathological examination through biopsy is very important for carcinoma detection. The embedded Relay Lens microscopic hyperspectral imaging system (ERL-MHIS) provides a morphological image of a biopsy sample and the spectrum of each pixel in the image simultaneously. Based on the ERL-MHIS, this work develops morphological and spectral methods to diagnose oral carcinoma biopsy. In morphological discrimination, the fractal dimension method is applied to differentiate between normal and abnormal tissues. In spectral identification, normal and cancerous cells are distinguished using five methods. However, the spectra of normal and cancerous cells vary with patient. The diagnostic performances of the five methods are thus not ideal. Hence, the proposed cocktail approach is used to determine the effectiveness of the spectral methods in correlating with the sampling conditions. And then we use a combination of effective spectral methods according to the sample conditions for diagnosing a sample. A total of 68 biopsies from 34 patients are analyzed using the ERL-MHIS. The results demonstrate a sensitivity of 90 ± 4.53 % and a specificity of 87.8 ± 5.21 %. Furthermore, in our survey, this system is the first time utilized to study oral carcinoma biopsies.
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Development of a Novel Embedded Relay Lens Microscopic Hyperspectral Imaging System for Cancer Diagnosis: Use of the Mice with Oral Cancer to Be the Example
International Journal of Spectroscopy, 2012Co-Authors: Yaofang Hsieh, Mang Ou-yang, Jeng-ren Duann, Jin-chern Chiou, Nai-wen Chang, Chia Ing Jan, Ming Hsui Tsai, Yung-jiun Lin, Cheng-chung LeeAbstract:This paper develops a novel embedded Relay Lens microscopic hyperspectral imaging system (ERL-MHSI) with high spectral resolution (nominal spectral resolution of 2.8 nm) and spatial resolution (30 μm × 10 μm) for cancer diagnosis. The ERL-MHSI system has transmittance and fluorescence mode. The transmittance can provide the morphological information for pathological diagnosis, and the fluorescence of cells or tissue can provide the characteristic signature for identification of normal and abnormal. In this work, the development of the ERL-MHSI system is discussed and the capability of the system is demonstrated by diagnosing early stage oral cancer of twenty mice in vitro. The best sensitivity for identifying normal cells and squamous cell carcinoma (SCC) was 100%. The best specificity for identifying normal cells and SCC was 99%. The best sensitivity for identifying normal cells and dysplasia was 99%. The best specificity for identifying normal cells and dysplasia was 97%. This work also utilizes fractal dimension to analyze the morphological information and find the significant different values between normal and SCC.
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Finite conjugate embedded Relay Lens hyperspectral imaging system (ERL-HIS)
Applied Optics, 2011Co-Authors: Yaofang Hsieh, Mang Ou-yang, Cheng-chung LeeAbstract:We present a novel embedded Relay Lens hyperspectral imaging system (ERL-HIS) with high spectral resolution (nominal spectral resolution of 2.8 nm) and spatial resolution (30 μm×8 μm) that transfers the scanning plane to an additional imaging plane through the internal Relay Lens so as to alleviate all outside moving parts for the scanning mechanism used in the traditional HIS, where image scanning is achieved by the relative movement between the object and hyperspectrometer. The ERL-HIS also enables high-speed scanning and can attach to a variety of optical modules for versatile applications. Here, we also demonstrate an application of the proposed ERL-HIS attached to a microscopic system for observing autofluorescent images of sliced cancer tissue samples.