Imaging Sensors and Systems最新文献_第3页

A single chip PPG sensor with enhanced IR sensitivity for low power and small size 单芯片PPG传感器，具有增强的红外灵敏度，低功耗和小尺寸

Imaging Sensors and Systems Pub Date : 2021-01-18 DOI: 10.2352/issn.2470-1173.2021.7.iss-066

Jungwook Lim, Jihun Kim, Long Yan, Hyunpil Noh, Seungki Jung, D. Seol, J. Pyo, T. Jung, Jungbin Yun, Dukseo Park, Howoo Park, Kyungho Lee, T. Nagano, JungChak Ahn

{"title":"A single chip PPG sensor with enhanced IR sensitivity for low power and small size","authors":"Jungwook Lim, Jihun Kim, Long Yan, Hyunpil Noh, Seungki Jung, D. Seol, J. Pyo, T. Jung, Jungbin Yun, Dukseo Park, Howoo Park, Kyungho Lee, T. Nagano, JungChak Ahn","doi":"10.2352/issn.2470-1173.2021.7.iss-066","DOIUrl":"https://doi.org/10.2352/issn.2470-1173.2021.7.iss-066","url":null,"abstract":"\u0000 A single chip Photoplethysmography(PPG) sensor was developed for continuous measurements of heart rate from a mobile device. In order to utilize it in various mobile applications, it was necessary to achieve low power and small size of PPG sensors. For low power and small chip size\u0000 of the PPG sensor, a photodiode(PD) for sensing signals and an analog front end(AFE) for signal amplification and ADC should be implemented in a single chip. The single chip PPG sensor which is implemented on a standard CMOS process with low operating voltage could be more suitable for mobile\u0000 devices. In order to operate at a low voltage, reduction of Si thickness is required, and for this, high quantum efficiency(QE) of 43% at 940nm were obtained at 3um thickness by back side trench(BST) pattern and ARL optimization. In addition, to improve the performance of the PPG sensor, the\u0000 leakage current of <0.1nA and capacitance of <200pF were measured by 20um pixel array. As a result, the low-power, small size single-chip PPG sensor showed similar performance to conventional high-voltage and large PPG sensor.\u0000","PeriodicalId":121190,"journal":{"name":"Imaging Sensors and Systems","volume":"130 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132288318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Under Display Camera Quad Bayer Raw Image Restoration using Deep Learning 基于深度学习的Bayer Raw图像恢复

Imaging Sensors and Systems Pub Date : 2021-01-18 DOI: 10.2352/issn.2470-1173.2021.7.iss-067

I. Kim, Yunseok Choi, Hayoung Ko, Dongpan Lim, Youngil Seo, Jeongguk Lee, Geunyoung Lee, Eun-sil Heo, S. Song, Sukhwan Lim

{"title":"Under Display Camera Quad Bayer Raw Image Restoration using Deep Learning","authors":"I. Kim, Yunseok Choi, Hayoung Ko, Dongpan Lim, Youngil Seo, Jeongguk Lee, Geunyoung Lee, Eun-sil Heo, S. Song, Sukhwan Lim","doi":"10.2352/issn.2470-1173.2021.7.iss-067","DOIUrl":"https://doi.org/10.2352/issn.2470-1173.2021.7.iss-067","url":null,"abstract":"\u0000 Can a mobile camera see better through display? Under Display Camera (UDC) is the most awaited feature in mobile market in 2020 enabling more preferable user experience, however, there are technological obstacles to obtain acceptable UDC image quality. Mobile OLED panels are struggling\u0000 to reach beyond 20% of light transmittance, leading to challenging capture conditions. To improve light sensitivity, some solutions use binned output losing spatial resolution. Optical diffraction of light in a panel induces contrast degradation and various visual artifacts including image\u0000 ghosts, yellowish tint etc. Standard approach to address image quality issues is to improve blocks in the imaging pipeline including Image Signal Processor (ISP) and deblur block. In this work, we propose a novel approach to improve UDC image quality - we replace all blocks in UDC pipeline\u0000 with all-in-one network – UDC d^Net. Proposed solution can deblur and reconstruct full resolution image directly from non-Bayer raw image, e.g. Quad Bayer, without requiring remosaic algorithm that rearranges non-Bayer to Bayer. Proposed network has a very large receptive field and can\u0000 easily deal with large-scale visual artifacts including color moiré and ghosts. Experiments show significant improvement in image quality vs conventional pipeline – over 4dB in PSNR on popular benchmark - Kodak dataset.\u0000","PeriodicalId":121190,"journal":{"name":"Imaging Sensors and Systems","volume":"201 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128038531","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Estimation of any fields of lens PSFs for image simulation 用于图像模拟的任意场的透镜psf估计

Imaging Sensors and Systems Pub Date : 2021-01-18 DOI: 10.2352/issn.2470-1173.2021.7.iss-072

Sangmin Kim, Daekwan Kim, Ki-Chung Chung, J. Yim

{"title":"Estimation of any fields of lens PSFs for image simulation","authors":"Sangmin Kim, Daekwan Kim, Ki-Chung Chung, J. Yim","doi":"10.2352/issn.2470-1173.2021.7.iss-072","DOIUrl":"https://doi.org/10.2352/issn.2470-1173.2021.7.iss-072","url":null,"abstract":"\u0000 In a mobile smartphone camera, image quality is more degraded towards the edges of an image sensor due to high CRA (Chief Ray Angle). It is critical to estimate the cause of this effect since image quality is degraded at image periphery from attenuating illuminance and broadening\u0000 PSF (point spread function). In order to predict image quality from the center to the edge of the camera output, we propose a method to estimate lens PSFs at any particular image field. The method adopts Zernike polynomials to consider lens aberrations while having an arbitrary spatial sampling.\u0000 Also, it employs estimating a pupil shape in accordance with an optical field. The proposed method has two steps: 1) estimation of a pupil shape and Zernike polynomial coefficients, and 2) generation of a PSF with estimated parameters. The method was experimented with a typical mobile lens\u0000 to evaluate the performance of the PSF estimation at 0.0F and 0.8F. In addition, Siemens star images were generated with the estimated PSFs to compare resolutions at the center and the edge of an image. The results show that the image of the edge is worse than that of the center in terms of\u0000 MTF (Modulation Transfer Function), showing the importance of assessing image quality at the edge for pre-evaluation of a mobile camera.\u0000","PeriodicalId":121190,"journal":{"name":"Imaging Sensors and Systems","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134353342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Validation of image systems simulation technology using a Cornell Box 使用康奈尔盒子验证图像系统仿真技术

Imaging Sensors and Systems Pub Date : 2021-01-18 DOI: 10.2352/issn.2470-1173.2021.7.iss-122

Zheng Lyu, Krithin Kripakaran, Max Furth, Eric Tang, B. Wandell, J. Farrell

引用次数: 3

A Proposal of Analog Correlated Multiple Sampling with High Density Capacitors for Low Noise CMOS Image Sensors 一种用于低噪声CMOS图像传感器的高密度电容模拟相关多次采样方案

Imaging Sensors and Systems Pub Date : 2021-01-18 DOI: 10.2352/issn.2470-1173.2021.7.iss-092

Shunta Kamoshita, Manabu Suzuki, R. Kuroda, S. Sugawa

引用次数: 0

An Ultra-Low-Cost Large-Format Wireless IoT Camera 超低成本大画幅无线物联网摄像头

Imaging Sensors and Systems Pub Date : 2021-01-18 DOI: 10.2352/issn.2470-1173.2021.7.iss-070

H. Dietz, P. Eberhart

引用次数: 2

A 4-tap global shutter pixel with enhanced IR sensitivity for VGA time-of-flight CMOS image sensors 具有增强红外灵敏度的VGA飞行时间CMOS图像传感器的4分频全局快门像素

Imaging Sensors and Systems Pub Date : 2020-01-26 DOI: 10.2352/issn.2470-1173.2020.7.iss-103

T. Jung, Yonghun Kwon, Sung-Uk Seo, Min-Sun Keel, Changkeun Lee, Sungsoo Choi, Sae-Young Kim, Sunghyuck Cho, Youngchan Kim, Young-Gu Jin, Moosup Lim, H. Ryu, Yitae Kim, Joonseok Kim, Changrok Moon

引用次数: 7

Camera support for use of unchipped manual lenses 相机支持使用无芯片手动镜头

Imaging Sensors and Systems Pub Date : 2020-01-26 DOI: 10.2352/issn.2470-1173.2020.7.iss-327

H. Dietz

引用次数: 1

CIS Band Noise Prediction Methodology Using Co-Simulation of Camera Module 基于相机模块联合仿真的CIS波段噪声预测方法

Imaging Sensors and Systems Pub Date : 2020-01-26 DOI: 10.2352/issn.2470-1173.2020.7.iss-328

Euncheol Lee, Hyunsu Jun, Wonho Wilson Choi, Kihyun Kwon, J. Lim, Seung-hak Lee, J. Yim

引用次数: 0

An Over 120dB Dynamic Range Linear Response Single Exposure CMOS Image Sensor with Two-stage Lateral Overflow Integration Trench Capacitors 具有两级横向溢流集成沟槽电容的超过120dB动态范围线性响应单曝光CMOS图像传感器

Imaging Sensors and Systems Pub Date : 2020-01-26 DOI: 10.2352/issn.2470-1173.2020.7.iss-143

Y. Fujihara, M. Murata, Shota Nakayama, R. Kuroda, S. Sugawa

引用次数: 3