Optical Review最新文献_第5页

Improvement in image gaps and viewing angle of space-saving compact aerial display 改进节省空间的紧凑型航空显示器的图像间隙和视角

IF 1.1 4区物理与天体物理

Optical Review Pub Date : 2024-11-15 DOI: 10.1007/s10043-024-00928-x

Daichi Tasaki, Akinori Tsuji, Toyotaro Tokimoto, Shiro Suyama, Hirotsugu Yamamoto

引用次数: 0

Hybrid network with difficult–easy learning for concealed object detection in imbalanced terahertz image dataset 在不平衡太赫兹图像数据集中利用难易学习混合网络进行隐蔽物体检测

IF 1.1 4区物理与天体物理

Optical Review Pub Date : 2024-11-14 DOI: 10.1007/s10043-024-00927-y

Pengfei Yang, Shaojuan Luo, Meiyun Chen, Genping Zhao, Heng Wu, Chunhua He

{"title":"Hybrid network with difficult–easy learning for concealed object detection in imbalanced terahertz image dataset","authors":"Pengfei Yang, Shaojuan Luo, Meiyun Chen, Genping Zhao, Heng Wu, Chunhua He","doi":"10.1007/s10043-024-00927-y","DOIUrl":"10.1007/s10043-024-00927-y","url":null,"abstract":"<div><p>Terahertz imaging technology has been widely used in security inspections due to its ability to detect various concealed hazardous materials and the advantage of being harmless to the human body. However, limited by the terahertz imaging system, it is challenging to detect concealed objects due to hard samples and imbalanced categories caused by terahertz image quality. To solve these issues, we propose a hybrid network with difficult–easy learning (DEL) for concealed object detection in the imbalanced activated terahertz image dataset. Based on the one-stage framework YOLOv5m, a path aggregation hybrid structure (PAHS) is proposed to improve the performance of the proposed network while maintaining real-time detection. Specifically, PAHS with transformer block (TB) and a fine-tuned global context attention (GCA) are designed to fully exploit and fuse the multi-scale information by path aggregation, which improves the detection accuracy of low contrast and noise-interfered objects. To solve the problem of imbalanced categories in the activated terahertz dataset, a DELoss is developed to guide the network classification. Moreover, EIOU is adopted to boost the network training, and a modified B-Ocl loss is used to discriminate the positive and negative samples. Experiments are conducted on a public imbalanced activate terahertz image dataset. The experimental results illustrate that the proposed network achieves competitive performance compared with recently reported state-of-the-art detection methods. Moreover, the proposed method improves the balanced detection ability of different categories.</p></div>","PeriodicalId":722,"journal":{"name":"Optical Review","volume":"31 Japan","pages":"702 - 718"},"PeriodicalIF":1.1,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142637896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Age-based effects of yellow lenses on discomfort glare from white LED headlights 基于年龄的黄色镜片对白色 LED 大灯产生的不适眩光的影响

IF 1.1 4区物理与天体物理

Optical Review Pub Date : 2024-11-08 DOI: 10.1007/s10043-024-00926-z

Tatsuya Iizuka, Takushi Kawamorita, Hitoshi Ishikawa

{"title":"Age-based effects of yellow lenses on discomfort glare from white LED headlights","authors":"Tatsuya Iizuka, Takushi Kawamorita, Hitoshi Ishikawa","doi":"10.1007/s10043-024-00926-z","DOIUrl":"10.1007/s10043-024-00926-z","url":null,"abstract":"<div><p>This study aimed to explore the effectiveness of yellow glasses in reducing discomfort glare caused by white light-emitting diode headlights during night-time driving. The 30 visually normal participants were categorized into two age groups: 15 younger adults (mean age = 21.0 ± 1.6 years) and 15 older adults (mean age = 71.0 ± 1.6 years). Participants, simulating a driving position, assessed discomfort glare from glare sources (high- and low-beam headlights of oncoming vehicles) located 40 m away using the de Boer scale. Yellow glasses meeting night driving standards were found to have no significant impact on discomfort glare compared to neutral density filters with identical luminous transmittance, across all age groups. These findings imply that the ability of yellow glasses to partially block blue light, prevalent in white light-emitting diode headlights, does not alleviate discomfort glare. In conclusion, yellow glasses with a luminous transmittance of 75% or higher, meeting night driving standards, do not reduce discomfort glare caused by white LED headlights, regardless of the age group of the driver.</p></div>","PeriodicalId":722,"journal":{"name":"Optical Review","volume":"31 Japan","pages":"626 - 632"},"PeriodicalIF":1.1,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142597779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improved ternary composite ceramic phosphors for warm-white laser lighting 用于暖白激光照明的改进型三元复合陶瓷荧光粉

IF 1.1 4区物理与天体物理

Optical Review Pub Date : 2024-11-08 DOI: 10.1007/s10043-024-00925-0

Hisashi Minemoto, Kana Fujioka, Hiroshi Fuji, Kazuhisa Yamamoto, Tsuneo Kusunoki, Seika Tokumitsu, Hideo Kawabe

{"title":"Improved ternary composite ceramic phosphors for warm-white laser lighting","authors":"Hisashi Minemoto, Kana Fujioka, Hiroshi Fuji, Kazuhisa Yamamoto, Tsuneo Kusunoki, Seika Tokumitsu, Hideo Kawabe","doi":"10.1007/s10043-024-00925-0","DOIUrl":"10.1007/s10043-024-00925-0","url":null,"abstract":"<div><p>The large thermal conductivity of phosphor materials is crucial for laser lighting. Since the laser beam for pumping is focused on a small spot size (usually less than 1 mm<sup>2</sup>), heat generation is unavoidable at this point. Composite ceramic phosphors for cool-white laser lighting, the correlated color temperature of which is around 5000 K, produced by mixing of yellow photoluminescent light from Y<sub>3</sub>A<sub>5</sub>O<sub>12</sub>:Ce (YAG:Ce) with unutilized pumping blue light, were well studied. However, composite ceramic phosphors for warm-white around 3000 K are not as researched; this is because the difficulties in sintering nitride phosphors which are useful as red or orange phosphors. We have proposed improved ternary composite ceramic phosphors for warm-white laser lighting. The ceramic phosphors utilize a red phosphor: ((Ba,Sr)<sub>2</sub>Si<sub>5</sub>N<sub>8</sub>:Eu), a yellow phosphor: (YAG:Ce), and a thermal conducting matrix: (Al<sub>2</sub>O<sub>3</sub>). There are two types of composite ceramics: Type A with higher emission efficiency, and Type B more effective for warm light. These composite ceramic phosphors have higher saturation input laser power than our previous one, in which Sr<sub>2</sub>Si<sub>5</sub>N<sub>8</sub> was utilized as a red phosphor. The improved ceramic phosphors (Type A) do not have a saturation peak of at least up to 16 W (power density:20 W/mm<sup>2</sup>) pumping laser power, but our previous one had a saturation peak at 6 W (power density:7.6 W/mm<sup>2</sup>). We recently got a good sample, the correlated color temperature of which is 3422 K, output efficiency is 177 lm/W, and general color rendering index (Ra) is 65. The improved ternary composite ceramic phosphors are extremely useful for warm-white laser lighting.</p></div>","PeriodicalId":722,"journal":{"name":"Optical Review","volume":"31 Japan","pages":"740 - 746"},"PeriodicalIF":1.1,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142597780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of sensory tests for visibility of blur-added and color-changed virtual characters for AR display 对 AR 显示器中添加模糊和改变颜色的虚拟字符可见度的感官测试分析

IF 1.1 4区物理与天体物理

Optical Review Pub Date : 2024-10-28 DOI: 10.1007/s10043-024-00923-2

Yuta Machigashira, Haruki Mizushina, Kenji Yamamoto

引用次数: 0

Effects of three wavelength-cut lenses on visual function in the photopic and mesopic conditions 三种波长切割镜片对近视和中近视条件下视觉功能的影响

IF 1.1 4区物理与天体物理

Optical Review Pub Date : 2024-10-23 DOI: 10.1007/s10043-024-00924-1

Tatsuya Iizuka, Tomoya Handa

{"title":"Effects of three wavelength-cut lenses on visual function in the photopic and mesopic conditions","authors":"Tatsuya Iizuka, Tomoya Handa","doi":"10.1007/s10043-024-00924-1","DOIUrl":"10.1007/s10043-024-00924-1","url":null,"abstract":"<div><p>This study aimed to explore the impact of three wavelength-cut (TWC) lenses, which allowed 75% luminance transmittance while blocking wavelengths < 420 nm, approximately 460 nm, and approximately 585 nm, on visual function and color perception, and aging interaction effect. This single-center study enrolled 30 participants into two groups including 15 young participants (age 21.4 ± 1.3 years) and 15 older participants (age 71.7 ± 1.7 years). We used TWC lenses and a neutral density (ND) filter to assess the wavelength-cut effects on visual acuity, contrast sensitivity, and cone contrast sensitivity. Visual acuity and contrast sensitivity were assessed under photopic (luminance 85–100 cd/m<sup>2</sup>) and mesopic conditions (luminance 0.8 cd/m<sup>2</sup>). Significant interactions between age and lens conditions were observed for contrast sensitivity under photopic conditions (Bonferroni corrected α = 0.025, F<sub>(1,28)</sub> = 7.98, P = 0.01, η<sup>2</sup> = 0.003), suggesting that contrast sensitivity to white and black gratings is better with TWC lenses (75%) than with the ND filter in young participants (F<sub>(1,28)</sub> = 7.25, P = 0.01, η<sup>2</sup> = 0.206). However, the lens condition did not affect visual acuity and had only a minimal effect on cone contrast sensitivity for each cone type. In conclusion, TWC lenses, despite their nearly colorless and transparent appearance, can selectively block specific wavelengths to improve contrast sensitivity, while minimally affecting color perception. However, since the effect size of these interactions is very small, the impact is limited, therefore glasses should be prescribed with caution for young individuals.</p></div>","PeriodicalId":722,"journal":{"name":"Optical Review","volume":"31 Japan","pages":"694 - 701"},"PeriodicalIF":1.1,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142488514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Skew information and non-classical properties for semi squeezed states 半挤压态的偏斜信息和非经典特性

IF 1.1 4区物理与天体物理

Optical Review Pub Date : 2024-10-22 DOI: 10.1007/s10043-024-00918-z

A.-S. F. Obada, M. M. A. Ahmed, E. M. Khalil, S. Sanad

引用次数: 0

Mask-based lensless face recognition system with dual-prior face restoration 基于面具的无镜头人脸识别系统与双前置人脸修复功能

IF 1.1 4区物理与天体物理

Optical Review Pub Date : 2024-10-20 DOI: 10.1007/s10043-024-00915-2

Yeru Wang, Guowei Zhang, Xiyuan Jia, Yan Li, Qiuhua Wang, Zhen Zhang, Lifeng Yuan, Guohua Wu

{"title":"Mask-based lensless face recognition system with dual-prior face restoration","authors":"Yeru Wang, Guowei Zhang, Xiyuan Jia, Yan Li, Qiuhua Wang, Zhen Zhang, Lifeng Yuan, Guohua Wu","doi":"10.1007/s10043-024-00915-2","DOIUrl":"10.1007/s10043-024-00915-2","url":null,"abstract":"<div><p>Face recognition, a biometric technology that analyzes facial features to authenticate individuals’ identities, has various applications and implications across different fields. However, the advancement of technologies such as the Internet of Things has posed challenges for face recognition systems in terms of size, weight, cost, and privacy issues. In response to these challenges, some scholars have suggested a mask-based lensless face recognition system that captures facial images through a mask, eliminating the need for lenses. Nevertheless, the performance of lensless face recognition systems is limited by mask-based imaging, resulting in suboptimal results. To address this limitation, we propose a novel mask-based lensless face recognition system based on the Dual-Prior Face Restoration (DPFR) model. This model utilizes a dual-prior generator to create distinct facial priors that aid the Generative Adversarial Network (GAN) blocks in reconstructing both the global face structure and local face details. Extensive experiments have been carried out on the FlatCam Face Dataset (FCFD) captured using a lens camera and Flatcam lensless camera. The enhanced accuracy, precision, and True Accept Rate (TAR) performance metrics validate the effectiveness of the proposed mask-based lensless face recognition system.</p></div>","PeriodicalId":722,"journal":{"name":"Optical Review","volume":"31 Japan","pages":"633 - 643"},"PeriodicalIF":1.1,"publicationDate":"2024-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142451427","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Imaging distance of an aquatic image formed by an aquatic display obtained by paraxial approximation 通过旁轴近似法获得的由水生显示器形成的水生图像的成像距离

IF 1.1 4区物理与天体物理

Optical Review Pub Date : 2024-10-14 DOI: 10.1007/s10043-024-00916-1

Ryosuke Ichikawa, Hiroki Takatsuka, Toru Iwane, Shiro Suyama, Hirotsugu Yamamoto

引用次数: 0

Ai-enabled efficient modulation classification in underwater OWC systems 水下 OWC 系统中由人工智能支持的高效调制分类

IF 1.1 4区物理与天体物理

Optical Review Pub Date : 2024-10-14 DOI: 10.1007/s10043-024-00922-3

Qingwen He, Zhihong Zeng, Min Liu, Binbin Zhu, Bangjiang Lin, Chen Chen

{"title":"Ai-enabled efficient modulation classification in underwater OWC systems","authors":"Qingwen He, Zhihong Zeng, Min Liu, Binbin Zhu, Bangjiang Lin, Chen Chen","doi":"10.1007/s10043-024-00922-3","DOIUrl":"10.1007/s10043-024-00922-3","url":null,"abstract":"<div><p>In this paper, we propose and experimentally demonstrate an artificial intelligence (AI)-enabled efficient modulation classification technique for underwater optical wireless communication (UOWC) systems. Specifically, time-domain waveform histograms are adopted as classification features, where three modulation formats including direct current biased optical orthogonal frequency division multiplexing (DCO-OFDM), asymmetrically clipped optical OFDM (ACO-OFDM) and pulse amplitude modulation (PAM) are considered. Moreover, AI algorithms such as decision trees (DT), k-nearest neighbors (k-NN), support vector machines (SVM) and convolutional neural networks (CNN) are utilized to realize efficient modulation classification based on the obtained waveform histogram features. Experimental results demonstrate that all the four algorithms can achieve accuracy surpassing 95% when the received signal-to-noise ratio (SNR) exceeds 6.3 dB. Furthermore, increasing the number of symbols in histograms enhances classification accuracy, whereas altering the number of histogram bins has minimal impact on classification accuracy.</p></div>","PeriodicalId":722,"journal":{"name":"Optical Review","volume":"31 Japan","pages":"688 - 693"},"PeriodicalIF":1.1,"publicationDate":"2024-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142431456","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0