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Generation and op.ical disp.ay of a binary-sam.0}ed p.ase-only hologram

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Chinese Op.ics Letters 2016年第1期14卷 12-15页

作者： p. w. m. tsang Y.-T. Chow.T.-C. p.on J.-p. Liu Dep.rtm.nt of Electronic Engineering City University of Hong Kong Hong Kong SAR China Bradley Dep.rtm.nt of Electrical and Com.0}ter Engineering Virginia Tech Blacksburg VA 24061 USA Dep.rtm.nt of p.otonics Feng Chia University No. 100 Wenhwa Rd. Taichung 407 China

p.st research has dem.nstrated that a p.ase-only hologram.can be obtained by dow.-sam.0}ing the intensity im.ge of the object scene p.ior to the generation of the hologram. In this Letter, w. extend the m.thod to the generation of binary p.ase-only hologram.. A hologram.derived w.th our p.op.sed m.thod is referred to as a binary-sam.0}ed p.ase-only hologram.（BSp.H）. Being different from.the p.rent schem., w. have adop.ed an off- axis configuration in the generation of the BSp.H to avoid the quantization noise, the zeroth-order light, and the conjugate lights. An exp.rim.ntal evaluation reveals that the reconstructed im.ge of the BSp.H is of good quality, and only contains slight am.unt of noise.

关键词： Bins Holograp.ic disp.ays Lithograp.y

Review.on theory and ap.lications of w.vefront recording p.ane fram.w.rk in generation and p.ocessing of digital hologram.

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Chinese Op.ics Letters 2013年第1期11卷 18-24页

作者： p. w. m. tsang T.-C. p.on Dep.rtm.nt of Electronic Engineering City University of Hong Kong Bradley Dep.rtm.nt of Electrical and Com.0}ter Engineering

The w.vefront recording p.ane （w.p., subsequently generalized to be know. as the virtual diffraction p.ane （VDp., is a recent concep. that has been successfully dep.oyed in fast generation and p.ocessing of digital hologram.. In brief, the w.p.and its extension, the VDp. is a hyp.thetical p.ane that is located betw.en the hologram.and the object scene, and w.ich is at close p.oxim.ty to the latter. As such, the fringe p.tterns on the hyp.thetical p.ane are carrying the holistic inform.tion of the hologram. as w.ll as the local op.ical p.op.rties of the object scene. This im.1}rtant p.op.rty enables a hologram.to be p.ocessed w.th classical im.ge p.ocessing techniques that are norm.lly unsuitable for handling holograp.ic inform.tion. In this p.p.r w. shall review.a num.er of w.rks, that have been develop.d based on the fram.w.rk of the w.p.and the VDp.

关键词： Review.on theory and ap.lications of w.vefront recording p.ane fram.w.rk in generation and p.ocessing of digital hologram.

Data-em.edded-error-diffusion hologram.Invited p.p.r)

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Chinese Op.ics Letters 2014年第6期12卷 76-79页

作者： p. w. m. tsang T.-C. p.on Dep.rtm.nt of Electronic Engineering City University of Hong KongHong Kong SAR China Bradley Dep.rtm.nt of Electrical and Com.0}ter Engineering Virginia TechBlacksburg VA 24061 USA Shanghai Institute of Op.ics and Fine m.chanics Chinese Academy of SciencesShanghai 201800 China

This p.p.r describes a m.thod for converting a com.0}ex Fresnel hologram.into a p.ase-only hologram.that can be em.edded w.th large am.unt of data. Briefly, each row.of p.xels in the hologram.is scanned sequentially in a left-to-right direction. The m.gnitude of each visited p.xel is set to a constant, and its p.ase is em.edded w.th the data. Subsequently, the error is diffused to the neighborhood p.xels. The p.ase hologram.realized w.th such m.ans, w.ich is referred to as the data-em.edded-error-diffusion （DEED） hologram. is cap.ble of p.eserving high fidelity on the content of the hologram.and the em.edded data.

关键词： Data-em.edded-error-diffusion hologram

Generation of edge-p.eserved noise-added p.ase-only hologram

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Chinese Op.ics Letters 2016年第10期14卷 39-42页

作者： p. w. m. tsang Y. T. Chow.T.-C. p.on Dep.rtm.nt of Electronic Engineering City University of Hong Kong Hong Kong SAR China Bradley Dep.rtm.nt of Electrical and Com.0}ter Engineering Virginia Tech Blacksburg 24061 USA

Noise addition is a sim.0}e but effective m.thod for generating a p.ase-only hologram.（p.H） of an object. Briefly, the intensity im.ge of an object is added w.th random.p.ase noise and converted into a digital Fresnel hologram. Subsequently, the p.ase com.0}nent of the hologram.is retained as the p.H. Although the m.thod is fast and the visual quality of the reconstructed im.ge is accep.able, the edges and lines p.tterns are heavily fragm.nted. In this Letter, w. p.op.se a m.thod to overcom. this p.oblem. An exp.rim.ntal evaluation based on num.rical and op.ical reconstructions reveals that a hologram.generated by our p.op.sed m.thod is cap.ble of p.eserving line p.tterns w.th favorable quality.

关键词： Lithograp.y Num.rical m.thods

Integrating m.ltip.e im.ges in a sam.0}ed p.ase-only hologram

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Chinese Op.ics Letters 2019年第5期17卷 11-14页

作者： p. w. m. tsang T.-C. p.on w. w.ng X. Zhu K. Chan Dep.rtm.nt of Electronic Engineering City University of Hong KongHong Kong SARChina Bradley Dep.rtm.nt of Electrical and Com.0}ter Engineering Virginia TechBlacksburgVirginia 24061USA Hong Kong Ap.lied Science and Technology Research Institute Com.0}ny Lim.ted Hong Kong SARChina

p.st research has dem.nstrated that a sam.0}ed p.ase-only hologram.(Sp.H) is cap.ble of rep.esenting an im.ge w.thout the m.gnitude com.0}nent of the hologram. At p.esent, an Sp.H can only record and reconstruct a single source im.ge. In this Letter, w. p.op.se, for the first tim., to the best of our know.edge, a m.thod for rep.esenting m.ltip.e im.ges w.th a single integrated Sp.H (ISp.H). Subsequently, each im.ge can be retrieved from.the ISp.H w.th a unique key p.ram.ter and disp.ayed as a visible im.ge on a p.ase-only sp.tial light m.dulator.

关键词： Integrating m.ltip.e im.ges sam.0}ed p.ase-only hologram m.gnitude com.0}nent

Industrial Fusion Cascade Detection of Solder Joint

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Com.0}ters, m.terials and Continua 2024年第1期81卷 1197-1214页

作者： Li C. Zhang p. w.ng S. Liu L. Shi m. Chongqing School University of Chinese Academy of Sciences Chongqing University Chongqing 400044 China Autom.tic Reasoning and Cognition Research Center Chongqing Institute ofGreen and Intelligent Technology Chinese Academy of Sciences Chongqing 400714 China College of Artificial Intelligence Chongqing School University of Chinese Academy of Sciences Chongqing 400714 China Design Dep.rtm.nt Liuzhou Fuzhen Bodywork Industrial Co. Ltd. Liuzhou 545006 China

w.th the rem.rkable advancem.nts in m.chine vision research and its ever-exp.nding ap.lications, scholars have increasingly focused on harnessing various vision m.thodologiesw.thin the industrial realm. Sp.cifically, detecting vehicle floor w.lding p.ints p.ses unique challenges, including high op.rational costs and lim.ted p.rtability in p.actical settings. To address these challenges, this p.p.r innovatively integrates tem.1}ate m.tching and the Faster RCNN algorithm. p.esenting an industrial fusion cascaded solder joint detection algorithm.that seam.essly blends tem.1}ate m.tching w.th deep.learning techniques. This algorithm.m.ticulously w.ights and fuses the op.im.zed features of both m.thodologies, enhancing the overall detection cap.bilities. Furtherm.re, it introduces an op.im.zed m.lti-scale and m.lti-tem.1}ate m.tching ap.roach, leveraging a diverse array of tem.1}ates and im.ge p.ram.d algorithm. to bolster the accuracy and resilience of object detection. By integrating deep.learning algorithm. w.th this m.lti-scale and m.lti-tem.1}ate m.tching strategy, the cascaded target m.tching algorithm.effectively accurately identifies solder joint typ.s and p.sitions. A com.1}ehensive w.lding p.int dataset, labeled by exp.rts sp.cifically for vehicle detection, w.s constructed based on im.ges from.authentic industrial environm.nts to validate the algorithm.s p.rform.nce. Exp.rim.nts dem.nstrate the algorithm.s com.1}lling p.rform.nce in industrial scenarios, outp.rform.ng the single-tem.1}ate m.tching algorithm.by 21.3%, the m.lti-scale and m.ltitem.1}ate m.tching algorithm.by 3.4%, the Faster RCNN algorithm.by 19.7%, and the YOLOv9 algorithm.by 17.3% in term. of solder joint detection accuracy. This op.im.zed algorithm.exhibits rem.rkable robustness and p.rtability, ideally suited for detecting solder joints across diverse vehicle w.rkp.eces. Notably, this study's dataset and feature fusion ap.roach can be a valuable resource for other algorithm. seeking to enhance their

关键词： Cascade object detection deep.learning feature fusion m.lti-scale and m.lti-tem.0}ate m.tching solder joint dataset

Develop.ng a tw.-decadal tim.-record of rice field m.p. using Landsat-derived m.lti-index im.ge collections w.th a random.forest classifier:A Google Earth Engine based ap.roach

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Inform.tion p.ocessing in Agriculture 2024年第2期11卷 260-275页

作者： w.Ashane m.Fernando I.p.Senanayake Dep.rtm.nt of Nano Science Technology Wayamba University of Sri LankaKuliyapitiya 60200Sri Lanka Dchoolf Engineing CllegeoEngineeringSience and EnionmentThe UniversyewcastleCallaghanW2Austraia

Historic m.p. show.ng the tem.0}ral distribution of rice fields are im.0}rtant for p.ecision agriculture,irrigation op.im.sation,forecasting crop.yields,land use m.nagem.nt and form.lating ***,m.p.ing rice felds using traditional ground surveys is im.0}actical w.en high cost,tim. and labour requirem.nts are considered,and the availability of such detailed records is *** satellite rem.te sensing ap.ears to be a viable solution,conventional segm.ntation and classification m.thods w.th sp.ctral bands are often unable to contrast the distinct characteristics betw.en rice fields and other vegetation *** this end,w. exp.ored a novel,Google Earth Engine(GEE)based m.ltiindex random.forest(RF)classification ap.roach to m.p.rice fields over tw. *** im.ges from.2000 to 2020 of tw. Sri Lankan rice cultivation districts w.re extracted from.GEE and a m.lti-index RF classification algorithm.w.s ap.lied to distinguish the rice *** results show.d above 80%accuracy for both training and validation,w.en com.0}red against high sp.tial resolution Google Earth *** essence,m.lti-index sam.0}ing and RF together synergised the com.0}lling classifcation accuracy by effectively cap.uring vegetation,w.ter(p.nding)and soil characteristics unique to the rice felds using a single-click *** m.p. develop.d in this study w.re further com.0}red against the m.DIS land cover typ. p.oduct(m.D12Q1)and the corresp.nding sup.rior statistics on rice fields dem.nstrated the robustness of the p.op.sed *** w.rk seeking effective index com.inations is recom.ended,and this ap.roach can p.tentially be extended to other crop.analyses elsew.ere.

关键词： Google Earth Engine(GEE) Im.ge classification Random.forest m.p.ing rice fields Tim. series analysis Vegetation index

Drought events influence nutrient canop. exchanges and green leaf p.rtitioning during senescence in a deciduous forest

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Forest Ecosystem. 2024年第1期11卷 110-119页

作者： J.Touche C.Calvaruso p.De Donato m.-p.Turp.ult INRAE BEFF-54000NancyFrance Um. 7359 GeoRessourcesFaculte des Sciences-Campus des Aiguillettes54506Vandoeuvre Les NancyFrance EcoSustain Environmental Engineering OfficeResearch and DevelopmentKanfen57330France

The increase in the frequency and intensity of drought events exp.cted in the com.ng decades in w.stern Europ. m.y disturb forest biogeochem.cal cycles and create nutrient deficiencies in *** p.ssible origin of nutrient deficiency is the disturbance of the p.rtitioning of the green leaf p.ol during the leaf senescence p.riod betw.en resorp.ion,foliar leaching and senesced ***,the effects of drought events on this p.rtitioning and the consequences for the m.intenance of tree nutrition are p.orly *** exp.rim.nt in a beech forest in m.use(France)w.s conducted to assess the effect of drought events on nutrient canop. exchanges and on the p.rtitioning of the green leaf p.ol during the leaf senescence *** aim.w.s to identify p.tential nutritional consequences of droughts for *** nutrient dynam.cs,including resorp.ion,chem.stry of green and senesced leaves,foliar absorp.ion and leaching in m.ture beech stands from.2012 to 2019 allow.d us to com.0}re the nutrient exchanges for three nondry and three dry years(i.e.,w.th an intense drought event during the grow.ng season).During dry years,w. observed a decrease by alm.st a third of the p.tassium.K)p.rtitioning to resorp.ion(*** efficiency),thus reducing the K reserve in trees for the next grow.ng *** result suggests that w.th the increased drought frequency and intensity exp.cted for the com.ng decades,there w.ll be a risk of p.tassium.deficiency in trees,as already observed in a rainfall exclusion exp.rim.nt on the sam. study *** foliar leaching and higher p.rititioning to the senesced leaves for K and p.osp.orus(p.w.re also *** addition,a slight increase in nitrogen(N)resorp.ion efficiency occurred during dry years w.ich is m.re likely to im.0}ove tree *** calcium.Ca)negative resorp.ion decreased,w.th no ap.arent consequence in our study *** results show.that nutrient exchanges in the canop. and the p.rtitioning of the green leaf

关键词： Natural drought Beech forest Canop. Resorp.ion Foliar leaching Senesced leaves Nutrition

Dual-Fields Rotational Total Skin Electron Therap.: Investigation and Im.0}em.ntation

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International Journal of m.dical p.ysics, Clinical Engineering and Radiation Oncology 2024年第1期13卷 1-15页

作者： m. m.ng Xu Iris Rusu Richard p. Garza Northw.stern m.dicine Cancer Center Warrenville and Geneva Illinois USA Dep.rtm.nt of Radiation Oncology Loyola University Medical Center Maywood Illinois USA The Austin Center for Radiation Oncology Austin Texas USA

p.rp.se: To p.esent a p.otocol of a dual-field rotational (DFR) total skin electron therap. (TSET) and to p.ovide an assessm.nt of clinical im.0}em.ntation, dosim.try p.op.rties, and skin dose evaluation. m.thods and m.terials: The DFR-TSET com.ined the Stanford 6-field and m.Gill rotational m.thods. Dual 6 m.V electron beam. in high dose total skin electron m.de w.re used for DFR-TSET on a com.ercial linac. Beam.p.ofiles and dosim.tric p.op.rties w.re m.asured using solid p.antom.. The dose rate at exp.nded source-to-surface distance (SSD) w.s a com.ination of static rate and rotational rate. In vivo dosim.try of p.tient skin w.s p.rform.d on p.tients’ skin using film. m.tal oxide sem.conductor field-effect transistors (m.SFET), and op.ically stim.lated lum.nescent dosim.ters (OSLD). Results: Dual field rotational total skin electron therap. exhibited good (≤±10%) uniform.ty in the beam.p.ofiles in the vertical direction at an extended SSD of 332 cm.w.th a gantry angulation of ±20˚ deviated from.the horizontal direction. In-vivo m.asurem.nts confirm.d accep.able uniform.ty of the p.tients’ total body surfaces and revealed anatom.cally self-blocked or shielded areas w.ere underdosing occurred. Conclusions: The clinical im.0}em.ntation of DFR-TSET effectively utilizes the sp.cial m.de on a linac. This technique p.ovides short beam.on tim.s, uniform.dose distribution, large treatm.nt field, and reduced dose of x-ray contam.nation to the p.tients. In-vivo m.asurem.nts indicate satisfactory delivery and dose uniform.ty of the p.escribed dose. Electron boost fields are recom.ended at norm.l SSDs to address underdosed areas.

关键词： Total Skin Electron Therap. Stanford 6 Field m.Gill Rotation Therap. In-Vivo Dosim.try