资源描述：
《VisionSubjectiveandObjectiveIssues-DrexelUniversity视觉的主观和客观的问题-卓克索大学》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、Vision:SubjectiveandObjectiveIssuesOlehTretiakMedicalImagingSystems2002WhyStudyVisionUnderstandhowtodisplayimagesUnderstandwhatisseenUnderstandhowvisionworksSourcesofInformationPhysicsofvisionNeurophysiologyofvisionPsychologyofvisionPsychophysicsRefe
2、rencesDavidHubel,Eye,Brain,andVision,HenryHold&Company,1995JamesP.C.Southall,PhysiologicalOptics,Dover,1961VickiBruce,PatrickR.Green,MarkA.Georgeson,VisualPerception:Physiology,Psychology,andEcology,PsychologyPress,1996VisualPathway-AnatomyVisualPath
3、way-SymbolicTheRetinaandtheEyeTheEyeballVisionandEyeFixation(motion)Half-retinamapsLayersoftheGeniculateNucleusSectionthroughStriateCortexMapFromRetinatoStriateCortexStriateCortexInput/OutputIndexofrefractionCornea(n2)1.376Aqueoushumorandvitreousbody
4、(n3=n7)1.336Outerportionoflens(n4=n6)1.386Core-lens(n5)1.406ThemodelisduetoGullstrand(1924).Thepoweroftheeyeinthismodelrangesfrom58.64dptr(diopters)to70.57dptr.Mostoftherefraction(43dptr)isduetothecornea.SubjectiveIntensity(Contrast)ModelsInamodelfor
5、subjectiveintensity,letxbythebrightness(power/area)andythesubjectivebrightness(contrast).Bothxandyrangefrom0to100.Logarithmicmodel:Powerlawmodel:Onthenextslideweshowthirtyfourstepsdesignedtoproduceuniformcontrastwith(1)linear,powerlawwithgamma=1,(2)p
6、owerlaw,gamma=0.7,and(3)logarithmic.Notethattheappearanceofthisdependsonthetransferfunctionofthedisplay.SimultaneousContrastExamplesBackground=245,circles=210,225,and235Background=70,circle=60Thecircleshavethesameobjectiveintensity.‘Typical’VisualSpa
7、tialResponseObjectivevalue(intensity)Subjective(perceived)valueMachBands‘Typical’visualtemporalresponseBoundariesBrightnessTextureShapePerceptionSizePerception
