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연구목표 (2010 년 ) 융합기술 기반 시감 측정시스템 구축 연구추진 계획 (2010 년 ). 계획. 완료. 진행중. 시감 자극 광원의 개발 : Color Vision Stimulator for EEG test. Sensitivity measurement of humane eye for primary color of LED display by heterochromatic flicker photometry

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  1. 연구목표 (2010년) • 융합기술 기반 시감 측정시스템 구축 • 연구추진 계획 (2010년) 계획 완료 진행중

  2. 시감 자극 광원의 개발 : Color Vision Stimulator for EEG test • Sensitivity measurement of humane eye for primary color of LED display by heterochromatic flicker photometry • An external TTL output for synchronizing the visual stimulator and EEG to induce the visual evoked potential • Adjustable observation field and flickering frequency • Two -fields bright matching tester for various colors

  3. 시감 자극 광원의 개발 : LED integrating sphere source for V() measurement Spectra of LED integrating sphere source • Quasi-monochromatic light source • FWHM : (5~40) nm • Visible wavelength range : (370~850) nm • Wide color gamut (84% of nature color) • Wide dynamic range of light output Luminous efficiency function V() Color Gamut of LED integrating sphere source

  4. 융합기술 기반 시감 측정시스템의구축 시자극 광원 시스템 Physics Flicker photometry Psychophysics EEG/MEG 시스템 electrophysiology 광도/색채 표준 Convergence Technology • mesopic vision은 서로 다른 종류의 광수용기가 활성화되는 시감 구간임. •  기존의 정신물리학적 방법만으로 규명하기 어려움. •  시감 자극/사람의 지각/생체신호를 동시에 측정하는 융합기술 기반 시감 측정시스템 필요

  5. 융합기술 기반 시감 측정시스템의구축 Vision Stimulator Spectroradiometer (color characterization of vision stimulator) color vision stimulator EEG measurement device LED IS light source Simultaneous collection of vision stimulation/perception signal/EEG signal

  6. 융합기술 기반 시감 측정시스템의구축 EEG measurement device (Poly G-A, Neuromedi) Color stimulator (KRISS) Spectroradiometer (CS-1000, Minolta) Software for simultaneous collection of vision stimulation / perception signal / EEG signal

  7. 융합기술 기반 시감 측정시스템의평가 • Evaluation method • heterochromatic flicker photometry (vision stimulation frequency : 16 Hz) • Viewing angle :10 • Color : Red, Green, Blue (primary color of 19 LCD monitor) • Stimulation variation : Red (VRed, VGreen, VBlue) = (0,0,0) ~ (80,0,0) • Green (VRed, VGreen, VBlue) = (0,0,0) ~ (0,80,0) • Blue (VRed, VGreen, VBlue) = (0,0,0) ~ (0,0,80) Spectrum of Color Primaries

  8. 융합기술 기반 시감 측정시스템의평가 • Steady-State Visual Evoked Potential (SSVEP) • Oscillatory EEG activity resulting from repetitive stimulation (flickering) • Neurons in human visual cortex synchronize their firing to the frequency of flickering light •  EEG responses with same (or multiples of) frequency as the flickering SSVEP measurement result for vision stimulation of 16 Hz color vision stimulator : Flickering mode (16 Hz) EEG measurement : bipolar method Oz (active electrode) Cz (reference electrode) Fpz (ground electrode)

  9. 융합기술 기반 시감 측정시스템의평가 Correlation of SSVEP with vision stimulation correlation coefficient : 0.983 correlation coefficient : 0.945 Recording time : 600 s Number of ensemble average : 58 correlation coefficient : 0.978

  10. 융합기술 기반 시감 측정시스템의평가 Color information when subjects distinguish test field from reference field <subject1 (Female, age: 25)> <subject2 (Male, age: 33)> Spectrum of color simulation when subjects distinguish test field from reference field

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