EEG Feature Extraction For Binocular Color Fusion And Rivalry In Stereoscopic Displays

When the left and right eyes are given different colors(e.g.red-green,blue-yellow)at the same time and the color gap is small,the human eye perceives a single color,a phenomenon known as binocular color fusion;when the color gap between the left and right eyes increases to a certain threshold,the brain perceives colors in a cyclical alternating pattern,known as binocular color rivalry.Binocular color fusion and rivalry reflect physiological changes in the brain’s visual perception of color and are a pointer to the brain’s consciousness and cognitive processes.The perception of binocular color fusion and rivalry in traditional psychophysical experiments has been judged primarily by subjective reports from subjects and lacks an objective basis.Since color fusion and rivalry may induce changes in the brain’s EEG signals,leading to significant differences in the components of the electroencephalogram(EEG),this thesis combines psychophysical experimental methods to design a binocular color fusion and binocular color rivalry-evoked EEG experiment.The experiment was conducted by selecting pairs of sample color dots of equal saturation but opposite hue in the iso-luminance plane of CIELAB color space as binocular stimuli,and using 128-channel EEG equipment to collect EEG event-related potential(ERP)data when the same color pair(yellow/blue)and different color pairs(red/green and yellow/blue)were given to the left and right eyes respectively.The experimental results showed that:(1)The latencies of ERP components N1 and P2 evoked by binocular color fusion stimulation under the same contrasting colors were significantly shorter(20-30ms)and the amplitude of N1 increased(0.65-0.9μV);the latencies of ERP components N2 and P3 evoked by binocular color rivalry were shorter(15-25ms)and the amplitude increased(0.9-1.6μV).There was a significant difference in the amplitude of the ERP waveforms evoked by binocular color fusion and binocular color rivalry during the same time period,indicating that the EEG signals evoked by binocular color fusion and binocular color rivalry in the same color pair(yellow/blue)were different.Compared to binocular color rivalry stimuli,the brain was more active in neurotransmitters and evoked higher cortical activity when receiving binocular color fusion stimuli.(2)The P3 component of the binocular color fusion stimulus was evoked with greater amplitude(0.35-1.72 μV)and longer latency(9-30 ms)in the frontal region compared to the yellow/blue counterpart,but the opposite was true in the parietal and occipital regions,indicating that the binocular color fusion stimulus was more likely to evoke deeper cortical activity in the yellow/blue counterpart.However,ANOVA of the EEG data for yellow/blue contrasting colors and red/green contrasting colors revealed no significant difference,suggesting that the mechanisms of binocular color processing should be the same for yellow/blue contrasting colors and red/green contrasting colors.In order to provide an objective pointer to the use of EEG to judge binocular color fusion and binocular color competition,this paper investigates the analysis and extraction of EEG signals for binocular color fusion and competition in a stereoscopic display,thus providing a basis for exploring the mechanism of binocular color visual processing in the brain and the application and promotion of binocular stereoscopic display technology.