Investigation On Human Visual Perception Features Based On 3D Display

80%of the information received from the outside world in our daily life is obtained through the visual system.With the rapid development of information technology,people depend more and more on transmission of the image information.3D display technology can not only provide the audience with a more realistic visual experience,but also needs to ensure the convenience and safety of the 3D viewing experience.There are various 3D applications in our real life,such as 3D remote surgery,3D maps.The research scope of 3D display is relatively wide,it involves 3D display device design and 3D content production.Much effort has been putto improve and optimize the 3D display performance,such as ultra-highresolution,large viewing angle,high-definition and so on.However,the final audience of 3D media is human,and the goal of 3D technology development goal is realistic reproduction of the real scene,therefore,the improvement of the 3D display performance should be based on the features of the human visual perception.The 3D technology could be truly accepted by the population only by following the physical and visual characteristics of the human eyesIn this thesis,we studied the visual perception features when watching 3D display,the main research contents and innovations are as follows:(1)Investigation on visual perception features based on 3D Display EnvironmentKey point 1:When viewing 3D content,the viewer is always in a specific viewing environment,including viewing distance,viewing angle,screen size,and indoor light settings.Visual stimulus parameters are also complex and various,such as color,brightness,3D content complexity and so on.In previous studies,the impact of these factors on stereoscopic perception is usually derived from the subjects' subjective feelings(such as filling questionnaires).Although this approach can reflect,to a certain extent,the impact of viewing environment settings on visual perception systems,but as psychologically or empirically individual differences exist,this might lead to some impact on the statistical results.In order to solve the problem,this thesis proposes a method to evaluate the influence of the external viewing environment and the visual stimulus parameter on the human visual system by using the vertical parallax fusion ability as the quantitative evaluation indicator,so as to provide references for the optimization of the 3D display environment configuration.Key point 2:In the past studies,the influence of vertical disparity on stereoscopic perception is too coarse and does not fully consider the influence of viewing environment on the vertical disparity fusion ability of human eye.Based on the key factors(luminance and retinal imaging size)that affect the perception of the human eye in the viewing environment identified in key point 1,we have done a modulation based on the data obtained under different condition of luminance and retinal imaging size.So that the predictions of vertical parallax fusion are closer to real situation,which makes the assessment of visual perception more targeted.(2)Study on the perceived threshold of depth information of multi-view glasses-free 3D displayKey point 3:In our daily life,the number of viewpoint received by the human eye is infinite.With the wearable 3D display,the human eye can only see two viewpoints.Whether this difference in the number of viewpoints will cause different threshold of the depth perception?In this paper,the multi-view glasses-free 3D display is used to compare the depth perception threshold at 2 views and 28 views.The effect of stimuli choice is also considered(contour stereogram and random dot stereogram).Key point 4:For the stereoscopic 3D display,the human eye is always focused on the screen,but the vergence function will change with the parallax,which is inconsistent with the fact that the focus and vergence are synchronized with the object in our real life.This conflict often leads to changes in the characteristics of the human visual system.In this thesis,we put the 3D object at the same depth position as the screen,and change the depth position of the background to create disparity between the object and background.This manipulation could reduce the effect of accommodation and vergence conflict.The depth perception threshold under this condition is measured to make comparison with normal 3D viewing condition.(3)Human visual motion-in-depth perceptionKey point 5:Three-dimensional information in our real life can be divided into two categories:one reflects the relative position between objects,which relies on static disparity,the other is the motion-in-depth direction of the moving objects in the space,which is caused by disparity changes over time.Previous studies have suggested that the mechanisms of neural and cognitive systems for static and dynamic stereoscopic information are not the same.Those who have normal static stereoscopic perception might not have the same ability to recognize dynamic stereoscopic motion.In this thesis,we first studied the ability of motion-in-depth perception of normal vision subjects without specific motion-in-depth visual experience,and through a series of perceptual training methods,the performance of the subjects of motion perception was significantly improved.So we can conclude that the experience of motion-in-depth perception plays an important role in the perception of dynamic random dot stereograms.Key point 6:The design of the 3D visual stimuli is critical for correct and comfortable visual perception.In this thesis,we investigated the visual stimuli parameters that could affect motion-in-depth perception.The significant parameters were extracted and the result of the study could provide useful references for the design of 3D visual stimuli in the future study.