With the advent of three-dimensional stereoscopic display movies such as Avatar, three-dimensional stereoscopic display has received extensive attention. The free stereoscopic display system, as the best technology for realizing true three-dimensional display, plays an important role in the research of autostereoscopic display. In the display system, human factor analysis and autostereoscopic display image production analysis, in order to enable people to get a good three-dimensional stereoscopic feeling, a comprehensive human-computer interaction analysis was carried out. The observer can directly view the 3D stereoscopic image without wearing any observation device. That is, the free stereo display technology. The autostereoscopic display mainly includes holographic stereo technology, flat panel display, stereoscopic stereoscopic and stereoscopic projection technology, and the like. Among them, holographic stereo technology is the longest and most mature three-dimensional technology in research history, but it is difficult to make a full-color stereo image due to the dispersion problem of holographic image, while flat panel display and autostereoscopic display technology are limited by the existing technical conditions. It is difficult to achieve large screen display. Stereoscopic projections are implemented by holographic projection, Fresnel lens projection, and double cylindrical grating projection. Among them, the double cylindrical grating projection stereo projection system utilizes the mature large-screen projection technology, and can realize large-format full-color stereoscopic images relatively conveniently, and thus has received extensive attention.
2 Analysis of the parallax perception factors of people in autostereoscopic display2.1 Binocular rivalry
The so-called binocular competition refers to the perceptual change between the binocular stimuli that cannot be fused. Among them, the stimuli seen at a specific time are called stimuli; the stimuli that cannot be seen at a specific time are called stimuli. When the two stimuli are small, they will alternately see two complete images, which is an "all or nothing" advantage; when different parts of different modes dominate in different areas, the so-called mosaic advantage.
Figure 1 binocular competition
As shown in Figure 1, a closer observation reveals that one of the direct consequences of binocular competition is that the inhibitory stimulus is in the process of inhibition, and its characteristics almost completely disappear from the consciousness of consciousness. This is very dangerous in the system display. Therefore, it should be avoided to give the operator a disproportionate stimulus to the corresponding position of the omentum of both eyes to prevent the occurrence of binocular competition.
2.2 Pulfrich phenomenon
German physicist Carl Pulfrich pointed out in 1922 that when we placed a neutral density filter in front of one eye (not in front of the other eye) to observe the movement of the pendulum (or pendulum), we would see The pendulum seems to move in an elliptical orbit along the plane, which is the Pulfrich phenomenon (this pendulum is called the Platts pendulum). The direction of the pendulum movement depends on which eye of the person wears the filter, and the difference in brightness level between the eyes causes an illusion of depth in the motion scene. Gregory explained this depth illusion using the visual latency hypothesis. He believes that the attenuation of the stimulus in the filtered eye attenuates the visual response latency of the eye, so that the signal about the position of the object will cause a time deviation between the eyes when transmitted to the visual cortex, resulting in the illusion of motion in depth. According to this explanation, as long as there is a difference in brightness between the motion and the eyes, there may be stereoscopic information that changes the size or even the direction of the existing parallax in the visual display. Therefore, the depth between the eyes should be avoided as much as possible. Differences, so as not to affect the detection of three-dimensional stereo vision.
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