Label: Stereo way Stereoscopic
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1, left and right images are inconsistent
Inconsistent caused by stereo mode:
The current three-dimensional video in the world is mainly time-division (switch glasses) and optical split (polarized glasses). What are the advantages and disadvantages of each of these two methods? Which one has a greater impact on healthy 3D? The following will be analyzed one by one.
The left x and right x are fully synchronized when shooting, and they need to be fully synchronized during playback. At this point, there will be no problem with the eyes. If the left 1 and the right 1 are completely synchronized during shooting, they will not be synchronized during playback, and an abnormal situation will occur.
When shooting a dynamic object, the camera often moves the object for a long distance in less than one second. At this time, the position of the object in each frame before and after the same eye changes significantly. Please note the left 1 and left 2, left 2 and left 3, left 3 and left 4, left 4 and left 5 and right 1 and right 2, right 2 and right 3, right 3 and right 4, right 4 in the following screens. With the right 5. There is a significant change in the size and position of objects in each frame of the image between them.
The stereoscopic principle of the time-division (shutter-type glasses) is to use the visual residual features of the human eye to sequentially enter the left and right images into the left and right eyes to achieve a stereoscopic image.
The first frame in the time division mode is assigned to the left eye for viewing, and the second frame is assigned to the right eye for viewing. At this time, stereoscopic errors do not occur, but when entering the second frame and the third frame image, serious occurrence occurs. Visual error! Because the human eye has visual residual phenomenon, the right eye sees the first image taken by the right camera, and the left eye sees the second image taken by the left camera, because the objects in the two images are different. More, the human eye will feel quite uncomfortable.
The time-division stereo TV and the time-division stereo projector can realize stereoscopic view of 1080p full-pixel, which is its advantage, so it is recommended that users use the time-division stereo mode when viewing static images. The time-division stereo mode is prone to unsynchronization when watching motion pictures. At present, the stereo projectors used in most stereoscopic theaters are time-divided, which is the main cause of dizziness. Why is there so many people in the "Avatar" stereoscopic movie say dizziness, the reason is here. This problem can be completely avoided if the time-division stereo image can be reassigned to fully synchronized playback during playback, or polarized glasses can be used to achieve full synchronization of stereoscopic movies.
At present, the optically-divided horizontally-interpreted TV sets (commonly known as non-flashing) can only realize 1920×540 pixel stereograms, which is its shortcoming, but the full synchronization of the left and right eyes is its advantage, which can be comfortably viewed without dizziness. Stereo movie.
The dual projector stereo projection method is still the most comfortable and highest pixel stereo display method.
In addition to the insurmountable causes caused by the time-division stereo method, there are other causes of human error:
Causes of shooting: The two lens shutters are out of sync, the aperture is inconsistent, and the focus resolution is inconsistent.
Causes of editing: high and low image errors of left and right images, misalignment of front and rear frames, and different brightness of left and right images.
Causes of the screening: left and right image position error, front and rear frame misalignment, and different brightness and darkness of the left and right images.
Therefore, industry stereoscopic video standards and testing institutions should be established to prevent false stereoscopic sources from entering the market.
2. The incorrectly edited stereo image causes the human eye to be out of sight
When the eye is looking forward, as the object is near to far, the line of sight of both eyes is gradually changed from inside to parallel. Viewing infinity objects such as the sun's eyes is parallel. If a person's eyes are outwardly inclined, there are only two possibilities: 1. The eyes are sick. 2. Watching the wrong perspective.
Double-eye line of sight
Therefore, when making a stereoscopic film, the farthest scene in the left and right images should not exceed 65 mm when the film is enlarged to the cinema screen 10 meters wide. Otherwise, the stereogram will force the eyes to be out of the way, causing the eyes to be uncomfortable.
3, left and right image cross stitch
One eye sees the image that should be seen and also sees another image with a lighter color. This is the left and right image crosstalk, which reduces the stereoscopic effect and causes visual discomfort.
Left and right eye image series
This reason is mainly due to the following aspects:
The alignment between the polarized screen of the optical sub-television and the pixel is not accurate.
Polarized glasses have poor polarization properties.
The time-division TV has insufficient liquid crystal response speed and residual image.
The switching performance of the LCD glasses is not good.
4, left and right image interchange
When the left eye sees the right image and the right eye sees the left image, there will be an anti-stereoscopic phenomenon, that is, the distant scene ran close, and the nearby scene ran to a distant place. This abnormality comes from editing errors, playback errors, or inconsistencies in stereoscopic standards.
Recommendation: When establishing industry standards, the top and bottom views are determined as top left and right. The playback order is first left and right. The left and right identification codes are added during image editing, and the left and right images can be recognized at any time during playback to prevent the phenomenon of anti-stereoscopic.
5, the background caused by the close-range image representation can not be merged
When people watch close-up scenes, distant scenes will be blurred. When watching a distant scene, the close-up scene will be blurred. This is in line with the actual situation of people in life. The method of expressing close-range scenes can cause great problems if applied to stereoscopic movies. If you look at an object that reaches about 1 meter, the focus of the eyes is clear, and the separation of the left and right scenes in the distance is too large, and may be far more than 65 mm on the large screen.
Recommendation: In general, the distance between the binocular converger (image overlay) and the screen (center layer) should not be too far. The background scene can be removed to a blank background when needed. When the standard focal length lens is normally shot, the distance between the two lenses is about 65 mm (60-70 mm), and the angle between the lenses when the long focal length lens is taken at a long distance is 1-3 degrees.
Summary: Stereoscopic video that violates the visual principle is like a fake drug. It is a harm to the human body. Its manufacture, sale, and broadcasting are crimes of different degrees. Now this crime is like a crime in the primitive society, and it is a kind of law without supervision. In the case of crime, no major liability is required. However, this has caused people's bad influence on stereoscopic movies and stereoscopic TVs. "Seeing dizziness" has become synonymous with stereoscopic video. We must pay attention to the relationship between 3D video viewing and health, and also strengthen the production and monitoring of stereoscopic video works, and promote the development of the entire 3D industry.
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