At present, there are three kinds of 3D glasses on the market: chromatic aberration, polarization and time division:
Color difference formula
Also known as complementary colors, common colored lenses such as red, blue, red and green are chromatic aberration 3D glasses. Color difference can be called color separation stereo imaging technology. Two images taken from different perspectives are printed in the same picture in two different colors. If you look at it with the naked eye, it will show a vague ghost. Only through the corresponding red and blue glasses can we see the stereoscopic effect, that is, filter out the colors in red and blue to form parallax. At this time, different images seen by two eyes will appear 3D stereoscopic effect when they overlap in the brain.
Schematic diagram of color difference 3D glasses;
The picture of the left projector passes through the red lens (left eye), and the red pixels removed during shooting will be automatically restored, thus producing a true color picture. When it passes through the blue lens (right eye), most of it is filtered out, leaving only a very dim picture, which is easily ignored by the human brain. On the contrary, the picture taken by the projector on the right side passes through the blue lens (right eye), and the blue pixels removed during shooting will automatically recover, resulting in a true color picture from another angle. When it passes through the red lens (left eye), most of it is filtered out, leaving only a dim picture, which is automatically filtered after the human eye reaches the brain.
Polarization type
Polarized 3D technology is also called polarized 3D technology, which is polarized 3D in English. Passive polarized glasses are used together. The image effect of polarized 3D technology is better than chromatic aberration, and the cost of glasses is not too high. At present, many cinemas are also using this technology, but there are requirements for the brightness of display equipment.
Polarized 3D glasses can be divided into circular polarized 3D glasses and linear polarized 3D glasses. The effect of circularly polarized 3D glasses is better and more realistic than that of linearly polarized 3D glasses.
Principle: Schematic diagram of polarized 3D glasses
The main reason for the stereoscopic impression is that the left and right eyes see different pictures, and the positions of the left and right eyes are different, so there will be some differences in the pictures.
When shooting stereoscopic images, you use two lenses, a left lens and a right lens. Then the image of the left lens is filtered by a transverse polarizer to obtain transverse polarized light, and the image of the right lens is filtered by a longitudinal polarizer to obtain longitudinal polarized light.
The left eye and the right eye of stereoscopic glasses are respectively equipped with a transverse polarizer and a longitudinal polarizer, and the transverse polarized light can only pass through the transverse polarizer and the longitudinal polarized light can only pass through the longitudinal polarizer. This ensures that things shot by the left camera can only enter the left eye, and things shot by the right camera can only enter the right eye, so it is stereoscopic.
Time division type
Also known as active shutter 3D glasses, it is a new type of video glasses, which belongs to a kind of head-mounted virtual display. Shutter 3D glasses are also called spectacle displays and portable cinemas. Shutter 3D technology can provide high-quality 3D display effect for home users. The realization of this technology requires a pair of active LCD shutter glasses to alternate the images seen by the left eye and the right eye, so that your brain can fuse the two images into one, thus creating a 3D depth sense of a single image.
Principle:
According to the refresh time of human eyes on the image frequency, only by increasing the quick refresh rate of the image (at least 120Hz) and refreshing the images of the left eye and the right eye at 60Hz can people not feel jittery about the image, and keep the same frame number as that of 2D video, so that the two eyes of the audience can see different images that switch rapidly and create illusions in their brains, and then they can watch stereoscopic images.
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Second, the advantages and disadvantages of 3D glasses and applicable occasions 3D glasses on the market:
Color difference: 3D glasses with colored lenses such as red, blue, red and green are more common.
Polarization type: linear polarized 3D glasses and circular polarized 3D glasses.
Time-sharing (shutter type): glasses display, portable cinema.
superiority
Color difference formula: 1. The production process has the longest history; 2. The imaging principle is simple; 3. Low implementation cost; 4. You can also watch it on the monitor.
Polarization type: 1. 3D imaging effect is good and restoration effect is good; 2. It is not affected by ambient light and has good comfort; 3. The cost of auxiliary equipment is low; 4. The viewing angle is larger than the active shutter type.
Time-sharing (shutter mode): 1.3D has outstanding effect and can maintain the original resolution of the picture; 2. The technology is easy to implement and the screen cost is low. As long as the update frequency can meet the requirements, it can be imported; 3. Wide angle of view.
disadvantaged
Color difference: 1.3D picture effect is poor; 2. Color difference will appear at the edge of the picture.
Polarization type: 1. 3D full HD picture cannot be horizontally realized; 2. The current technology cost is high; 3. The requirements for output equipment are higher.
Time sharing (shutter type): 1. After wearing glasses, the brightness decreases more; 2. Low viewing comfort in a bright room; 3.3D glasses shutter opening and closing are not completely synchronized with the left and right images, and crosstalk ghosting will occur; 4. Small viewing angle; 5. The price is more expensive; 6. The battery needs to be installed or charged, and the radiation generated will cause pathological changes to the human body.
Applicable occasions:
Color difference type: Choose according to the specific color difference.
Polarization: Suitable for some commercial cinemas or other high-end applications.
Time sharing (shutter mode): home users
Comparison between polarized light and time division
Advantages and disadvantages:
superiority
Polarizer type: 1, the glasses are light and radiation-free, which increases the audience and reduces the cost; 2. There is no flicker phenomenon (ghost) caused by glasses, and the picture is stable; 3. The viewing angle is larger than the active shutter type; 4, not affected by ambient light, good comfort.
Time division (shutter mode): 1, the 3D effect is outstanding, and the original resolution of the picture can be maintained; 2. The technology is easy to implement and the screen cost is low. As long as the update frequency can meet the requirements, it can be imported; 3. Wide viewing angle range (only applicable to active shutter 3D plasma TV).
disadvantaged
Polarization type: 1, 3D full HD picture cannot be realized horizontally, 3D picture definition is reduced by half, and resolution is low (1920× 540); 2. At present, the technology cost is high, and the application of polarized 3D technology requires the TV refresh rate to be above 240Hz.
Time sharing (shutter type): 1. After wearing glasses, the brightness decreases more; The switching frequency of 2.3D glasses is different from that of fluorescent lamps and other light-emitting devices, and the viewing comfort in bright rooms is low; The shutter opening and closing of 3.3D glasses are not completely synchronized with the left and right images, and crosstalk ghosting will occur; 4. The viewing angle of active shutter 3D LCD TV is small; 5. The price of active shutter 3D glasses is basically around 1000 yuan, which is relatively expensive and needs to be charged or charged.