Is holographic projection technology pseudo-holographic?

Holographic projection technology is really holographic, and the 3D effect is very good.

Orthographic holographic display, also known as virtual imaging technology, is a technology that records and reproduces the real three-dimensional image of an object by using the principles of interference and diffraction.

Visual principle

Note: This is the visual principle in 3D imaging. Slightly different from this, holographic projection actually presents a 3D image.

Everyone has two eyes, and the angle of view of each eye is about 80 degrees, but the angle of view of the two eyes together is only 120 degrees, which means that the 40-degree angle of view is coincident, so what we see with our left and right eyes is actually different. For example, if you close your left eye and look at it with your right eye, or vice versa, you can test the effect, and the objects received by your left and right eyes can be forwarded to your brain to judge the distance of the objects and form a stereoscopic impression. Simulating this process forms 3D stereo technology.

After the shooting, in the projection room, the 3D film source is placed on the screen at a certain angle, and the audience needs to wear 3D glasses to watch. Looking closely at 3D glasses, we will find that there are dense pinstripes on the left and right lenses in different directions. The left lens is vertical and the right lens is horizontal. It is these stripes that we can see a wonderful three-dimensional picture.

After photography is completed, the image is decomposed according to binocular effect, so that the left eye can only see the left picture and the right eye can only see the right picture. Only in this way can the brain judge the distance and produce a three-dimensional sense. When screening, the left-leaning picture and the right-leaning picture use different projection light. Although the color pictures are the same, the propagation direction of the projected light is different. The left-leaning diagram uses longitudinal wave light (light waves propagate in the longitudinal direction), while the right-leaning diagram uses transverse wave light (light waves propagate in the transverse direction). Because of the characteristics of polarized light, longitudinal wave light can only pass through longitudinal stripes, but not transverse stripes. So through the left lens, only the one leaning to the left can be seen.