In simple terms, naked-eye 3D refers to the ability to see a three-dimensional visual effect without relying on external devices such as glasses or headsets.
The imaging principle of naked-eye 3D technology is based on binocular disparity of the human eye. However, the visual effect of naked-eye 3D is not equivalent to naked-eye 3D technology.
The visual effect of naked-eye 3D is more of a pseudo-3D effect formed by visual illusions, whereas naked-eye 3D is an imaging technology that currently includes mainstream technologies such as light barrier technology, cylindrical lens technology and integrated imaging technology.
Most of the outdoor large screens currently belong to the category of naked-eye 3D visual effects. Although they are not truly naked-eye 3D technology, after being creatively developed by artists or designers, they can present various astonishing stereo effects.
How to achieve such a realistic 3D effect?
As we all know, our human brain is an extremely complex neural system. Anything that the human eye sees at ordinary times is three-dimensional because the two eyeballs of a person see two pictures with slight differences through the small distance between the eyes. This subtle difference enables the brain to calculate the spatial coordinates between objects in the direction of gaze, thus enabling us to distinguish the distance and size of objects, namely stereo and three-dimensional sense.
Simply put, it is to display two slightly different images in the same position using the principles of binocular vision in humans, so that both the left and right eyes can see them, and then form a stereoscopic sensation through processing by the brain.
For example, in 3D movies, the content given to viewers’ left and right eyes is separated by glasses or other devices, allowing each eye to receive the image for the left or right eye respectively, and finally presenting a feeling of 3D images in our brain.
For display screens to achieve the effect of naked-eye 3D, the cost is much higher than wearing 3D glasses in cinemas. At present, most LED large screens that achieve naked-eye 3D effects borrow objects’ distance, shadow effects and perspective relationships to construct three-dimensional effects in a two-dimensional image. It’s like looking at a pencil drawing, where painters can create realistic-looking three-dimensional images on a flat surface with just a pencil.
How to make a 3D effect with a flat animation? Just use a reference object well. We divide regular pictures into several layers using white lines and make the animation part “break through” the white lines, covering other elements in the layer, so that we can form the illusion of 3D using parallax of the eyes.
Have you noticed that all 3D screens we see are composed of two different angled faces?
The display screen folds at 90 degrees and uses video materials conforming to the perspective principle. The left screen displays the left view of the image, and the right screen displays the main view of the image. When a person stands in front of the corner and observes, they can see both the side and front of the object at the same time, thus presenting a realistic stereo effect.”
