Firstly, it is important to clarify a concept: Is a 3D billboard equivalent to a naked-eye 3D holographic projection? The answer is no. We will further explain the reasons, so please continue reading until the end.
Naked-eye 3D technology allows users to perceive a three-dimensional effect from a two-dimensional image or video without the need for any external devices.
This effect is primarily achieved through binocular parallax. But what exactly is binocular parallax?
Humans have two eyes that are approximately 65mm apart. When we focus on an object, our two eyes converge on that object, and the image of the object falls on corresponding points of each retina.
When the two images overlap, we should be able to see a single, clear object.
In simple terms, this is similar to how a camera focuses. When the lens is focused on a distant object, nearby objects appear blurry, and when the lens is focused on a nearby object, distant objects appear blurry as well.
Our eyes act like two lenses arranged horizontally on the same plane but in different positions. Therefore, the images captured by each eye are slightly different.
When the lenses focus on a single point, the surrounding images become blurred, while the central point remains clear. However, when the focus of the two eyes diverges (such as during daydreaming), the captured images cannot merge into a clear picture.
This is the principle behind binocular parallax, which creates a sense of depth and space when observing objects.
Here are some typical 3D billboard advertising examples!