What is a 3D holographic projection?

3D holographic projection is a picture projected on a screen that appears to be three -dimensional, which means it seems like a real object or person. Holograms were first developed in a photographic film in the mid -20th century, using laser light reflected the object. When the unfolded film was illuminated by the laser, the image appeared as an object reminiscent of the original. The picture would change when the viewer moved around him, like looking at real objects.

Later holograms have been developed that could develop by lasers, but were visible under normal lighting conditions. These holograms were often used on credit cards or other documents as a picture of security verification because they could not be reproduced by a standard printer. This allowed credit cards to protect holographic cards.

The oldest form of 3D holographic projection was often referred to as "Pepper's spirit". In Ton 1860s, phenomenonProfessor Pepper's ištní act used a scary image that appeared on stage with real actors. Over time, the image would disappear, which led many people to the belief that a real spirit appeared. The effect was created by a mirror made of Clear Glass.

6 "Pepper's Spirit" was created by angle leaves of glass located on the stage between actors and the audience. As the bright light illuminated the actress outside the foundation, the image bounced off the glass and towards the audience that created a scary image that seemed to be present on the stage. Attempts to improve the image failed due to the limits of visibility from normal sources of glass and light at that time.

In the 20th century, the development of high -ending television and projectors created a new form of 3D holographic projection. The new technology was used by a light projector that was still sending or video images through the magnifier lens and a thin reflective film. This technology could bI am broadcast on flat or curved surfaces and allowed people to see others in real time for video conferencing or stage performances. The projected image is two -dimensional, but the human brain interprets the image as three -dimensional, so the object seems to be real.

Other 3D holographic projection applications used laser instead of normal lighting. The standard visible light contains a wide range of light frequencies that are generated by bulb and travel in random directions. Laser light is a collimated beam, which means that the whole light travels in a very narrow beam of a single light frequency. If the object is illuminated by a laser, the reflected light sent to a 3D holographic projection screen is highly focused.

The laser beam focuses a much brighter and sharper image than normal light. The image will also remain in the focus if the image size or distance from the laser projector increases. This occurs because the laser beam is not distracted by the distanceIt is as normal light and therefore remains clean even if the image increases. Applications at the beginning of the 21st century grew in the field of communication, stage entertainment and three -dimensional advertising.