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Unlocking the Future of VR: New Algorithm Turns iPhones Into Holographic Projectors

April 12, 2024
in Science
Unlocking the Future of VR: New Algorithm Turns iPhones Into Holographic Projectors
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Hologram Smartphone

A team from The University of Tokyo introduces a practical, cost-effective method for generating holographic images using smartphones, aiming to simplify and enhance 3D displays for virtual and augmented reality without the drawbacks of laser-based systems. (Artist’s concept).

The method for full-color 3D display shows potential for enhancing augmented and virtual reality experiences.

Scientists have created a method to produce 3D full-color holographic images using smartphone screens instead of lasers. This innovative technique, with additional advancements, holds the potential for augmented or virtual reality displays.

Whether augmented and virtual reality displays are being used for gaming, education, or other applications, incorporating 3D displays can create a more realistic and interactive user experience.

“Although holography techniques can create a very real-looking 3D representation of objects, traditional approaches aren’t practical because they rely on laser sources,” said research team leader Ryoichi Horisaki, from The University of Tokyo in Japan. “Lasers emit coherent light that is easy to control, but they make the system complex, expensive, and potentially harmful to the eyes.”

In the Optica Publishing Group journal Optics Letters, the researchers describe their new method, which is based on computer-generated holography (CGH). Thanks to a new algorithm they developed, they were able to use only an iPhone and an optical component called a spatial light modulator to reproduce a 3D color image that consisted of two holographic layers.

Two Holographic Layers

Researchers developed a 3D full-color display method that uses a smartphone screen, rather than a laser, to create holographic images. Shown are their experimental results, in which a continuous transition from the first layer to the second layer is observable. Credit: Ryoichi Horisaki, The University of Tokyo

“We believe that this method could eventually be useful for minimizing the optics, reducing costs, and decreasing the potential harm to eyes in future visual interfaces and 3D display applications,” said Otoya Shigematsu, the paper’s first author. “More specifically, it has the potential to enhance the performance of near-eye displays, such as the ones being used in high-end virtual reality headsets.”

A more practical approach

Although CGH uses algorithms to produce images, the coherent light from a laser is typically required to display these holographic images. In a previous study, the researchers showed that spatiotemporally incoherent light emitted from a white chip-on-board light-emitting diode could be used for CGH. However, this setup required two spatial light modulators — devices that control the wavefronts of light — which is impractical because of their expense.

In the new study, the researchers developed a less expensive and more practical incoherent CGH method. “This work aligns with our laboratory’s focus on computational imaging, a research field dedicated to innovating optical imaging systems by integrating optics with information science,” said Horisaki. “We focus on minimizing optical components and eliminating impractical requirements in conventional optical systems.”

Otoya Shigematsu With Optical Setup

First author Otoya Shigematsu is shown in the laboratory with the optical experiment setup used for the work. Credit: Ryoichi Horisaki, The University of Tokyo

The new approach passes light from the screen through a spatial light modulator, which presents multiple layers of a full-color 3D image. Although this may seem simple, it required carefully modeling the incoherent light propagation process from the screen and then using this information to develop a new algorithm that coordinated the light coming from the device screen with a single spatial light modulator.

Holographic images from a smartphone

“Holographic displays that use low-coherence light could enable realistic 3D displays while potentially reducing costs and complexity,” said Shigematsu. “Although several groups, including ours, have demonstrated holographic displays using low-coherence light, we took this concept to the extreme by using a smartphone display.”

To demonstrate the new method, the researchers created a two-layer optical reproduction of a full-color 3D image by displaying one holographic layer on the screen of an iPhone 14 Pro and a second layer on a spatial light modulator. The resulting image measured a few millimeters on each side.

The researchers are now working to improve the technology so that it can display larger 3D images with more layers. Additional layers would make images look more realistic by improving spatial resolution and allowing objects to appear at several different depths, or distances, from the viewer.

Reference: “Computer-generated holography with ordinary display” by Ryoichi Horisaki, Otoya Shigematsu and Makoto Naruse, 14 April 2024, Optics Letters.
DOI: doi:10.1364/OL.516005

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Copyright for syndicated content belongs to the linked Source : SciTechDaily – https://scitechdaily.com/unlocking-the-future-of-vr-new-algorithm-turns-iphones-into-holographic-projectors/

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