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KR-20260067636-A - Method And Apparatus for Expanding FOV Of Gesture Recognition Device

KR20260067636AKR 20260067636 AKR20260067636 AKR 20260067636AKR-20260067636-A

Abstract

A method and apparatus for expanding the field of view of a gesture recognition device are disclosed. According to one aspect of the present disclosure, a meta-grid structure layer is provided, comprising a substrate and a plurality of nanostructures provided on the substrate, wherein the nanostructures of different sizes are periodically arranged on the substrate.

Inventors

  • 윤민성

Assignees

  • 한국전자통신연구원

Dates

Publication Date
20260513
Application Date
20241106

Claims (9)

  1. Substrate; and It includes a plurality of nanostructures provided on the above substrate, and A meta-lattice structure layer in which the above-mentioned nanostructures of different sizes are periodically arranged on the substrate.
  2. In paragraph 1, A meta-lattice structure layer in which the shape of the plurality of nanostructures above is a square pillar shape.
  3. In paragraph 2, The height of the plurality of nanostructures is determined based on the light efficiency of the first-order diffracted light according to the height of the nanostructures, wherein The above-mentioned luminous efficiency is the ratio of the intensity of incident light incident on the meta-grid layer to the intensity of first-order diffracted light, in a meta-grid structure layer.
  4. In paragraph 2, A meta-lattice structure layer having a plurality of nanostructures with a height of 600 nm to 1000 nm.
  5. In paragraph 2, The fill factor of the plurality of nanostructures mentioned above increases periodically, The above filling factor is a meta-lattice structure layer in which the width of the nanostructure is divided by the width of the basis.
  6. In paragraph 2, The width of the plurality of nanostructures mentioned above increases periodically, but A meta-lattice structure layer, wherein the width of each of the above nanostructures is 30 nm to 380 nm.
  7. In paragraph 1, The plurality of nanostructures above are meta-lattice structure layers comprising TiO2 .
  8. In paragraph 1, The above substrate is a meta-lattice structure layer comprising fused silica.
  9. As a system for expanding the field of view of a gesture recognition device, One or more metalattice structure layers according to any one of claims 1 to 8; and A gesture recognition device equipped with one or more recognition sensors capable of recognizing a user's gesture, comprising: A system in which each of the above metagrid structure layers is disposed on top of each of the above recognition sensors to receive light output from each of the above recognition sensors.

Description

Method and Apparatus for Expanding FOV Of Gesture Recognition Device The present disclosure relates to a method and apparatus for expanding the field of view of a gesture recognition device. More specifically, it relates to a method and apparatus for expanding the range of space recognizable by a gesture recognition device by utilizing a meta-grating structure. The following description merely provides background information related to the present embodiment and does not constitute prior art. Recently, with the advancement of XR (eXtended Reality) display or holographic display technology, there is a growing need for gesture recognition devices that can interact with realistic or 3D video content without direct touch. For example, the Leap Motion Controller (LMC) is a user interface device capable of precisely recognizing a user's hand gestures. The recognition sensors of the Leap Motion Controller consist of an RGB camera that distinguishes colors and an IR camera that distinguishes depth. By tracking the movements of both hands and each finger of the user, the recognition sensors of the Leap Motion Controller allow for remote control of video or interaction with content on a computer vision platform. The size of the three-dimensional spatial area in which the Leap Motion controller can recognize hand gestures is determined by the depth of recognition and the field of view (FOV). For example, referring to Fig. 9, in the case of Ultraleap’s Leap Motion controller (model name: leap motion controller 2), the depth of recognition (r) is known to be 10 cm ≤ r ≤ 60 cm, and the field of view (θ FOV ) is 160°. Therefore, when the user’s hand is located within the field of view range (θ ≤ θ FOV ), the Leap Motion controller can recognize the user’s hand, but when the user’s hand is located outside the field of view range (θ > θ FOV ), the Leap Motion controller cannot recognize the user’s hand. The limitations of the spatial recognition range of gesture recognition devices pose a problem in hand movement-based rehabilitation therapy and training, XR device-based contactless interaction, and remote control of robots and vehicles. Therefore, technology is needed to expand the gesture recognition range of gesture recognition devices. FIG. 1 is an exemplary diagram showing a plan view and a side view together of a meta-lattice structure layer according to one embodiment of the present disclosure. FIG. 2 is an exemplary diagram showing a plan view and a side view of a unit cell constituting a meta-grid structure layer according to one embodiment of the present disclosure. Figure 3 is an example diagram illustrating an experimental method for determining the spacing, width, height, etc. of nanostructures arranged in a meta-lattice structure layer. Figure 4 is a graph showing the relationship between the width and phase change of a nanostructure. Figure 5 is a graph showing the relationship between the height of the nanostructure and the light efficiency. FIG. 6 is a table showing the diffraction angle ( θ1 ) and light efficiency (η) of the first-order diffracted light according to the incident angle of a plane wave incident on a meta-grid structure layer according to one embodiment of the present disclosure. FIG. 7 is a table showing the diffraction angle and light efficiency of the first-order diffracted light according to the angle of incidence of light incident on a meta-grid structure layer according to another embodiment of the present disclosure. FIG. 8 is an illustrative diagram for explaining an example of a space expansion system including an optical device according to one embodiment of the present disclosure. Figure 9 is an example diagram showing the field of view of a conventional gesture recognition device. Figure 10 is an example diagram showing the field of view of a gesture recognition device combined with an optical device. Some embodiments of the present disclosure are described in detail below with reference to exemplary drawings. It should be noted that in assigning reference numerals to the components of each drawing, the same components are given the same reference numeral whenever possible, even if they are shown in different drawings. Furthermore, in describing the present disclosure, if it is determined that a detailed description of related known components or functions could obscure the essence of the present disclosure, such detailed description is omitted. In describing the components of the embodiments according to the present disclosure, symbols such as first, second, i), ii), a), b), etc., may be used. These symbols are intended only to distinguish the components from other components, and the essence, order, or sequence of the components is not limited by the symbols. When a part in the specification is described as 'comprising' or 'having' a component, this means that, unless explicitly stated otherwise, it does not exclude other components but may include additional components. The det