US-20260126571-A1 - METHOD AND APPARATUS FOR EXPANDING FOV OF GESTURE RECOGNITION DEVICE

US20260126571A1US 20260126571 A1US20260126571 A1US 20260126571A1US-20260126571-A1

Abstract

A method and an apparatus for expanding a field of view of a gesture recognition device. An aspect of the present disclosure provides a meta-grating structure layer including: a substrate; and a plurality of nanostructures provided on the substrate, wherein the nanostructures of different sizes are periodically arranged on the substrate.

Inventors

Min Sung YOON

Assignees

ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Dates

Publication Date: 20260507
Application Date: 20251028
Priority Date: 20241106

Claims (9)

1 . A meta-grating structure layer comprising: a substrate; and a plurality of nanostructures provided on the substrate, wherein the nanostructures of different sizes are periodically arranged on the substrate.
2 . The meta-grating structure layer of claim 1 , wherein a shape of the plurality of nanostructures is a square pillar shape.
3 . The meta-grating structure layer of claim 2 , wherein a height of the plurality of nanostructures is determined based on a light efficiency of a first-order diffracted light according to the height of the nanostructures, wherein the light efficiency is a ratio of an intensity of an light incident on the meta-grating layer and an intensity of the first-order diffracted light.
4 . The meta-grating structure layer of claim 2 , wherein a height of the plurality of nanostructures is between 600 nm and 1000 nm.
5 . The meta-grating structure layer of claim 2 , wherein a fill factor of the plurality of nanostructures increases periodically, wherein the fill factor is a ratio of a width of a nanostructure and a width of a basis.
6 . The meta-grating structure layer of claim 2 , wherein a width of the plurality of nanostructures increases periodically, wherein the width of the plurality of the nanostructures is between 30 nm to 380 nm.
7 . The meta-grating structure layer of claim 1 , wherein the plurality of nanostructures comprise TiO2.
8 . The meta-grating structure layer of claim 1 , wherein the substrate comprises fused silica.
9 . A system for expanding a field of view ΦFOV) of a gesture recognition device, the system comprising: one or more meta-grating structure layers according to claim 1 ; and a gesture recognition device comprising one or more recognition sensors for recognizing a gesture of a user, wherein each of the meta-grating structure layers is disposed on top of each of the recognition sensors to receive light output from each of the recognition sensors.

Description

CROSS-REFERENCE TO RELATED APPLICATION The present application claims priority to Korean Patent Application No. 10-2024-0156008, filed on Nov. 6, 2024 in the Korea Intellectual Property Office, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD The present disclosure relates to a method and an apparatus for expanding a field of view of a gesture recognition device. More specifically, the present disclosure relates to a method and an apparatus for expanding a range of a space recognizable by a gesture recognition device by using a meta-grating structure. BACKGROUND The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. In recent years, with the development of eXtended Reality (XR) display or holographic display technology, there is an increasing need for a gesture recognition device capable of interacting with immersive or 3D image content without a direct touch. In one example, a Leap Motion Controller (LMC) is a user interface device that is capable of finely recognizing a user's hand gesture. A recognition sensor of the LMC includes an RGB camera that distinguishes colors and an IR camera that distinguishes depths. The recognition sensor of the LMC may track the movement of both hands and each finger of the user, thereby controlling an image or interacting with content remotely from a computer vision platform. The size of a three-dimensional spatial region in which the LMC is capable of recognizing a hand gesture is defined by a recognition depth and a field of view (FOV). For example, referring to FIG. 9, in the case of an LMC (model name: leap motion controller 2) manufactured by Ultraleap, it is known that the recognition depth r is 10 cm≤r≤60 cm, and the field of view θFOV is 160°. Therefore, when a user's hand is located within the FOV range (θ≤θFOV), the LMC may recognize the user's hand, but when the user's hand is located outside the FOV range (θ>θFOV), the LMC may not recognize the user's hand. Limitations in the space recognizable by gesture recognition devices are problematic for hand gesture-based rehabilitation and rehabilitative training, XR instrument-based contactless interaction, robot/vehicle remote control, and the like. Therefore, there is a need for a technology capable of expanding a gesture recognition range of a gesture recognition device. SUMMARY An object of the present disclosure is to provide a method and an apparatus capable of enlarging or expanding a field of view (FOV) of a gesture recognition device. More specifically, the object of the present disclosure is to provide a system in which a user may interact more freely and contactlessly by enlarging or expanding an FOV of a gesture recognition device. The technical objects of the present disclosure are not limited to those described above, and other technical objects not mentioned above may be understood clearly by those skilled in the art from the descriptions given below. An embodiment of the present disclosure provides a meta-grating structure layer including: a substrate; and a plurality of nanostructures provided on the substrate, wherein the nanostructures of different sizes are periodically arranged on the substrate. Another embodiment of the present disclosure provides a system for expanding a field of view of a gesture recognition device, the system including: one or more meta-grating structure layers according to the embodiment above, and a gesture recognition device comprising one or more recognition sensors capable of recognizing a gesture of a user, each of the meta-grating structure layers is disposed on top of each of the recognition sensors to receive light output from each of the recognition sensors. According to an embodiment of the present disclosure, by using an optical device including a meta-grating structure layer, there is an effect that a field of view (FOV) of a gesture recognition device may be enlarged. According to an embodiment of the present disclosure, there is an effect that a region of a space recognizable by the gesture recognition device may be expanded by enlarging the FOV of the gesture recognition device. According to an embodiment of the present disclosure, a user's convenience, stability, immersion, and the like may be improved by expanding the region of a space recognizable by the gesture recognition device. The technical effects of the present disclosure are not limited to the technical effects described above, and other technical effects not mentioned herein may be understood to those skilled in the art to which the present disclosure belongs from the description below. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an exemplary diagram illustrating both a plan view and a side view of a meta-grating structure layer according to an embodiment of the present disclosure. FIG. 2 shows an exemplary diagram illustrating both a plan view and a side view of a unit c