WO2019041614A1 - Dispositif de visiocasque à réalité virtuelle immersive et procédé d'affichage de réalité virtuelle immersive - Google Patents

Dispositif de visiocasque à réalité virtuelle immersive et procédé d'affichage de réalité virtuelle immersive Download PDF

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Publication number
WO2019041614A1
WO2019041614A1 PCT/CN2017/114192 CN2017114192W WO2019041614A1 WO 2019041614 A1 WO2019041614 A1 WO 2019041614A1 CN 2017114192 W CN2017114192 W CN 2017114192W WO 2019041614 A1 WO2019041614 A1 WO 2019041614A1
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WO
WIPO (PCT)
Prior art keywords
image
head
virtual reality
optical system
mounted display
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PCT/CN2017/114192
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English (en)
Chinese (zh)
Inventor
李海峰
陆驰豪
刘旭
刘玛丽
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浙江大学
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Publication of WO2019041614A1 publication Critical patent/WO2019041614A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/0101—Head-up displays characterised by optical features
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/017—Head mounted
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/332—Displays for viewing with the aid of special glasses or head-mounted displays [HMD]
    • H04N13/344—Displays for viewing with the aid of special glasses or head-mounted displays [HMD] with head-mounted left-right displays
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/0101—Head-up displays characterised by optical features
    • G02B2027/0138—Head-up displays characterised by optical features comprising image capture systems, e.g. camera
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/0101—Head-up displays characterised by optical features
    • G02B2027/014—Head-up displays characterised by optical features comprising information/image processing systems

Definitions

  • the present invention relates to a three-dimensional display technology neighborhood, and in particular to an immersive virtual reality head-mounted display device and an immersive virtual reality display method.
  • Virtual reality technology is a computer simulation system that can create and experience virtual worlds. This technology is mostly used for entertainment, such as immersive video games. But virtual reality technology is also very important in other fields, such as medicine, military aerospace and so on.
  • the current mainstream virtual reality devices on the market such as HTC Vive, Oculus Rift, etc., do not reach the best field of view (120°) of the head-mounted display. Therefore, it is impossible to maximize user immersion.
  • the devices used for head tracking and attitude detection are too complicated and require a large space to support the operation of the device.
  • Most of the virtual reality devices on the mobile side use the gyroscope to achieve head tracking, and the tracking accuracy cannot be guaranteed.
  • the object of the present invention is to provide an immersive virtual reality head-mounted display device and an immersive virtual reality display method, which can ensure the head tracking accuracy while realizing a large field of view, and has little space for operation.
  • an immersive virtual reality head mounted display device includes a head tracking and attitude detecting system, a head mounted display optical system, an image dividing system, and an encoding and decoding system. And a processing system; the head tracking and attitude detecting system is used for capturing an image of a peripheral environment of the human eye, and the encoding and decoding system decodes the image signal of the tracking and attitude detecting system and transmits it to the processing system, and processes and decodes the image through the processing system.
  • the system is encoded and transmitted to the image segmentation system, and the image segmentation system divides the received image information into a plurality of display images and displays them through the head-mounted display optical system.
  • the head tracking and attitude detection system is used to capture the peripheral environment scene image and obtain the head position and posture information
  • the processing system may be an external computer, and the computer superimposes the peripheral environment scene image information and the virtual video information to realize the real world and At the same time, the computer adjusts the virtual video information according to the change of the head position and the posture information so that the peripheral environment scene image is more integrated in reality.
  • the head tracking and attitude detecting system includes a live view unit for actual shooting of a peripheral scene placed at a left and right eye position of a person, a panoramic camera unit for panoramic shooting of a peripheral scene, and a position and attitude sensor.
  • the environment panorama obtained by panoramic camera shooting is used as a base on which peripheral scenes captured by two conventional cameras located at the left and right eyes are superimposed. Because the panoramic camera unit has a larger shooting range, but the resolution is lower, the conventional camera has a smaller shooting range and a higher resolution. The effect of such overlap is that in a large image with a lower resolution, a part of the area (i.e., the normal camera shooting area, that is, the normal eye observation area) is higher than the surrounding resolution. Adding a surrounding environment with a low resolution can deepen the user's sense of presence.
  • the above video overlay process is implemented by an FPGA in an image segmentation system in a head mounted display device.
  • the video signals from the conventional camera and the panoramic camera unit are combined into one video signal and encoded, and connected to the encoding and decoding system for decoding by a cable, and the decoded video is input to the processing system through the USB3.0 port for calculation.
  • the head-mounted display optical system includes two sets of monocular optical systems arranged symmetrically in a left-right direction;
  • the monocular optical system includes a lens group sequentially disposed in front of the human eye and placed in the lens group a rear display;
  • the lens group includes at least one set of Fresnel lenses, each set of Fresnel lenses consisting of two resin plates engraved with a Fresnel lens sawtooth structure;
  • the display is two, respectively parallel to the corresponding resin plate
  • the angle ⁇ between the apex of the splicing of the two resin sheets to the center of the eyeball and the optical axis perpendicular to the eyeball is greater than 0°.
  • Fresnel lens group is used to magnify the virtual image of the image displayed on the display.
  • Each group of Fresnel lens is spliced by two resin plates engraved with Fresnel lens sawtooth structure. The reason is that the spliced Fresnel lens is used.
  • the group replaces the ordinary lens in order to make the left and right fields of view more convenient when splicing. If an ordinary lens group is used, since the shape is generally circular, seamless stitching cannot be achieved when the left and right imaging systems are spliced.
  • the two resin plates are spliced, and since the shape is rectangular, there is no gap after the two rectangles are spliced.
  • the image displayed by the display is not visible to the human eye at this time.
  • the final complete binocular system contains the above two sets of monocular systems. If this angle requirement is not set, then when the human eye observes infinity, both eyes fall on the Fresnel lens stitching of the two systems. At this point, both eyes cannot get the image from the display, so this location becomes a blind spot. When this angle is set, due to binocular convergence, when one eye looks at the splicing of the Fresnel lens, the other eye will inevitably not look at its splicing place, so there is no blind spot.
  • a more specific solution is that the two resin sheets are spliced into an L-shape; the lens group includes two sets of Fresnel lenses arranged in parallel; the displays located in the left front and the right front of the human eye are respectively formed by the visual optical system to enlarge two
  • the virtual image has an overlap region ⁇ in space, and within the overlap region ⁇ , the image brightness of the two displays gradually darkens from the overlap of the display to the edge.
  • the image brightness of the two displays gradually dims from the overlap of the display to the edge for the consistency of the final composite image brightness.
  • each L-type Fresnel lens, each arm and the rear optical lens are composed A visual optical system, and the parameters of the optical system are as follows:
  • the horizontal and vertical fields of view are greater than 80°, the medial half angle is 45°, and the overlap area is 90°;
  • the two-arm visual optical system is assembled into a monocular optical system with a field of view greater than 120°.
  • the two arms of the L-type Fresnel lens are each a set of optical systems with an angle of view above 80°, and after splicing, they become an optical system with a field of view of 120° or more.
  • the monocular field of view of the head-mounted display optical system is greater than 120°
  • the binocular field of view is greater than 150°
  • the overlap portion is greater than 90°.
  • the immersive virtual reality display method provided by the present invention comprises the following steps:
  • the step 1) comprises: taking a panorama of the peripheral environment as a base by using a panoramic camera, and superimposing a peripheral environment image captured by a conventional camera on the substrate.
  • the head tracking and posture detection of the present invention are realized by a combination of a panoramic ring imaging system and a nine-axis motion sensor such as a gyroscope. Therefore, the accuracy of head tracking and attitude detection can be improved without increasing the space occupied by the device;
  • the wearing optical system of the present invention adopts a multi-display viewing angle splicing method, so that the viewing angle of the virtual display device can be improved to achieve the optimal viewing angle of the head mounted display, thereby improving user immersion;
  • the present invention utilizes a combination of a panoramic camera system and a real-life camera system to obtain a peripheral real scene, so that it is possible to obtain as large a peripheral real scene as possible without reducing the resolution, thereby strengthening The user's sense of presence.
  • FIG. 1 is a schematic structural view of an embodiment of the present invention
  • FIG. 2 is a schematic structural view of an immersive head mounted display optical system according to an embodiment of the present invention.
  • FIG. 3 is a detailed structural view of one of the arm visual optical systems of the immersive head mounted display optical system according to the embodiment of the present invention.
  • the immersive virtual reality head-mounted display device includes a head tracking and attitude detecting system 1, a head-mounted display optical system 2, an image segmentation system 3, an encoding and decoding system 4, and a processing system 5.
  • the encoding and decoding system 4 first decodes the signal of the head tracking and attitude detecting system 1 and transmits it to the processing system 5. After being processed by the processing system 5, it is encoded by the encoding and decoding system 4 into a signal that can be recognized by the image segmentation system 3. To the image segmentation system 3, the image segmentation system 3 restores the image coded information drawn by the processing system 5, and divides it into a plurality of display images, which are transmitted to the head mounted display optical system 1 for display.
  • the processing system 5 includes an external computer.
  • the head tracking and attitude detecting system 2 includes a live view unit, a panoramic camera unit, and a position and attitude sensor.
  • the real-life camera unit includes two conventional cameras respectively placed at the left and right eye positions of the person for actual shooting of the peripheral scene, and provides a real-life image for the virtual integration of the video by the head-mounted display device.
  • the panoramic camera unit includes a panoramic imaging unit for panoramic shooting of peripheral scenes to provide an image for the position and posture of the head mounted display device.
  • the position and attitude sensors can be gyroscopes.
  • the head-mounted display optical system 2 includes two sets of monocular optical systems placed symmetrically left and right, wherein a monocular optical system 05 is placed in front of the left eye 07, and a monocular optical system is placed in front of the right eye 08. .
  • Each monocular optical system includes a lens group that is placed in front of the human eye in turn, and is placed on After the lens group, two displays placed in the left front and the right front of the human eye, respectively placed on the left front and the right front of the left eye 07 are the OLED display 01 and the OLED display 02, respectively, placed in the left front of the right eye 08 And the right front are respectively OLED display 03 and OLED display 04, wherein each OLED screen has a resolution of 1000x1200, and a large field of view is synthesized by two OLEDs, each of which has a resolution of 2000x1200.
  • the lens group includes at least one L-type Fresnel lens, and the first lens near the human eye employs an L-type Fresnel lens.
  • the lens group includes an L-type Fresnel lens and an aspherical lens, wherein the L-type Fresnel lens close to the human eye is composed of two resin plates connected at both ends, and each of the two surfaces of each resin plate has at least one side The surface is engraved with a sawtooth structure of a Fresnel lens, and the angle ⁇ between the apex of the two resin plates connecting the L-type Fresnel lens to the center of the eyeball and the optical axis perpendicular to the eyeball is greater than 0°.
  • both eyes look at the splicing of the two resin plates of the L-type Fresnel lens at the same time, thereby causing blind spots.
  • Each arm of the L-type Fresnel lens and the optical lens behind it form a complete visual optical system.
  • the specific structure can be as shown in Figure 3. It contains a Fresnel lens and two aspheric surfaces close to the human eye. Plastic lens lens. The left side is the position of the human eye and the right side is the position of the display.
  • the display uses an OLED display with a pixel size of approximately 50 um and a stripline pair of 10 lp/mm.
  • the OLED display screens located on the left and right sides of the same eye respectively form an enlarged virtual image by L-type Fresnel lenses, and the two virtual images have overlapping regions ⁇ in space.
  • the image brightness of the two displays gradually darkens from the overlap of the display to the edge, so that after the images of the overlapping regions are superimposed, the total brightness of the two displays is the same as the brightness of the non-overlapping regions of the two displays.
  • Each of the L-type Fresnel lenses described above, each of which is followed by an optical lens, constitutes a complete visual optical system, and the parameters of the optical system are as follows:
  • the horizontal and vertical fields of view are greater than 80°, the medial half angle is 45°, and the overlap area is guaranteed to be 90°; the visual optical system of the two arms is combined into a monocular optical system with a field of view greater than 120°.
  • the two arms of the L-type Fresnel lens are each a set of optical systems with an angle of view above 80°, which becomes a splicing Optical system above 120° field of view.
  • the head tracking and attitude detecting system 1 captures a peripheral real-life image, including a panoramic camera system and a video taken by a conventional camera placed at the left and right eye positions, and uses an FPGA in the encoding and decoding system 4 to synthesize a video signal.
  • the encoding is performed by cable to the encoding and decoding system on the processing system 5 side for decoding, and the decoded video is input to the processing system 5 through the USB 3.0 port for calculation, to obtain peripheral real scene acquisition, and head tracking and attitude detection. .
  • the processing system 5 superimposes the virtual video signal to be displayed on the obtained actual video signal, encodes it into a format recognizable by the image segmentation system 3 by the encoding and decoding system 4, and transmits it to the image segmentation system 3 through the cable.
  • the image segmentation system 3 restores the image coded information drawn by the processing system 5 and divides it into a plurality of display images, which are connected to the driver of the OLED image source in the immersion head mounted display optical system 2.
  • the human eye can obtain a virtual image superimposed on the peripheral real environment by wearing the display optical system 2.
  • the image signal is drawn by a computer graphics card at a resolution of 2000x1200, and is split into two 1000x1200 resolution images by the segmentation system 3.
  • Aberration correction is achieved by a combination of a Fresnel lens and an aspherical lens.
  • Large field of view immersive display through image fusion. The final effect is that the field of view of a single eye is greater than 120 degrees, the field of view of both eyes is greater than 150 degrees, and the overlap is greater than 90 degrees.
  • the immersive virtual reality display method includes the following steps:

Abstract

L'invention concerne un dispositif de visiocasque à réalité virtuelle immersive et un procédé d'affichage de réalité virtuelle immersive. Le dispositif de visiocasque comprend un système de détection d'orientation et de suivi de tête (1), un système optique de visiocasque (2), un système de segmentation d'image (3), un système de codage et de décodage (4) et un système de traitement (5). Le système de détection d'orientation et de suivi de tête (1) est utilisé pour capturer une image de l'environnement périphérique d'un oeil humain. Le système de codage et de décodage (4) décode un signal d'image du système de détection d'orientation et de suivi de tête (1) avant de transmettre le signal d'image décodé au système de traitement (5). Une fois que ledit signal a été traité par le système de traitement (5), le système de codage et de décodage (4) effectue un codage, et des informations d'image sont transmises au système de segmentation d'image (3). Le système de segmentation d'image (3) divise les informations d'image reçues en une pluralité d'images d'affichage, puis le système optique de visiocasque (2) met en oeuvre un affichage. Le système de détection d'orientation et de suivi de tête (1) capture une image de l'environnement périphérique et acquiert des informations de position et d'orientation de tête, et superpose des informations vidéo virtuelles sur les informations d'image de l'environnement périphérique, de façon à combiner ainsi le monde réel et le monde virtuel.
PCT/CN2017/114192 2017-09-04 2017-12-01 Dispositif de visiocasque à réalité virtuelle immersive et procédé d'affichage de réalité virtuelle immersive WO2019041614A1 (fr)

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CN201710786863.XA CN107462994A (zh) 2017-09-04 2017-09-04 沉浸式虚拟现实头戴显示装置和沉浸式虚拟现实显示方法
CN201710786863.X 2017-09-04

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