# US 2013/0155176 A1 · Reflective and Refractive Solutions to Providing Direct Eye Contact Videoconferencing > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0155176 A1 - Document ID: US20130155176A1 - Status: Published application - Kind: A1 - Application number: 13/715,188 - Filed: 2012-12-14 - Published: 2013-06-20 - Earliest claimed: 2011-12-16 - Assignees: Polycom, Inc. - Inventors: Gopal Paripally; Craig Clapp; Tony Pham - Web page: https://patentgrep.com/patent/US20130155176A1 ## CPC - H04N 7/15: Conference systems - H04N 7/144: {camera and display on the same optical axis, e.g. optically multiplexing the camera and display for eye to eye contact} - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract A videoconferencing unit for enhancing direct eye-contact between participants can include a curved fully reflective mirror to reflect the image of the near end to a camera. The curved mirror can be placed in front of the display screen near a location where images of faces/eyes of far end participants are to appear. In another example, the videoconferencing unit can include a disintegrated camera configuration that provides an air gap between a front lens element and a rear lens element. The front lens element can be located behind an aperture within the display screen. The air gap can provide an unobstructed path to light from projectors and therefore avoid any undesirable shadows from appearing on the display screen. In another example, the videoconferencing unit can include a combination of the disintegrated camera configuration and mirrors for providing direct eye contact videoconferencing. ## Claims ### Claim 1 A videoconferencing unit comprising: a display screen configured to display images of a far end participant; a first curved mirror positioned in front of the display screen at a location where an image of eyes of the far end participant is displayed; and a camera positioned to capture an image of a near end participant via a reflection from the first mirror through an air gap. ### Claim 2 (depends on 1) The videoconferencing unit of claim 1 wherein the first curved mirror is fully silvered. ### Claim 3 (depends on 1) The videoconferencing unit of claim 1 wherein the first curved mirror is positioned at a location approximately ¼th the height of the display screen below the top of the display screen. ### Claim 4 (depends on 1) The videoconferencing unit of claim 1 wherein the curved mirror is horizontally centered on the display screen. ### Claim 5 (depends on 1) The videoconferencing unit of claim 1 wherein the first curved mirror is affixed to the display surface. ### Claim 6 (depends on 1) The videoconferencing unit of claim 1 wherein the first curved mirror is mounted in a bracket affixed to the display surface. ### Claim 7 (depends on 1) The videoconferencing unit of claim 1 wherein the first curved mirror is attached to a substantially transparent arm, the arm being attached to a bezel of the display screen. ### Claim 8 (depends on 1) The video conferencing unit of claim 1, further comprising a processor configured to correct distortions caused by the first curved mirror in the image captured by the camera. ### Claim 9 (depends on 1) The videoconferencing unit of claim 1 further comprising a second mirror positioned to reflect the reflection from the first mirror onto the camera. ### Claim 10 (depends on 9) The videoconferencing unit of claim 9, wherein the second mirror is planar. ### Claim 11 (depends on 9) The videoconferencing unit of claim 9, wherein the second mirror has a curvature that corrects for distortions in the image caused by the first mirror. ### Claim 12 A videoconferencing unit comprising: a display screen having a front side, a rear side, and an aperture positioned near a location where an image of eyes of the far end participant is to be displayed; a projector positioned on the rear side of the display screen and configured to project the images of far end participants onto the display screen; a first lens element positioned to receive light reflected from the near end participant through the aperture; a rear lens element positioned on the rear side of the display screen and receiving light refracted by the first lens element, the first lens element and the rear lens element being separated by an air gap wherein a light path of the projected images passes through the air gap; and a camera sensor for receiving light refracted from the rear lens element and generating a corresponding near end image frame. ### Claim 13 (depends on 12) The videoconferencing unit of claim 12, wherein the projector is a ultra-short-throw projector. ### Claim 14 (depends on 12) The videoconferencing unit of claim 12 wherein the rear lens element is configured to correct distortions introduced by the first lens element. ### Claim 15 (depends on 12) The videoconferencing unit of claim 12 further comprising a processor configured to correct distortions in the image captured by the camera sensor introduced by at least one of the first lens and rear lens elements. ### Claim 16 (depends on 12) The videoconferencing unit of claim 12 wherein the rear lens element and camera sensor are integrated into a single assembly. ### Claim 17 (depends on 12) The videoconferencing unit of claim 12, further comprising a first reflective mirror for reflecting projected images of far end participants from the projector onto the rear side of the display screen. ### Claim 18 (depends on 17) The videoconferencing unit of claim 17, further comprising a second reflective mirror positioned behind the first lens element such that the rear lens element receives light refracted by the first lens element via reflection from the second reflective mirror. ### Claim 19 (depends on 12) The videoconferencing unit of claim 12 comprising a mirror positioned behind the first lens element and configured to reflect light refracted by the first lens element to the rear lens element. ### Claim 20 A videoconferencing unit comprising: a display screen configured to receive and display an image of a far end participant; an image sensor configured to capture an image of a near end participant; at least one optical element positioned near a location on the display where an image of eyes of the far end participant is to be displayed and configured to reflect or refract the image of the near end participant through an air gap to the image sensor. ### Claim 21 (depends on 20) The videoconferencing unit of claim 20 wherein the at least optical element comprises a mirror configured to reflect the image of the near end participant through an air gap to the image sensor. ### Claim 22 (depends on 21) The videoconferencing unit of claim 21 wherein the mirror is a curved mirror. ### Claim 23 (depends on 20) The videoconferencing unit of claim 20 wherein the at least one optical element comprises a lens configured to refract the image of the near end participant through an air gap to the image sensor. ### Claim 24 (depends on 20) The videoconferencing unit of claim 20 wherein the at least one optical element is located in front of the display screen. ### Claim 25 (depends on 20) The videoconferencing unit of claim 20 wherein: the at least one optical element is located behind the display screen; and the display screen includes an aperture positioned near a location on the display where an image of eyes of the far end participant is to be displayed. ### Claim 26 (depends on 20) The videoconferencing unit of claim 20 further comprising at least one of a programmed processor or one or more additional optical elements configured to correct distortions in the image of the near end participant introduced by the at least one optical element. ### Claim 27 (depends on 26) The videoconferencing unit of claim 26 wherein the one or more additional optical elements are integrally mounted with the image sensor. ### Claim 28 (depends on 20) The videoconferencing unit of claim 20 wherein the display screen is a projection screen. ### Claim 29 A method of providing direct eye contact in a videoconference, the method comprising: displaying an image of a far end participant on a display screen; capturing an image of a near end participant, the image being reflected or refracted through an air gap by at least one optical element positioned near a location on the display screen where eyes of the far end participant are displayed. ### Claim 30 (depends on 29) The method of claim 29 further comprising correcting distortion in the captured image of the near end participant introduced by the at least one optical element.