Patent ID: 11954829
Assignee: COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A videoconferencing system, configured to transmit and receive multimedia signals to and from N remote videoconferencing systems, with N≥1, allowing a user to communicate in real time with N interlocutors using these remote systems, comprising:
a display screen, comprising a matrix of emissive pixels that is configured to display, at various successive display times ti, an image Ie(ti) containing N images Iint(k)(ti) transmitted by the remote systems and depicting the face of the interlocutors;
a camera, configured to acquire, at various successive acquisition times tj, an image Ic(tj) of the face of the user;
an optical device comprising single-pixel imagers, configured to determine N correction images Ico(k)(tj) on the basis of sub-matrices SMimp(k)(tj) of at least one single-pixel imager, at the various acquisition times tj, comprising:
at least one optical source, configured to emit a light beam of wavelength located outside of the visible spectrum and that irradiates a predefined angular region Za covering an ocular portion Po(tj) of the face of the user containing his eyes;
a matrix of single-pixel imagers, each configured to collect a part of the irradiating light beam reflected by the ocular portion Po(tj) and to reconstruct a correction image Ico(k)(tj) on the basis of the collected light beam, and each comprising a single photosensitive region, the photosensitive regions being integrated into the display screen and located in a main region (Zp) of the display screen, in which main region the N images Iint(k)(tj) of the interlocutors are located;

a processing unit, configured to:
determine, in each image Iint(k)(tj) of the image Ie(tj), a target point Pc(k)(tj) located at the eyes of the interlocutor, then selecting N sub-matrices SMimp(k)(tj) each centred on a target point Pc(k)(tj);
correct the image Ic(tj) by replacing a region of the image Ic(tj) depicting the ocular portion Po(tj) with the N correction images Ico(k)(tj), thus obtaining N corrected images Icc(tj) each to be transmitted to the remote system of the corresponding interlocutor.