Patents by Inventor Tristan Halna Du Fretay

Tristan Halna Du Fretay has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20200221009
    Abstract: At least one embodiment of a method for setting camera parameters of a camera, the method comprising: obtaining a first set of image characteristic values of images captured by the camera at a first lighting condition, the image characteristics being dependent on the camera parameters, at least two image characteristic values of the first set respectively corresponding to at least two different values of a same camera parameter; determining at least one second set of image characteristic values by adapting values of the obtained first set of image characteristic values from images captured by the camera at at least one second lighting condition, at least two image characteristic values of the second set respectively corresponding to at least two different values of a same camera parameter; selecting camera parameter values, based on the determined at least one second set of image characteristics; and modifying settings of the camera as a function of the selected values.
    Type: Application
    Filed: July 2, 2018
    Publication date: July 9, 2020
    Inventors: Johann CITERIN, Gérald KERGOURLAY, Pierre VISA, Falk TANNHAUSER, Romain BELLESSORT, Tristan HALNA DU FRETAY
  • Patent number: 9794534
    Abstract: An image processing device processes a first sub-image of an image split into sub-images. Each sub-image is displayable by a display device. The image processing device is associated with a first display device and connects to a source device through a first network and to another image processing device through a second network. The image processing device includes first and second receiving units and a generating unit. The first receiving unit receives the first sub-image from the source device via the first network. The second receiving unit receives, via a second network, at least one part of at least one second sub-image to be displayed by another display device, wherein the received at least one part is adjacent to the received first sub-image. The generating unit generates a first clustered sub-image to be displayed by the first display device, based on the received first sub-image and adjacent part.
    Type: Grant
    Filed: November 10, 2014
    Date of Patent: October 17, 2017
    Assignee: Canon Kabushiki Kaisha
    Inventors: Brice Le Houerou, Falk Tannhauser, Tristan Halna Du Fretay, Arnaud Closset
  • Publication number: 20150138042
    Abstract: An image processing device processes a first sub-image of an image split into sub-images. Each sub-image is displayable by a display device. The image processing device is associated with a first display device and connects to a source device through a first network and to another image processing device through a second network. The image processing device includes first and second receiving units and a generating unit. The first receiving unit receives the first sub-image from the source device via the first network. The second receiving unit receives, via a second network, at least one part of at least one second sub-image to be displayed by another display device, wherein the received at least one part is adjacent to the received first sub-image. The generating unit generates a first clustered sub-image to be displayed by the first display device, based on the received first sub-image and adjacent part.
    Type: Application
    Filed: November 10, 2014
    Publication date: May 21, 2015
    Inventors: BRICE LE HOUEROU, FALK TANNHAUSER, TRISTAN HALNA DU FRETAY, ARNAUD CLOSSET
  • Patent number: 8948688
    Abstract: The present invention relates to a method for managing communications in a wireless communications network having a mesh or “relay-based” communication mode operating according to a relay scheme. The network includes network devices defining transmission links between them. The method includes initially detecting a mobile obstacle within the network coverage area; dynamically tracking the detected obstacle by iteratively determining a monitoring area including the detected obstacle; selecting, from the transmission links, a subset of monitoring links belonging at least partly to the monitoring area and monitoring a perturbation level of the selected monitoring links to determine movement of the mobile obstacle in the coverage area; and dynamically adapting the relay scheme of the network based on the belonging or not belonging of the transmission links between network devices to the selected subset.
    Type: Grant
    Filed: January 27, 2012
    Date of Patent: February 3, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Pascal Lagrange, Brice Le Houerou, Tristan Halna Du Fretay
  • Publication number: 20130321701
    Abstract: Method, device, computer program and information storage means for transmitting a source frame into a video display system, the video display system (10) comprising a plurality of projectors, the video display system (10) further arranged to produce a projected image (106) from the source frame (100), each projector (102, 103, 104, 105) arranged to display a sub-frame (106A, 106B, 106C, 106D) of the projected image (106). The video display system further comprises capability to arrange a display delay, equal to a delay between reception of a source frame synchronization signal and a sub-frame display synchronization signal, dependent on the positions and the orientations of the video projectors, such that display of the projected image begins before at least one projector has received an associated complete sub-frame.
    Type: Application
    Filed: May 29, 2013
    Publication date: December 5, 2013
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: TRISTAN HALNA DU FRETAY, Hirohiko Inohiza
  • Patent number: 8326994
    Abstract: A method is proposed for setting up a communications path between a first communications sub-network and a second communications sub-network by means of an intermediate communications sub-network in an extended communications network. More specifically, to set up the communications path, said intermediate sub-network comprises at least two tunnel end-points and an input tunnel end-point of said intermediate sub-network which performs the following steps of: receiving, from a tunnel of said input tunnel end-point, a relay activation message to set up said path, said message referring to a local relay involving said input tunnel end-point; determining, from said relay activation message, an output tunnel end-point of said intermediate sub-network involved in the local relay; activating the local relay for a part of said path between said first sub-network and said second sub-network transmitting the relay activation message to said output tunnel end-point.
    Type: Grant
    Filed: April 3, 2009
    Date of Patent: December 4, 2012
    Assignee: Canon Kabushiki Kaisha
    Inventors: Philippe Boucachard, Tristan Halna Du Fretay
  • Patent number: 8238269
    Abstract: A method is proposed for balancing a latency of transmission of data content in a communications tree in a synchronous communications network, the communications tree comprising a root node on which a junction terminal is connected, the communications tree comprising leaf nodes on which terminals are connected, the root node and the leaf nodes being interconnected by intermediate nodes, the nodes being interconnected by links. The method comprises determining, for each node of the communications tree, a maximum value of latency associated with each path going from said node up to leaf nodes in a direction opposite to the junction terminal, and applying to each link at a node, the link running from the node in the direction opposite to the junction terminal, a supplement of latency balancing that corresponds to a difference between a maximum value of latency of each link and a maximum value.
    Type: Grant
    Filed: December 11, 2009
    Date of Patent: August 7, 2012
    Assignee: Canon Kabushiki Kaisha
    Inventors: Pascal Rousseau, Tristan Halna Du Fretay, Yacine El Kolli
  • Publication number: 20120196527
    Abstract: The present invention relates to a method for managing communications in a wireless communications network having a mesh or “relay-based” communication mode operating according to a relay scheme. The network includes network devices defining transmission links between them. The method includes initially detecting a mobile obstacle within the network coverage area; dynamically tracking the detected obstacle by iteratively determining a monitoring area including the detected obstacle; selecting, from the transmission links, a subset of monitoring links belonging at least partly to the monitoring area and monitoring a perturbation level of the selected monitoring links to determine movement of the mobile obstacle in the coverage area; and dynamically adapting the relay scheme of the network based on the belonging or not belonging of the transmission links between network devices to the selected subset.
    Type: Application
    Filed: January 27, 2012
    Publication date: August 2, 2012
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: PASCAL LAGRANGE, BRICE LE HOUEROU, TRISTAN HALNA DU FRETAY
  • Publication number: 20120050613
    Abstract: The present invention concerns a method of synchronization between devices of a distribution system for distributing video streams of images. The system comprises at least three devices, including a sender and a receiver, wherein a sending device is configured to receive, from a source, a video stream presenting a source image frequency, and a receiving device is configured to control the display, at a display frame rate, of a video stream on a display device. The method comprises obtaining a common target frame rate; adapting, by the devices, a source video stream received from a source, respectively, directly or via a sending device, from the source frame rate to the target frame rate; and adjusting, on each receiver, the display frame rate so as to control a display at said target frame rate.
    Type: Application
    Filed: August 25, 2011
    Publication date: March 1, 2012
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: TRISTAN HALNA DU FRETAY, YACINE SMAIL EL KOLLI, LAURENT FROUIN
  • Patent number: 7855955
    Abstract: A method for managing frames in a global-area communications network comprises a plurality of sub-networks linked to one another by tunnels at the ends of which there are tunnel endpoints, at least one of the sub-networks comprising at least one source device connected to one of said tunnel endpoints through said sub-network. When a given tunnel endpoint receives from a local sub-network, to which said given tunnel endpoint is connected, a frame sent out by a source device in the global-area network, the given tunnel endpoint performs the following steps: obtaining, from said frame, an address of the source device; verifying that the obtained address is included in a first list of addresses comprising addresses associated with source devices connected to remote sub-network or sub-networks distinct from the local sub-network; and in the event of positive verification, discarding said frame.
    Type: Grant
    Filed: October 24, 2008
    Date of Patent: December 21, 2010
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tristan Halna du Fretay, Philippe Boucachard
  • Patent number: 7818448
    Abstract: A method for insertion of information for control of broadcasting of a data stream in a heterogeneous network, the network including an entry sub-network conveying first packets and a basic network conveying second packets. The sub-network is connected to the basic network by an entry node forming the second packets. The node receives first packets from the sub-network, associates an access level with each first packet from a plurality of access levels, as a function of a predetermined policy of association, forms each second packet by enclosing at least a first packet or part thereof into the second packet, the enclosed first packets or part thereof being associated with a same access level, for each second packet, inserts, into a field of the second packet representing the broadcast control information, the same access level, and transmits the formed second packets into the basic network.
    Type: Grant
    Filed: January 9, 2004
    Date of Patent: October 19, 2010
    Assignee: Canon Europa NV
    Inventors: Tristan Halna Du Fretay, Laurent Frouin
  • Publication number: 20100149985
    Abstract: According to the method for balancing a latency of transmission of at least one data content in a communications tree defined in a synchronous communications network, the communications tree comprising a root node to which there is connected a junction terminal which is a convergence terminal in the context of a capture application or divergence terminal in the context of a broadcast application, the communications tree furthermore comprising the leaf nodes to which there are connected capture terminals, for capturing or broadcast terminals, for broadcasting, the root node and the leaf nodes being interconnected by intermediate nodes, the nodes being interconnected by links, steps are performed for: determining, for each node of the communications tree, a maximum value of latency associated with each path going from the node up to leaf nodes in a direction opposite to the junction terminal, and applying to each link at a node, the link running from the node in the direction opposite to the junction termina
    Type: Application
    Filed: December 11, 2009
    Publication date: June 17, 2010
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Pascal Rousseau, Tristan Halna Du Fretay, Yacine El Kolli
  • Publication number: 20090259755
    Abstract: A method is proposed for setting up a communications path between a first communications sub-network and a second communications sub-network by means of an intermediate communications sub-network in an extended communications network. More specifically, to set up the communications path, said intermediate sub-network comprises at least two tunnel end-points and an input tunnel end-point of said intermediate sub-network which performs the following steps of: receiving, from a tunnel of said input tunnel end-point, a relay activation message to set up said path, said message referring to a local relay involving said input tunnel end-point; determining, from said relay activation message, an output tunnel end-point of said intermediate sub-network involved in the local relay; activating the local relay for a part of said path between said first sub-network and said second sub-network transmitting the relay activation message to said output tunnel end-point.
    Type: Application
    Filed: April 3, 2009
    Publication date: October 15, 2009
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Philippe Boucachard, Tristan Halna Du Fretay
  • Publication number: 20060072897
    Abstract: A method for the management of the recording of an audio/video stream within a communications network comprises a step for setting up a first recording connection between a source device and a recording device connected to said communications network. The step for setting up the first recording connection is followed by a step for setting up a second viewing connection between the recording device and a display device also connected to the network, so that a user can observe an audio/video image corresponding to the audio/video stream, on said display device, while the stream is being recorded by the recording device.
    Type: Application
    Filed: October 4, 2005
    Publication date: April 6, 2006
    Inventors: Tristan Halna Du Fretay, Stephane Bizet, Lionel Tocze
  • Publication number: 20050188416
    Abstract: A method for the distribution of an audiovisual signal, in a communications network interconnecting a plurality of terminals, from a source terminal to one or more destination terminals comprises: a step for the detection of an initializing signal; a step for the transmission of the audiovisual signal to a first group of terminals; a step for the sending of indication messages on the transmission of the audio signal to a second group of terminals; a step for the reception of confirmation messages used to determine the terminals of the second group for which the transmission of the audiovisual signal must be maintained; a step to stop the transmission of the audiovisual signals to the terminals of the second group for which the transmission of this signal must not be maintained.
    Type: Application
    Filed: February 9, 2005
    Publication date: August 25, 2005
    Applicant: CANON EUROPA NV
    Inventors: Tristan Halna Du Fretay, Laurent Frouin
  • Publication number: 20040215813
    Abstract: In a method for the insertion of information for the control of the broadcasting of a data stream in a heterogeneous network, the heterogeneous network includes at least one entry sub-network conveying first packets and a basic network conveying second packets. The entry sub-network is connected to the basic network by means of an entry node forming the second packets from at least one sub-part of at least one first packet.
    Type: Application
    Filed: January 9, 2004
    Publication date: October 28, 2004
    Applicant: CANON EUROPA NV
    Inventors: Tristan Halna Du Fretay, Laurent Frouin