# US 2019/0320001 A1 · Method and device for generating a description file, and corresponding streaming method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0320001 A1 - Document ID: US20190320001A1 - Status: Published application - Kind: A1 - Application number: 16/453,738 - Filed: 2019-06-26 - Published: 2019-10-17 - Earliest claimed: 2012-09-14 - Assignees: Canon Kabushiki Kaisha - Applicants: Canon Kabushiki Kaisha - Inventors: Franck DENOUAL; Frédéric MAZE; Hervé LE FLOCH - Web page: https://patentgrep.com/patent/US20190320001A1 ## CPC - H04N 21/64322: {IP} - G11B 27/034: on discs (G11B27/036, G11B27/038 take precedence) - H04L 65/756: adapting media to device capabilities - H04N 5/76: Television signal recording - H04N 19/25: with scene description coding, e.g. binary format for scenes [BIFS] compression - H04N 21/64792: {Controlling the complexity of the content stream, e.g. by dropping packets (intermediate media network packet handling H04L65/765; proxy provisioning conversion or adaptation for reducing the amount or size of exchanged application data H04L67/5651; negotiation of resources in wireless networks H04W28/16)} - H04N 21/845: Structuring of content, e.g. decomposing content into time segments - H04N 21/85406: {involving a specific file format, e.g. MP4 format} - H04N 21/8583: {by creating hot-spots} - H04N 19/33: in the spatial domain - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract The present invention relates to a method and device for generating a description file about a video sequence at a server device for a client device, to retrieve a video segment and containing a region of interest. The method comprising for each video segment, determining a time interval during which the detected region of interest is spatially included in a same frame region in the video sequence; and generating a description file comprising spatial information describing the frame region and temporal information describing a duration at least equal to the determined time interval. ## Claims ### Claim 1 A communication apparatus for transmitting a video having a plurality of image frames to another communication apparatus, the communication apparatus comprising: a reception unit configured to receive from the another communication apparatus a request for description data; a first transmission unit configured to transmit, to the another communication apparatus which transmits the request for description data received by the reception unit, description data including first positional information indicating a spatial position of a partial region in a first image frame among the plurality of image frames; and a second transmission unit configured to transmit image data which is encapsulated in order to allow an independent transmission of an image of the partial region to the another communication apparatus based on a request from the another communication apparatus which receives the description data transmitted by the first transmission unit, wherein the first positional information is represented by top left corner position followed by width and height. ### Claim 2 (depends on 1) The communication apparatus according to claim 1, wherein the description data includes second positional information indicating a spatial position of a partial region in a second image frame among the plurality of image frames. ### Claim 3 (depends on 1) The communication apparatus according to claim 1, further comprising: a detection unit configured to detect an object from an image frame of the video, and a generation unit configured to generate the description data based on a detection result obtained by the detection unit. ### Claim 4 (depends on 1) The communication apparatus according to claim 1, further comprising: a detection unit configured to detect an object from an image frame of the video; a specifying unit configured to specify a time period during which the detected object is spatially included in a same frame region of the video; and a generation unit configured to generate the description data based on the time period specified by the specifying unit. ### Claim 5 (depends on 1) The communication apparatus according to claim 1, wherein the description data is Media Presentation Description defined by MPEG-DASH. ### Claim 6 (depends on 3) The communication apparatus according to claim 3, wherein the first positional information included in the description data is coordinate data representing the spatial position of the partial region. ### Claim 7 A communication method to transmit a video having a plurality of image frames from a first communication apparatus to another communication apparatus, wherein the first communication apparatus: receive, by a reception unit, from the another communication apparatus a request for description data; transmit, by a first transmission unit, to the another communication apparatus which transmits the request for description data received by the reception unit, description data including first positional information indicating a spatial position of a partial region in a first image frame among the plurality of images frames; and transmit, by a second transmission unit, image data which is encapsulated in order to allow an independent transmission of an image of the partial region to the another communication apparatus based on a request from the another communication apparatus which receives the description data transmitted by the transmission unit, wherein the first positional information is represented by top left corner position followed by width and height. ### Claim 8 (depends on 7) The communication method according to claim 7, wherein the description data includes second positional information indicating a spatial position of a partial region in a second image frame among the plurality of image frames. ### Claim 9 (depends on 7) The communication method according to claim 7, further comprising: detect, by a detection unit, an object from an image frame of the video; and generate, by a generation unit, the description data based on a detection result obtained by the detection unit. ### Claim 10 (depends on 8) The communication method according to claim 8, further comprising: detect, by a detection unit, an object from an image frame of the video; specify, by a specifying unit, a time period during which the detected object is spatially included in a same frame region of the video; and generate, by a generation unit, the description data based on the time period specified by the specifying unit. ### Claim 11 (depends on 7) The communication method according to claim 7, wherein the description data is Media Presentation Description defined by MPEG-DASH. ### Claim 12 (depends on 9) The communication method according to claim 9, wherein the first positional information included in the description data is coordinate data representing the spatial position of the partial region. ### Claim 13 A communication apparatus that receives a video having a plurality of image frames from another communication apparatus, the communication apparatus comprising: a transmission unit configured to transmit to the another communication apparatus a request for description data; a reception unit configured to receive, from the another communication apparatus which receives the request for description data transmitted by the transmission unit, description data including first positional information indicating a spatial position of a partial region in a first image frame among the plurality of image frames; and wherein the transmission unit is further configured to transmit a request for the independent transmission of an image of the partial region determined in the first image frame, and wherein the first positional information is represented by top left corner position followed by width and height. ### Claim 14 (depends on 13) The communication apparatus according to claim 13, wherein the description data includes second positional information indicating a spatial position of a partial region in a second image frame among the plurality of image frames. ### Claim 15 (depends on 1) The communication apparatus according to claim 1, wherein the description data is Media Presentation Description defined by MPEG-DASH. ### Claim 16 A communication method to receive, by a communication apparatus, a video having a plurality of image frames from another communication apparatus, wherein the communication apparatus: transmit, by a transmission unit, to the another communication apparatus a request for description data; receive, by a reception unit, from the another communication apparatus which receives the request for description data transmitted by the transmission unit, description data including first positional information indicating a spatial position of a partial region in a first image frame among the plurality of image frames; and transmit, by the transmission unit, a request for the independent transmission of an image of the partial region determined in the first image frame, wherein the first positional information is represented by top left corner position followed by width and height. ### Claim 17 (depends on 16) The communication apparatus according to claim 16, wherein the description data includes second positional information indicating a spatial position of a partial region in a second image frame among the plurality of image frames. ### Claim 18 (depends on 1) The communication apparatus according to claim 1, wherein the description data is Media Presentation Description defined by MPEG-DASH. ### Claim 19 (depends on 7) A computer-readable storage medium storing instructions of a computer program for implementing a method according to claim 7. ### Claim 20 (depends on 16) A computer-readable storage medium storing instructions of a computer program for implementing a method according to claim 16.