Between Two Video Terminals, E.g., Videophone (epo) Patents (Class 348/E7.078)
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Patent number: 11909785Abstract: A method for a video communication system for a rideshare system includes conducting at least a portion of a video communication session involving a passenger using at least one exterior audio/video component on an exterior surface of an AV dispatched to a designated location; and transferring the video communication session to at least one interior audio/video component on an interior of the AV.Type: GrantFiled: December 28, 2021Date of Patent: February 20, 2024Assignee: GM Cruise Holdings LLCInventors: Ajay Alfred, Alexander Willem Gerrese, Aakanksha Mirdha, Jeremy Stephen Juel, Grace Noh, Swarnakshi Kapil
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Patent number: 11901429Abstract: Systems and methods are presented herein that facilitate temporally synchronizing, in real time, a separately sourced high quality audio segment of a live event with a video segment that is generated by a recording device associated with a member of the audience. An A-V Synchronization Application may synchronize a video segment of a live event that is generated from a personal electronic device of an audience member with a high quality audio segment that is separately sourced and generated by professional sound recording equipment at the live event. The result of the temporal synchronization is a high fidelity digital audio visual recording of the live event. In various, the audience member may stream, in real-time, the high fidelity digital audio visual recording to an additional electronic device at a different geo-location. In some examples, narrative audio segments may be also included as part of the high fidelity digital audio visual recording.Type: GrantFiled: August 17, 2022Date of Patent: February 13, 2024Assignee: BYGGE TECHNOLOGIES INC.Inventors: Neil C. Marck, Anthony Sharick
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Patent number: 11871147Abstract: Methods and systems for applying gaze adjustment techniques to participants in a video conference are disclosed. Some examples may include: receiving, at computing system, image adjustment information associated with a video stream including images of a first participant, identifying, for a display layout of a communication application, a location displaying the images of the first participant, determining, based on the received image adjustment information, a location displaying images of a second participant for the display layout, the received image adjustment information indicating that an eye gaze of the first participant being directed toward the second participant, computing an eye gaze direction of the first participant based on the location displaying images of the second participant, generating gaze-adjusted images based on the desired eye gaze direction of the first participant and replacing the images within the video stream with the gaze-adjusted images.Type: GrantFiled: June 9, 2021Date of Patent: January 9, 2024Assignee: Microsoft Technology Licensing, LLCInventors: Eric Chris Wolfgang Sommerlade, Alexandros Neophytou, Sunando Sengupta
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Patent number: 11843898Abstract: User interface (UI) tiles of conference participants are arranged in a UI of conferencing software according to relative locations of those conference participants within a conference room. Positional information and video data are obtained from one or more video capture devices located within a conference room. Relative locations of conference participants within the conference room are determined based on the positional information, such as by defining coordinates for the conference participants within a coordinate system based on the positional information and the video data and determining the relative locations based on the coordinates. Output configured to cause a client application to arrange UI tiles associated with the conference participants is generated according to the relative locations. The output is then transmitted to one or more client devices to cause a UI of conferencing software at each of those client devices to display the UI tiles in the specified arrangement.Type: GrantFiled: September 10, 2021Date of Patent: December 12, 2023Assignee: Zoom Video Communications, Inc.Inventors: Anthony Bao Quoc Hoang, Cynthia Eshiuan Lee, Jeffrey William Smith, Chi-chian Yu
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Patent number: 11750936Abstract: A control device that controls imaging with fisheye cameras disposed on front and rear portions and right and left side portions of a vehicle, the control device comprising: an acquisition unit configured to acquire information regarding a speed of the vehicle; and a control unit configured to control a conversion center position for converting a fisheye image of each of the fisheye cameras into a planar image based on the speed of the vehicle.Type: GrantFiled: March 22, 2022Date of Patent: September 5, 2023Assignee: HONDA MOTOR CO., LTD.Inventor: Yuji Yasui
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Patent number: 11729351Abstract: A virtual presence system includes a display having a structural matrix configured to arrange a plurality of spaced pixel elements. A plurality of spaced pixel elements collectively form an active visual area wherein an image is displayable. At least one image capture device is disposed within the active visual area for capturing an image. The system is able to sense the environment in front of the display and, in response to what is sensed, is able to change one or more attributes of a displayed image, or, is able to change the displayed image or a portion of the displayed image.Type: GrantFiled: March 11, 2022Date of Patent: August 15, 2023Assignee: Nanolumens Acquisition, Inc.Inventors: Richard Craig Cope, Drew Fredrick Meincke, Jorge Perez Bravo
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Patent number: 11722386Abstract: The present application describes a network interface device that acts as an interface between a network service provided by a network service provider and one or more network access devices associated with a particular location and/or entity.Type: GrantFiled: January 6, 2022Date of Patent: August 8, 2023Assignee: CenturyLink Intellectual Property LLCInventors: Glenn Garbelman, Kenchen A. Phillips, Brian Edward Bond, Nathan Edwards
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Patent number: 11706384Abstract: Methods and systems for applying gaze adjustment techniques to participants in a video conference are disclosed. Some examples may include: receiving, at computing system, image adjustment information associated with a video stream including images of a first participant, identifying, for a display layout of a communication application, a location displaying the images of the first participant, determining, based on the received image adjustment information, a location displaying images of a second participant for the display layout, the received image adjustment information indicating that an eye gaze of the first participant being directed toward the second participant, computing an eye gaze direction of the first participant based on the location displaying images of the second participant, generating gaze-adjusted images based on the desired eye gaze direction of the first participant and replacing the images within the video stream with the gaze-adjusted images.Type: GrantFiled: June 9, 2021Date of Patent: July 18, 2023Assignee: Microsoft Technology Licensing, LLCInventors: Eric Chris Wolfgang Sommerlade, Alexandros Neophytou, Sunando Sengupta
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Patent number: 11683443Abstract: The present invention provides significant and much needed improvements in person-to-person interactions within videoconferencing events, by enabling each participant a greater freedom the move around quickly, and change their acoustic perspectives based on their relative positions to other participants, to control who is near to them, and to quickly scan through all participants in a venue to choose participants they like and later to see who liked them. Recent advances in processing power and simulation of binaural sound from monophonic sound simulates distances and azimuth angles as well as aural anatomical comb filtering effects to simulated stereophonic sound and select desirable crowd noises in videoconferencing.Type: GrantFiled: September 6, 2021Date of Patent: June 20, 2023Inventor: Lawrence Au
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Patent number: 11683444Abstract: This disclosure describes a video room system that can generate a video room utilizing a cross-application technique by accessing functions of one application based on user interaction within a separate application. In particular, the disclosed systems can generate a video room that remains open for access by a creator device and invitee devices in a casual come-and-go fashion. The disclosed systems can further generate a video room link that is distributable intelligently to grant access to the video room to invitee devices. The disclosed systems can also automatically surface a video room link to an invitee device based on determining a digital connection between the invitee device and the creator device.Type: GrantFiled: May 24, 2022Date of Patent: June 20, 2023Assignee: WhatsApp LLCInventors: Aby John, Valerie Rose, Priyanka Kodikal, Ryan Andrew Wiggins, Raluca-Elena Podiuc, Charlotte Genevieve Duran, Scott William Ryder
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Patent number: 11665278Abstract: A method, computer system, and a computer program product for filtering a phone call are provided. An incoming phone call to a phone is detected. Call metadata from the incoming phone call is received. The call metadata is compared to entries of a learned relationship filter. The entries of the learned relationship filter are obtained by monitoring behavior of a phone user on the phone during previous calls to the phone and application usage on the phone so that learned relationships to the phone user are identified and saved. The learned relationship filter provides a filtering response. The filtering response is performed to the incoming phone call.Type: GrantFiled: March 10, 2021Date of Patent: May 30, 2023Assignee: International Business Machines CorporationInventors: Gregory M. J. H. Tkaczyk, Eric Jeffery, Shikhar Kwatra
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Patent number: 11601696Abstract: To enable satisfactory decoding processing corresponding to a decoding capability on a reception side. Image data of pictures constituting moving image data are sorted into multiple hierarchies, image data of pictures of each of the sorted hierarchies are encoded, and video data including the encoded image data of the pictures of each of the hierarchies is generated. A container of a predetermined format including the video data is transmitted. The multiple hierarchies are divided into a predetermined number of hierarchy groups, the predetermined number being two or more, and identification information for identifying a hierarchy group to which encoded image data of each picture included in the video data belongs is inserted into a packet as a container of the video data.Type: GrantFiled: August 20, 2021Date of Patent: March 7, 2023Assignee: SONY GROUP CORPORATIONInventor: Ikuo Tsukagoshi
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Patent number: 11587321Abstract: The frame or image of a video stream of a videoconference is divided into a series of segments for analysis. There is a primary grid, which covers the entire frame, and an alternate grid, which is shifted from the primary grid. Each segment is small enough to allow a neural network to efficiently operate on the segment without requiring downsampling. By operating on full resolution images, a participant can be identified at a greater distance from the camera. The entire frame is analyzed at a lower frequency, such as once per five seconds, but each segment containing a participant in the conference is scanned at a higher frequency, such as once per second, to maintain responsiveness to participant movement but also allow the full resolution operation.Type: GrantFiled: October 13, 2020Date of Patent: February 21, 2023Assignee: PLANTRONICS, INC.Inventors: Rommel Gabriel Childress, Jr., Alain Elon Nimri, Stephen Paul Schaefer
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Patent number: 11587295Abstract: A system comprising: a user device, comprising: sensors configured to sense data related to a physical environment of the user device, displays; hardware processors; and a non-transitory machine-readable storage medium encoded with instructions executable by the hardware processors to: place a virtual object in a 3D scene displayed by the second user device, determine a pose of the user device with respect to the physical location in the physical environment of the user device, and generate an image of virtual content based on the pose of the user device with respect to the placed virtual object, wherein the image of the virtual content is projected by the one or more displays of the user device in a predetermined location relative to the physical location in the physical environment of the user device.Type: GrantFiled: October 5, 2021Date of Patent: February 21, 2023Assignee: Meta View, Inc.Inventors: Avi Bar-Zeev, Alexander Tyurin, Gerald V. Wright, Jr.
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Patent number: 11526969Abstract: A multi-spectrum based image fusion apparatus is disclosed, which includes a light acquisition device, an image processor, and an image sensor having five types of photosensitive channels. The five types of photosensitive channels including red, green and blue RGB channels, an infrared IR channel and a full-band W channel. The light acquisition device acquires target light corresponding to incident light. The image sensor converts the target light into an image signal through the RGB channels, the IR channel and the W channel. The image processor analyzes the image signal into RGB color signals and a brightness signal, and fuses the RGB color signals and the brightness signal to obtain a fused image. The collection of the channels based on which the RGB color signals and the brightness signal are obtained includes the five types of photosensitive channels.Type: GrantFiled: January 25, 2018Date of Patent: December 13, 2022Assignee: HANGZHOU HIKIVISION DIGITAL TECHNOLOGY CO., LTD.Inventors: Meng Fan, Hai Yu, Shiliang Pu
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Patent number: 11451692Abstract: Systems and methods for secure video devices are provided. A video device includes a privacy module that can be automatically or manually activated to obscure the field of view of the video device. The video device also includes a visual indicator for indicating when the camera has been activated, in order to alert individuals within view of the camera that the camera is active. The system can automatically detect when a privacy breach occurs (e.g., if an unauthorized user gains access to the camera) and can automatically activate the privacy module in response to the detected privacy breach in order to obscure the field of view of the camera and maintain the privacy of individuals within the field of view of the camera.Type: GrantFiled: October 18, 2019Date of Patent: September 20, 2022Assignee: Roo, Inc.Inventors: Jingren Xu, Maximus Yaney, Dhruv Garg
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Patent number: 11445128Abstract: An intelligent video processing management method may comprise joining a videoconference session with multiple participants via a multimedia multi-user collaboration application, detecting a current central processing unit (CPU) consumption by the multimedia multi-user collaboration application and a current MMCA processor setting, associating each of the participants with an organizational ranking relative to the purpose of the videoconference session, inputting sensor data including the participant's organizational rankings, the current CPU consumption by the multimedia multi-user collaboration application, and the current MMCA processor setting to a trained neural network, outputting from the neural network an optimized boundary detection algorithm selection instruction predicted to adjust performance of the information handling system to meet a preset performance benchmark requirement, during the videoconference session, and applying a virtual background around a boundary of a user of the information handType: GrantFiled: January 24, 2021Date of Patent: September 13, 2022Assignee: Dell Products, LPInventors: Todd E. Swierk, Vivek Viswanathan Iyer
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Patent number: 11442129Abstract: Systems, methods, and computer-executable instructions for identifying a convergence of objects includes receiving, at a device, a first beacon from a beacon transmitter located within a first location. A first location is identified based on the first beacon. A second beacon is received that is transmitted from a wearable worn by a patient. The patient associated with the second beacon is identified. A convergence time and a previous convergence time of the patient and device are determined. An out of compliance event based on the current convergence time and the previous convergence time is determined. An alert is generated based on the out of compliance event. The alert includes the first location.Type: GrantFiled: April 13, 2021Date of Patent: September 13, 2022Assignee: DeCurtis, LLCInventors: Derek Fournier, James Learish, Paul Schottland, Matthew Winans
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Patent number: 11375157Abstract: This disclosure describes a video room system that can generate a video room utilizing a cross-application technique by accessing functions of one application based on user interaction within a separate application. In particular, the disclosed systems can generate a video room that remains open for access by a creator device and invitee devices in a casual come-and-go fashion. The disclosed systems can further generate a video room link that is distributable intelligently to grant access to the video room to invitee devices. The disclosed systems can also automatically surface a video room link to an invitee device based on determining a digital connection between the invitee device and the creator device.Type: GrantFiled: March 9, 2021Date of Patent: June 28, 2022Assignee: WhatsApp LLCInventors: Aby John, Valerie Rose, Priyanka Kodikal, Ryan Andrew Wiggins, Raluca-Elena Podiuc, Charlotte Genevieve Duran, Scott William Ryder
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Patent number: 11272050Abstract: To provide a mobile phone which can be used without hampering convinience in a condition where functions of the mobile phone are switched and can improve operability. The mobile phone includes an optical sensor, a display element, a pixel circuit portion where a plurality of pixels having a plurality of transistors are arranged in matrix, an optical sensor control circuit which is connected to an optical sensor driver circuit for driving the optical sensor and reads a signal from the optical sensor, a display portion control circuit which is connected to a display element driver circuit for driving the display element and outputs an image signal for displaying an image on a display portion, a gradient detection portion for outputting a signal in accordance with a gradient of the mobile phone, and an arithmetic circuit for performing display in the pixel circuit portion by switching image signals output to the display portion control circuit with a signal from the gradient detection portion.Type: GrantFiled: August 2, 2019Date of Patent: March 8, 2022Assignee: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.Inventor: Shunpei Yamazaki
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Patent number: 11190335Abstract: A method for performing pattern detection and alignment on a programmable logic device is disclosed. A word aligner unit, implemented by a hard intellectual property block, is configured to detect a plurality of control characters by recognizing a proper subset of bits that are common among the plurality of control characters. It is determined whether a predetermined number of consecutive control characters has been detected in a frame of data. A boundary location associated with a detected predetermined number of consecutive control characters from the word aligner unit is identified. The frame of data is aligned in response to the boundary location associated with the detected predetermined number of consecutive control characters.Type: GrantFiled: January 23, 2018Date of Patent: November 30, 2021Assignee: Intel CorporationInventors: Boon Hong Oh, Ivan Fu Sun Teh, Chee Seng Tan
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Patent number: 11140393Abstract: A display device that includes an encoder circuit, a decoder circuit and an overdrive circuit is introduced. The encoder circuit includes a prediction circuit, a quantization circuit, and a bitstream coding circuit. The prediction circuit performs a prediction operation on a first image frame to generate a second image frame. The quantization circuit performs a quantization operation on the second image frame based on a quantization parameter to generated a quantized image frame. The bitstream coding circuit encodes the quantized image frame to generate an encoded bit stream. The quantization parameter is determined according to a grey level of a pixel in the second image frame. The decoder circuit decodes the encoded bit stream to generate a reconstructed image frame. The overdrive circuit generates an overdrive image frame to be displayed on a display panel based on a third image frame and the reconstructed image frame.Type: GrantFiled: June 10, 2020Date of Patent: October 5, 2021Assignee: Novatek Microelectronics Corp.Inventors: Hui-Yu Jiang, Heng-Yao Lin, Yen-Tao Liao
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Patent number: 11057626Abstract: A video processing device which generates motion metadata for encoded video comprises a decoder configured to decode frames of an encoded video into image frames; and a processing circuitry configured to execute a motion meta data deriving operation on image frames decoded by the decoder. The motion meta data deriving operation comprises: a dividing function configured to divide a current image frame into a mesh of cells, wherein each cell comprises multiple image pixels, a comparison function configured to determine a metric of change for each cell by comparing pixel data of each cell with pixel data of a correspondingly positioned cell of a previous and/or subsequent image frame, and a storing function configured to store the metric of change for each cell as the motion metadata related to the current image frame.Type: GrantFiled: October 28, 2019Date of Patent: July 6, 2021Assignee: Axis ABInventors: Viktor A Andersson, Moa Leonhardt, Jonas Hakansson
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Patent number: 10819988Abstract: A moving image encoding apparatus that encodes a moving image and generates encoded data includes an extraction unit configured to extract a brightness change direction for each of blocks acquired by dividing the moving image; and a pixel value control unit configured to control pixel values of a locally decoded image based on the brightness change direction extracted by the extraction unit, for each of the blocks acquired by dividing the moving image.Type: GrantFiled: February 20, 2018Date of Patent: October 27, 2020Assignee: KDDI CORPORATIONInventors: Kei Kawamura, Sei Naito
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Patent number: 10713993Abstract: It is an aspect of the present disclosure to provide an image processing apparatus, a display apparatus and a method of controlling of the display apparatus capable of preventing a rapid decrease in the image quality of image data. In accordance with an example aspect of the present disclosure, a display apparatus comprises: a plurality of image processing modules, each image processing module configured to perform an image processing process; a controller configured to output image data processed by any one image processing module of the plurality of image processing modules, based on state information of the plurality of image processing modules; and a display configured to display the output image data.Type: GrantFiled: September 19, 2017Date of Patent: July 14, 2020Assignee: Samsung Electronics Co., Ltd.Inventors: Yong Seok Choi, Do-Hyung Kim, Joon Ho Song, Sang Jo Lee, Won Chang Lee
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Patent number: 10695922Abstract: System and method for improving the shaving experience by providing improved visibility of the skin shaving area. A digital camera is integrated with the electric shaver for close image capturing of shaving area, and displaying it on a display unit. The display unit can be integral part of the electric shaver casing, or housed in a separated device which receives the image via a communication channel. The communication channel can be wireless (using radio, audio or light) or wired, such as dedicated cabling or using powerline communication. A light source is used to better illuminate the shaving area. Video compression and digital image processing techniques are used for providing for improved shaving results. The wired communication medium can simultaneously be used also for carrying power from the electric shaver assembly to the display unit, or from the display unit to the electric shaver.Type: GrantFiled: May 14, 2013Date of Patent: June 30, 2020Assignee: May Patents Ltd.Inventor: Yehuda Binder
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Patent number: 10491681Abstract: A method and a device are provided for enriching a call that is set up between at least a transmitter terminal and a receiver terminal. The method includes a step of the receiver terminal receiving at least one item of enriching information. The enriching method acts as a function of at least one parameter relating to the call to determine at least one playback model for the enriching information. The determined playback model enables the enriching information and a visual stream of the call to be positioned on a display device associated with the receiver terminal. The enriching information and the visual stream of the call are then played back on the receiver terminal in application of the determined playback model.Type: GrantFiled: August 26, 2014Date of Patent: November 26, 2019Assignee: ORANGEInventors: Ghislain Moncomble, Jean-Sebastien Meurisse
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Patent number: 10354678Abstract: Aspects of the disclosure provide a method for collecting sounds associated with surveillance images. The method includes identifying a sound-making surveilled object in the surveillance images, the surveillance images being captured by a camera of a monitoring device; determining whether a sound acquiring device meets a preset condition corresponding to that a signal strength of the sounds collected by the sound acquiring device from the identified surveilled object is greater than a signal strength of the sounds collected by the monitoring device from the identified surveilled object; and, when determining that the sound acquiring device meets the preset condition, controlling the sound acquiring device to collect the sounds from the identified surveilled object.Type: GrantFiled: June 30, 2016Date of Patent: July 16, 2019Assignee: Xiaomi Inc.Inventors: Mingyong Tang, Huayijun Liu, Tao Chen
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Patent number: 10191647Abstract: Generally, a computer implemented group distance learning system including one more servers which serve a group distance learning computer code executable to provide a graphical user interface which by user interaction allows a plurality of client users to be allocated into a plurality of client user groups each user group having access to a common graphic user interface to collaborate in performance of group assignments. Specifically, a group distance learning computer code which implements a graphical user interface accessed in common by a plurality of client users from remote locations to facilitate collaborative group video production.Type: GrantFiled: February 6, 2014Date of Patent: January 29, 2019Assignee: eduPresent LLCInventor: Jeffrey S. Lewis
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Patent number: 9826516Abstract: A method for transmitting downlink control information and a method for generating a codeword for the same are disclosed. In generating a long code having a low code rate, a basic code of which minimum distance between codes is maximized is repeated by a prescribed number of times and bits of the repeated code are adjusted. Therefore, a minimum distance condition between codes of a long code is satisfied and simultaneously the code can be simply generated. Furthermore, control information can be transmitted with a low error rate by using the generated code.Type: GrantFiled: July 17, 2015Date of Patent: November 21, 2017Assignee: LG ELECTRONICS INC.Inventors: Dong Wook Roh, Bong Hoe Kim, Young Woo Yun, Dong Youn Seo, Dae Won Lee, Jung Hoon Lee, Joon Kui Ahn, Ki Jun Kim
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Patent number: 9572019Abstract: Disclosed herein are various embodiments for publishing a service selection set to a device agent on an end-user device and for on-device selection of a service. In some embodiments, a network system publishes a service selection set to an end-user device over a wireless access network, receives a selection set user selection from the end-user device, and provisions one or more network functions based on the selection set user selection.Type: GrantFiled: November 24, 2014Date of Patent: February 14, 2017Assignee: Headwater Partners LLCInventors: Gregory G. Raleigh, James Lavine, Alireza Raissinia
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Patent number: 9549392Abstract: A method and apparatus are disclosed for transmitting notifications to customers. One example method may include identifying a notification event associated with a customer via a customer management module and retrieving a customer record. The method may also include identifying a customer's mobile device via a voice channel preference indicating the mobile device in the customer preference record, and transmitting the notification event to the customer's mobile device based on the voice channel preference.Type: GrantFiled: April 5, 2016Date of Patent: January 17, 2017Assignee: West CorporationInventors: Jennie Dawn Hanson, Jeffrey William Cordell, James K. Boutcher
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Patent number: 8159517Abstract: A mobile terminal with a function for setting an output volume of an audio signal to prevent acoustic shock is disclosed. In the mobile terminal, a receiver is integrated into a speaker. The speaker limits the initial output volume of an audio signal to a predetermined level. The mobile terminal provides a menu for setting an output volume of an audio signal. The menu enables a user to select either to maintain the currently limited volume level or to change to a volume level set for a speaker mode. Since an audio signal received with the connection of an incoming call is output at a predetermined reference volume level, acoustic shock caused by unexpectedly high-level of sound volume can be prevented.Type: GrantFiled: July 7, 2006Date of Patent: April 17, 2012Assignee: Samsung Electronics Co., LtdInventors: Dok-Shin Lim, Kyoung-Ae Lim, Won-Joo Park, Young-Sun Shin, Min-Sun Cho
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Patent number: 8098902Abstract: Video data comprising a plurality of sets of frame data is captured by mobile video data capture device. The video data is processed by a method which comprises: (a) finding a face in each frame of the video, and (b) processing a corresponding set of frame data to: (i) maintain the area of the image occupied by the face substantially constant; and (ii) maintain the apparent direction of light incident upon the face substantially constant; and/or (iii) maintain the apparent color of the face substantially constant.Type: GrantFiled: November 4, 2005Date of Patent: January 17, 2012Assignee: BRITISH TELECOMMUNICATIONS public limited companyInventor: Jeremy M Thorne
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Patent number: 7593744Abstract: A push-to-talk/push-to-video based communication system configured to implement a plurality of games, including group games and methods thereof. A game controller in communication over an access network with a push-to-talk/push-to-video server, and plurality of push-to-talk/push-to-video clients implements group games in the PTT/PTV based communication network. Game controller has a first game control apparatus, a game authentication means, a billing apparatus, a second game control apparatus, and a local storage apparatus. A group management server enables receiving and storing of user information and a presence server maintains presence information.Type: GrantFiled: June 28, 2006Date of Patent: September 22, 2009Assignee: Aricent Inc.Inventor: Sunil Majahan