Abstract:
Compression of an image is performed based on prediction of target blocks of an image from candidate source blocks of the image. Heuristics are used for identifying the candidate source blocks, for example, source blocks are selected from within a cluster of similar blocks obtained by K-means clustering. For each target block, a region adjacent to the target block is identified and a set of candidate source blocks along with candidate source regions adjacent to the candidate source blocks are identified. The candidate source regions are ranked based on the differences between the candidate source regions and the target source region. Each candidate source block is described using its rank and residual information describing differences between the candidate source block and the target block. The candidate source block that can be described using a minimum amount of information is selected for predicting the target block.
Abstract:
A method and apparatus are described including multicasting a plurality of data units and multicasting a request for acknowledging receipt of the plurality of data units, receiving signals responsive to the request. Also described are a method and apparatus including receiving a multicast request to acknowledge receipt of data, determining if a response to the request is required, determining status of the data, preparing the response based on the determining acts and transmitting the response.
Abstract:
Message formats and apparatus are described that reserve access to a communication medium in a multicast system. A first message, a multicast request-to-send message, includes a duration field having information representing the reserved time for a communication medium, multicast receiver and transmitter address fields, and bits that specifies a destination that is expected to reply to the multicast digital message. The bits that specify a destination can be extended to a plurality of fields that each contain different destination identifiers. Example destination identifiers include association identifiers or media access control addresses. Alternately, the bits that specify a destination can have a first field containing an offset and a second field indicating destinations with respect to the offset. A second message includes a duration field and multicast receiver and transmitter address fields. The second message is used to cancel a data transmission resulting from a multicast request-to-send message.
Abstract:
A method and system enables sharing content between a plurality of users over a communications network. A link to content that has been shared by a user is selected, the link includes at least one access characteristic defining a set of users able to access the content. A request signal including the at least one access characteristic associated with the content and at least one user characteristic associated with a requesting user over the communications network is transmitted for receipt by an authorization processor. A level of access available is determined for the content by comparing the at least one access characteristic and the at least one user characteristic in the request signal with a source of content specific authentication information including data representing content-specific access levels. Access to the requested content is provided via an internet interface to an output device in accordance with the determined level of access.
Abstract:
A method and system for providing secure, anonymous access to a wireless local area network, including configuring an access point to drop packets except packets exhibiting an URL access protocol like HTTP and HTTPS, intercepting a URL access request by an access point from a mobile device via a web browser, re-directing the URL access request to a web server by the access point generating a security key by one of the access points and the web server, communicating the generated security key to the said web server securely by the access point or vice versa and setting the security key by the access point is described. A mobile device including means for forwarding a request for secure access to a wireless local area network via a URL access request, means for receiving a mobile code or a signal for displaying a security key and means for setting the security key is also described.
Abstract:
A health information services provider (HISP) application includes a controller, a transaction engine, a data encryption engine, an authentication engine, a user interface engine and a registration engine. The controller manages the core functions and transmission to the different components of the HISP application. The transaction engine routes messages and requests for joining a grid. The data encryption engine encrypts or decrypts messages. The authentication engine verifies messages. The user interface engine generates a user interface for exchanging healthcare information between providers. The registration engine registers providers to exchange healthcare information with other providers.
Abstract:
A method and apparatus are described including buffering data to be transmitted, transmitting data retrieved from a buffer via a datagram protocol, receiving a request for retransmission of data, determining if the requested data is in the buffer and retransmitting the requested data via a protocol that provides end-to-end acknowledgement of data and error recovery.
Abstract:
A system and method for managing healthcare information is disclosed. The data servers each include a data manager that comprises a controller, a grid engine, applications, an application manager and a user interface engine. The controller manages the core functions and the transmission of data between data manager components. The grid engine manages information sent between data servers. The applications are applications that are created by the user or downloaded as third-party applications. The application manager manages the creation and communication between applications. The user interface engine generates user interfaces for displaying the applications and collecting clinical trial data.
Abstract:
A method and apparatus are described including scanning a channel, generating a report for the scanned channel, transmitting the channel report to an associated access point and receiving a channel assignment responsive to said channel report. Also described are a method and apparatus including scanning a channel, generating a first channel report, receiving a second channel report from an associated client, transmitting the first channel report and the second channel report to a server, receiving a channel assignment message from the server responsive to the first and second channel reports and transmitting the channel assignment message to the associated client. Further described are a method and apparatus including receiving a channel report from an associated access point, building an interference graph responsive to the channel report, determining channel assignments based on the interference graph and transmitting a channel assignment message to the associated access point.
Abstract:
A method and apparatus are described including multicasting a medium reservation message and receiving a response to the medium reservation message. Also described are a method and apparatus including receiving a medium reservation message, determining if a medium is idle and transmitting a response to the medium reservation message responsive to the determination. Further described are a method and apparatus including receiving a medium reservation message, determining if a received network allocation vector in the medium reservation message has a value greater than a current network allocation vector, determining if transmission over a medium during a time interval is detected and resetting the current network allocation vector responsive to the determination of transmission. Yet further described are a method and apparatus including receiving a response to a medium reservation message, determining if a network allocation vector in the response is greater than a current network allocation vector and updating the current network allocation vector responsive to the determination.