Pilot signal transmission sequences and methods are described for use in a multi-sector cell. Pilots in different sectors are transmitted at different known power levels. In adjacent sectors a pilot is transmitted while no pilot is transmitted in the adjoining sector. This represents transmission of a NULL pilot signal. A cell NULL is also supported in which NULL pilots are transmitted in each sector of a cell at the same time. Multiple pilot signal measurements are made. At least two channel quality indicator values are generated from measurements corresponding to at least two pilot signals of different power levels. The two values are transmitted back to the base station which uses both values to determine the transmit power required to achieve a desired SNR at the wireless terminal. The wireless terminal also reports information indicating its location to a sector boundary.

Pilot signals for use in multi-sector cells

A system is provided that automatically digitally captures lecture presentation slides and speech and stores the data in a memory This system also prepares this information for Internet publication and publishes it on the Internet for distribution to end-users The system generally comprises three main functions: (1) capturing the lecture and storing it into a computer memory or database, (2) generating a transcript from the lecture and the presentation slides and automatically summarizing and outlining the transcripts, and (3) publishing the lecture slides image data, audio data, and transcripts on the Internet for use by client computers The system synchronizes the slide image data, audio data and the transcripts, and the clients can view and search the published lecture presentation from a slide image projector to a digital camera for digital image data capture

Method and system for the storage and retrieval of web-based education materials

A result higher resolution (HR) image of a scene given multiple, observed lower resolution (LR) images of the scene is computed using a Bayesian estimation image reconstruction methodology. The methodology yields the result HR image based on a Likelihood probability function that implements a model for the formation of LR images in the presence of noise. This noise is modeled by a probabilistic, non-Gaussian, robust function. The image reconstruction methodology may be used to enhance the image quality of images or video captured using a low resolution image capture device. Other embodiments are also described and claimed.

Computing a higher resolution image from multiple lower resolution images using model-based, robust bayesian estimation

The imaging system that is described below is an image streaming system which is different from traditional compression systems. It eliminates the necessity to store a compressed version of the original image, by streaming ROI data using the original stored image. The imaging system of the present invention also avoids the computationally intensive task of compression of the full image. Instead, once a user wishes to interact with a remote image, the imaging server performs a fast preprocessing step in near real time after which it can respond to any ROI requests also in near real time. When a ROI request arrives at the server, a sophisticated progressive image encoding algorithm is performed, but not for the full image. Instead, the encoding algorithm is performed only for the ROI. Since the size of the ROI is bounded by the size and resolution of the viewing device at the client and not by the size of the image, only a small portion of the full progressive coding computation is performed for a local area of the original image. This local property is also true for the client. The client computer performs decoding and rendering only for ROI and not the full image. This real time streaming or Pixels-On-Demand™ architecture requires different approaches even to old ideas. For example, similarly to some prior art, the present imaging system is based on wavelets. But while in other systems wavelet bases are selected according to their coding abilities, the choice of wavelet bases in the present imaging system depends more on their ability to perform well in the real time framework. The system of the present invention supports several modes of progressive transmission: by resolution, by accuracy and by spatial order.

System and method for transmitting a digital image over a communication network

A method and system providing wireless personal telepresence facilitating collaboration by two or more persons, each in different locations, on a task at one of the locations and requiring visualization by multiple persons. A portable wireless unit captures/transmits video depicting the technician's first-hand field of view while keeping her hands free to perform the task. The expert employs a management console for visualization of the task being performed by the technician while communicating in real time with the technician. The management console also provides control over video and audio functions including record, playback, freeze frame and image attributes. Communication between the two persons is accomplished by exchanging digitally compressed video and audio via a voice or data network, either public or private. A community server augments the system by supporting three or more participants and enabling communication across public networks.

Wireless telepresence collaboration system

An imaging system and method for alleviating perceptional problems of a viewer during the transmission and display of high resolution still images on a video system is disclosed. Through modifications to an encoder and decoder within the imaging system, the viewer may select a still image or portion thereof from a video image sequence for viewing. The imaging system and method ameliorate perceptional delays in displaying the lengthy high resolution still image by immediately displaying a lower-resolution, shorter-length video image frame corresponding to the still image. The lower resolution video image being displayed is then updated and refined with the image data from the high resolution still image as it is received.

Motion and still video picture transmission and display

A method and apparatus for establishing a requested communication session between two terminals (A, B) over a given physical channel, wherein the session requires the determination of session parameters before the session can be executed. It is determined (402) by means of at least one session key, whether any session parameters for a previous session between the terminals have been stored in the terminals. If so, the stored session parameters are retrieved (408), such that the requested session can be executed (410) based on the retrieved session parameters. In this way, delays involved with the establishment of sessions requiring the determination of parameters, e.g. in multimedia calls, can be reduced.

A method and apparatus for establishing a communication session between two terminals

An improved imaging system (40) and method for providing increased viewer control over the operating parameters of the imaging system (40) is disclosed. Viewer control is facilitated by including a backchannel (72) within the imaging system (40), whereby a viewer may adjust spatial and temporal resolution, quantization and other operating parameters of the video transmission.

Imaging system and method for interactive control of image quality

The invention provides management of alternative services in a communications system (1). A user equipment (300) requests a primary service at the communications network (10) during the setup of a communications session. In addition, at least one possible alternative service to use if the primary service is unavailable is suggested. Radio performance and signaling quality of the bearers of the primary and alternative service(s) are monitored. If the quality deteriorates, the network (10) issues a service change to a less quality demanding alternative service. If the quality subsequently improves, the network (10) can issue a fallback reversion, thus, changing service to a more preferred service, typically the requested primary service.

Alternative service management

A communication device and method provide selective control of a level of buffering of at least one data stream. The communication device includes a jitter buffer (202), a jitter buffer control unit (204) and a user interface (206). An instruction received via an input to a user interface (206) indicates a jitter buffer strategy (510), such as enabling a jitter buffer or setting a size of a jitter buffer, based on the user input. The control unit (204) sets the buffer strategy based in the instruction, and a data stream transmitted via a packet-switched network is received (530) and buffered for play out based on the buffer strategy (540).

Bo Burman

Papers

Motion and still video picture transmission and display

A method and apparatus for establishing a communication session between two terminals

Imaging system and method for interactive control of image quality

Alternative service management

Method for manually optimizing jitter, delay and synch levels in audio-video transmission