Abstract: Video send and receive capabilities of participants are determined by the respective machines determining available combinations, as well as preferences for the receivers. Receiver capabilities are forwarded to the source for computation of negotiated video capabilities through a logic intersection of the determined capabilities based on desired number of streams and resolutions. If a resolution of a send capability exists within the receive capability, the highest frame and/or bit rate may be selected for transmission.

Abstract: A subject captured by a camera may be affected by environmental lighting provided by nearby light sources and the sun or moon, which may cause underexposure or overexposure of the image or aesthetically displeasing color tones. Image processing and camera adjustments may mitigate some imaging problems with limited effect and introduce undesirable side effects. A lighting array may be devised to expose the subject to various types of light (e.g., white light comprising full spectrum illumination and red, green, and blue lights comprising partial spectrum illumination) to resolve lighting problems in a more effective manner. Moreover, the lighting array may be responsively controlled to adjust the subject image with respect to one or more target spectra specifying desirable colors for the subject image. The lighting array may be iteratively controlled, e.g. by a gradient descent algorithm, for incrementally adjusting parameters with respect to proximate target spectra for the image.

Abstract: The claimed subject matter provides systems and/or methods that facilitate describing, communicating, utilizing, etc. a frame dependency structure in connection with real time video communication. For example, a protocol can be employed to communicate the dependency structure from a sender to a receiver. Moreover, a mechanism on a receiver side can detect frame(s) that will be rendered with artifacts if displayed due to previous frame loss; this mechanism can leverage receiver side knowledge concerning the dependency structure of the of the frames.

Abstract: A video communication system may include a computer program that implements a feedback control process for automatically controlling a light. The feedback control process may include receiving an image from a video camera and determining an initial difference between the received image and a stored image. For example, the feedback control process may determine, on a pixel-by-pixel basis, whether the color and intensity of a facial region in the captured image is sufficiently close to the color and intensity of a facial region in the stored image. If the difference between the captured image and the stored image exceeds a threshold, the feedback control process includes transmitting an optimization instruction to the light. This optimization instruction, when performed by the light, decreases the difference between the received image and the stored image.

Abstract: During remote communication session, there can be situations where information needs to be sent at a high resolution. Sending information at a high resolution allows for the capture of detail that can be lost without the use of a high resolution. A web camera can obtain information in both a higher resolution and standard resolution. A sending component can send this information encoded with markers that allow a receiving component to process and display the information.

Abstract: An error correction system determines a level of error correction protection to apply to a frame of video data to be transmitted by a sending endpoint to a receiving endpoint based on the predicted impact of packet loss as well as the importance of the frame based on inter-frame dependencies, frame size, packet loss probability, historical packet loss pattern, central processing unit (CPU) load, and available network bandwidth. At the receiving endpoint, when packet loss is detected for a particular frame, the receiving endpoint will attempt to recover the frame using protection packets received along with the video data.

Abstract: Aspects of the present invention are directed at improving the quality of a video stream that is transmitted between networked computers. In accordance with one embodiment, a method is provided that dynamically modifies the properties of a video stream based on network conditions. In this regard, the method includes collecting quality of service data that describes the network conditions that exist when the video stream is being transmitted. Then, the amount of predicted artifact in the video stream is calculated using the collected data. In response to identifying a triggering event, the method modifies the properties of the video stream to account for the network conditions.

Abstract: A method and apparatus for performing measurement-based admission control using peak rate envelopes is disclosed. A peak rate envelope estimator that uses empirical traffic envelopes of the aggregate traffic flow to allocate resources. Connection requests from the user are accepted or denied based upon the empirical traffic envelopes of the aggregate traffic flow.