Cisco Technology, Inc.

Wayne Liu

Sijia Chen

Siping Tao

Dong Zhang

Guang Xu

Ling Zhang

Yongze Xu

Ling Zhu

Kai Li

A method, a device and computer readable storage media facilitate providing screen content including a plurality of video frames that are displayed by a computing device. During coding of the screen content, a suitable predictor is found that is used to code pixel blocks from one or more frames. The suitable predictor is found by selecting a pixel block of a current frame, conducting a direction based search by comparing pixel blocks within a search window of a reference frame with the selected pixel block of the current frame to determine whether a match exists, and, in response to a determination that no sufficient match has been found, conducting a feature oriented search by comparing pixel blocks of the reference frame with the selected pixel block of the current frame to find a suitable match based upon a common feature.

Utilizing a search scheme for screen content video coding

Techniques are provided to improve user experience at endpoint devices that are participating in a multipoint screen content sharing session. A server in a multipoint communication system receives video frames from a sending endpoint device in the communication session that involves one or more other endpoint devices that are to receive video frames from the sending endpoint device. The video frames include key reference frames that use either intra-frame prediction or inter-frame prediction based only on other key reference frames. The server stores the key reference frames. When a new receiving endpoint device joins the communication session, the server sends all the stored key reference frames to the new receiving endpoint device. All video frames received from the sending endpoint device are forwarded to existing ordinary receiving endpoint devices. Key reference frames and some, but not all, non-key reference video frames are forwarded to existing low-capacity receiving endpoint devices.

Efficient frame forwarding in large scale real-time screen content sharing meetings

In one embodiment, video is transmitted between a sending device and a receiving device. The sending device is configured to receive adjacent camera views and encode the adjacent camera views independently into video streams. The sending device performs an image analysis on the adjacent camera views in order to generate a projection matrix to relate the adjacent camera views. The projection matrix and the encoded video streams are sent to at least one receiver. The receiver is configured to receive the encoded video streams and the projection matrix relating the encoded video streams. The receiver calculates an aggregate video stream using the projection matrix. The aggregate video stream includes portions of at least two of the encoded video streams. Other receivers may receive the same encoded video streams and generate a different aggregate video stream having a varying size, resolution, or number of views.

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Wayne Liu