Spatially adaptive video coding

Abstract

A video signal comprises a sequence of source frames to be encoded. A pre-processing stage determines a region of interest for a plurality of the source frames, and spatially adapts each of the plurality of the source frames to produce a respective warped frame. In the respective warped frame, the region of interest comprises a higher spatial proportion of the warped frame than in the source frame. The pre-processing stage supplies the warped frames to an encoder to be encoded into an encoded version of the video signal.

Description

Background technique [0001] In modern communication systems, video signals can be sent from one terminal to another over a medium such as a wired and / or wireless network (usually a packet-based network such as the Internet). For example, video may form part of a live video call such as a VoIP call (Voice over Internet Protocol). [0002] Frames of video are typically encoded at the transmitting terminal by an encoder in order to compress them for transmission over a network. Encoding for a given frame may include intra-coding, where blocks are encoded relative to other blocks in the same frame. In this case, the block is coded in terms of the difference (residual) between the block and neighboring blocks. Alternatively, encoding for some frames may involve inter-coding, where each block in the target frame is encoded relative to a corresponding portion in a previous frame, typically based on motion prediction. In this case, the block is identified in terms of the motion vec...

AI Technical Summary

Problems solved by technology

If the channel conditions will not support the bit rate, this may incur other distortions, e.g. due to packet loss or delay

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