Novel Motion Anchoring Strategies for Wavelet-based Highly Scalable Video Compression by Dominic Rüfenacht
Author:Dominic Rüfenacht
Language: eng
Format: epub, pdf
Publisher: Springer Singapore, Singapore
4.5 Summary
In this chapter, we presented the two main motion field operations that will be used throughout this thesis. First, we proposed motion discontinuity aided motion inversion operation, which can be used to map motion fields from one frame to another. A key insight is that this motion field inversion process allows us to readily observe regions that get disoccluded in the target frame. Disoccluded regions are regions that are not visible in the respective reference frame. However, it is quite likely that such regions are visible in another reference frame. The second operation on motion fields, which we refer to as motion inference, is used to compose a motion field that relates the other reference frame with the target frame in a geometrically consistent way. Perhaps surprisingly, this “backward” pointing motion field is inferred from two forward pointing motion fields. The two motion field operations are evaluated in a TFI scenario on a large variety of both challenging synthetic sequences, as well as common natural sequences, where we show superior performance compared to three state-of-the-art TFI schemes.
The motion centric approach to TFI is well adapted to scalable compression schemes, because it allows the motion to be understood as part of a transform that is applied to the frame data; the proposed TFI scheme can then be understood as the inverse transform that would result if high temporal frequency details were omitted. In the next chapter, we present a highly scalable video compression scheme which has BOA-TFI as the main building block.
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