Description
- Abstract:
- This thesis is dedicated to exploring compression methods for large dynamic scenes. The first part presents a case study of compressing aerial video using background modeling and JPEG2000. The concepts used in the case study relate to state of the art compression frameworks and lay down the foundation for the methods used to compress 4-d scenes in the second part. The algebra of random variables and multiresolution analysis are used throughout this thesis as a means of compressing large dynamic data. The second part of thesis presents a novel method to estimate dense scene flow using volumetric and probabilistic 3-d models. The method first reconstructs 3-d models at each time step using images synchronously captured from multiple views. Then, the 3-d motion between two consecutive 3-d models is estimated using a formulation that is the analog of Horn and Schunck’s optical flow method. This particular choice of 3-d model representation allows estimat- ing highly dense scene flow results, tracking of surfaces undergoing topological change and reliably recovering large motion displacements. The benefits of the method and the accuracy of 3-d flow results are demonstrated on recent multi-view datasets. The second goal of this work is to compress and reconstruct 3-d scenes at various time points using the estimated flow. A new method of scene warping is proposed that involves partitioning the optical flow field in regions of coherent motion which are subsequently parametrized by affine transformations. The compression objective of this work is achieved by the low storage requirements of the affine parameters that describe the optical flow field and the efficient reconstruction method through warping.
- Notes:
- Thesis (Ph.D. -- Brown University (2015)
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Citation
Biris, Octavian,
"Compression of 2-d and 3-d Dynamic Scenes"
(2015).
Electrical Sciences and Computer Engineering Theses and Dissertations.
Brown Digital Repository. Brown University Library.
https://doi.org/10.7301/Z0T43RGD
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Electrical Sciences and Computer Engineering Theses and Dissertations
Theses and Dissertations for the Electrical Sciences and Computer Engineering department....