Smart rebinning for the compression of concentric mosaic
The concentric mosaic offers a quick solution to construct a virtual copy of a real environment, and to navigate in that virtual environment. However, the huge amount of data associated with the concentric mosaic is a heavy burden for its application. A three-dimensional (3-D) wavelet-based compressor has been proposed in a previous work to compress the concentric mosaic. In this paper, we greatly improve the compression efficiency of the 3-D wavelet coder by a data rearrangement mechanism called "smart rebinning". The proposed scheme first aligns the concentric mosaic image shots along the horizontal direction and then rebins; the shots into multiperspective panoramas. Smart rebinning effectively enhances the correlation in the 3-D data volume, translating the data into a representation that is more suitable for 3-D wavelet compression. Experimental results show that the performance of the 3-D wavelet coder is improved by an average of 4.3 dB with the use of the smart rebinning. The proposed coder outperforms MPEG-2 coding of the concentric mosaic by an average of 3.7 dB.
rebinning compression concentric mosaic multiperspective panorama image-based rendering (ibr) three-dimensional (3-d) wavelet