Geometry refinement for light field compression
In geometry-aided light field compression, a geometry model is used for disparity-compensated prediction of light field images from already encoded light field images. This geometry model, however, may have limited accuracy. We present an algorithm that refines a geometry model to improve the overall light field compression efficiency. This algorithm uses an optical-flow technique to explicitly minimize the disparity-compensated prediction error. Results from experiments performed on both real and synthetic data sets show bit-rate reductions of approximately 10% using the improved geometry model over a silhouette-reconstructed geometry model.