Abstract
In a light field-based free viewpoint system (LF-based FVV), effective sampling density (ESD) is defined as the number of rays per unit area of the scene that has been acquired and is selected in the rendering process for reconstructing an unknown ray. The concept of ESD has been developed in last 7 years by the authors. It is shown that ESD is a tractable metric that quantifies the joint impact of the imperfections of LF acquisition and rendering. By deriving and analyzing ESD for the commonly used LF acquisition and rendering methods, it is shown that ESD is an effective indicator determined from system parameters and can be used to directly estimate output video quality without access to the ground truth. This claim is verified by extensive numerical simulations and comparison to PSNR. Furthermore, an empirical relationship between the output distortion (in PSNR) and the calculated ESD is established to allow direct assessment of the overall video distortion without an actual implementation of the system. A small-scale subjective user study is also conducted which indicates a correlation of 0.91 between ESD and perceived quality. ESD also has been applied to several problems for evaluation and optimization of FVV acquisition and rendering subsystems. This chapter summarizes an overview of the ESD and its application in evaluation and optimization of FVV systems.
Keywords
- Free viewpoint video
- Light-field rendering
- Light-field acquisition
- Sampling density
- Effective sampling density
- Video quality assessment
- Video signal distortion
- Rendering quality assessment
- Plenoptic function
- Non-uniform signal sampling
- Irregular camera grid
- Free viewpoint video/TV evaluation
- Free viewpoint video/TV optimization
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Shidanshidi, H., Safaei, F., Li, W. (2017). Quality Assessment, Evaluation, and Optimization of Free Viewpoint Video Systems by Using Effective Sampling Density. In: Kondoz, A., Dagiuklas, T. (eds) Connected Media in the Future Internet Era. Springer, New York, NY. https://doi.org/10.1007/978-1-4939-4026-4_2
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