A number of high-quality depth imaged-based rendering (DIBR) pipelines have been developed to reconstruct a 3D scene from several images taken from known camera viewpoints. Due to the specific limitations of each technique, their output is prone to artifacts. Therefore the quality cannot be ensured. To improve the quality of the most critical and challenging image areas, an exhaustive comparison is required. In this paper, we consider three questions of benchmarking the quality performance of eight DIBR techniques on light fields: First, how does the density of original input views affect the quality of the rendered novel views? Second, how does disparity range between adjacent input views impact the quality? Third, how does each technique behave for different object properties? We compared and evaluated the results visually as well as quantitatively (PSNR, SSIM, AD, and VDP2). The results show some techniques outperform others in different disparity ranges. The results also indicate using more views not necessarily results in visually higher quality for all critical image areas. Finally we have shown a comparison for different scene's complexity such as non-Lambertian objects.
Disparity estimation algorithms mostly lack information about the reliability of the disparities. Therefore, errors in initial disparity maps are propagated in consecutive processing steps. This is in particularly problematic for difficult scene elements, e.g., periodic structures. Consequently, we introduce a simple, yet novel confidence measure that filters out wrongly computed disparities, resulting in improved final disparity maps. To demonstrate the benefit of this approach, we compare our method with existing state-of-the-art confidence measures and show that we improve the ability to detect false disparities by 54.2%.
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