Hyperspectral Light Field Stereo Matching
In this paper, we describe how scene depth can be extracted using a hyperspectral light field capture (H-LF) system. Our H-LF system consists of a <inline-formula><tex-math notation="LaTeX">$5 \times 6$</tex-math><alternatives><mml:math><mml:mrow><mml:mn>5</mml:mn><mml:mo>×</mml:mo><mml:mn>6</mml:mn></mml:mrow></mml:math><inline-graphic xlink:href="zhu-ieq1-2827049.gif"/></alternatives></inline-formula> array of cameras, with each camera sampling a different narrow band in the visible spectrum. There are two parts to extracting scene depth. The first part is our novel cross-spectral pairwise matching technique, which involves a new spectral-invariant feature descriptor and its companion matching metric we call bidirectional weighted normalized cross correlation (BWNCC). The second part, namely, H-LF stereo matching, uses a combination of spectral-dependent correspondence and defocus cues. These two new cost terms are integrated into a Markov Random Field (MRF) for disparity estimation. Experiments on synthetic and real H-LF data show that our approach can produce high-quality disparity maps. We also show that these results can be used to produce the complete plenoptic cube in addition to synthesizing all-focus and defocused color images under different sensor spectral responses.