Light Field Stitching Targeting Focal Length Inconsistency
Pei Wang, Xin Jin, Qionghai Dai · 2019
Focal length inconsistency is a common problem in capturing multiple light fields (LFs), which reduces the accuracy in feature matching and LF registration, and limits the quality of LF stitching. In this paper, a novel method is proposed to stitch the LFs captured at different focal length accurately. First, refocus matching is proposed to find the best-matched-focused regions in the focal stack to improve the quality of feature matching. Then, depth distances and refocusing features are exploited to register central sub-aperture images (CSI) to handle focal length variation. Finally, CSI-based 4D warping is applied to preserve the LF angular consistency. Experimental results show that the proposed method outperforms the existing approaches obviously in terms of the stitched LFs and the coherence in epipolar plane image (EPI), especially for the LFs with the focal length inconsistency.