Title :
High-Accuracy Stereo Matching Based on Adaptive Ground Control Points
Author :
Chenbo Shi ; Guijin Wang ; Xuanwu Yin ; Xiaokang Pei ; Bei He ; Xinggang Lin
Author_Institution :
Dept. of Electron. Eng., Tsinghua Univ., Beijing, China
Abstract :
This paper proposes a novel high-accuracy stereo matching scheme based on adaptive ground control points (AdaptGCP). Different from traditional fixed GCP-based methods, we consider color dissimilarity, spatial relation, and the pixel-matching reliability to select GCP adaptively in each local support window. To minimize the global energy, we propose a practical solution, named as alternating updating scheme of disparity and confidence map, which can effectively eliminate the redundant and interfering information of unreliable pixels. The disparity values of those unreliable pixels are reassigned with the information provided by local plane model, which is fitted with GCPs. Then, the confidence map is updated according to the disparity reassignment and the left-right consistency. Finally, the disparity map is refined by multistep filers. Quantitative evaluations demonstrate the effectiveness of our AdaptGCP scheme for regularizing the ill-posed matching problem. The top ranks on Middlebury benchmark with different error thresholds show that our algorithm achieves the state-of-the-art performance among the latest stereo matching algorithms. This paper provides a new insight toward high-accuracy stereo matching.
Keywords :
image colour analysis; image matching; image segmentation; image texture; stereo image processing; AdaptGCP; adaptive ground control points; alternating updating scheme; color dissimilarity; confidence map; disparity reassignment; disparity values; error thresholds; fixed GCP-based methods; high-accuracy stereo matching scheme; ill-posed matching problem; left-right consistency; local support window; multistep filers; pixel-matching reliability; spatial relation; unreliable pixels; Cost function; Educational institutions; Equations; Image color analysis; Mathematical model; Reliability; Stereo matching; alternating updating; confidence map; ground control points; weighted median filter;
Journal_Title :
Image Processing, IEEE Transactions on
DOI :
10.1109/TIP.2015.2393054