title: Assigning Main Orientation to an EOH Descriptor on Multispectral Images.
abstract: This paper proposes an approach to compute an EOH (edge-oriented histogram) descriptor with main orientation. EOH has a better matching ability than SIFT (scale-invariant feature transform) on multispectral images, but does not assign a main orientation to keypoints. Alternatively, it tends to assign the same main orientation to every keypoint, e.g., zero degrees. This limits EOH to matching keypoints between images of translation misalignment only. Observing this limitation, we propose assigning to keypoints the main orientation that is computed with PIIFD (partial intensity invariant feature descriptor). In the proposed method, SIFT keypoints are detected from images as the extrema of difference of Gaussians, and every keypoint is assigned to the main orientation computed with PIIFD. Then, EOH is computed for every keypoint with respect to its main orientation. In addition, an implementation variant is proposed for fast computation of the EOH descriptor. Experimental results show that the proposed approach performs more robustly than the original EOH on image pairs that have a rotation misalignment.
authors.affiliation: Beijing University of Posts and Teles., School of Electronic Engineering, Rd. Xitucheng 10#, Beijing 100876, China. yli@bupt.edu.cn.
authors.forename: Yong
authors.initials: Y
authors.lastname: Li
authors.affiliation: Beijing University of Posts and Teles., School of Electronic Engineering, Rd. Xitucheng 10#, Beijing 100876, China. 2013140640@bupt.edu.cn.
authors.forename: Xiang
authors.initials: X
authors.lastname: Shi
authors.affiliation: Beijing University of Posts and Teles., School of Electronic Engineering, Rd. Xitucheng 10#, Beijing 100876, China. weilijun@bupt.edu.cn.
authors.forename: Lijun
authors.initials: L
authors.lastname: Wei
authors.affiliation: Beijing University of Posts and Teles., School of Electronic Engineering, Rd. Xitucheng 10#, Beijing 100876, China. buptzjw@bupt.edu.cn.
authors.forename: Junwei
authors.initials: J
authors.lastname: Zou
authors.affiliation: Beijing Anzhen Hospital, Capital Medical University and Beijing Institute of Heart Lung and BloodVessel Disease, Beijing 100029, China. azchenfang@163.com.
authors.forename: Fang
authors.initials: F
authors.lastname: Chen
mesh_terms: D000465:Algorithms; D016208:Databases, Factual; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D010363:Pattern Recognition, Automated / Q000379:methods*
keywords: EOH; descriptor; keypoint; main orientation