Abstract: In this paper, a novel method for image orientation angle determination is proposed. The method is based on the use of parameters of scattering ellipse of an image gradient field. Various problems with application of the proposed technique are considered. The results of the experiments for determining the predominant direction of an image are presented. Three methods of image orientation angle (OA) estimation are compared. It is shown that the method based on scattering ellipse technique is more precise than the histogram-based methods. The term of the "backlash" of image rotation algorithms is submitted and a method for “backlash” estimation is proposed. The “backlash” can be used for determination of the quality of arbitrary rotation algorithm. It is also shown that the proposed technique can be applied to the problems related to the Horizon line tracking.

Keywords: Image registration, orientation angle, directionality, regularity, gradient, rotation, scattering ellipse.

ACM Classification Keywords: Image Processing and Computer Vision

Link:

ORIENTATION ESTIMATION WITH APPLICATIONS TO IMAGE ANALYSIS AND REGISTRATION

David Asatryan, Karen Egiazarian, Vardan Kurkchiyan

http://www.foibg.com/ijita/vol17/ijita17-4-p01.pdf