Extracting image orientation feature by using integration operator

Authors:
Xudong Jiang
Affiliations:
School of Electrical and Electronic Engineering, Nanyang Technological University, S1-B1c-109, 50 Nanyang Avenue, Singapore 639798, Singapore
Venue:
Pattern Recognition
Year:
2007

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Abstract

This paper presents an orientation operator to extract image local orientation features. We show that a proper employment of image integration leads to an unbiased orientation estimate, based on which an orientation operator is proposed. The resulting discrete operator has flexibility in the scale selection as the scale change does not violate the bias minimization criteria. An analytical formula is developed to compare orientation biases of various discrete operators. The proposed operator shows lower bias than eight well-known gradient operators. Experiments further demonstrate higher orientation accuracy of the proposed operator than these gradient operators.