Rotated Haar-Like features at generic angles for objects detection

Abstract

This paper propose a new approch to detect rotated object at distinct angles using the Viola-Jones detector. Our idea is based on three key points: The first is to propose a method allowing finding possible angles to rotate a normal Haar-Like feature, without destroy its sides. The tangent of each angle equal to an rational number i.e. each angle equal to arctan(Y/X) where Y and X are integers. The second point is manifested by the use of this rational number to determine the pixels forming the sides of the feature. In the latter, we propose a solution that makes use of this rational number to approximate the Integral image of a rotated feature at a generic angle.