access icon free Invariant foreground occupation ratio for scale adaptive mean shift tracking

The mean shift algorithm has been introduced successfully into the field of computer vision to be an efficient approach for visual tracking but the tracker has been awkward in handling the scale change of the object. This study addresses the scale estimation problem of the mean shift tracker, and proposes a novel method which is based on invariant foreground occupation ratio to solve this problem. The foreground occupation ratio is defined as the proportion of the foreground pixels in an image region. By taking an analysis of the foreground occupation ratio, the authors obtain its three simple properties. With its property of scale invariance, an iterative approximation approach is employed to estimate the scale of the foreground in the current image. The scale value is modified by a weighting function, and it is adjusted along the two axes with respect to the width and the height of the target. The scale estimation algorithm is then employed in the mean shift tracker to obtain the ability of scale adaptation for tracking. Experimental results show that, using the authors method for object scale estimation, the mean shift tracker performs well in tracking the target efficiently when its scale continuously changes.

Inspec keywords: approximation theory; computer vision; image resolution; object tracking; iterative methods

Other keywords: computer vision; scale invariance; scale adaptive mean shift tracking algorithm; foreground pixel proportion; iterative approximation approach; scale estimation; visual tracking; weighting function; image region; invariant foreground occupation ratio; object scale estimation problem

Subjects: Optical, image and video signal processing; Interpolation and function approximation (numerical analysis); Computer vision and image processing techniques; Interpolation and function approximation (numerical analysis)

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Errata
An Erratum has been published for this content:
Erratum: Invariant foreground occupation ratio for scale adaptive mean shift tracking