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This paper describes methods for tracking using point and line features in affine views to provide fundamental invariance to changes of focal length. It first demonstrates how an earlier method of transfer-based tracking using spatio-temporal matching of point features in a stereo active head is indeed zoom-invariant. In order to also make use of lines the paper then illustrates how the affine tri-and quadrifocal tensors may be applied to tracking with zoom in monocular and stereo systemsdoi:10.1109/iccv.1999.791230 dblp:conf/iccv/HaymanTM99 fatcat:g7h43zeiprcmfh6vtcmr63lz5y