In a multi-rate digital signal processing system for re-sizing an image in at least two segments using at least two symmetric T-tap digital filters each having T kernel-function weighting coefficients, where T is an odd plural integer, a first one of the segments being characterized by a first plurality of unfiltered pixels and second adjacent one of the segments being characterized by a second plurality of unfiltered pixels, a predetermined one of the unfiltered pixels being common to both the first and the second plurality at the image boundary of the two segments, the improvement comprising a method of seamlessly extending the image across the image boundary, comprising the steps of multiplying the (T-1)/2 of the first plurality and the second plurality of the unfiltered pixels adjacent the predetermined one of the pixels by two times respective ones of the kernel function weighting coefficients for generating the first and second mirrored half kernel intermediate multiplication products; multiplying the predetermined one of the pixels by a center-tap kernel-function weighting coefficient of the digital filter to generate an additional intermediate multiplication product; adding the first mirrored half-kernel intermediate multiplication products and the additional intermediate multiplication product to generate a first segment estimated boundary filtered output pixel; adding the second mirrored half-kernel intermediate multiplication products and the additional intermediate multiplication product to generate a second segment estimated boundary filtered output pixel; and averaging the first segment estimated boundary filtered output pixel and the segment.