A fast approximate algorithm for scaling down digital images in the DCT domain

Authors:
B. K. Natarajan;B. Vasudev
Affiliations:
-;-
Venue:
ICIP '95 Proceedings of the 1995 International Conference on Image Processing (Vol.2)-Volume 2 - Volume 2
Year:
1995

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Abstract

We present a fast approximate algorithm for scaling down an image by a factor of two, when the input and output streams are both in the form of 8/spl times/8 discrete cosine transform (DCT) transform blocks, as with JPEG coded images. Roughly speaking, the algorithm requires 80% fewer operations than the naive algorithm of inverting the transform, scaling in the spatial domain, and transforming the resulting image.