Efficient Schemes for Compressed-Domain Image Resizing

Do Nyeon KIM  Yoonsik CHOE  K.R. RAO  

Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E92-A    No.2    pp.556-562
Publication Date: 2009/02/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E92.A.556
Print ISSN: 0916-8508
Type of Manuscript: PAPER
Category: Image
Keyword: 
compressed domain processing,  DCT,  JPEG,  MPEG,  convolution,  downsampling,  filtering,  upsampling,  

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Summary: 
Fast schemes for compressed-domain image size change, are proposed. Fast Winograd DCTs are applied to resizing images by a factor of two to one. First, we speed up the DCT domain downsampling scheme which uses the bilinear interpolation. Then, we speed up other image resizing schemes which use DCT lowpass truncated approximations. The schemes proposed here reduce the computational complexities significantly, while there is no difference in the overall quality of the images compared to previous works.