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Fast image resizing in discrete cosine transform domain with spatial relationship between DCT block and its sub-blocks

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3 Author(s)
Ee-Leng Tan ; Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore ; Woon-Seng Gan ; Meng-Tong Wong

This paper presents a computational scalable approach to resize images by factors of P/Q times R/S in the discrete cosine transform (DCT) domain. Our resizing approach is based on the framework proposed by Mukherjee and Mitra which employs the spatial relationship between a DCT block and its sub-blocks. To simplify integration with block based coders such as JPEG and MPEG, N times N DCT blocks are discussed throughout this work. Our observation of the spatial relationship between a DCT block and its sub-blocks resulted in reduction of the computational cost to resize images. Also, we have suggested using up-sampled DCT blocks smaller than N times N to further reduce computational cost.

Published in:

Audio, Language and Image Processing, 2008. ICALIP 2008. International Conference on

Date of Conference:

7-9 July 2008