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

Ee-Leng Tan Ee-Leng Tan,Woon-Seng Gan Woon-Seng Gan,Meng-Tong Wong Meng-Tong Wong

doi:10.1109/icalip.2008.4590237

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

Ee-Leng Tan Ee-Leng Tan, Woon-Seng Gan Woon-Seng Gan + Show 1 more

https://doi.org/10.1109/icalip.2008.4590237

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Publication Date: Jul 1, 2008

Citations: 9

Affiliation: Nanyang Technological University, Texas Instruments (United States)

#Discrete Cosine Transform Block #Discrete Cosine Transform + Show 6 more

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Abstract

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.

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