DocumentCode
2869486
Title
Discrete cosine transform filtering
Author
Chitprasert, B. ; Rao, K.R.
Author_Institution
Compression Labs. Inc., San Jose, CA, USA
fYear
1990
fDate
3-6 Apr 1990
Firstpage
1281
Abstract
Circular convolution-multiplication relationships for the discrete cosine transform (DCT) that are similar to those for the discrete Fourier transform (DFT) are developed. The relations are valid if the filter frequency response is real and even. Two fairly simple relations are developed. The multiplication of the DCT of signal sequence and the DFT of filter sequence results in circular convolution of the folded signal sequence and the filter sequence. Thus, it can be used to filter an image in the frequency domain as an approximation of circular convolution in the spatial domain
Keywords
filtering and prediction theory; picture processing; transforms; DCT filtering; DFT; approximation; circular convolution; discrete Fourier transform; discrete cosine transform; filter frequency response; filter sequence; frequency domain; image compression; multiplication; signal sequence; spatial domain; Convolution; Discrete Fourier transforms; Discrete cosine transforms; Filtering; Filters; Frequency domain analysis; Frequency response; Image coding; Low pass filters; Marine vehicles;
fLanguage
English
Publisher
ieee
Conference_Titel
Acoustics, Speech, and Signal Processing, 1990. ICASSP-90., 1990 International Conference on
Conference_Location
Albuquerque, NM
ISSN
1520-6149
Type
conf
DOI
10.1109/ICASSP.1990.115606
Filename
115606
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