DocumentCode
1828118
Title
Wavelet image compression using sub-block DCT
Author
Kondo, Hiroshi ; Kou, Hiroki
Author_Institution
Kyushu Inst. of Technol., Japan
fYear
2001
fDate
10-12 Oct. 2001
Firstpage
327
Lastpage
330
Abstract
A wavelet image compression method using sub-block DCT is presented. The presented method is a hybrid type of DWT and DCT. The sub-block DCT is employed to the DWT-details. DWT-details have usually zero mean and small variance and hence the sub-block DCT method is very efficient. The size of sub-block for DCT is 8×8 pixel for level 1 DWT-details and 4×4 pixel for level 2 DWT-details. The simulation examples show that the presented method gives a better picture quality that of the usual JPEG method.
Keywords
data compression; discrete cosine transforms; discrete wavelet transforms; image coding; visual communication; DWT; discrete wavelet transform; sub-block DCT; wavelet image compression; Discrete cosine transforms; Discrete transforms; Discrete wavelet transforms; Frequency; Image coding; Internet; Mobile communication; Mobile handsets; Pixel; Transform coding;
fLanguage
English
Publisher
ieee
Conference_Titel
Networks, 2001. Proceedings. Ninth IEEE International Conference on
ISSN
1531-2216
Print_ISBN
0-7695-1187-4
Type
conf
DOI
10.1109/ICON.2001.962362
Filename
962362
Link To Document