{"title":"Wavelet image compression using sub-block DCT","authors":"H. Kondo, Hiroki Kou","doi":"10.1109/ICON.2001.962362","DOIUrl":null,"url":null,"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/spl times/8 pixel for level 1 DWT-details and 4/spl times/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.","PeriodicalId":178842,"journal":{"name":"Proceedings. Ninth IEEE International Conference on Networks, ICON 2001.","volume":"41 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2001-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"5","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Proceedings. Ninth IEEE International Conference on Networks, ICON 2001.","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/ICON.2001.962362","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 5
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/spl times/8 pixel for level 1 DWT-details and 4/spl times/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.
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