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Image Downsizing and Upsizing Scheme in the Compressed Domain Using Modified IDCT  

서성주 (고려대학교 전자공학과)
이명희 (고려대학교 전자공학과)
오상욱 (고려대학교 전자공학과)
설상훈 (고려대학교 전자공학과)
Publication Information
Journal of Broadcast Engineering / v.8, no.1, 2003 , pp. 30-36 More about this Journal
Abstract
According to an evolution of image and video compression technologies, most digital images are in the compressed form. Resizing of these compressed images have various applications such as transmission of resized image according to varying bandwidth, content adaptation for display purpose and etc. Discrete Cosine Transform (DCT) is the most popular transformation for image compression. Recently, several researches have been performed to obtain the reconstructed image of original size in the DCT domain after downsampling and upsampling in the DCT domain. Main focus of these researches is to improve quality of the reconstructed image after downsampling and upsampling in the DCT domain In this paper, we present an modified IDCT method to downsize DCT-encoded image. Furthermore, we propose an efficient scheme for image downsampling and upsampling in the DCT domain With these modified IDCT method. The proposed scheme Provides higher PSNR values than the existing schemes In terms of the reconstructed image after halving and doubling in the DCT domain.
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