A New Quality Improving Scheme for VQ Decompressed Images Based on DWT

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Title:	A New Quality Improving Scheme for VQ Decompressed Images Based on DWT
Authors:	周永振;Chou, Yung-Chen;Lo, Ya-Hsin;Lo, Ya-Hsin;沈肇基;Shen, Jaui-Ji
Contributors:	資訊工程學系
Date:	2013-03
Issue Date:	2013-07-11 06:17:58 (UTC+0)
Abstract:	The better compression rate can be achieved by the traditional vector quantization (VQ) method, and the quality of the recovered image can also be accepted. But the decompressed image quality can not be promoted efficiently, so how to balance the image compression rate and image recovering quality is an important issue. In this paper, an image is transformed by discrete wavelet transform (DWT) to generate its DWT transformed image which can be compressed by the VQ method further. Besides, we compute the values between the DWT transformed image and decompressed DWT transformed image as the difference matrix which is the adjustable basis of the decompressed image quality. By controlling the deviation of the difference matrix, there can be nearly lossless compression for the VQ method. Experimental results show that when the number of compressed bits by our method is equal to the number of those bits compressed by the VQ method, the quality of our recovered image is better. Moreover, the proposed method has more compression capability comparing with the VQ scheme
Relation:	Journal of Electronic Science and Technology, V.11 N.1 : 51-57.
Appears in Collections:	[Department of Computer Science and Information Engineering] Journal Artical

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