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Digital Image Processing
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Adaptive Vector Qualification Coding on Wavelet Information for data Compression
(a) Original Image
(b)Compressed image
Fig.3 JERS-1 image
(a) Original Image
(b) Comprssed image
Fig.4 TM image from Land sat
(a) Original image
(b) Compressed image
Fig.5 Lena image
Conslusion
The result from porposed method has been shown an important improvement in image fidelity or image quality. Since an image can compose of the edges with different gradient directions. Therefore, the a.c. energy from the corresponding edges is unpredictable. The method of fixed pattern of bit rate always can not match with the high a.c. energy information. Unlike the proposed method, the high a.c. energy subband image has been sorted before encoding it with higher bit rate. The mean square error from the compreesed image is then reduced as shown in the table 1.
Acknowledgement
The authors would like to thank the National Research Council of Thailand (NRCT) for provding the satellite images and Mr. Suchati nuchpitak for proving the manuscript.
Mr. Suchati is with the Department lf languages and Social Science, Faculty, Faculty of Industrial Education, King Mongkut's Institute of Technology Ladkraband, Bangkok, Thainand.
Reference
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S.Kondo, "Wavelet transform and its application to image processing." Proceedings of the RE-STESS '96, pp. S-6-s-11, Bangkok Thailand 1996.
- N.M. Nasrabadi and R.A. King, "Image coding using vector quantization: A Review," IEEE Tran. An Comm. Vol. Com-25 No. 11, pp 128501292, Nov. 1977.
- W.H. Chen and C.H. Smith, "Adaptive coding of monochrome and color images," IEEE Trans. An Comm. Vol. Com-25 No. 11, pp 1285-1292, Nov. 1977.
- M. Antonini, M. Barland, P. Matieu and Daubechies, "Image coding using wavelet transform," IEEE Trans. An Image Proc., vol. 1, pp. 205-220, April 1992.
- S. Wongkharn, M. Chongchewchamnan, K.Kittayaruasiriwat, F. Chevasuvit and K. Dejhan, "Satellite image data compression using Vector quantization on Wavelet transrom "Proc. Of the 18th acrs, pp.-1-18 -1-8-6, Oct. 1997.
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