Enhancement of decompressed images by optimal shift-invariant wavelet packet basis

Dong Wei; Alan Conrad Bovik

doi:10.1117/12.234761

13 March 1996 Enhancement of decompressed images by optimal shift-invariant wavelet packet basis

Dong Wei, Alan Conrad Bovik

Proceedings Volume 2669, Still-Image Compression II; (1996) https://doi.org/10.1117/12.234761
Event: Electronic Imaging: Science and Technology, 1996, San Jose, CA, United States

Abstract

A new post-processing method based on wavelet thresholding is proposed to enhance transform coded images. At the encoder, the optimal (in the mean square error sense) shift- invariant wavelet packet basis is searched using a fast optimization algorithm and the location of the best basis in the entire shift-invariant wavelet packet tree is transmitted as overhead information with the bit stream to the decoder. After the decoder reconstructs the decompressed image, the post-processor performs thresholding using the optimal basis. This method can achieve comparable enhancement performance to the method using the undecimated discrete wavelet transform, and requires the same low post-processing complexity as the method using the orthonormal discrete wavelet transform.

Citation Download Citation

Dong Wei and Alan Conrad Bovik "Enhancement of decompressed images by optimal shift-invariant wavelet packet basis", Proc. SPIE 2669, Still-Image Compression II, (13 March 1996); https://doi.org/10.1117/12.234761

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