一種改進(jìn)的自適應(yīng)小波變換

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摘 要： 本文針對(duì)自適應(yīng)小波提升方案的要求，在通常的兩層提升方案基礎(chǔ)上提出了三層小波提升方案。其中第一層系數(shù)符號(hào)為負(fù)，可以看作前期預(yù)測(cè)過(guò)程，第二層為更新層，第三層為自適應(yīng)預(yù)測(cè)層。在自適應(yīng)預(yù)測(cè)層中，圖像平滑處采用對(duì)稱濾波器，而圖像邊沿和躍升邊沿兩側(cè)采用不對(duì)稱預(yù)測(cè)器進(jìn)行預(yù)測(cè)，以避免較大預(yù)測(cè)誤差產(chǎn)生。

關(guān)鍵詞： 小波變換，提升方案，自適應(yīng)，邊沿檢測(cè)

參考文獻(xiàn)
[1] I. Daubechies, Wim Sweldens. Factoring wavelet transforms into lifting steps. J. Fourier Anal., 4(3):245-267
[2] R. Claypoole and G. Davis. Nonlinear wavelet transforms for image coding via lifting, IEEE Transactions on Image Processing,
[3] Gabrel Fernandez, Senthil Periaswamy and Wim Sweldens. LIFTPACK: a software package for wavelet transforms using lifting, Proc. SPIE 2825, Wavelet Applications in Signal and Image Processing,(4): 396-408
[4] Roger L. Claypoole, Jr. and Richard G. Baraniuk. Flexible Wavelet Transforms Using Lifting, Proceedings of the 68th SEG Meeting, New Orleans, Louisiana, USA,