一種改進(jìn)的自適應(yīng)小波變換

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摘 要： 本文針對自適應(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)符號為負(fù)，可以看作前期預(yù)測過程，第二層為更新層，第三層為自適應(yīng)預(yù)測層。在自適應(yīng)預(yù)測層中，圖像平滑處采用對稱濾波器，而圖像邊沿和躍升邊沿兩側(cè)采用不對稱預(yù)測器進(jìn)行預(yù)測，以避免較大預(yù)測誤差產(chǎn)生。

關(guān)鍵詞： 小波變換，提升方案，自適應(yīng)，邊沿檢測

參考文獻(xiàn)
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