在分析數(shù)字胃腸造影機DSI 序列圖象特性的基礎(chǔ)上，根據(jù)時域遞歸濾波原理，對非線性自適應(yīng)濾波器進行改進，便于工程實現(xiàn)。用簡化自適應(yīng)濾波算法確定濾波系數(shù)，設(shè)計和實現(xiàn)了DSI 序列圖象的動態(tài)降噪，并抑制了快變圖象的拖影，具有較好的動態(tài)跟蹤效果。實驗結(jié)果表明：圖象降噪效果顯著，提高了圖象的信噪比，滿足臨床要求。
關(guān)鍵詞：遞歸濾波；自適應(yīng)濾波；DSI 序列圖象；降噪
Abstract: The characteristics of DSI series image has been analyzed. According to the time-recursive filtering principle, the non-linear self-adaptive filter is improved for convenient engineering implementation consideration. Filtering coefficient is obtained by the simplified self-adaptive model and DSI image noise reducer is designed and implemented. The filter reduces the noises of slow-change pictures and restrains the tailing of moving pictures.
The dynamic tracking of image is very effective. The experimental results show that the signal noise ratio of image has been improved expectedly. The reducer can be widely used in clinic.
Key words: recursive filtering; self-adaptive filtering; DSI image series; noisy reducing