五邑大学学报：自然科学版
五邑大學學報：自然科學版
오읍대학학보：자연과학판
Journal of Wuyi University(Natural Science Edition)
2012年
1期
43-48
,共6页
自适应块阈值%平移不变性%图像去噪
自適應塊閾值%平移不變性%圖像去譟
자괄응괴역치%평이불변성%도상거조
adaptive block threshold%translation invariant%image denoising
为有效抑制图像阈值去噪产生的伪吉布斯现象，提出了平移不变自适应块阈值图像去噪算法（ABTTI）．即，首先在小波域中将小波系数分成子块，然后利用块平移不变性、块阚值自适应性，并采用本文提出的基于子块能量的自适应阈值方法计算分块阈值．利用3种经典测试图像。与软阈值、块阅值等算法进行对比，结果证明ABTTI算法不仅具有好的去伪影性能，而且可以获得更高的峰值信噪比和计算效率．
為有效抑製圖像閾值去譟產生的偽吉佈斯現象，提齣瞭平移不變自適應塊閾值圖像去譟算法（ABTTI）．即，首先在小波域中將小波繫數分成子塊，然後利用塊平移不變性、塊闞值自適應性，併採用本文提齣的基于子塊能量的自適應閾值方法計算分塊閾值．利用3種經典測試圖像。與軟閾值、塊閱值等算法進行對比，結果證明ABTTI算法不僅具有好的去偽影性能，而且可以穫得更高的峰值信譟比和計算效率．
위유효억제도상역치거조산생적위길포사현상，제출료평이불변자괄응괴역치도상거조산법（ABTTI）．즉，수선재소파역중장소파계수분성자괴，연후이용괴평이불변성、괴감치자괄응성，병채용본문제출적기우자괴능량적자괄응역치방법계산분괴역치．이용3충경전측시도상。여연역치、괴열치등산법진행대비，결과증명ABTTI산법불부구유호적거위영성능，이차가이획득경고적봉치신조비화계산효솔．
An Adaptive Block Threshold based on the Translation Invariance （ABTTI） algorithm is proposed for suppressing the pseudo Gibbs phenomenon of denoising effectively. In the wavelet domain, the wavelet coefficients are subdivided into sub-blocks, and then our proposed adaptive threshold method, which is based on sub-block energy, is used to compute every sub-block threshold using the block translation variance and the block threshold adaptability. The ABTTI is compared with other denoising methods, such as Soft Threshold and Block Threshold. Simulation results show that ABTTI not only has good performance in eliminating artifacts but also can achieve higher PSNR and computing efficiency.
