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    • 9. 发明授权
    • Method for the temporal filtering of the noise in an image of a sequence
of digital images, and device for carrying out the method
    • 用于对数字图像序列的图像中的噪声进行时间滤波的方法以及用于执行该方法的装置
    • US5911012A
    • 1999-06-08
    • US674061
    • 1996-07-01
    • Franck BernardRaoul Florent
    • Franck BernardRaoul Florent
    • G06T5/20G06T5/00G06K9/40
    • G06T5/002G06T5/50G06T2207/10016G06T2207/10121G06T2207/20182G06T2207/30004
    • A method for the temporal filtering of a sequence of digitized noisy images includes the evaluation of an anti-causal filtered sample (P.sub.t.sup.A) in order to reconstruct a present noisy sample (I.sub.t.sup.P) of a given pixel in a present image by an anti-causal linear combination of a causal filtered sample (P.sub.t.sup.C) obtained by preliminary causal linear temporal filtering in association with coefficients (b.sub.j.sup.C) and an anti-causal noisy sample (I.sub.t+1.sup.A). To the samples (P.sub.t.sup.C, I.sub.t+1.sup.A) there are assigned weights calculated as functions of a causal gain factor (K.sub.t.sup.C), equal to the inverse of the sum of the coefficients of the causal linear filtering, and an anti-causal continuity coefficient (.alpha..sub.t.sup.A), the weight of the anti-causal sample (I.sub.t+1.sup.A) being equal to the probability of intensity continuity between the anti-causal sample (I.sub.t+1.sup.A) and a previous filtered sample (P.sub.t.sup.C, P.sub.t-1.sup.C) in the sequence. A device for carrying out the method is configured for calculating the anti-causal linear combination.
    • 用于时间过滤数字化噪声图像序列的方法包括反因果滤波样本(PtA)的评估,以便通过反因果重建当前图像中给定像素的当前噪声样本(ItP) 通过与系数(bjC)和反因果嘈杂样本(It + 1A)相关联的初步因果线性时间滤波获得的因果滤波样本(PtC)的线性组合。 对于样本(PtC,It + 1A),分配的权重作为因果增益因子(KtC)的函数计算,等于因果线性滤波的系数之和的倒数和反因果连续性系数 αtA),抗因子样品(It + 1A)的重量等于抗因子样品(It + 1A)与先前经过过滤的样品(PtC,Pt-1C)之间的强度连续性概率 序列。 用于执行该方法的装置被配置用于计算反因果线性组合。