The sampling method by coupling criticality source direction biasing and the exponential transform is established for duct shielding calculation.

建立临界源方向偏倚和指数变换相结合的耦合抽样方法，用于反应堆孔道的屏蔽计算。

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Fig. 1 Original infrared image (top), results of non-linear gray value transform (exponential transform) (middle), results of fragment linear gray value transform (bottom).

图1上部是原始红外图像，中部是非线性灰度(指数变换)变换结果，下部是分段线性变换结果。

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