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本文叙述了一种利用胶片非线性特性和正负片互补条件实现图象密度切片的新方法,提出了特性曲线的数学模型,讨论了密度切片反衬,γ和曝光量之间的关系,介绍了实验结果,方法的优点是使用非相干光,设备十分简便。A new method for level slicing operation of optical images, utilizing the nonlinear characteristics of photographic film and the complementary properties of the positive-negative is described. The mathematical model of the characteristics curve is proposed, and the relation between the contrast of level slicing, the γ value and the exposure is discussed. The experimental results are presented. The advantage of this method is that it employs noncoherent source and is very simple.
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