用Monte Carlo计算机模拟法探讨光子噪声对照相颗粒度的影响

本工作中,使用了一个概率型的计算机模型来模拟颗粒随机分布的照相乳剂层、曝光时颗粒中的潜影生成以及显影后的颗粒度测量。用统计回归分析的方法,对颗粒随机分布产生的照相颗粒度和乳剂层在可见光和单光子激活射线曝光以后产生的照相颗粒度进行了比较,最后得出这样的结论:在照相过程的每一个阶段,如果乳剂层中的每一个颗粒都独立地参与各种反应,与邻近颗粒不存在任何相关性的话,则光子噪声对照相颗粒度没有任何明显的影响。

A STUDY ON THE INFLUENCE OF PHOTON NOISE ON THE PHOTOGRAPHIC GRANULARITY BY A MONTE CARLO COMPUTER SIMULATION TECHNIQUE

In this paper a probabilistic model for computer simulation is used to simulate an emulsion layer in which the silver halfde grains are random distributed, the latent image formation in grains during exposure and granularity measurement for the emulsion layers as well. By means of a regression analysis approach, the comparisons between the granularities which arise from a random distribution of grains at different grain spatial densities and those of the emulsion layers after exposure to light or one-quantum-threshold radiation are made. It comes to the conclusion that if at each stage of the photographic process each grain in an emulsion layer is independently involved in various reactions concerned, i.e. there is no correlation between grains, there exist no detectable contribution of photon noise to the photographic granularity.