New Method of Describing and Measuring the Granularity of Photographic Materials
New Method of Describing and Measuring the Granularity of Photographic Materials
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描述和测量感光材料粒度的新方法
DOI：
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发表时间：
1955
期刊：
影响因子：
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通讯作者：
R. Jones
中科院分区：
文献类型：
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作者：
R. Jones
本文的论点是，用胶片噪声谱来描述感光材料的粒度是唯一完全合适的方法。胶片噪声谱与粒度的关系与(电路理论的)功率谱与电噪声的关系相同。胶片噪声频谱包括先前粒度测量中的所有信息，并且很容易使它们相互关联。它超越了以前的方法，因为它导致了与检测照相材料上的目标图像有关的许多信噪比问题的解决。胶片噪声频谱在第二部分和第三部分中定义和讨论。它与涉及粒度系数的旧方法的关系是第四部分的主题。新方法的优越性在第五部分中详细说明。第六部分使用胶片噪声频谱来推导普通粒度和合成粒度之间的关系。第七部分讨论胶片的光电扫描，并推导出信号和噪声的一般表达式。这些表达式在第8部分和第9部分中使用，以推导出一种特别方便的测量胶片噪声频谱的方法，并解决在目标图像检测中最大化信噪比的一般问题。第十部分讨论了Super-XX胶片的胶片噪声谱。
The thesis of this paper is that the only fully adequate way to describe the granularity of photographic materials is by means of a film noise spectrum. The film noise spectrum bears the same relation to granularity that the power spectrum (of electrical circuit theory) bears to electrical noise. The film noise spectrum includes all of the information in the previous granularity measures and readily interrelates them. It goes beyond the previous measures in that it leads to the solution of many of the signal-to-noise problems that arise in connection with the detection of target images on photographic materials.The film noise spectrum is defined and discussed in Parts 2 and 3. Its relation to the older methods of description involving granularity coefficients, both ordinary and syzygetic, is the subject of Part 4. The superiority of the new method is explained in detail in Part 5. Part 6 employs the film noise spectrum to derive the relation between ordinary granularity and syzygetic granularity. Part 7 discusses photoelectric scanning of the film and derives general expressions for the signal and for the noise. These expressions are used in Parts 8 and 9 to derive a particularly convenient method for the measurement of the film noise spectrum, and to solve the general problem of maximizing the signal-to-noise ratio in the detection of target images. Part 10 discusses the film noise spectrum of Super-XX film.