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Measurement of the modulation transfer function of paper

机译：纸张调制传递函数的测量

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In recent years there has been a renewed interest in modeling the halftone microstructure to better control the colors produced in a halftone image. Diffusion of light within the paper has a significant effect on the halftone color; this effect is known as optical dot gain or the Yule-Neilsen effect. Because of diffusion, a photon may exit the paper from a different region of the halftone microstructure than that into which it entered the paper. To account rigorously for this effect requires knowledge of the paper's point-spread function or, equivalently, the paper's modulation transfer function (MTF). A new technique for measuring the MTF of paper-the series-expansion bar-target technique-is introduced. The method uses a bar target, but the analysis more closely resembles that of the edge-gradient technique. In the series-expansion method, bar-target image data are expanded into a Fourier series, and the paper's MTF is given by the series-expansion coefficients. It differs from the typical bar-target analysis in that the typical method plots the amplitude of the fundamental frequency component for several targets of varying frequency, whereas the series-expansion method plots the amplitude of the fundamental and its harmonics for a single target. Two possible techniques for measuring the MTF with the bar-target series-expansion method are considered. In the first, the image of the bar target is projected onto the paper, and in the second, the bar target is placed directly on the paper, in close contact. (C) 1998 Optical Society of America OCIS codes: 100.0100, 100.2810, 110.4100. [References: 15]
机译：近年来，对半色调微结构建模以更好地控制在半色调图像中产生的颜色有了新的兴趣。纸张内的光扩散对半色调颜色有显着影响。这种效应称为光学点增益或Yule-Neilsen效应。由于扩散，光子可能会从半色调微结构的不同于其进入纸张的区域的不同区域离开纸张。要严格考虑这种影响，需要了解纸张的点扩展函数，或者等效地，需要了解纸张的调制传递函数（MTF）。介绍了一种测量纸的MTF的新技术—系列扩展条形目标技术。该方法使用条形目标，但分析与边缘渐变技术更相似。在级数展开法中，将条形目标图像数据展开为傅立叶级数，并通过级数展开系数给出论文的MTF。它与典型的条形目标分析的不同之处在于，典型方法绘制了多个频率变化的目标的基本频率分量的幅度，而级数展开方法绘制了单个目标的基本频率及其谐波的幅度。考虑了使用条形目标系列扩展方法测量MTF的两种可能的技术。首先，将条形目标的图像投影到纸张上，然后，将条形目标直接紧密地放置在纸上。 （C）1998年美国光学学会OCIS代码：100.0100、100.2810、110.4100。 [参考：15]

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