Refined Slanted-Edge Measurement from Practical Camera and Scanner Testing
Refined Slanted-Edge Measurement from Practical Camera and Scanner Testing
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发表时间：
2002
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通讯作者：
P. Burns;Don R. Williams
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作者：
P. Burns;Don R. Williams
自ISO采用倾斜边缘梯度分析测量数码相机图像分辨率的标准以来，已经过去了近五年的时间。该方法也已应用于胶片扫描仪、印刷品扫描仪和CRT显示器的空间频率响应和MTF。这些应用中的每一个都对该方法的使用提出了挑战。以前，我们已经根据涉及的各种信号处理步骤描述了偏差和变化误差的原因。这一分析与实际系统测试的观察结果相结合，提出了改进和对结果的解释。具体地说，将讨论信号编码问题的数据筛选、边缘特征定位和斜率估计以及噪声恢复能力方面的改进。
It has been almost five years since the ISO adopted a standard for measurement of image resolution of digital still cameras using slanted-edge gradient analysis. The method has also been applied to the spatial frequency response and MTF of film and print scanners, and CRT displays. Each of these applications presents challenges to the use of the method. Previously, we have described causes of both bias and variation error in terms of the various signal processing steps involved. This analysis, when combined with observations from practical systems testing, has suggested improvements and interpretation of results. Specifically, refinements in data screening for signal encoding problems, edge feature location and slope estimation, and noise resilience will be addressed.