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首页> 美国卫生研究院文献>Journal of Digital Imaging >Optimization of a contrast-detail-based method for electronic image display quality evaluation
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Optimization of a contrast-detail-based method for electronic image display quality evaluation

机译：基于对比度细节的电子图像显示质量评估方法的优化

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The authors previously reported a general technique based on contrast-detail methods to provide an overall quantitative evaluation of electronic image display quality. The figure-of-merit reflecting overall display quality is called maximum threshold contrast or MTC. In this work we have optimized the MTC technique through improvements in both the test images and the figure-of-merit computation. The test images were altered to match the average luminance with that observed for clinical computed radiographic images. The figure-of-merit calculation was altered to allow for contrast-detail data with slopes not equal to −1. Preliminary experiments also were conducted to demonstrate the response of the MTC measurements to increased noise in the displayed image. MTC measurements were obtained from five observers using the improved test images displayed with maximum monitor luminance settings of 30-, 50-, and 70-ft-Lamberts. Similar measurements were obtained from two observers using test images altered by the addition of a low level of image noise. The noise-free MTC and MTC difference measurements exhibited standard deviations of 0.77 and 1.55, respectively. This indicates good measurement precision, comparable or superior to that observed using the earlier MTC technique. No statistically significant image quality differences versus maximum monitor luminance were seen. The noise-added MTC measurements were greater than the noise-free values by an average of 4.08 pixel values, and this difference was statistically significant. This response is qualitatively correct, and is judged to indicate good sensitivity of the MTC measurement to increased noise levels.
机译：作者先前曾报道过一种基于对比度细节方法的通用技术，可提供对电子图像显示质量的整体定量评估。反映整体显示质量的品质因数称为最大阈值对比度或MTC。在这项工作中，我们通过改进测试图像和品质因数计算来优化MTC技术。改变测试图像以使平均亮度与临床计算的射线照相图像所观察到的平均亮度相匹配。更改了品质因数计算，以允许对比度细节数据的斜率不等于-1。还进行了初步实验，以演示MTC测量对显示图像中噪声增加的响应。使用改进的测试图像从五名观察者获得MTC测量值，这些测试图像显示的最大监视器亮度设置为30英尺，50英尺和70英尺朗伯特。使用添加了低水平图像噪声而改变的测试图像，从两名观察者获得了类似的测量值。无噪声的MTC和MTC差异测量分别显示出0.77和1.55的标准偏差。这表明良好的测量精度，与使用早期MTC技术所观察到的相当或更高。相对于最大监视器亮度，没有看到统计学上显着的图像质量差异。添加了噪声的MTC测量值比无噪声值平均多了4.08个像素值，并且此差异具有统计学意义。该响应在质量上是正确的，并被判断为表明MTC测量对增加的噪声水平具有良好的敏感性。

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