3.1.3 对比度均匀性 （Contrast Uniformity） 均匀的碘浓度在DSA影像中以均匀对比加以显示的性能。 3.1.4 感兴趣区 （ROI） 是指影像中特别感兴趣的局部区域.
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利用区域内部均匀性和区域间对比度这两个分割算法评价指标来对分割过后的图像进行定量的分析。
Uniformity of the use of intra-regional and inter-regional contrast of these two indicators to the image of the partition after the quantitative analysis.
在特征提取中，综合考虑了目标区域的对比度、面积、位置、轮廓、形状和亮度均匀性等特征量，建立了一种新的斑痕缺陷模型。
In feature extraction, a new "blemish" model is proposed, which takes several features into account, such as the contrast, area, location, outline, shape and the luminance uniformity of the object.
其中与光学特性测量有关的项目有：发光亮度、角度相关亮度均匀性、角度相关对比度、灰阶色度线性等。
Optical characteristics-related measurement projects in it include: shining luminance, angle-related luminance uniformity, angle-related contrast ratio, gray scale curve, etc.
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