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1. 发明授权

US5164993A Method and apparatus for automatic tonescale generation in digital radiographic images 失效
标题翻译：用于数字放射照相图像中自动色阶产生的方法和装置
公开(公告)号：US5164993A
公开(公告)日：1992-11-17
申请号：US797615
申请日：1991-11-25
申请人： John R. Capozzi , Ralph Schaetzing
发明人： John R. Capozzi , Ralph Schaetzing
IPC分类号： A61B6/00 , G06T1/00 , G06T5/00 , G06T5/40 , H04N1/407
CPC分类号： G06T5/008 , G06T5/40 , G06T2207/10116 , G06T2207/20144 , Y10S378/901
摘要： A method and apparatus for automatically and adaptively generating tonescale transformation functions that are robust with respect to imaging systems, exposure conditions, and body parts. The technique uses the histogram of the digital input image, the cumulative distribution function of the histogram, and the entropy of subsections of the histogram to create the final tonescale transformation. Using these three functions, the histogram can be divided into a region of interest, a low-signal foreground region, and a high-signal background region. The tonescale is constructed to be substantially linear over the region of interest, joining smoothly with a nonlinear portion extending from the end of the low-signal foreground region to the start of the region of interest, and another nonlinear portion of the high-signal background region. The substantially linear region of interest and the entire image are subject to certain output density constraints to optimize the diagnostic utility of the final image. The technique depends entirely on the histogram of the input image, and, hence, it is adaptive and robust.
摘要翻译：一种用于自动和自适应地生成相对于成像系统，曝光条件和身体部分是鲁棒的色阶变换函数的方法和装置。该技术使用数字输入图像的直方图，直方图的累积分布函数和直方图的子部分的熵来创建最终色阶变换。使用这三个函数，直方图可以分为感兴趣区域，低信号前景区域和高信号背景区域。色阶被构造为在感兴趣区域上基本上是线性的，与从低信号前景区域的末端延伸到感兴趣区域的开始处的非线性部分平滑地连接，并且高信号背景的另一个非线性部分地区。基本线性的感兴趣区域和整个图像受到某些输出密度约束，以优化最终图像的诊断效用。该技术完全取决于输入图像的直方图，因此，它是自适应和鲁棒的。

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