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1. 发明申请

US20060291742A1 Method and apparatus for enhancing image acquired by radiographic system 有权
标题翻译：用于增强由放射摄影系统获取的图像的方法和装置
公开(公告)号：US20060291742A1
公开(公告)日：2006-12-28
申请号：US11472193
申请日：2006-06-21
申请人： Li Zhang , Zhiqiang Chen , Yuxiang Xing , Yuanjing Li , Yinong Liu , Ziran Zhao , Yongshun Xiao
发明人： Li Zhang , Zhiqiang Chen , Yuxiang Xing , Yuanjing Li , Yinong Liu , Ziran Zhao , Yongshun Xiao
IPC分类号： G06K9/40 , G06K9/00
CPC分类号： G06T5/40 , G06T5/009 , G06T2207/10116 , G06T2207/30004
摘要： A method of image information enhancement in radiography relates to image information processing techniques in radiography. The method comprising steps of: normalizing an acquired image A(x,y) to form a normalized image B(x,y); filtering the normalized image B(x,y) by a low-pass filter to obtain an filtered image C(x,y); calculating a relative standard deviation for each pixel in the image A(x,y), three times the relative standard deviation being an edge threshold for each pixel; thresholding a difference image obtained by subtracting the filtered image C(x,y) from the normalized image B(x,y) by using the edge threshold for each pixel to form a threshold-processed image D(x,y); enhancing a contrast of the threshold-processed image D(x,y) by using a non-linear function to form a contrast-enhanced image E(x,y); determining a enhancement coefficient a(x,y); obtaining a edge-enhanced image F(x,y) by multiplying the enhancement coefficient a(x,y), the contrast-enhanced image E(x,y) and the filtered image C(x,y); and generating a resulting image by multiplying a sum of the edge-enhanced image F(x,y) and the filtered image C(x,y) with the maximum value Amax As compared with the prior arts, the inventive method has a fast processing speed for image information enhancement and a simple algorithm, images clearly, eliminates noises in the images, and satisfies the requirements of relatively more enhancement to the contrast of the dark regions in the scanned images.
摘要翻译：射线照相术中图像信息增强的方法涉及放射照相术中的图像信息处理技术。该方法包括以下步骤：归一化所获取的图像A（x，y）以形成归一化图像B（x，y）; 通过低通滤波器对归一化图像B（x，y）进行滤波，得到滤波图像C（x，y）; 计算图像A（x，y）中每个像素的相对标准偏差，相对标准偏差的三倍是每个像素的边缘阈值; 通过使用每个像素的边缘阈值来从归一化图像B（x，y）中减去滤波图像C（x，y）获得的差分图像，以形成阈值处理图像D（x，y）; 通过使用非线性函数来增强阈值处理图像D（x，y）的对比度，以形成对比度增强图像E（x，y）; 确定增强系数a（x，y）; 通过将增强系数a（x，y），对比度增强图像E（x，y）和滤波图像C（x，y）相乘来获得边缘增强图像F（x，y）并且通过将边缘增强图像F（x，y）和滤波图像C（x，y）的和乘以最大值A最大值来产生所得到的图像。与现有技术相比，本发明的方法具有图像信息增强的快速处理速度和简单的算法，图像清晰，消除了图像中的噪声，并且满足了对扫描图像中的暗区域的对比度相对更加增强的要求。

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