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1. 发明授权

US09025897B1 Methods and apparatus for adaptive auto image binarization 有权
标题翻译：自适应自动二值化方法与装置
公开(公告)号：US09025897B1
公开(公告)日：2015-05-05
申请号：US13857605
申请日：2013-04-05
申请人： John H Elton , Stephen A Martucci
发明人： John H Elton , Stephen A Martucci
IPC分类号： G06K9/00 , G06K9/36 , G06K9/46 , G06T5/00
CPC分类号： G06T7/11 , G06T7/136
摘要： Bi-level pixel values are generated from a set of input pixel values corresponding to an image. Various described methods and apparatus are well suited for applications with limited computational capability and/or limited available resources to be used for performing image processing. Corresponding to an individual input pixel being processed, a plurality of windows including the pixel are evaluated to determine statistics including a variance for each window. Based upon the determined variances, one of a plurality of binarization threshold generation functions is selected. A binarization threshold for the input pixel is determined using the selected binarization threshold generation function. A bi-level pixel value is generated based on a comparison of the input pixel value to the generated binarization threshold. In various embodiments, the binarization threshold determination functions use non-zero integer powers of one or more variances, and intentionally avoid performing a square root operation, thus limiting computational complexity.
摘要翻译：从对应于图像的一组输入像素值生成双像素值。各种描述的方法和装置非常适合于具有有限的计算能力和/或用于执行图像处理的有限的可用资源的应用。对应于正在处理的单个输入像素，评估包括像素的多个窗口以确定包括每个窗口的方差的统计信息。基于确定的方差，选择多个二值化阈值生成函数中的一个。使用所选择的二值化阈值生成函数来确定输入像素的二值化阈值。基于输入像素值与生成的二值化阈值的比较来生成双电平像素值。在各种实施例中，二值化阈值确定功能使用一个或多个方差的非零整数幂，并且有意地避免执行平方根操作，从而限制计算复杂度。

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