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。