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二维直方图准分的Renyi熵快速图像阈值分割

, PP. 411-418

Keywords: 图像分割,阈值法,二维Renyi熵,递推算法,准分法

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Abstract:

针对传统二维Renyi熵(RE)分割法分割结果不够准确和计算复杂度高的问题,提出一种快速的二维RE准分法。首先,用与主对角线平行的四条斜线将直方图分成内点区、边界点区和噪声点区,并对噪声点区进行去噪处理以便获得更好的分割性能。然后,对内点区与边界点区在RE公式中的对应量准确取值使阈值选取更准确。最后,提出二维RE准分法的一般递推算法,并在此算法的基础上利用RE在二维直方图上的计算特性和两个公式导出快速的二维RE阈值选取算法来降低计算复杂度。实验结果表明,与对比方法相比,文中方法不仅分割更准确和抗噪性更强,而且其运行时间少,与二维RE斜分法运行时间相近。

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