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一种亚像素精度的边缘检测方法

Keywords: 边缘检测,最小二乘拟合,亚像素,贝塞尔

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Abstract:

提出了一种基于贝塞尔边缘模型的亚像素边缘检测算法.该算法首先在原有的贝塞尔点扩散函数中引入修正参数t,并与理想边缘模型卷积,获得可修正的贝塞尔边缘灰度模型;然后,利用图像边缘的信息对该模型进行最小二乘拟合,在拟合过程中,通过修正参数t对边缘模型进行修正,最终获得精确的边缘模型,同时考虑数字采样等因素对灰度分布的影响,得到图像边缘的亚像素位置.实验中测得边缘亚像素位置的平均误差为一个像素的3%,其中误差方差为0.0005.结果表明:本算法基本满足图像测量的稳定可靠、精度高等要求,并且对图像噪声有较强的鲁棒性.

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