非均匀照明场中参考格栅信号提取的研究

Study on Reference Grid Extracting from Ununiformity Illumination Field

本文对非均匀照明场中参考格栅图像作了统计分析 ,在此基础上提出了一种格栅信号提取方案。该方案利用图像中像素点邻域的灰度均值和均方差值的统计特性 ,把原始图像分割为一系列子图像 ,对每一个子图像进行自适应阈值分割 ,进而获得原始图像中的参考格栅信号。实验确定了各子图像临界阈值与图像灰度均值的关系 ,并与LoG算子的结果进行了对比 ,该方法明显较优。

A statistical analysis on a reference grid image in a ununiformity illumination field is proposed. On that basis a grid signal extraction project is presented. The deviated value on the around zone for each pixel, several subsidiary image are got from the original image, they are segmented by the threshold value of auto-adaptive, and then obtained the reference grid image of the original image upon this knowledge. The relation between the threshold value and the mean gray level is given by experimental result. The result of this strategy is fine obviously through comparing with the result of LOG edge detected method.